3
3.0
Jun 30, 2018
06/18
by
S. Lacour; F. Eisenhauer; S. Gillessen; O. Pfuhl; Y. Kok; G. Perrin; K. Rousselet-Perraut; C. Straubmeier; W. Brandner; A. Amorim; J. Woillez; H. Bonnet
texts
eye 3
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GRAVITY is a new generation beam combination instrument for the VLTI. Its goal is to achieve microarsecond astrometric accuracy between objects separated by a few arcsec. This $10^6$ accuracy on astrometric measurements is the most important challenge of the instrument, and careful error budget have been paramount during the technical design of the instrument. In this poster, we will focus on baselines induced errors, which is part of a larger error budget.
Topics: Instrumentation and Methods for Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1407.4281
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45
Sep 21, 2013
09/13
by
C. Thalmann; M. Janson; E. Buenzli; T. D. Brandt; J. P. Wisniewski; C. Dominik; J. Carson; M. W. McElwain; T. Currie; G. R. Knapp; A. Moro-Martín; T. Usuda; L. Abe; W. Brandner; S. Egner; M. Feldt; T. Golota; M. Goto; O. Guyon; J. Hashimoto; Y. Hayano; M. Hayashi; S. Hayashi; T. Henning; K. W. Hodapp; M. Ishii; M. Iye; R. Kandori; T. Kudo; N. Kusakabe; M. Kuzuhara; J. Kwon; T. Matsuo; S. Mayama; S. Miyama; J. -I. Morino; T. Nishimura; T. -S. Pyo; E. Serabyn; H. Suto; R. Suzuki; M. Takami; N. Takato; H. Terada; D. Tomono; E. L. Turner; M. Watanabe; T. Yamada; H. Takami; M. Tamura
texts
eye 45
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We present Subaru/HiCIAO H-band high-contrast images of the debris disk around HIP 79977, whose pres- ence was recently inferred from an infrared excess. Our images resolve the disk for the first time, allowing characterization of its shape, size, and dust grain properties. We use angular differential imaging (ADI) to reveal the disk geometry in unpolarized light out to a radius of ~2", as well as polarized differential imaging (PDI) to measure the degree of scattering polarization out to...
Source: http://arxiv.org/abs/1301.0625v1
3
3.0
Jun 30, 2018
06/18
by
J. E. Schlieder; M. Bonnefoy; T. M. Herbst; S. Lepine; E. Berger; Th. Henning; A. Skemer; G. Chauvin; E. Rice; B. Biller; J. H. V. Girard; A. M. Lagrange; P. Hinz; D. Defrere; C. Bergfors; W. Brandner; S. Lacour; M. Skrutskie; J. Leisenring
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eye 3
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We report the confirmation of the binary nature of the nearby, very low-mass system NLTT 33370 with adaptive optics imaging and present resolved near-infrared photometry and integrated light optical and near-infrared spectroscopy to characterize the system. VLT-NaCo and LBTI-LMIRCam images show significant orbital motion between 2013 February and 2013 April. Optical spectra reveal weak, gravity sensitive alkali lines and strong lithium 6708 Angstrom absorption that indicate the system is...
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1401.0947
3
3.0
Jun 30, 2018
06/18
by
N. Blind; H. Huber; F. Eisenhauer; J. Weber; S. Gillessen; M. Lippa; L. Burtscher; O. Hans; M. Haug; F. Haussmann; S. Huber; A. Janssen; S. Kellner; Y. Kok; T. Ott; O. Pfuhl; E. Sturm; E. Wieprecht; A. Amorim; W. Brandner; G. Perrin; K. Perraut; C. Straubmeier
texts
eye 3
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GRAVITY is the second generation VLT Interferometer (VLTI) instrument for high-precision narrow-angle astrometry and phase-referenced interferometric imaging. The laser metrology system of GRAVITY is at the heart of its astrometric mode, which must measure the distance of 2 stars with a precision of 10 micro-arcseconds. This means the metrology has to measure the optical path difference between the two beam combiners of GRAVITY to a level of 5 nm. The metrology design presents some non-common...
Topics: Instrumentation and Methods for Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1407.6669
3
3.0
Jun 30, 2018
06/18
by
T. Paumard; O. Pfuhl; F. Martins; P. Kervella; T. Ott; J. -U. Pott; J. B. Le Bouquin; J. Breitfelder; S. Gillessen; G. Perrin; L. Burtscher; X. Haubois; W. Brandner
texts
eye 3
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The stellar population in the central parsec of the Galaxy is dominated by an old (several Gyr) population, but young, massive stars dominate the luminosity function. We have studied the most luminous of these stars, GCIRS 7, in order to constrain the age of the recent star formation event in the Galactic Centre and to characterise it as an interferometric reference for observations of the Galactic Centre with the instrument GRAVITY, which will equip the Very Large Telescope Interferometer in...
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1406.5320
2
2.0
Jun 29, 2018
06/18
by
K. G. Hełminiak; M. Kuzuhara; K. Mede; T. D. Brandt; R. Kandori; T. Suenaga; N. Kusakabe; N. Narita; J. C. Carson; T. Currie; T. Kudo; J. Hashimoto; L. Abe; E. Akiyama; W. Brandner; M. Feldt; M. Goto; C. A. Grady; O. Guyon; Y. Hayano; M. Hayashi; S. S. Hayashi; T. Henning; K. W. Hodapp; M. Ishii; M. Iye; M. Janson; G. R. Knapp; J. Kwon; T. Matsuo; M. W. McElwain; S. Miyama; J. -I. Morino; A. Moro-Martin; T. Nishimura; T. Ryu; T. -S. Pyo; E. Serabyn; H. Suto; R. Suzuki; Y. H. Takahashi; M. Takami; N. Takato; H. Terada; C. Thalmann; E. L. Turner; M. Watanabe; J. Wisniewski; T. Yamada; H. Takami; T. Usuda; M. Tamura
texts
eye 2
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We report the direct imaging detection of a low-mass companion to a young, moderately active star V450 And, that was previously identified with the radial velocity method. The companion was found in high-contrast images obtained with the Subaru Telescope equipped with the HiCIAO camera and AO188 adaptive optics system. From the public ELODIE and SOPHIE archives we extracted available high-resolution spectra and radial velocity (RV) measurements, along with RVs from the Lick planet search...
Topics: Earth and Planetary Astrophysics, Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1608.08703
4
4.0
Jun 30, 2018
06/18
by
A. -L. Maire; A. J. Skemer; P. M. Hinz; S. Desidera; S. Esposito; R. Gratton; F. Marzari; M. F. Skrutskie; B. A. Biller; D. Defrère; V. P. Bailey; J. M. Leisenring; D. Apai; M. Bonnefoy; W. Brandner; E. Buenzli; R. U. Claudi; L. M. Close; J. R. Crepp; R. J. De Rosa; J. A. Eisner; J. J. Fortney; T. Henning; K. -H. Hofmann; T. G. Kopytova; J. R. Males; D. Mesa; K. M. Morzinski; A. Oza; J. Patience; E. Pinna; A. Rajan; D. Schertl; J. E. Schlieder; K. Y. L. Su; A. Vaz; K. Ward-Duong; G. Weigelt; C. E. Woodward
texts
eye 4
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Context. Astrometric monitoring of directly-imaged exoplanets allows the study of their orbital parameters and system architectures. Because most directly-imaged planets have long orbital periods (>20 AU), accurate astrometry is challenging when based on data acquired on timescales of a few years and usually with different instruments. The LMIRCam camera on the LBT is being used for the LEECH survey to search for and characterize young and adolescent exoplanets in L' band, including their...
Topics: Earth and Planetary Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1412.6989
49
49
Sep 19, 2013
09/13
by
Y. -H. Chu; B. C. Dunne; R. A. Gruendl; W. Brandner
texts
eye 49
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Current searches for extrasolar planets have concentrated on observing the reflex Doppler shift of solar-type stars. Little is known, however, about planetary systems around non-solar-type stars. We suggest a new method to extend planetary searches to hot white dwarfs. Near a hot white dwarf, the atmosphere of a Jovian planet will be photoionized and emit hydrogen recombination lines, which may be detected by high- dispersion spectroscopic observations. Multi-epoch monitoring can be used to...
Source: http://arxiv.org/abs/astro-ph/0010469v1
41
41
Sep 21, 2009
09/09
by
*Credit:* D. Padgett (IPAC/Caltech), W. Brandner (IPAC), K. Stapelfeldt (JPL) and NASA [ http://www.nasa.gov/ ]
image
eye 41
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*Description*: This image shows a newborn binary star system, CoKu Tau/1, lying at the center of four "wings" of light extending as much as 75 billion miles from the pair. The "wings" outline the edges of a region in the stars' dusty surroundings, which have been cleared by outflowing gas. A thin, dark lane extends to the left and to right of the binary, suggesting that a disk or ring of dusty material encircles the two young stars. Technical facts about this news release:...
Topics: CoKu Tau/1, What -- Earth, What -- Sun
Source: http://hubblesite.org/newscenter/archive/releases/1999/05/image/d/
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34
Sep 21, 2009
09/09
by
*Image Credit:* NASA [ http://www.nasa.gov/ ]; Rodger Thompson, Marcia Rieke, Glenn Schneider, Susan Stolovy (University of Arizona); K.L. Luhman (Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.); Edwin Erickson (SETI Institute/Ames Research Center); D. Padgett (IPAC/Caltech), W. Brandner (IPAC), K. Stapelfeldt (JPL); The NICMOS Group (STScI [ http://www.stsci.edu/ ], ESA [ http://www.spacetelescope.org/ ]) and The NICMOS Science Team (Univ. of Arizona)
image
eye 34
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*Description*: NICMOS uses its near-infrared vision to probe dark, dusty, never-before-seen regions of space with the optical clarity that only Hubble can provide. A sample of images taken with NICMOS are (from top left to bottom right): over 50 newly born brown dwarfs in the Orion Nebula's Trapezium cluster; a twin pair of narrow bullet-shaped "jets" of gas and dust blasted into space by a dying star embedded within the Egg Nebula; violent star birth in Orion's giant molecular cloud...
Topics: What -- NICMOS, What -- Near Infrared Camera and Multi-Object Spectrometer (NICMOS), What -- Hubble...
Source: http://hubblesite.org/newscenter/archive/releases/2003/33/image/a/
38
38
Sep 21, 2009
09/09
by
*Credit:* D. Padgett (IPAC/Caltech), W. Brandner (IPAC), K. Stapelfeldt (JPL) and NASA [ http://www.nasa.gov/ ]
image
eye 38
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*Description*: I04248 - In this image of IRAS 04248+2612, the infrared eyes of NICMOS peer through a dusty cloud to reveal a double-star system in formation. A nebula extends at least 65 billion miles in opposite directions from the twin stars, and is illuminated by them. This nebula was formed from material ejected by the young star system. The apparent "pinching" of this nebula close to the binary suggests that a ring or disk of dust and gas surrounds the two stars. Technical facts...
Topics: IRAS 04248+2612, I04248, What -- Infrared Astronomical Satellite (IRAS), What -- NICMOS, What --...
Source: http://hubblesite.org/newscenter/archive/releases/1999/05/image/p/
3
3.0
Jun 30, 2018
06/18
by
Timothy D. Brandt; Michael W. McElwain; Edwin L. Turner; Kyle Mede; David S. Spiegel; Masayuki Kuzuhara; Joshua E. Schlieder; John P. Wisniewski; L. Abe; B. Biller; W. Brandner; J. Carson; T. Currie; S. Egner; M. Feldt; T. Golota; M. Goto; C. A. Grady; O. Guyon; J. Hashimoto; Y. Hayano; M. Hayashi; S. Hayashi; T. Henning; K. W. Hodapp; S. Inutsuka; M. Ishii; M. Iye; M. Janson; R. Kandori; G. R. Knapp; T. Kudo; N. Kusakabe; J. Kwon; T. Matsuo; S. Miyama; J. -I. Morino; A. Moro-Martín; T. Nishimura; T. -S. Pyo; E. Serabyn; H. Suto; R. Suzuki; M. Takami; N. Takato; H. Terada; C. Thalmann; D. Tomono; M. Watanabe; T. Yamada; H. Takami; T. Usuda; M. Tamura
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eye 3
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We conduct a statistical analysis of a combined sample of direct imaging data, totalling nearly 250 stars. The stars cover a wide range of ages and spectral types, and include five detections ($\kappa$ And b, two $\sim$60 M$_{\rm J}$ brown dwarf companions in the Pleiades, PZ Tel B, and CD$-$35 2722B). For some analyses we add a currently unpublished set of SEEDS observations, including the detections GJ 504b and GJ 758B. We conduct a uniform, Bayesian analysis of all stellar ages using both...
Topics: Earth and Planetary Astrophysics, Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1404.5335
123
123
Sep 17, 2013
09/13
by
M. B. Stumpf; W. Brandner; H. Bouy; Th. Henning; S. Hippler
texts
eye 123
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The transition from the L to the T spectral type of brown dwarfs is marked by a very rapid transition phase, remarkable brightening in the J-band and a higher binary frequency. Despite being an active area of inquiry, this transition regime still remains one of the most poorly understood phases of brown dwarf evolution. We resolved the L dwarf 2MASS J03105986+1648155 for the first time into two almost equally bright components straddling the L/T transition. Since such a co-eval system with...
Source: http://arxiv.org/abs/1003.3807v1
37
37
Sep 18, 2013
09/13
by
D. A. Gouliermis; A. E. Dolphin; W. Brandner; Th. Henning
texts
eye 37
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We present a photometric study of the star-forming region NGC 346 and its surrounding field in the Small Magellanic Cloud, using data taken with the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope (HST). The data set contains both short and long exposures for increased dynamic range, and photometry was performed using the ACS module of the stellar photometry package DOLPHOT. We detected almost 100,000 stars over a magnitude range of V ~ 11 to V ~ 28 mag, including all...
Source: http://arxiv.org/abs/astro-ph/0606582v2
2
2.0
Jun 28, 2018
06/18
by
A. -M. Lagrange; M. Langlois; R. Gratton; A. -L. Maire; J. Milli; J. Olofsson; A. Vigan; V. Bailey; D. Mesa; G. Chauvin; A. Boccaletti; R. Galicher; J. M. Girard; M. Bonnefoy; M. Samland; F. Menard; T. Henning; M. Kenworthy; C. Thalmann; H. Beust; J. -L. Beuzit; W. Brandner; E. Buenzli; A. Cheetham; M. Janson; H. le Coroller; J. Lannier; D. Mouillet; S. Peretti; C. Perrot; G. Salter; E. Sissa; Z. Wahhaj; L. Abe; S. Desidera; M. Feldt; F. Madec; D. Perret; C. Petit; P. Rabou; C. Soenke; L. Weber
texts
eye 2
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HD~106906AB is so far the only young binary system around which a planet has been imaged and a debris disk evidenced thanks to a strong IR excess. As such, it represents a unique opportunity to study the dynamics of young planetary systems. We aim at further investigating the close (tens of au scales) environment of the HD~106906AB system. We used the extreme AO fed, high contrast imager SPHERE recently installed on the VLT to observe HD~106906. Both the IRDIS imager and the Integral Field...
Topics: Astrophysics, Earth and Planetary Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1510.02511
3
3.0
Jun 29, 2018
06/18
by
C. Perrot; A. Boccaletti; E. Pantin; J-C. Augereau; A-M. Lagrange; R. Galicher; A-L. Maire; J. Mazoyer; J. Milli; G. Rousset; R. Gratton; M. Bonnefoy; W. Brandner; E. Buenzli; M. Langlois; J. Lannier; D. Mesa; S. Peretti; G. Salter; E. Sissa; G. Chauvin; S. Desidera; M. Feldt; A. Vigan; E. Di Folco; A. Dutrey; J. Péricaud; P. Baudoz; M. Benisty; J. De Boer; A. Garufi; J. H. Girard; F. Menard; J. Olofsson; S. P. Quanz; D. Mouillet; V. Christiaens; S. Casassus; J. -L. Beuzit; P. Blanchard; M. Carle; T. Fusco; E. Giro; N. Hubin; D. Maurel; O. Moeller-Nilsson; A. Sevin; L. Weber
texts
eye 3
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Transition disks correspond to a short stage between the young protoplanetary phase and older debris phase. Along this evolutionary sequence, the gas component disappears leaving room for a dust-dominated environment where already-formed planets signpost their gravitational perturbations. We endeavor to study the very inner region of the well-known and complex debris, but still gas-rich disk, around HD 141569A using the exquisite high-contrast capability of SPHERE at the VLT. Recent...
Topics: Earth and Planetary Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1605.00468
53
53
Sep 20, 2013
09/13
by
E. L. Martin; G. Basri; W. Brandner; J. Bouvier; Zapatero Osorio M. R.; R. Rebolo; J. Stauffer; F. Allard; I. Baraffe; S. T. Hodgkin
texts
eye 53
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Hubble Space Telescope NICMOS observations are presented of six brown dwarf candidates in the Pleiades open cluster. One of them, namely CFHT-Pl-18, is clearly resolved as a binary with an angular separation of 0".33. The very low density of contaminating background stars in our images and the photometry of the components support that this system is a physical binary rather than a chance projection. All the available photometric and spectroscopic data indicate that the CFHT-Pl-18 system is...
Source: http://arxiv.org/abs/astro-ph/9810387v1
28
28
Sep 18, 2013
09/13
by
J. Hashimoto; M. Tamura; T. Muto; T. Kudo; M. Fukagawa; T. Fukue; M. Goto; C. A. Grady; T. Henning; K. Hodapp; M. Honda; S. Inutsuka; E. Kokubo; G. Knapp; M. W. McElwain; M. Momose; N. Ohashi; Y. K. Okamoto; M. Takami; E. L. Turner; J. Wisniewski; M. Janson; L. Abe; W. Brandner; J. Carson; S. Egner; M. Feldt; T. Golota; O. Guyon; Y. Hayano; M. Hayashi; S. Hayashi; M. Ishii; R. Kandori; N. Kusakabe; T. Matsuo; S. Mayama; S. Miyama; J. -I. Morino; A. Moro-Martin; T. Nishimura; T. -S. Pyo; H. Suto; R. Suzuki; N. Takato; H. Terada; C. Thalmann; D. Tomono; M. Watanabe; T. Yamada; H. Takami; T. Usuda
texts
eye 28
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We report high-resolution 1.6 $\micron$ polarized intensity ($PI$) images of the circumstellar disk around the Herbig Ae star AB Aur at a radial distance of 22 AU ($0."15$) up to 554 AU (3.$"$85), which have been obtained by the high-contrast instrument HiCIAO with the dual-beam polarimetry. We revealed complicated and asymmetrical structures in the inner part ($\lesssim$140 AU) of the disk, while confirming the previously reported outer ($r$ $\gtrsim$200 AU) spiral structure. We have...
Source: http://arxiv.org/abs/1102.4408v1
92
92
Sep 22, 2013
09/13
by
M. B. Stumpf; W. Brandner; Th. Henning; H. Bouy; R. Koehler; F. Hormuth; V. Joergens; M. Kasper
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eye 92
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We have monitored the benchmark L dwarf binary Kelu-1AB over the past 3 years to derive improved spectral types and luminosities for the individual components. The astrometric measurements enable us to compute the orbital parameters and result in the first dynamical mass estimate for the system. We obtained resolved high angular resolution, near-IR images with HST and the VLT/NACO adaptive optics instrument in the J, H and Ks bands. In addition we used NACO to achieve the first spatially...
Source: http://arxiv.org/abs/0811.0556v1
72
72
Sep 18, 2013
09/13
by
L. M. Close; D. Potter; W. Brandner; M. Lloyd-Hart; J. Liebert; A. Burrows; N. Siegler
texts
eye 72
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Use of the highly sensitive Hokupa'a curvature wavefront sensor has allowed for the first time direct adaptive optics (AO) guiding on brown dwarfs and VLM stars (SpT=M7-L2). An initial survey of 9 such objects discovered one 0.15" binary (2MASSJ 1426316+155701). The companion is about half as bright as the primary (Delta K = 0.61+/-0.05$, Delta H = 0.70+/-0.05) and has even redder colors H-K=0.59+/-0.14 than the primary. The blended spectrum of the binary has been previously determined to...
Source: http://arxiv.org/abs/astro-ph/0110669v1
46
46
Sep 19, 2013
09/13
by
G. Chauvin; A-M. Lagrange; H. Beust; T. Fusco; D. Mouillet; F. Lacombe; E. Gendron; G. Rousset; D. Rouan; W. Brandner; R. Lenzen; N. Hubin; M. Hartung; C. Perrier
texts
eye 46
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We report the detection of a possible subsolar mass companion to the triple young system TY CrA using the NACO instrument at the VLT UT4 during its commissioning. Assuming for TY CrA a distance similar to that of the close binary system HD 176386, the photometric spectral type of this fourth stellar component candidate is consistent with an ~M4 star. We discuss the dynamical stability of this possible quadruple system as well as the possible location of dusty particles inside or outside the...
Source: http://arxiv.org/abs/astro-ph/0304271v1
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35
Sep 18, 2013
09/13
by
S. Mayama; J. Hashimoto; T. Muto; T. Tsukagoshi; N. Kusakabe; M. Kuzuhara; Y. Takahashi; T. Kudo; R. Dong; M. Fukagawa; M. Takami; M. Momose; J. P. Wisniewski; K. Follette; L. Abe; E. Akiyama; W. Brandner; T. Brandt; J. Carson; S. Egner; M. Feldt; M. Goto; C. A. Grady; O. Guyon; Y. Hayano; M. Hayashi; S. Hayashi; T. Henning; K. W. Hodapp; M. Ishii; M. Iye; M. Janson; R. Kandori; J. Kwon; G. R. Knapp; T. Matsuo; M. W. McElwain; S. Miyama; J. -I. Morino; A. Moro-Martin; T. Nishimura; T. -S. Pyo; E. Serabyn; H. Suto; R. Suzuki; N. Takato; H. Terada; C. Thalmann; D. Tomono; E. L. Turner; M. Watanabe; T. Yamada; H. Takami; T. Usuda; M. Tamura
texts
eye 35
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We report high-resolution (0.07 arcsec) near-infrared polarized intensity images of the circumstellar disk around the star 2MASS J16042165-2130284 obtained with HiCIAO mounted on the Subaru 8.2 m telescope. We present our $H$-band data, which clearly exhibits a resolved, face-on disk with a large inner hole for the first time at infrared wavelengths. We detect the centrosymmetric polarization pattern in the circumstellar material as has been observed in other disks. Elliptical fitting gives the...
Source: http://arxiv.org/abs/1211.3284v1
46
46
Sep 21, 2013
09/13
by
D. Apai; I. Pascucci; W. Brandner; Th. Henning; R. Lenzen; D. E. Potter; A. -M. Lagrange; G. Rousset
texts
eye 46
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We present high-contrast imaging data on the disk of the classical T Tauri star TW Hya. The images were obtained through the polarimetric differential imaging technique with the adaptive optics system NACO. Our commissioning data show the presence of polarized disk emission between 0.1" and 1.4" from the star. We derive the first Ks-band radial polarized intensity distribution. We show that the polarized intensity compares well to shorter wavelengths surface brightness observations...
Source: http://arxiv.org/abs/astro-ph/0311194v1
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56
Sep 20, 2013
09/13
by
H. Bouy; E. L. Martin; W. Brandner; J. Bouvier
texts
eye 56
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We present results showing that the multiple system DENIS-P J020529.0-115925 is likely to be a triple system of brown dwarfs. The secondary of this previously known binary system shows a clear elongation on six images obtained at six different epochs. Significant residuals remain after PSF subtraction on these images, characteristic of multiplicity, and indicating that the secondary is probably a double itself. Dual-PSF fitting shows that the shape of the secondary is consistent with that of a...
Source: http://arxiv.org/abs/astro-ph/0410226v1
2
2.0
Jun 29, 2018
06/18
by
Z. Khorrami; T. Lanz; F. Vakili; E. Lagadec; M. Langlois; W. Brandner; O. Chesneau; M. R. Meyer; M. Carbillet; L. Abe; D. Mouillet; JL. Beuzit; A. Boccaletti; C. Perrot; C. Thalmann; H. -M. Schmid; A. Pavlov; A. Costille; K. Dohlen; D. Le Mignant; C. Petit; J. F. Sauvage
texts
eye 2
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We present new near-infrared photometric measurements of the core of the young massive cluster NGC 3603 obtained with extreme adaptive optics. The data were obtained with the SPHERE instrument mounted on ESO Very Large Telescope, and cover three fields in the core of this cluster. We applied a correction for the effect of extinction to our data obtained in the J and K broadband filters and estimated the mass of detected sources inside the field of view of SPHERE/IRDIS, which is...
Topics: Astrophysics, Solar and Stellar Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1603.00457
2
2.0
Jun 29, 2018
06/18
by
E. Akiyama; J. Hashimoto; H. B. Liu; J. I -H. Li; M. Bonnefoy; R. Dong; Y. Hasegawa; T. Henning; M. L. Sitko; M. Janson; M. Feldt; J. Wisniewski; T. Kudo; N. Kusakabe; T. Tsukagoshi; M. Momose; T. Muto; T. Taki; M. Kuzuhara; S. Mayama; M. Takami; N. Ohashi; C. A. Grady; J. Kwon; C. Thalmann; L. Abe; W. Brandner; T. D. Brandt; J. C. Carson; S. Egner; M. Goto; O. Guyon; Y. Hayano; M. Hayashi; S. S. Hayashi; K. W. Hodapp; M. Ishii; M. Iye; G. R. Knapp; R. Kandori; T. Matsuo; M. W. McElwain; S. Miyama; J. -I. Morino; A. Moro-Martin; T. Nishimura; T. -S. Pyo; E. Serabyn; T. Suenaga; H. Suto; R. Suzuki; Y. H. Takahashi; N. Takato; H. Terada; D. Tomono; E. L. Turner; M. Watanabe; T. Yamada; H. Takami; T. Usuda; M. Tamura
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eye 2
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Dust trapping accelerates the coagulation of dust particles, and thus it represents an initial step toward the formation of planetesimals. We report $H$-band (1.6 um) linear polarimetric observations and 0.87 mm interferometric continuum observations toward a transitional disk around LkHa 330. As results, a pair of spiral arms were detected in the $H$-band emission and an asymmetric (potentially arm-like) structure was detected in the 0.87 mm continuum emission. We discuss the origin of the...
Topics: Earth and Planetary Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1607.04708
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52
Sep 21, 2013
09/13
by
M. Janson; J. Carson; C. Thalmann; M. W. McElwain; M. Goto; J. Crepp; J. Wisniewski; L. Abe; W. Brandner; A. Burrows; S. Egner; M. Feldt; C. A. Grady; T. Golota; O. Guyon; J. Hashimoto; Y. Hayano; M. Hayashi; S. Hayashi; T. Henning; K. W. Hodapp; M. Ishii; M. Iye; R. Kandori; G. R. Knapp; T. Kudo; N. Kusakabe; M. Kuzuhara; T. Matsuo; S. Mayama; S. Miyama; J. -I. Morino; A. Moro-Martin; T. Nishimura; T. -S. Pyo; E. Serabyn; H. Suto; R. Suzuki; M. Takami; N. Takato; H. Terada; B. Tofflemire; D. Tomono; E. L. Turner; M. Watanabe; T. Yamada; H. Takami; T. Usuda; M. Tamura
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eye 52
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GJ 758 B is a cold (~600K) companion to a Sun-like star at 29 AU projected separation, which was recently detected with high-contrast imaging. Here we present photometry of the companion in seven photometric bands from Subaru/HiCIAO, Gemini/NIRI and Keck/NIRC2, providing a rich sampling of the spectral energy distribution in the 1-5 micron wavelength range. A clear detection at 1.58 micron combined with an upper limit at 1.69 micron shows methane absorption in the atmosphere of the companion....
Source: http://arxiv.org/abs/1011.5505v2
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34
Sep 22, 2013
09/13
by
M. Janson; C. Bergfors; M. Goto; W. Brandner; D. Lafreniere
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eye 34
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HR 8799 is a multi-planet system detected in direct imaging, with three companions known so far. Here, we present spatially resolved VLT/NACO 3.88--4.10 micron spectroscopy of the middle planet, HR 8799 c, which has an estimated mass of ~10 Mjup, temperature of ~1100 K and projected separation of 38 AU. The spectrum shows some differences in the continuum from existing theoretical models, particularly longwards of 4 microns, implying that detailed cloud structure or non-equilibrium conditions...
Source: http://arxiv.org/abs/1001.2017v1
2
2.0
Jun 28, 2018
06/18
by
C. Bergfors; W. Brandner; M. Bonnefoy; J. Schlieder; M. Janson; Th. Henning; G. Chauvin
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eye 2
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We present VLT/SINFONI J, H+K spectra of seven close visual pairs in M dwarf binary/triple systems, discovered or observed by the AstraLux M dwarf survey. We determine the spectral types to within 1.0 subclasses from comparison to template spectra and the strength of K-band water absorption, and derive effective temperatures. The results are compared to optical spectral types of the unresolved binary/multiple systems, and we confirm that our photometric method to derive spectral types in the...
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1511.09119
2
2.0
Jun 29, 2018
06/18
by
R. Asensio-Torres; M. Janson; J. Hashimoto; C. Thalmann; T. Currie; E. Buenzli; T. Kudo; M. Kuzuhara; N. Kusakabe; L. Abe; E. Akiyama; W. Brandner; T. D. Brandt; J. Carson; S. Egner; M. Feldt; M. Goto; C. Grady; O. Guyon; Y. Hayano; M. Hayashi; S. Hayashi; T. Henning; K. Hodapp; M. Ishii; M. Iye; R. Kandori; G. Knapp; J. Kwon; T. Matsuo; M. McElwain; S. Mayama; S. Miyama; J. Morino; A. Moro-Martin; T. Nishimura; T. Pyo; E. Serabyn; T. Suenaga; H. Suto; R. Suzuki; Y. Takahashi; M. Takami; N. Takato; H. Terada; E. Turner; M. Watanabe; J. Wisniewski; T. Yamada; H. Takami; T. Usuda; M. Tamura
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eye 2
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We present high-contrast angular differential imaging (ADI) observations of the debris disk around HD 32297 in H-band, as well as the first polarimetric images for this system in polarized differential imaging (PDI) mode with Subaru/HICIAO. In ADI, we detect the nearly edge-on disk at >5sigma levels from ~0.45 arcsec to ~1.7 arcsec (50-192 AU) from the star and recover the spine deviation from the midplane already found in previous works. We also find for the first time imaging and surface...
Topics: Earth and Planetary Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1605.03984
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8.0
Jun 27, 2018
06/18
by
N. Blind; F. Eisenhauer; S. Gillessen; Y. Kok; M. Lippa; G. Perrin; R. Dembet; P. Fedou; S. Lacour; K. Perraut; L. Jocou; L. Burtscher; O. Hans; M. Haug; F. Haussmann; S. Huber; A. Janssen; S. Kellner; T. Ott; O. Pfuhl; E. Sturm; J. Weber; E. Wieprecht; A. Amorim; W. Brandner; C. Straubmeier
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eye 8
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GRAVITY is the second generation Very Large Telescope Interferometer instrument for precision narrow-angle astrometry and interferometric imaging in the Near Infra-Red (NIR). It shall provide precision astrometry of order 10 microarcseconds, and imaging capability at a few milliarcsecond resolution, and hence will revolutionise dynamical measurements of celestial objects. GRAVITY is currently in the last stages of its integration and tests in Garching at MPE, and will be delivered to the VLT...
Topics: Instrumentation and Methods for Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1503.07303
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33
Sep 20, 2013
09/13
by
N. Kusakabe; C. A. Grady; M. L. Sitko; J. Hashimoto; T. Kudo; M. Fukagawa; T. Muto; J. P. Wisniewski; M. Min; S. Mayama; C. Werren; A. N. Day; L. C. Beerman; D. K. Lynch; R. W. Russell; S. M. Brafford; M. Kuzuhara; T. D. Brandt; L. Abe; W. Brandner; J. Carson; S. Egner; M. Feldt; M. Goto; O. Guyon; Y. Hayano; M. Hayashi; S. S. Hayashi; T. Henning; K. W. Hodapp; M. Ishii; M. Iye; M. Janson; R. Kandori; G. R. Knapp; T. Matsuo; M. W. McElwain; S. Miyama; J. -I. Morino; A. Moro-Martin; T. Nishimura; T. -S. Pyo; H. Suto; R. Suzuki; M. Takami; N. Takato; H. Terada; C. Thalmann; D. Tomono; E. L. Turner; M. Watanabe; T. Yamada; H. Takami; T. Usuda; M. Tamura
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One of the key predictions of modeling from the IR excess of Herbig Ae stars is that for protoplanetary disks, where significant grain growth and settling has occurred, the dust disk has flattened to the point that it can be partially or largely shadowed by the innermost material at or near the dust sublimation radius. When the self-shadowing has already started, the outer disk is expected to be detected in scattered light only in the exceptional cases that the scale height of the dust disk at...
Source: http://arxiv.org/abs/1205.3159v1
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30
Sep 18, 2013
09/13
by
Ruobing Dong; Jun Hashimoto; Roman Rafikov; Zhaohuan Zhu; Barbara Whitney; Tomoyuki Kudo; Takayuki Muto; Timothy Brandt; Melissa K. McClure; John Wisniewski; L. Abe; W. Brandner; J. Carson; S. Egner; M. Feldt; M. Goto; C. Grady; O. Guyon; Y. Hayano; M. Hayashi; S. Hayashi; T. Henning; K. W. Hodapp; M. Ishii; M. Iye; M. Janson; R. Kandori; G. R. Knapp; N. Kusakabe; M. Kuzuhara; J. Kwon; T. Matsuo; M. McElwain; S. Miyama; J. -I. Morino; A. Moro-Martin; T. Nishimura; T. -S. Pyo; G. Serabyn; H. Suto; R. Suzuki; M. Takami; N. Takato; H. Terada; C. Thalmann; D. Tomono; E. Turner; M. Watanabe; T. Yamada; H. Takami; T. Usuda; M. Tamura
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Through detailed radiative transfer modeling, we present a disk+cavity model to simultaneously explain both the SED and Subaru H-band polarized light imaging for the pre-transitional protoplanetary disk PDS 70. Particularly, we are able to match not only the radial dependence, but also the absolute scale, of the surface brightness of the scattered light. Our disk model has a cavity 65 AU in radius, which is heavily depleted of sub-micron-sized dust grains, and a small residual inner disk which...
Source: http://arxiv.org/abs/1209.3772v2
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34
Sep 20, 2013
09/13
by
H. Bouy; W. Brandner; E. L. Martin; X. Delfosse; F. Allard; I. Baraffe; T. Forveille; R. Demarco
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eye 34
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We present imaging and spectroscopic observations with HST (WFPC2, ACS/HRC and STIS), VLT (FORS2) and Keck (HIRES) of the dM8 ultra-cool dwarf DENIS-P J185950.9-370632, located in the R-CrA region. The presence of lithium absorption at 670.8 nm and the strong Halpha emission indicate a young age and a sub-stellar mass. Our diffraction-limited images resolve a companion at the separation limit of HST/ACS (~0.06"). The 2.1 mJy flux in the LW2 filter (5.0-8.5 microns) of the Infrared Space...
Source: http://arxiv.org/abs/astro-ph/0404576v1
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65
Sep 20, 2013
09/13
by
B. A. Biller; M. Kasper; L. M. Close; W. Brandner; S. Kellner
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eye 65
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We present VLT/NACO SDI images of the very nearby star SCR 1845-6357 (hereafter SCR 1845). SCR 1845 is a recently discovered (Hambly et al. 2004) M8.5 star just 3.85 pc from the sun (Henry et al. 2006). Using the capabilities of the unique SDI device, we discovered a substellar companion to SCR 1845 at a separation of 4.5 AU (1.170''+-0.003'' on the sky) and fainter by 3.57+-0.057 mag in the 1.575 um SDI filter. This substellar companion has an H magnitude of 13.16+0.31-0.26 (absolute H...
Source: http://arxiv.org/abs/astro-ph/0601440v3
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37
Sep 22, 2013
09/13
by
R. van Boekel; P. Kervella; M. Schoeller; T. Herbst; W. Brandner; L. B. F. M. Waters; D. J. Hillier; F. Paresce; R. Lenzen; A. -M. Lagrange
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eye 37
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We present new high angular resolution observations at near-IR wavelengths of the core of the Luminous Blue Variable Eta Carinae, using NAOS-CONICA at the VLT and VINCI at the VLT Interferometer (VLTI). The latter observations provide spatial information on a scale of 5 milli-arcsec or ~11 AU at the distance of Eta Carinae. The present-day stellar wind of Eta Carinae is resolved on a scale of several stellar radii. Assuming spherical symmetry, we find a mass loss rate of 1.6x10^{-3} M_sun/yr...
Source: http://arxiv.org/abs/astro-ph/0310399v1
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41
Sep 23, 2013
09/13
by
C. Thalmann; M. Janson; E. Buenzli; T. D. Brandt; J. P. Wisniewski; A. Moro-Martín; T. Usuda; G. Schneider; J. Carson; M. W. McElwain; C. A. Grady; M. Goto; L. Abe; W. Brandner; C. Dominik; S. Egner; M. Feldt; T. Fukue; T. Golota; O. Guyon; J. Hashimoto; Y. Hayano; M. Hayashi; S. Hayashi; T. Henning; K. W. Hodapp; M. Ishii; M. Iye; R. Kandori; G. R. Knapp; T. Kudo; N. Kusakabe; M. Kuzuhara; T. Matsuo; S. Miyama; J. -I. Morino; T. Nishimura; T. -S. Pyo; E. Serabyn; H. Suto; R. Suzuki; Y. H. Takahashi; M. Takami; N. Takato; H. Terada; D. Tomono; E. L. Turner; M. Watanabe; T. Yamada; H. Takami; M. Tamura
texts
eye 41
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We present high-contrast images of HR 4796 A taken with Subaru/HiCIAO in H-band, resolving the debris disk in scattered light. The application of specialized angular differential imaging methods (ADI) allows us to trace the inner edge of the disk with high precision, and reveals a pair of "streamers" extending radially outwards from the ansae. Using a simple disk model with a power-law surface brightness profile, we demonstrate that the observed streamers can be understood as part of...
Source: http://arxiv.org/abs/1110.2488v1
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64
Jul 20, 2013
07/13
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R. Dong; R. Rafikov; Z. Zhu; L. Hartmann; B. Whitney; T. Brandt; T. Muto; J. Hashimoto; C. Grady; K. Follette; M. Kuzuhara; R. Tanii; Y. Itoh; C. Thalmann; J. Wisniewski; S. Mayama; M. Janson; L. Abe; W. Brandner; J. Carson; S. Egner; M. Feldt; M. Goto; O. Guyon; Y. Hayano; M. Hayashi; S. Hayashi; T. Henning; K. W. Hodapp; M. Honda; S. Inutsuka; M. Ishii; M. Iye; R. Kandori; G. R. Knapp; T. Kudo; N. Kusakabe; T. Matsuo; M. W. McElwain; S. Miyama; J. -I. Morino; A. Moro-Martin; T. Nishimura; T. -S. Pyo; H. Suto; R. Suzuki; M. Takami; N. Takato; H. Terada; D. Tomono; E. L. Turner; M. Watanabe; T. Yamada; H. Takami; T. Usuda; M. Tamura
texts
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Transitional circumstellar disks around young stellar objects have a distinctive infrared deficit around 10 microns in their Spectral Energy Distributions (SED), recently measured by the Spitzer Infrared Spectrograph (IRS), suggesting dust depletion in the inner regions. These disks have been confirmed to have giant central cavities by imaging of the submillimeter (sub-mm) continuum emission using the Submillimeter Array (SMA). However, the polarized near-infrared scattered light images for...
Source: http://arxiv.org/abs/1203.1612v1
90
90
Sep 17, 2013
09/13
by
R. Neuhaeuser; E. Guenther; W. Brandner; N. Huelamo; T. Ott; J. Alves; F. Comeron; A. Eckart; J. -G. Cuby
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eye 90
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We report first results from our ground-based infrared imaging search for sub-stellar companions (brown dwarfs and giant planets) of young (up to 100 Myrs) nearby (up to 75 pc) stars, where companions should be well separated from the central stars and still relatively bright due to ongoing accretion and/or contraction. Among our targets are all members of the TW Hya association, as well as other binary and single young stars either discovered recently among ROSAT sources (some of which as yet...
Source: http://arxiv.org/abs/astro-ph/0007305v1
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32
Sep 18, 2013
09/13
by
E. L. Nielsen; L. M. Close; J. C. Guirado; B. A. Biller; R. Lenzen; W. Brandner; M. Hartung; C. Lidman
texts
eye 32
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We expand upon the results of Close et al. 2005 regarding the young, low-mass object AB Dor C and its role as a calibration point for theoretical tracks. We present an improved spectral reduction and a new orbital solution with two additional epochs. Our improved analysis confirms our spectral type of M8 (+/- 1) and mass of 0.090+/-0.003 solar masses for AB Dor C. Comparing the results for AB Dor C with other young, low-mass objects with dynamical masses we find a general trend where current...
Source: http://arxiv.org/abs/astro-ph/0509400v1
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66
Sep 18, 2013
09/13
by
K. Geissler; S. Kellner; W. Brandner; E. Masciadri; M. Hartung; T. Henning; R. Lenzen; L. Close; M. Endl; M. Kuerster
texts
eye 66
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We have carried out a direct and differential imaging search for sub-stellar companions to eps Indi A using the adaptive optics system NACO at the ESO VLT. The observations were carried out in September 2004 with NACO/SDI as well as with NACO's S27 camera in the H and Ks filters. The SDI data cover an area of \~2.8" around eps Indi A. No detection was achieved in the inner neighbourhood down to 53 Mj (5 sigma confidence level) at a separation > 0.4" (1.45 AU) and down to 21 Mj for...
Source: http://arxiv.org/abs/astro-ph/0611336v1
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63
Jul 20, 2013
07/13
by
B. Brandl; W. Brandner; F. Eisenhauer; A. F. J. Moffat; F. Palla; H. Zinnecker
texts
eye 63
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We have observed NGC 3603, the most massive visible HII region known in the Galaxy, with ANTU(VLT1)/ISAAC in the near-infrared (NIR) J_s, H, and K_s bands. Our observations are the most sensitive observations made to date of this dense starburst region, allowing us to investigate with unprecedented quality its low-mass stellar population. Our mass limit to stars detected in all three bands is 0.1 Mo for a pre-main sequence star of age 0.7 Myr. The overall age of the pre-main sequence stars in...
Source: http://arxiv.org/abs/astro-ph/9910238v1
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55
Sep 23, 2013
09/13
by
D. J. Butler; D. Martinez-Delgado; W. Brandner
texts
eye 55
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We present the first WFPC2 V, I photometry for the Sculptor Group galaxy NGC 300 in four fields ranging from the centre to the outer edge. We have made the first measurement of the star formation histories in two disk fields: the oldest stars were born at similar epochs and formation activity increased but at different mean rates. The main disk stellar population is predominantly old, consisting of RGB and AGB stars, based on a synthetic colour magnitude diagram analysis. Z is found to have...
Source: http://arxiv.org/abs/astro-ph/0312007v2
3
3.0
Jun 30, 2018
06/18
by
N. Blind; F. Eisenhauer; M. Haug; S. Gillessen; M. Lippa; L. Burtscher; O. Hans; F. Haussmann; S. Huber; A. Janssen; S. Kellner; Y. Kok; T. Ott; O. Pfuhl; E. Sturm; J. Weber; E. Wieprecht; A. Amorim; W. Brandner; G. Perrin; K. Perraut; C. Straubmeier
texts
eye 3
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We present in this paper the design and characterisation of a new sub-system of the VLTI 2nd generation instrument GRAVITY: the Calibration Unit. The Calibration Unit provides all functions to test and calibrate the beam combiner instrument: it creates two artificial stars on four beams, and dispose of four delay lines with an internal metrology. It also includes artificial stars for the tip-tilt and pupil guiding systems, as well as four metrology pick-up diodes, for tests and calibration of...
Topics: Instrumentation and Methods for Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1407.6660
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39
Jul 20, 2013
07/13
by
M. Zhang; W. Brandner; H. Wang; M. Gennaro; A. Bik; Th. Henning; R. Gredel; M. Smith; Th. Stanke
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eye 39
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We aim to take a census of molecular hydrogen emission line objects (MHOs) in the Rho Ophiuchi molecular cloud and to make the first systematic proper motion measurements of these objects in this region. Deep H2 near-infrared imaging is performed to search for molecular hydrogen emission line objects. Multi-epoch data are used to derive the proper motions of the features of these objects, and the lengths and opening angles of the molecular hydrogen outflows. Our imaging covers an area of about...
Source: http://arxiv.org/abs/1304.0195v1
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42
Sep 18, 2013
09/13
by
Timothy D. Brandt; Michael W. McElwain; Edwin L. Turner; L. Abe; W. Brandner; J. Carson; S. Egner; M. Feldt; T. Golota; M. Goto; C. A. Grady; O. Guyon; J. Hashimoto; Y. Hayano; M. Hayashi; S. Hayashi; T. Henning; K. W. Hodapp; M. Ishii; M. Iye; M. Janson; R. Kandori; G. R. Knapp; T. Kudo; N. Kusakabe; M. Kuzuhara; J. Kwon; T. Matsuo; S. Miyama; J. -I. Morino; A. Moro-Martin; T. Nishimura; T. -S. Pyo; E. Serabyn; H. Suto; R. Suzuki; M. Takami; N. Takato; H. Terada; C. Thalmann; D. Tomono; M. Watanabe; J. P. Wisniewski; T. Yamada; H. Takami; T. Usuda; M. Tamura
texts
eye 42
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We describe Algorithms for Calibration, Optimized Registration, and Nulling the Star in Angular Differential Imaging (ACORNS-ADI), a new, parallelized software package to reduce high-contrast imaging data, and its application to data from the SEEDS survey. We implement several new algorithms, including a method to register saturated images, a trimmed mean for combining an image sequence that reduces noise by up to ~20%, and a robust and computationally fast method to compute the sensitivity of...
Source: http://arxiv.org/abs/1209.3014v2
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43
Sep 23, 2013
09/13
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T. Muto; C. A. Grady; J. Hashimoto; M. Fukagawa; J. B. Hornbeck; M. Sitko; R. Russell; C. Werren; M. Cure; T. Currie; N. Ohashi; Y. Okamoto; M. Momose; M. Honda; S. Inutsuka; T. Takeuchi; R. Dong; L. Abe; W. Brandner; T. Brandt; J. Carson; S. Egner; M. Feldt; T. Fukue; M. Goto; O. Guyon; Y. Hayano; M. Hayashi; S. Hayashi; T. Henning; K. W. Hodapp; M. Ishii; M. Iye; M. Janson; R. Kandori; G. R. Knapp; T. Kudo; N. Kusakabe; M. Kuzuhara; T. Matsuo; S. Mayama; M. W. McElwain; S. Miyama; J. -I. Morino; A. Moro-Martin; T. Nishimura; T. -S. Pyo; E. Serabyn; H. Suto; R. Suzuki; M. Takami; N. Takato; H. Terada; C. Thalmann; D. Tomono; E. L. Turner; M. Watanabe; J. P. Wisniewski; T. Yamada; H. Takami; T. Usuda; M. Tamura
texts
eye 43
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We present high-resolution, H-band, imaging observations, collected with Subaru/HiCIAO, of the scattered light from the transitional disk around SAO 206462 (HD 135344B). Although previous sub-mm imagery suggested the existence of the dust-depleted cavity at r~46AU, our observations reveal the presence of scattered light components as close as 0.2" (~28AU) from the star. Moreover, we have discovered two small-scale spiral structures lying within 0.5" (~70AU). We present models for the...
Source: http://arxiv.org/abs/1202.6139v3
61
61
Sep 24, 2013
09/13
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A. Bik; Th. Henning; A. Stolte; W. Brandner; D. A. Gouliermis; M. Gennaro; A. Pasquali; B. Rochau; H. Beuther; N. Ageorges; W. Seifert; Y. Wang; N. Kudryavtseva
texts
eye 61
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We present near-infrared multi-object spectroscopy and JHKs imaging of the massive stellar content of the Galactic star-forming region W3 Main, obtained with LUCI at the Large Binocular Telescope. We confirm 15 OB stars in W3 Main and derive spectral types between O5V and B4V from their absorption line spectra. Three massive Young Stellar Objects are identified by their emission line spectra and near-infrared excess. The color-color diagram of the detected sources allows a detailed...
Source: http://arxiv.org/abs/1109.3467v1
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42
Sep 18, 2013
09/13
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W. Brandner; H. Zinnecker; J. M. Alcala; F. Allard; E. Covino; S. Frink; R. Kohler; M. Kunkel; A. Moneti; A. Schweitzer
texts
eye 42
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We present high-spatial resolution HST and adaptive optics observations, and high-sensitivity ISO (ISOCAM & ISOPHOT) observations of a sample of X-ray selected weak-line (WTTS) and post (PTTS) T Tauri stars located in the nearby Chamaeleon T and Scorpius-Centaurus OB associations. HST/NICMOS and adaptive optics observations aimed at identifying substellar companions at separations >=30 A.U. from the primary stars. No such objects were found within 300 A.U. of any of the target stars, and...
Source: http://arxiv.org/abs/astro-ph/0005048v1
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39
Sep 23, 2013
09/13
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J. C. Guirado; I. Marti-Vidal; J. M. Marcaide; L. M. Close; J. C. Algaba; W. Brandner; J. -F. Lestrade; D. L. Jauncey; D. L. Jones; R. A. Preston; J. E. Reynolds
texts
eye 39
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We present an astrometric analysis of the binary systems ABDorA /ABDorC and ABDorBa / ABDorBb. These two systems of well-known late-type stars are gravitationally associated and they constitute the quadruple ABDoradus system. From the astrometric data available at different wavelengths, we report: (i) a determination of the orbit of ABDorC, the very low mass companion to ABDorA, which confirms the mass estimate of 0.090Msun reported in previous works; (ii) a measurement of the parallax of...
Source: http://arxiv.org/abs/astro-ph/0510199v1
