2
2.0
Jun 30, 2018
06/18
by
J. L. Close; J. M. Pittard
texts
eye 2
favorite 0
comment 0
We present three-dimensional simulations of a protoplanetary disk subject to the effect of a nearby (0.3pc distant) supernova, using a time-dependent flow from a one dimensional numerical model of the supernova remnant (SNR), in addition to constant peak ram pressure simulations. Simulations are performed for a variety of disk masses and inclination angles. We find disk mass-loss rates that are typically 1e-7 to 1e-6 Msol/yr (but peak near 1e-5 Msol/yr during the "instantaneous"...
Topics: Astrophysics of Galaxies, Solar and Stellar Astrophysics, Astrophysics, Earth and Planetary...
Source: http://arxiv.org/abs/1704.06308
49
49
Sep 23, 2013
09/13
by
H. E. Wheelwright; W. J. de Wit; R. D. Oudmaijer; M. G. Hoare; S. L. Lumsden; T. Fujiyoshi; J. L. Close
texts
eye 49
favorite 0
comment 0
Massive stars form whilst they are still embedded in dense envelopes. As a result, the roles of rotation, mass loss and accretion in massive star formation are not well understood. This study evaluates the source of the Q-band, lambda=19.5 microns, emission of massive young stellar objects (MYSOs). This allows us to determine the relative importance of rotation and outflow activity in shaping the circumstellar environments of MYSOs on 1000 AU scales. We obtained diffraction limited mid-infrared...
Source: http://arxiv.org/abs/1202.4348v1
7
7.0
Jun 28, 2018
06/18
by
M. Monelli; V. Testa; G. Bono; I. Ferraro; G. Iannicola; G. Fiorentino; C. Arcidiacono; D. Massari; K. Boutsia; R. Briguglio; L. Busoni; R. Carini; L. Close; G. Cresci; S. Esposito; L. Fini; M. Fumana; J. C. Guerra; J. Hill; C. Kulesa; F. Mannucci; D. McCarthy; E. Pinna; A. Puglisi; F. Quiros-Pacheco; R. Ragazzoni; A. Riccardi; A. Skemer; M. Xompero
texts
eye 7
favorite 0
comment 0
We present deep near-infrared (NIR) J, Ks photometry of the old, metal-poor Galactic globular cluster M\,15 obtained with images collected with the LUCI1 and PISCES cameras available at the Large Binocular Telescope (LBT). We show how the use of First Light Adaptive Optics system coupled with the (FLAO) PISCES camera allows us to improve the limiting magnitude by ~2 mag in Ks. By analyzing archival HST data, we demonstrate that the quality of the LBT/PISCES color magnitude diagram is fully...
Topics: Solar and Stellar Astrophysics, Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1507.08845
49
49
Sep 17, 2013
09/13
by
J. S. Jenkins; H. R. A. Jones; B. Biller; S. J. O'Toole; D. J. Pinfield; L. Close; C. G. Tinney; R. P. Butler; R. Wittenmyer; B. Carter; A. C. Day-Jones
texts
eye 49
favorite 0
comment 0
Direct imaging of brown dwarfs as companions to solar-type stars can provide a wealth of well-constrained data to "benchmark" the physics of such objects, since quantities like metallicity and age can be determined from their well-studied primaries. We present results from an adaptive optics imaging program on stars drawn from the Anglo-Australian and Keck Planet Search projects, with the aim of directly imaging known cool companions. Simulations have modeled the expected contrast...
Source: http://arxiv.org/abs/1003.2430v1
52
52
Jul 20, 2013
07/13
by
S. Esposito; D. Mesa; A. Skemer; C. Arcidiacono; R. U. Claudi; S. Desidera; R. Gratton; F. Mannucci; F. Marzari; E. Masciadri; L. Close; P. Hinz; C. Kulesa; D. McCarthy; J. Males; G. Agapito; J. Argomedo; K. Boutsia; R. Briguglio; G. Brusa; L. Busoni; G. Cresci; L. Fini; A. Fontana; J. C. Guerra; J. M. Hill; D. Miller; D. Paris; E. Pinna; A. Puglisi; F. Quiros-Pacheco; A. Riccardi; P. Stefanini; V. Testa; M. Xompero; C. Woodward
texts
eye 52
favorite 0
comment 0
We have performed H and Ks band observations of the planetary system around HR 8799 using the new AO system at the Large Binocular Telescope and the PISCES Camera. The excellent instrument performance (Strehl ratios up to 80% in H band) enabled detection the inner planet HR8799e in the H band for the first time. The H and Ks magnitudes of HR8799e are similar to those of planets c and d, with planet e slightly brighter. Therefore, HR8799e is likely slightly more massive than c and d. We also...
Source: http://arxiv.org/abs/1203.2735v2
114
114
Jul 20, 2013
07/13
by
E. Diolaiti; O. Bendinelli; D. Bonaccini; L. Close; D. Currie; G. Parmeggiani
texts
eye 114
favorite 0
comment 0
We describe a new code for the deep analysis of stellar fields, designed for Adaptive Optics Nyquist-sampled images with high and low Strehl ratio. The Point Spread Function is extracted directly from the image frame, to take into account the actual structure of the instrumental response and the atmospheric effects. The code is written in IDL language and organized in the form of a self-contained widget-based application, provided with a series of tools for data visualization and analysis. A...
Source: http://arxiv.org/abs/astro-ph/0009177v1
44
44
Sep 18, 2013
09/13
by
M. A. Kenworthy; K-H. Hofmann; L. Close; P. Hinz; E. Mamajek; D. Schertl; G. Weigelt; R. Angel; Y. Y. Balega; J. Hinz; G. Rieke
texts
eye 44
favorite 0
comment 0
The nearby late M star Gliese 569B was recently found by adaptive optics imaging to be a double with separation ~1 AU. To explore the orbital motion and masses, we have undertaken a high resolution (~0.05 arcsec) astrometric study. Images were obtained over 1.5 years with bispectrum speckle interferometry at the 6.5m MMT and 6m SAO telescopes. Our data show motion corresponding to more than half the orbital period, and constrain the total mass to be > 0.115 M_solar, with a most probable...
Source: http://arxiv.org/abs/astro-ph/0105157v1
49
49
Sep 19, 2013
09/13
by
E. Diolaiti; O. Bendinelli; D. Bonaccini; L. Close; D. Currie; G. Parmeggiani
texts
eye 49
favorite 0
comment 0
Starfinder is an IDL code for the deep analysis of stellar fields, designed for well-sampled images with high and low Strehl factor. An important feature is represented by the possibility to measure the anisoplanatic effect in wide-field Adaptive Optics observations and exploit this knowledge to improve the analysis of the observed field. A description of the method and applications to real AO data are presented.
Source: http://arxiv.org/abs/astro-ph/9911354v1
66
66
Jul 20, 2013
07/13
by
W. Brandner; S. Sheppard; H. Zinnecker; L. Close; F. Iwamuro; A. Krabbe; T. Maihara; K. Motohara; D. L. Padgett; A. Tokunaga
texts
eye 66
favorite 0
comment 0
Observations of the rho Ophiuchi star forming region with VLT ANTU and ISAAC under 0.35" seeing conditions reveal two bipolar reflection nebulosities intersected by central dust lanes. The sources (OphE-MM3 and CRBR 2422.8-3423) can be identified as spatially resolved circumstellar disks viewed close to edge-on, similar to edge-on disk sources discovered previously in the Taurus and Orion star forming regions. Millimeter continuum fluxes yield disk masses of the order of 0.01 Mo, i.e....
Source: http://arxiv.org/abs/astro-ph/0009141v1
35
35
Sep 20, 2013
09/13
by
H. Bouy; G. Duchene; R. Koehler; W. Brandner; J. Bouvier; E. L. Martin; A. Ghez; X. Delfosse; T. Forveille; F. Allard; I. Baraffe; G. Basri; L. Close; C. E. McCabe
texts
eye 35
favorite 0
comment 0
We present here the results of astrometric, photometric and spectroscopic observations leading to the determination of the orbit and dynamical masses of the binary L dwarf 2MASSW J0746425+2000321. High angular resolution observations spread over almost 4 years and obtained with the Hubble Space Telescope (HST), the ESO Very Large Telescope (VLT), and a the W. M. Keck Observatory (Keck) allow us to cover 36% of the period, corresponding to 60% of the orbit, and, for the first time, to derive a...
Source: http://arxiv.org/abs/astro-ph/0405111v1
26
26
Jun 28, 2018
06/18
by
N. Jovanovic; F. Martinache; O. Guyon; C. Clergeon; G. Singh; T. Kudo; V. Garrel; K. Newman; D. Doughty; J. Lozi; J. Males; Y. Minowa; Y. Hayano; N. Takato; J. Morino; J. Kuhn; E. Serabyn; B. Norris; P. Tuthill; G. Schworer; P. Stewart; L. Close; E. Huby; G. Perrin; S. Lacour; L. Gauchet; S. Vievard; N. Murakami; F. Oshiyama; N. Baba; T. Matsuo; J. Nishikawa; M. Tamura; O. Lai; F. Marchis; G. Duchene; T. Kotani; J. Woillez
texts
eye 26
favorite 0
comment 0
The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument is a multipurpose high-contrast imaging platform designed for the discovery and detailed characterization of exoplanetary systems and serves as a testbed for high-contrast imaging technologies for ELTs. It is a multi-band instrument which makes use of light from 600 to 2500nm allowing for coronagraphic direct exoplanet imaging of the inner 3 lambda/D from the stellar host. Wavefront sensing and control are key to the operation...
Topics: Instrumentation and Methods for Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1507.00017
66
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
favorite 0
comment 0
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
