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STIS Imaging of the HR 4796A Circumstellar Debris Ring
G. Schneider, A. J. Weinberger, E. E. Becklin +2
We have obtained high spatial resolution imaging observations of the HR 4796A circumstellar debris dust ring using the broad optical response of the Hubble Space Telescope Imaging…
Gas and Dust Associated with the Strange, Isolated, Star BP Piscium
B. Zuckerman, C. Melis, Inseok Song +15
We have carried out a multiwavelength observational campaign demonstrating some of the remarkable properties of the infrared-bright variable star BP Psc. Surrounded by a compact du…
Spitzer IRAC Observations of White Dwarfs. I. Warm Dust at Metal-Rich Degenerates
J. Farihi, B. Zuckerman, E. E. Becklin
This paper presents the results of a Spitzer IRAC 3-8 micron photometric search for warm dust orbiting 17 nearby, metal-rich white dwarfs, 15 of which apparently have hydrogen domi…
A Constant Spectral Index for Sagittarius A* During Infrared/X-ray Intensity Variations
S. D. Hornstein, K. Matthews, A. M. Ghez +5
We report the first time-series of broadband infrared (IR) color measurements of Sgr A*, the variable emission source associated with the supermassive black hole at the Galactic Ce…
Spitzer Observations of GD 362 and Other Metal-Rich White Dwarfs
J. Farihi, B. Zuckerman, E. E. Becklin +1
A {\em Spitzer} IRAC survey of 17 nearby metal-rich white dwarfs, nominally DAZ stars, reveals excess emission from only 3 targets: G29-38, GD 362 and G167-8. Observations of GD 36…
Sub-Arcsecond Mid-Infrared Observations of NGC 6240: Limitations of AGN-Starburst Power Diagnostics
E. Egami, G. Neugebauer, B. T. Soifer +3
In order to examine the relative importance of powerful starbursts and Compton-thick AGNs in NGC 6240, we have obtained mid-infrared images and low-resolution spectra of the galaxy…
High Spectral Resolution Observations of the Massive Stars in the Galactic Center
Angelle Tanner, Donald F. Figer, Paco Najarro +10
We present high-resolution near-infrared spectra, obtained with the NIRSPEC spectrograph on the W. M. Keck II Telescope, of a collection of hot, massive stars within the central 25…
Low Mass Companions to White Dwarfs
J. Farihi, B. Zuckerman, E. E. Becklin
This paper summarizes the results of over 17 years of work searching for low mass stellar and substellar companions to more than 370 nearby white dwarfs. Roughly 60 low mass, unevo…
A Dusty Disk Around GD 362, a White Dwarf With a Uniquely High Photospheric Metal Abundance
E. E. Becklin, J. Farihi, M. Jura +3
Eighteen years after an infrared excess was discovered associated with the white dwarf G29-38, we report ground-based measurements (JHKL'N') with mJy-level sensitivity of GD 362 th…
The First Laser Guide Star Adaptive Optics Observations of the Galactic Center: Sgr A*'s Infrared Color and the Extended Red Emission in its Vicinity
A. M. Ghez, S. D. Hornstein, J. Lu +14
(Abridged) We present the first Laser Guide Star Adaptive Optics (LGS-AO) observations of the Galactic center. LGS-AO has dramatically improved the quality, robustness, and versati…
IRS 16SW - A New Comoving Group of Young Stars in the Central Parsec of the Milky Way
J. R. Lu, A. M. Ghez, S. D. Hornstein +2
One of the most perplexing problems associated with the supermassive black hole at the center of our Galaxy is the origin of the young stars in its close vicinity. Using proper mot…
HD 199143 and HD 358623: Two Recently Identified Members of the Beta Pictoris Moving Group
D. Kaisler, B. Zuckerman, I. Song +5
HD 199143 and HD 358623 (BD-17 6128) are two sets of binary stars which are physically associated and 48 pc from Earth. We present heliocentric radial velocities and high lithium a…
Variable Infrared Emission from the Supermassive Black Hole at the Center of the Milky Way
A. M. Ghez, S. A. Wright, K. Matthews +7
We report the detection of a variable point source, imaged at L'(3.8 microns) with the W. M. Keck II 10-meter telescope's adaptive optics system, that is coincident to within 18 ma…
Stellar Orbits Around the Galactic Center Black Hole
A. M. Ghez, S. Salim, S. D. Hornstein +5
We present new proper motion measurements and simultaneous orbital solutions for three newly identified (S0-16, S0-19, and S0-20) and four previously known (S0-1, S0-2, S0-4, and S…
The Compact Nucleus of the Deep Silicate Absorption Galaxy NGC 4418
A. S. Evans, E. E. Becklin, N. Z. Scoville +6
High resolution, Hubble Space Telescope (HST) near-infrared and Keck mid-infrared images of the heavily extinguished, infrared luminous galaxy NGC 4418 are presented. These data ma…
The First Measurement of Spectral Lines in a Short-Period Star Bound to the Galaxy's Central Black Hole: A Paradox of Youth
A. M. Ghez, G. Duchene, K. Matthews +11
We have obtained the first detection of spectral absorption lines in one of the high-velocity stars in the vicinity of the Galaxy's central supermassive black hole. Both Brgamma (2…
The Search for Brown Dwarfs around White Dwarfs
J. Farihi, E. E. Becklin, B. Zuckerman
The infrared search for substellar companions to nearby white dwarfs has been going for a little more than a decade. The most recent phase has been a wide field proper motion searc…
Limits on the Short Term Variability of Sagittarius A* in the Near-Infrared
S. D. Hornstein, A. M. Ghez, A. Tanner +3
The recent detection of a 3-hr X-ray flare by the Chandra Observatory has raised the possibility of enhanced emission over a broad range of wavelengths from Sgr A*, the suspected 2…
GD248B, The Coolest Known Helium Atmosphere White Dwarf
J. Farihi, E. E. Becklin, B. Zuckerman
This is to notify colleagues that our ApJ paper and corresponding astro-ph version are being withdrawn. Optical spectroscopy obtained with a 3m class telescope gave no indication o…
Adaptive Optics Near-Infrared Spectroscopy of the Sgr A* Cluster
S. Gezari, A. M. Ghez, E. E. Becklin +3
We present K-band ~ 2600 spectroscopy of five stars (K ~ 14 - 16 mag) within 0.''5 of Sgr A*, the radio source associated with the compact massive object suspected to be a 2…
The Altitude of an Infrared Bright Cloud Feature on Neptune from Near-Infrared Spectroscopy
Henry G. Roe, James R. Graham, Ian S. McLean +8
We present 2.03-2.30 micron near-infrared spectroscopy of Neptune taken 1999 June 2 (UT) with the W.M. Keck Observatory's near-infrared spectrometer (NIRSPEC) during the commission…
Keck adaptive optics observations of TW Hydrae Association members
Bruce Macintosh, Claire Max, Ben Zuckerman +7
Adaptive optics (AO) on 8-10 m telescopes is an enormously powerful tool for studying young nearby stars. It is especially useful for searching for companions. Using AO on the 10-m…
High Resolution Mid-Infrared Imaging of Infrared Luminous Starburst Galaxies
B. T. Soifer, G. Neugebauer, K. Matthews +7
Observations for seven infrared luminous starburst galaxies are reported in the mid-infrared from 8 - 18 microns using the Keck Telescopes with spatial resolution approaching the d…
Finding Brown Dwarf Companions with HST/NICMOS
P. J. Lowrance, E. E. Becklin, G. Schneider +2
We present the results of a HST/NICMOS coronagraphic survey for the direct detection of substellar companions within the young TW Hydrae and Tucana Associations. At the distance of…