4 papers
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…
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This is to notify colleagues that our ApJ paper and corresponding astro-ph version are being withdrawn.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…
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…
Observational Constraints on the Origin of Metals in Cool DA-type White Dwarfs
R. Chary, B. Zuckerman, E. E. Becklin
We present ISOCAM 7 micron and 15 micron observations of 12 nearby white dwarfs, 6 of which have been found to have metals such as Ca, Mg and Fe in their photospheres. Our purpose…