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11 papers
Direct Imaging of Multiple Planets Orbiting the Star HR 8799
C. Marois, B. Macintosh, T. Barman +5
Direct imaging of exoplanetary systems is a powerful technique that can reveal Jupiter-like planets in wide orbits, can enable detailed characterization of planetary atmospheres, a…
Six White Dwarfs with Circumstellar Silicates
M. Jura, J. Farihi, B. Zuckerman
Spitzer Space Telescope spectra reveal 10 micron silicate emission from circumstellar dust orbiting six externally-polluted white dwarfs. Micron-size glasses with an olivine stoich…
Molecules in the disk orbiting the twin young suns of V4046 Sgr
Joel H. Kastner, B. Zuckerman, Pierre Hily-Blant +1
We report the results of a mm-wave molecular line survey of the nearby (D ~ 70 pc), 12 Myr-old system V4046 Sgr -- a tight (9 R_sun separation), short-period (2.42 day) binary with…
Planetary systems around close binary stars: the case of the very dusty, Sun-like, spectroscopic binary BD+20 307
B. Zuckerman, Francis C. Fekel, Michael H. Williamson +2
Field star BD+20 307 is the dustiest known main sequence star, based on the fraction of its bolometric luminosity, 4%, that is emitted at infrared wavelengths. The particles that c…
Spitzer IRAC Observations of White Dwarfs. II. Massive Planetary and Cold Brown Dwarf Companions to Young and Old Degenerates
J. Farihi, E. E. Becklin, B. Zuckerman
This paper presents a sensitive and comprehensive IRAC 3-8 m photometric survey of white dwarfs for companions in the planetary mass regime with temperatures cooler than the kno…
Warm dust in the terrestrial planet zone of a sun-like Pleiad: collisions between planetary embryos?
Joseph H. Rhee, Inseok Song, B. Zuckerman
Only a few solar-type main sequence stars are known to be orbited by warm dust particles; the most extreme is the G0 field star BD+20 307 that emits ~4% of its energy at mid-infrar…