Excess Infrared Radiation from the Massive DAZ White Dwarf GD 362: A Debris Disk?
نویسندگان
چکیده
منابع مشابه
Excess Infrared Radiation from the Massive Daz White Dwarf GD 362: A Debris Disk?
We report the discovery of excess K-band radiation from the massive DAZ white dwarf star GD 362. Combining infrared photometric and spectroscopic observations, we show that the excess radiation cannot be explained by a stellar or substellar companion, and is likely to be caused by a debris disk. This would be only the second such system known, discovered 18 years after G29-38, the only single w...
متن کاملDebris Disks Around White Dwarfs: The Daz Connection
We present near-infrared spectroscopic observations of 20 previously known DAZ white dwarfs obtained at the NASA Infrared Telescope Facility. Two of these white dwarfs (G29-38 and GD 362) are known to display significant K-band excesses due to circumstellar debris disks. Here we report the discovery of excess K-band radiation from another DAZ white dwarf, WD 0408 041 (GD 56). Using spectroscopi...
متن کاملJa n 20 07 Infrared Emission from the Dusty Disk Orbiting GD 362 , An Externally - Polluted White Dwarf
We report Spitzer Space Telescope photometry between 3.6 µm and 24 µm and spectroscopy between 5 µm and 15 µm of GD 362, a white dwarf with an effective temperature near 10,000 K that displays a remarkably high concentration of metals in its photosphere and a thermal infrared excess. We approximately reproduce both the infrared continuum and the very strong 10 µm silicate emission feature with ...
متن کاملA Dusty Disk Around GD 362, a White Dwarf With a Uniquely High Photospheric Metal Abundance
Eighteen years after an infrared excess was discovered associated with the white dwarf G29-38, we report ground-based measurements (JHKsKL N ) with mJy-level sensitivity of GD 362 that show it to be a second single white dwarf with an infrared excess. As a first approximation, the excess around GD 362, which amounts to ∼3% of the total stellar luminosity, can be explained by emission from a pas...
متن کاملDirect Distance Measurement to the Dusty White Dwarf GD 362 1
We present trigonometric parallax observations of GD 362 obtained over seven epochs using the MDM 2.4m Hiltner Telescope. The existence of a dust disk around this possibly massive white dwarf makes it an interesting target for parallax observations. The measured parallax for GD 362 places it at a distance of 50.6 −3.1 pc, which implies that its radius and mass are ≈ 0.0106R⊙ and 0.71M⊙, respect...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2005
ISSN: 0004-637X,1538-4357
DOI: 10.1086/497825