ASpitzerSearch for Infrared Excesses around Massive Young White Dwarfs
نویسندگان
چکیده
منابع مشابه
A Spitzer Search for Infrared Excesses around Massive Young White Dwarfs
We examine 14 hot white dwarfs for signs of infrared excess using the Spitzer Space Telescope. Twelve of the objects are massive white dwarfs which have been suggested to be the result of binary mergers. The remaining two objects are undermassive white dwarfs which again may be the result of mergers or the inspiral of a substellar companion. In no case do we find any evidence for significant in...
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We present some results from a systematic survey for disks around spectroscopically identified young brown dwarfs and very low mass stars. We find that ≈75% of our sample show intrinsic IR excesses, indicative of circum(sub)stellar disks. The observed excesses are well-correlated with Hα emission, consistent with a common disk accretion origin. Because the excesses are modest, conventional anal...
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We suggest that Jovian planets will survive the late stages of stellar evolution, and that white dwarfs will retain planetary systems in wide orbits (∼ 5 AU). Utilising evolutionary models for Jovian planets, we show that infra-red imaging with 8m class telescopes of suitable nearby white dwarfs should allow us to resolve and detect companions ∼ 3MJUP. Detection of massive planetary companions ...
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We have performed a search for old planetary nebu-lae around hot white dwarfs by direct Hα narrow-band imaging. The 16 examined objects are white dwarfs representing different spectral subtypes, comprising DA and various non-DA stars, among them being PG 1159 stars and white dwarfs exhibiting spectral signatures of ongoing mass-loss by ultra-hot winds. The search was entirely negative – with on...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2006
ISSN: 0004-6256,1538-3881
DOI: 10.1086/499207