TY - GEN
T1 - Spitzer surveys of IR excesses of white dwarfs
AU - Chu, You Hua
AU - Gruendl, Robert A.
AU - Bilíková, Jana
AU - Riddle, Andrew
AU - Su, Kate Y.L.
N1 - Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2011
Y1 - 2011
N2 - IR excesses of white dwarfs (WDs) can be used to diagnose the presence of low-mass companions, planets, and circumstellar dust. Using different combinations of wavelengths and WD temperatures, circumstellar dust at different radial distances can be surveyed. The Spitzer Space Telescope has been used to search for IR excesses of white dwarfs. Two types of circumstellar dust disks have been found: (1) small disks around cool WDs with Teff < 20,000 K, and (2) large disks around hot WDs with Teff > 100,000 K. The small dust disks are within the Roche limit, and are commonly accepted to have originated from tidally crushed asteroids. The large dust disks, at tens of AU from the central WDs, have been suggested to be produced by increased collisions among Kuiper Belt-like objects. In this paper, we discuss Spitzer IRAC surveys of small dust disks around cool WDs, a MIPS survey of large dust disks around hot WDs, and an archival Spitzer survey of IR excesses of WDs.
AB - IR excesses of white dwarfs (WDs) can be used to diagnose the presence of low-mass companions, planets, and circumstellar dust. Using different combinations of wavelengths and WD temperatures, circumstellar dust at different radial distances can be surveyed. The Spitzer Space Telescope has been used to search for IR excesses of white dwarfs. Two types of circumstellar dust disks have been found: (1) small disks around cool WDs with Teff < 20,000 K, and (2) large disks around hot WDs with Teff > 100,000 K. The small dust disks are within the Roche limit, and are commonly accepted to have originated from tidally crushed asteroids. The large dust disks, at tens of AU from the central WDs, have been suggested to be produced by increased collisions among Kuiper Belt-like objects. In this paper, we discuss Spitzer IRAC surveys of small dust disks around cool WDs, a MIPS survey of large dust disks around hot WDs, and an archival Spitzer survey of IR excesses of WDs.
KW - IR excess
KW - circumstellar dust
KW - white dwarf
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U2 - 10.1063/1.3570979
DO - 10.1063/1.3570979
M3 - Conference contribution
AN - SCOPUS:79953866935
SN - 9780735408869
T3 - AIP Conference Proceedings
SP - 230
EP - 237
BT - Planetary Systems Beyond the Main Sequence - Proceedings of the International Conference "Planetary Systems Beyond the Main Sequence"
T2 - International Conference "Planetary Systems Beyond the Main Sequence"
Y2 - 11 August 2010 through 14 August 2010
ER -