Follow-up Study of Unusual White Dwarfs: Planets, Disks, and Deep 8 Micron Deficits

Details Follow-up Study of Unusual White Dwarfs: Planets, Disks, and Deep 8 Micron Deficits Follow-up Study of Unusual White Dwarfs: Planets, Disks, and Deep 8 Micron Deficits

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20026v&link_type=abstract

Spitzer Proposal ID #20026

Computer Science

Scientific paper

We have begun a survey of 130 white dwarfs (WDs) with Spitzer to search for infrared photometric anomalies caused by faint companions and disks. We propose follow-up photometry and spectroscopy of a few interesting objects uncovered so far that show signs of either novel absorption features or of hosting planets or disks. The novel absorption features appear in the coolest white dwarfs we surveyed; using white dwarfs to derive the age of the Galaxy demands understanding them. A few warmer white dwarfs with normal photospheres display excesses at 4.5 and/or 8 microns, signposts of giant planets or dust disks, respectively. This study holds an opportunity to take the first mid-infrared spectrum of an extrasolar planet.

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