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Title: A YOUNG WHITE DWARF WITH AN INFRARED EXCESS

Using observations of Spitzer/IRAC, we report the serendipitous discovery of excess infrared emission from a single white dwarf PG 0010+280. At a temperature of 27,220 K and a cooling age of 16 Myr, it is the hottest and youngest white dwarf to display an excess at 3–8 μm. The infrared excess can be fit by either an opaque dust disk within the tidal radius of the white dwarf or a 1300 K blackbody, possibly from an irradiated substellar object or a re-heated giant planet. PG 0010+280 has two unique properties that are different from white dwarfs with a dust disk: (i) relatively low emission at 8 μm and (ii) non-detection of heavy elements in its atmosphere from high-resolution spectroscopic observations with Keck/HIRES. The origin of the infrared excess remains unclear.
Authors:
; ; ;  [1] ;  [2] ; ;  [3]
  1. Department of Physics and Astronomy, University of California, Los Angeles, CA 90095-1562 (United States)
  2. Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago (Chile)
  3. Steward Observatory, University of Arizona, Tucson, AZ (United States)
Publication Date:
OSTI Identifier:
22518963
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 806; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTEROIDS; COOLING; COSMIC DUST; DETECTION; EMISSION SPECTRA; INFRARED SPECTRA; IRRADIATION; PLANETS; RESOLUTION; STELLAR ATMOSPHERES; WHITE DWARF STARS