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Title:
Cool Customers in the Stellar Graveyard. I. Limits to Extrasolar Planets Around the White Dwarf G29-38
Authors:
Debes, John H.; Sigurdsson, Steinn; Woodgate, Bruce E.
Affiliation:
AA(Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802.), AB(Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802.), AC(NASA Goddard Space Flight Center, Greenbelt, MD 27710.)
Publication:
The Astrophysical Journal, Volume 633, Issue 2, pp. 1168-1174. (ApJ Homepage)
Publication Date:
11/2005
Origin:
UCP
ApJ Keywords:
Stars: Circumstellar Matter, Stars: Planetary Systems, Stars: Individual: Alphanumeric: G29-38, Stars: White Dwarfs
DOI:
10.1086/491640
Bibliographic Code:
2005ApJ...633.1168D

Abstract

We present high-contrast images of the hydrogen white dwarf G29-38 taken in the near-infrared with the Hubble Space Telescope and the Gemini North Telescope as part of a high-contrast imaging search for substellar objects in orbit around nearby white dwarfs. We review the current limits on planetary companions for G29-38, the only nearby white dwarf with an infrared excess due to a dust disk. We add our recent observations to these limits to produce extremely tight constraints on the types of possible companions that could be present. No objects >6MJ are detected in our data at projected separations >12 AU, and no objects >16MJ are detected for separations from 3 to 12 AU, assuming a total system age of 1 Gyr. Limits for companions at separations <3 AU come from a combination of Two Micron All Sky Survey (2MASS) photometry and previous studies of G29-38's pulsations. Our imaging with Gemini cannot confirm a tentative claim for the presence of a low-mass brown dwarf. These observations demonstrate that a careful combination of several techniques can probe nearby white dwarfs for large planets and low-mass brown dwarfs.

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