Keck Speckle Imaging of the White Dwarf G29-38: No Brown Dwarf Companion Detected

Details Keck Speckle Imaging of the White Dwarf G29-38: No Brown Dwarf Companion Detected Keck Speckle Imaging of the White Dwarf G29-38: No Brown Dwarf Companion Detected

2000-02-02

arxiv.org/abs/astro-ph/0002039v1

ApJ (1998) 508, L81

Astronomy and Astrophysics

Astrophysics

7 pages, 2 figures

Scientific paper

10.1086/311725

The white dwarf Giclas 29-38 has attracted much attention due to its large infrared excess and the suggestion that excess might be due to a companion brown dwarf. We observed this object using speckle interferometry at the Keck telescope, obtaining diffraction-limited resolution (55 milliarcseconds) at K band, and found it unresolved. Assuming the entire K band excess is due to a single point-like companion, we place an upper limit on the binary separation of 30 milliarcseconds, or 0.42 AU at the star's distance of 14.1 pc. This result, combined with astroseismological data and other images of G29-38, supports the hypothesis that the source of the near-infrared excess is not a cool companion but a dust cloud.

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