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

Marc J. Kuchner | Zendy; C. Koresko | Zendy; Michael E. Brown | Zendy

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

Author(s) -

Marc J. Kuchner,

C. Koresko,

Michael E. Brown

Publication year - 1998

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/311725

Subject(s) - brown dwarf , physics , white dwarf , speckle imaging , speckle pattern , astrophysics , interferometry , infrared , astronomy , telescope , optics , stars

The white dwarf Giclas 29-38 has attracted much attention due to its largeinfrared excess and the suggestion that excess might be due to a companionbrown dwarf. We observed this object using speckle interferometry at the Kecktelescope, obtaining diffraction-limited resolution (55 milliarcseconds) at Kband, and found it unresolved. Assuming the entire K band excess is due to asingle point-like companion, we place an upper limit on the binary separationof 30 milliarcseconds, or 0.42 AU at the star's distance of 14.1 pc. Thisresult, combined with astroseismological data and other images of G29-38,supports the hypothesis that the source of the near-infrared excess is not acool companion but a dust cloud.Comment: 7 pages, 2 figure

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