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Infrared spectroscopy, imaging, and 10 micron photometry of Giclas 29-38An NIR spectrum and several images of Giclas 29-38, a white dwarf suspected to have a brown dwarf in orbit around it, are presented. There is no absorption feature in the spectrum that is deeper than 5 percent in the wavelength range 1.95-2.45 microns, from which it is inferred that there is no feature deeper than 10 percent at 2.4 microns from any brown dwarf companion. The IR spectrum does not yield any strong constraint on whether or not the thermal emission observed from G29-38 comes from a brown dwarf or dust. The 1.6- and 2.2-micron images of G29-38 appear indistinguishable from a point source with an upper limit of 0.4 arcsec for the separation of the white dwarf and the source of the excess IR emission. This corresponds to a projected linear separation of 5.6 AU. A 2sigma limit at 10 microns of 10 mJy constrains possible alternative models for the IR excess by emission from dust grains. While the present results do not show evidence for the suspected brown dwarf companion around G29-38, the presence of such an object cannot be ruled out.
Document ID
19880066143
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Tokunaga, A. T.
(Hawaii Univ. Honolulu, HI, United States)
Hodapp, K.-W.
(Hawaii Univ. Honolulu, HI, United States)
Becklin, E. E.
(Hawaii Univ. Honolulu, HI, United States)
Cruikshank, D. P.
(Hawaii Univ. Honolulu, HI, United States)
Rigler, M.
(Hawaii Univ. Honolulu, HI, United States)
Toomey, D.
(Hawaii, University Honolulu, United States)
Brown, R. H.
(California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)
Date Acquired
August 13, 2013
Publication Date
September 15, 1988
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 332
ISSN: 0004-637X
Subject Category
Astronomy
Accession Number
88A53370
Funding Number(s)
CONTRACT_GRANT: NASW-3159
CONTRACT_GRANT: NSF AST-83-18342
Distribution Limits
Public
Copyright
Other

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