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American Astronomical Society, Astrophysical Journal, 1(541), p. 390-395, 2000

DOI: 10.1086/309437

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A Candidate Substellar Companion to HR 7329

Journal article published in 2000 by Patrick J. Lowrance, Glenn Schneider, J. Davy Kirkpatrick, E. E. Becklin, Alycia J. Weinberger ORCID, B. Zuckerman, Phil Plait, Eliot M. Malmuth, Sara R. Heap, A. Schultz, Bradford A. Smith, Richard J. Terrile, Dean C. Hines
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We present the discovery of a candidate substellar companion from a survey of nearby, young stars with the NICMOS coronagraph on the Hubble Space Telescope. The H ~ 12 mag object was discovered approximately 4" from the young A0V star HR 7329. Using follow-up spectroscopy from STIS, we derive a spectral type between M7V and M8V with an effective temperature of ~ 2600 K. We estimate that the probability of a chance alignment with a foreground dwarf star of this nature is ~ 10^(-8) and therefore suggest the object (HR 7329B) is physically associated with HR 7329 with a projected separation of 200 AU. Current brown dwarf cooling models indicate a mass of less than 50 Jupiter masses for HR 7329B based on age estimates of < 30 Myr for HR7329A. Comment: 8 pages LATEX, 5 ps figures, accepted for ApJ