A Candidate Substellar Companion to CD −33°7795 (TWA 5) | Zendy

Patrick Lowrance | Zendy; C. McCarthy | Zendy; E. E. Becklin | Zendy; B. Zuckerman | Zendy; Glenn Schneider | Zendy; R. A. Webb | Zendy; Dean C. Hines | Zendy; J. Davy Kirkpatrick | Zendy; D. W. Koerner | Zendy; F. J. Low | Zendy; Roland Meier | Zendy; Marcia Rieke | Zendy; B. A. Smith | Zendy; R. J. Terrile | Zendy; Rodger I. Thompson | Zendy

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A Candidate Substellar Companion to CD −33°7795 (TWA 5)

Author(s) -

Patrick Lowrance,

C. McCarthy,

E. E. Becklin,

B. Zuckerman,

Glenn Schneider,

R. A. Webb,

Dean C. Hines,

J. Davy Kirkpatrick,

D. W. Koerner,

F. J. Low,

Roland Meier,

Marcia Rieke,

B. A. Smith,

R. J. Terrile,

Rodger I. Thompson

Publication year - 1999

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 - 10.1086/311858

Subject(s) - brown dwarf , photometry (optics) , physics , stars , coronagraph , astronomy , astrophysics , hubble space telescope , stellar classification , exoplanet

We present the discovery of a candidate substellar object in a survey ofyoung stars in the solar vicinity using the sensitivity and spatial resolutionafforded by the NICMOS coronagraph on the Hubble Space Telescope. The H=12.1mag object was discovered approximately 2 arcsec from the TW Hydrae Associationmember CoD -33 7795 (TWA 5), and the photometry implies a spectral typeM8-M8.5, with a temperature of approximately 2600K. We estimate that theprobability of a chance alignment with a background objectof this nature is < 2X 10^(-5), and therefore postulate the object (TWA 5B) is physically associatedat a projected separation of 100 AU. Given the likely youth of the primary (~10 Myr), current brown dwarf cooling models predict a mass of approximately 20Jupiter masses for TWA 5B.Comment: LATEX, 10 pages, 2 figures, accepted for publication in ApJ Letter

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