A Candidate Substellar Companion to CoD -33 7795 (TWA 5)

P. J. Lowrance; C. McCarthy; E. E. Becklin; B. Zuckerman; G. Schneider; R. A. Webb; D. C. Hines; J. D. Kirkpatrick; D. W. Koerner; F. Low; R. Meier; M. Rieke; B. A. Smith; R. J. Terrile; R. I. Thompson

doi:10.1086/311858

arXiv · astro-ph/9812187

A Candidate Substellar Companion to CoD -33 7795 (TWA 5)

P. J. Lowrance·C. McCarthy·E. E. Becklin·B. Zuckerman·G. Schneider·R. A. Webb·D. C. Hines·J. D. Kirkpatrick·D. W. Koerner·F. Low·R. Meier·M. Rieke·B. A. Smith·R. J. Terrile·R. I. Thompson

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Abstract

We present the discovery of a candidate substellar object in a survey of young stars in the solar vicinity using the sensitivity and spatial resolution afforded by the NICMOS coronagraph on the Hubble Space Telescope. The H=12.1 mag object was discovered approximately 2 arcsec from the TW Hydrae Association member CoD -33 7795 (TWA 5), and the photometry implies a spectral type M8-M8.5, with a temperature of approximately 2600K. We estimate that the probability of a chance alignment with a background objectof this nature is < 2 X 10^(-5), and therefore postulate the object (TWA 5B) is physically associated at 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 20 Jupiter masses for TWA 5B.

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P. J. Lowrance, C. McCarthy, E. E. Becklin, B. Zuckerman, G. Schneider, R. A. Webb, D. C. Hines, J. D. Kirkpatrick, D. W. Koerner, F. Low, R. Meier, M. Rieke, B. A. Smith, R. J. Terrile, R. I. Thompson. 1998-12-09. A Candidate Substellar Companion to CoD -33 7795 (TWA 5). https://doi.org/10.1086/311858

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