A candidate substellar companion to CD -33°7795 (TWA 5)

Patrick J. Lowrance; Chris McCarthy; E. E. Becklin; B. Zuckerman; Glenn Schneider; R. A. Webb; Dean C. Hines; J. Davy Kirkpatrick; David W. Koerner; Frank Low; Roland Meier; Marcia Rieke; Bradford A. Smith; Richard J. Terrile; Rodger I. Thompson

A candidate substellar companion to CD -33°7795 (TWA 5)

Patrick J. Lowrance, Chris McCarthy, E. E. Becklin, B. Zuckerman, Glenn Schneider, R. A. Webb, Dean C. Hines, J. Davy Kirkpatrick, David W. Koerner, Frank Low, Roland Meier, Marcia Rieke, Bradford A. Smith, Richard J. Terrile, Rodger I. Thompson

Physics and Astronomy

Research output: Contribution to journal › Article

101 Scopus citations

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″ from the TW Hydrae association member CD -33°7795 (TWA 5), and the photometry implies a spectral type M8-M8.5, with a temperature of ∼2600 K. We estimate that the probability of a chance alignment with a background object of this nature is less than 2 × 10^-5 and therefore postulate that 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 ≈20M_Jup for TWA 5B.

Original language	English (US)
Pages (from-to)	L69-L72
Journal	Astrophysical Journal
Volume	512
Issue number	1 PART 2
State	Published - Feb 10 1999

Keywords

Stars: Low-mass, brown dwarfs

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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Lowrance, P. J., McCarthy, C., Becklin, E. E., Zuckerman, B., Schneider, G., Webb, R. A., Hines, D. C., Kirkpatrick, J. D., Koerner, D. W., Low, F., Meier, R., Rieke, M., Smith, B. A., Terrile, R. J., & Thompson, R. I. (1999). A candidate substellar companion to CD -33°7795 (TWA 5). Astrophysical Journal, 512(1 PART 2), L69-L72.

A candidate substellar companion to CD -33°7795 (TWA 5). / Lowrance, Patrick J.; McCarthy, Chris; Becklin, E. E.; Zuckerman, B.; Schneider, Glenn; Webb, R. A.; Hines, Dean C.; Kirkpatrick, J. Davy; Koerner, David W.; Low, Frank; Meier, Roland; Rieke, Marcia; Smith, Bradford A.; Terrile, Richard J.; Thompson, Rodger I.

In: Astrophysical Journal, Vol. 512, No. 1 PART 2, 10.02.1999, p. L69-L72.

Research output: Contribution to journal › Article

Lowrance, Patrick J. ; McCarthy, Chris ; Becklin, E. E. ; Zuckerman, B. ; Schneider, Glenn ; Webb, R. A. ; Hines, Dean C. ; Kirkpatrick, J. Davy ; Koerner, David W. ; Low, Frank ; Meier, Roland ; Rieke, Marcia ; Smith, Bradford A. ; Terrile, Richard J. ; Thompson, Rodger I. / A candidate substellar companion to CD -33°7795 (TWA 5). In: Astrophysical Journal. 1999 ; Vol. 512, No. 1 PART 2. pp. L69-L72.

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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″ from the TW Hydrae association member CD -33°7795 (TWA 5), and the photometry implies a spectral type M8-M8.5, with a temperature of ∼2600 K. We estimate that the probability of a chance alignment with a background object of this nature is less than 2 × 10-5 and therefore postulate that 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 ≈20MJup for TWA 5B.",

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AU - Lowrance, Patrick J.

AU - McCarthy, Chris

AU - Becklin, E. E.

AU - Zuckerman, B.

AU - Schneider, Glenn

AU - Webb, R. A.

AU - Hines, Dean C.

AU - Kirkpatrick, J. Davy

AU - Koerner, David W.

AU - Low, Frank

AU - Meier, Roland

AU - Rieke, Marcia

AU - Smith, Bradford A.

AU - Terrile, Richard J.

AU - Thompson, Rodger I.

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AB - 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″ from the TW Hydrae association member CD -33°7795 (TWA 5), and the photometry implies a spectral type M8-M8.5, with a temperature of ∼2600 K. We estimate that the probability of a chance alignment with a background object of this nature is less than 2 × 10-5 and therefore postulate that 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 ≈20MJup for TWA 5B.

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