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

doi:10.1086/311858

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

Research output: Contribution to journal › Article › peer-review

104 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
DOIs	https://doi.org/10.1086/311858
State	Published - Feb 10 1999
Externally published	Yes

Keywords

Stars: Low-mass, brown dwarfs

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/311858

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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 › peer-review

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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title = "A candidate substellar companion to CD -33°7795 (TWA 5)",

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.",

keywords = "Stars: Low-mass, brown dwarfs",

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

note = "Funding Information: This work is supported in part by NASA grants NAG5-4688 to UCLA and NAG5-3042 to the University of Arizona NIC-MOS Instrument Design Team. This Letter is based on observations obtained with the NASA/ESA Hubble Space Telescope at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS5-26555. Some of the data presented herein were obtained at the W. M. Keck Observatory. We would like to thank R. White, A. Weinberger, and D. Weintraub for their valuable comments and the anonymous referee for comments which clarified the presentation.",

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AU - Zuckerman, B.

AU - Schneider, Glenn

AU - Webb, R. A.

AU - Hines, Dean C.

AU - Kirkpatrick, J. Davy

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AU - Rieke, Marcia

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AU - Terrile, Richard J.

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N1 - Funding Information: This work is supported in part by NASA grants NAG5-4688 to UCLA and NAG5-3042 to the University of Arizona NIC-MOS Instrument Design Team. This Letter is based on observations obtained with the NASA/ESA Hubble Space Telescope at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS5-26555. Some of the data presented herein were obtained at the W. M. Keck Observatory. We would like to thank R. White, A. Weinberger, and D. Weintraub for their valuable comments and the anonymous referee for comments which clarified the presentation.

PY - 1999/2/10

Y1 - 1999/2/10

N2 - 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.

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

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