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 journalArticle

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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.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume512
Issue number1 PART 2
StatePublished - Feb 10 1999
Externally publishedYes

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coronagraphs
axioms
Hubble Space Telescope
photometry
spatial resolution
alignment
cooling
stars
sensitivity
estimates
temperature
youth
young

Keywords

  • Stars: Low-mass, brown dwarfs

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Lowrance, P. J., McCarthy, C., Becklin, E. E., Zuckerman, B., Schneider, G., Webb, R. A., ... Thompson, R. I. (1999). A candidate substellar companion to CD -33°7795 (TWA 5). Astrophysical Journal, 512(1 PART 2).

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.

Research output: Contribution to journalArticle

Lowrance, PJ, McCarthy, C, Becklin, EE, Zuckerman, B, Schneider, G, Webb, RA, Hines, DC, Kirkpatrick, JD, Koerner, DW, Low, F, Meier, R, Rieke, M, Smith, BA, Terrile, RJ & Thompson, RI 1999, 'A candidate substellar companion to CD -33°7795 (TWA 5)', Astrophysical Journal, vol. 512, no. 1 PART 2.
Lowrance PJ, McCarthy C, Becklin EE, Zuckerman B, Schneider G, Webb RA et al. A candidate substellar companion to CD -33°7795 (TWA 5). Astrophysical Journal. 1999 Feb 10;512(1 PART 2).
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.
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AU - Schneider, Glenn

AU - Webb, R. A.

AU - Hines, Dean C.

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AU - Koerner, David W

AU - Low, Frank

AU - Meier, Roland

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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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