Discovery of seven T Tauri stars and a brown dwarf candidate in the nearby TW Hydrae Association

R. A. Webb, B. Zuckerman, I. Platais, Jennifer Patience, R. J. White, M. J. Schwartz, C. McCarthy

Research output: Contribution to journalArticle

310 Citations (Scopus)

Abstract

We report the discovery of five T Tauri star systems, two of which are resolved binaries, in the vicinity of the nearest known region of recent star formation: the TW Hydrae Association. The newly discovered systems display the same signatures of youth (namely high X-ray flux, large Li abundance, and strong chromospheric activity) and the same proper motion as the original five members. These similarities firmly establish the group as a bona fide T Tauri association, unique in its proximity to Earth and its complete isolation from any known molecular clouds. At an age of ∼10 Myr and a distance of ∼50 pc, the association members are excellent candidates for future studies of circumstellar disk dissipation and the formation of brown dwarfs and planets. Indeed, as an example, our speckle imaging revealed a faint, very likely companion 2″ north of CD -33° 7795 (TWA 5). Its color and brightness suggest a spectral type of ∼M8.5 which, at an age of ∼107 yr, implies a mass ∼20MJup.

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

Fingerprint

T Tauri stars
proper motion
display devices
molecular clouds
proximity
star formation
planets
isolation
brightness
dissipation
signatures
color
speckle
x rays
planet
youth

Keywords

  • Open clusters and associations: Individual (TW Hydrae)
  • Stars: Low-mass, brown dwarfs
  • Stars: Pre-main-sequence
  • X-rays: Stars

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Webb, R. A., Zuckerman, B., Platais, I., Patience, J., White, R. J., Schwartz, M. J., & McCarthy, C. (1999). Discovery of seven T Tauri stars and a brown dwarf candidate in the nearby TW Hydrae Association. Astrophysical Journal, 512(1 PART 2).

Discovery of seven T Tauri stars and a brown dwarf candidate in the nearby TW Hydrae Association. / Webb, R. A.; Zuckerman, B.; Platais, I.; Patience, Jennifer; White, R. J.; Schwartz, M. J.; McCarthy, C.

In: Astrophysical Journal, Vol. 512, No. 1 PART 2, 10.02.1999.

Research output: Contribution to journalArticle

Webb, RA, Zuckerman, B, Platais, I, Patience, J, White, RJ, Schwartz, MJ & McCarthy, C 1999, 'Discovery of seven T Tauri stars and a brown dwarf candidate in the nearby TW Hydrae Association', Astrophysical Journal, vol. 512, no. 1 PART 2.
Webb RA, Zuckerman B, Platais I, Patience J, White RJ, Schwartz MJ et al. Discovery of seven T Tauri stars and a brown dwarf candidate in the nearby TW Hydrae Association. Astrophysical Journal. 1999 Feb 10;512(1 PART 2).
Webb, R. A. ; Zuckerman, B. ; Platais, I. ; Patience, Jennifer ; White, R. J. ; Schwartz, M. J. ; McCarthy, C. / Discovery of seven T Tauri stars and a brown dwarf candidate in the nearby TW Hydrae Association. In: Astrophysical Journal. 1999 ; Vol. 512, No. 1 PART 2.
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AU - Platais, I.

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AU - McCarthy, C.

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