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Discovery of Seven T Tauri Stars and a Brown Dwarf Candidatein the Nearby TW Hydrae Association
Open accessAbstract
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 ~10 7 yr, implies a mass ~20 M Jup .
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Citations
Cited by
Search for associations containing young stars (SACY): I. Sample and searching method
Torres, C. A. O., Quast, G. R., da Silva, L., de la Reza, R., Melo, C. H. F., & Sterzik, M. (2006) · Astronomy & Astrophysics · doi:10.1051/0004-6361:20065602 · Cited by 632
Zuckerman, B., & Song, I. (2004) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev.astro.42.053102.134111 · Cited by 594
Self-citationRapid Formation of Molecular Clouds and Stars in the Solar Neighborhood
Hartmann, L., Ballesteros‐Paredes, J., & Bergin, E. A. (2001) · The Astrophysical Journal · doi:10.1086/323863 · Cited by 567
Post–T Tauri Stars in the Nearest OB Association
Mamajek, E. E., Meyer, M. R., & Liebert, J. (2002) · The Astronomical Journal · doi:10.1086/341952 · Cited by 310
A Moving Cluster Distance to the Exoplanet 2M1207b in the TW Hydrae Association
Mamajek, E. E. (2005) · The Astrophysical Journal · doi:10.1086/468181 · Cited by 232
“Gizis (2002) discovered 2M1207 in a spectroscopic survey of red 2MASS sources, and claimed that the object was a ∼10 Myr-old, ∼25MJup member of the nearby (∼55 pc) TW Hya association (TWA; Webb et al. 1999b).”
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Metadata
- Authors
- Webb, R. A., Zuckerman, B., Platais, I., Patience, J., White, R. J., Schwartz, M. J., & McCarthy, C.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1999-02-10
- Volume
- 512
- Issue
- 1
- Pages
- L63-L67
- ISSN
- 0004-637X (ISSN-L)
- OpenAlex
- W2069199724
- Cited by
- 397
- References
- 0
- FWCI
- 16.00
- Type
- journal article
- Language
- en
- Open access
- bronze
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- 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 Candidatein the Nearby TW Hydrae Association. The Astrophysical Journal. https://doi.org/10.1086/311856
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