Searching for Young Nearby Stars

Details Searching for Young Nearby Stars Searching for Young Nearby Stars

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.8702s&link_type=abstract

American Astronomical Society, 198th AAS Meeting, #87.02; Bulletin of the American Astronomical Society, Vol. 33, p.914

Biology

3

Scientific paper

Nearby young stars are excellent targets for direct imaging of cooling planets because young giant planets are hot (hence bright at near infrared wavelengths) in youth. We are involved in a long term project to find the youngest and closest stars to Earth by using X-ray (RASS) and astrometric (Hipparcos and Tycho) catalogs. We generated a list contaning of order 1000 very young stars candidates scattered around the sky and within ~60 pc of Earth. In January 2001, with the 2.3 m telescope at Siding Spring Observatory in Austrlia, we found that about 20 candidates are indeed very young, i.e. showing strong Hα emission and Li 6708Å absorption. In particular, we found the closest T Tauri stars known to date, HIP 23309 (26 pc) and HIP 29964 (38 pc). These stars share the same space motion as β Pictoris, the famous nearby star with a very prominent protoplanetary disk. We estimate the age of all three stars as 15+/- 5 Myrs. We are observing northern hemisphere stars with the Hamilton echelle on the 3 m telescope at Lick Observatory. This research was supported in part by the UCLA Astrobiology Institute and by a NASA grant to UCLA.

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