Identifying the Missing Population of Nearby Young M Dwarfs

Details Identifying the Missing Population of Nearby Young M Dwarfs Identifying the Missing Population of Nearby Young M Dwarfs

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.1002s&link_type=abstract

American Astronomical Society Meeting 208, #10.02; Bulletin of the American Astronomical Society, Vol. 38, p.89

Astronomy and Astrophysics

Astronomy

Scientific paper

While there has been much recent progress in finding nearby solar-type stars in young moving groups (<100 Myr, <100 pc), such work has largely overlooked the much more numerous low-mass stars. By virtue of their large numbers, these “missing” M dwarfs represent an important population for understanding circumstellar disk evolution and planet formation, which in principle, could represent the most common hosts of planetary systems. We present Keck/HIRES spectra of 40 candidate young M dwarfs extracted from a novel search of the 2MASS+ROSAT catalogs. From the measured radial velocities and published proper motions and distances, we calculate space velocities (U, V, W) and attempt to establish their kinematic membership with known coeval moving groups. In addition, we measure the equivalent widths of known stellar activity indicators and determine a binary fraction of at least 25%. This work expands the census of young low-mass stars near Earth in this key epoch of 10 - 100 Myr, and is the necessary foundation to identify promising targets for intensive follow-up studies with ground-based AO, the Spitzer Space Telescope, and Gemini-South's coronographic planet search with NICI.

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