Spectral and Kinematic Analysis of a New Population of Young Brown Dwarfs

Details Spectral and Kinematic Analysis of a New Population of Young Brown Dwarfs Spectral and Kinematic Analysis of a New Population of Young Brown Dwarfs

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.9601c&link_type=abstract

American Astronomical Society Meeting 210, #96.01; Bulletin of the American Astronomical Society, Vol. 39, p.225

Astronomy and Astrophysics

Astronomy

Scientific paper

We have recently reported the discovery of a population of 50 late-M and L field dwarfs with unusual spectral features that we attribute to low gravity. These objects are likely to be uncommonly young, low-mass brown dwarfs. Spectral indices of gravity sensitive atomic and molecular features (e.g., VO, FeH, Na) visible in the optical and near-infrared are analyzed thus quantifying our previously qualitative spectral analysis. Since many of these new-found young objects have southerly declinations and distance estimates within 60 parsecs, we hypothesize that they belong to the nearby, intermediate-age (5-50 Myr), loose associations such as Tucana/Horologium, the TW Hydrae association, and the β Pictoris moving group. We discuss the possibility of kinematic membership in these groups based on new proper motion measurements from the CPAPIR camera on the CTIO 1.5m telescope.

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