Possible Age Effects on Brown Dwarf Spectral Features in the Near-Infrared

Details Possible Age Effects on Brown Dwarf Spectral Features in the Near-Infrared Possible Age Effects on Brown Dwarf Spectral Features in the Near-Infrared

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...207.6814s&link_type=abstract

American Astronomical Society Meeting 207, #68.14; Bulletin of the American Astronomical Society, Vol. 37, p.1268

Astronomy and Astrophysics

Astronomy

Scientific paper

We report the initial results of a study comparing the far-red optical and near-infrared spectra of 53 nearby L dwarfs. Our aim is to characterize the near-infrared discrepancies found among objects of the same optical spectral type and determine their causes. We show near-infrared spectra of L dwarfs with varying strengths of collision-induced H2 absorption (H2 CIA) as evidenced by a `peaky' shape in the H band and redder (J-H) and (J-Ks) colors. H2 CIA is very pressure-sensitive and, as such, is an indicator of gravity and, in turn, age, as recently proposed by Kirkpatrick et al. (2005). Our findings are evidence that gravity is a significant factor in the near-infrared spectral classification of L dwarfs, suggesting a possible new method with which to infer information about a brown dwarf's age and mass.

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