L-band Spectroscopy of the New L Dwarf Spectral Sequence

Details L-band Spectroscopy of the New L Dwarf Spectral Sequence L-band Spectroscopy of the New L Dwarf Spectral Sequence

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..140g&link_type=abstract

NOAO Proposal ID #1999A-0140

Physics

Scientific paper

We propose to obtain low-resolution spectra from 2.4 to 4.2 microns for the new L dwarf class. These recently discovered brown dwarf candidates open the opportunity to probe the atmospheric physics of cool objects. In addition to their utility in determining the temperatures and bolometric corrections for the L dwarf spectral sequence, our proposed spectral observations are aimed at addressing two important issues of atmospheric physics. First, three micron observations will be more sensitive to the formation of methane than K-band observations. Second, grains are predicted to form in these cool atmospheres, and our observations will constrain the size and covering fraction through their effect on the water absorption bands.

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