Spitzer Observations of Unusually Red and Blue L Dwarfs

Details Spitzer Observations of Unusually Red and Blue L Dwarfs Spitzer Observations of Unusually Red and Blue L Dwarfs

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743410g&link_type=abstract

American Astronomical Society, AAS Meeting #217, #434.10; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present Spitzer/IRAC measurements of a sample of unusually red and unusually blue L dwarfs, sources which are believed to have extreme cloud properties, surface gravities and/or metallicities. This sample includes a handful of L subdwarfs with halo kinematics. We compare the mid- and near-infrared colors of these sources to normal field L dwarfs, noting trends in surface gravity and metallicity. We also present Spitzer/IRS spectra of the unusually blue L dwarf 2MASS 1126-5003, in which the 8-10 micron silicate grain feature is weak or absent. This is consistent with the interpretation that this source has unusually thin or patchy photospheric clouds.

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