The Atmospheres and Evolution of Young Brown Dwarf/Planetary-Mass Companions

Details The Atmospheres and Evolution of Young Brown Dwarf/Planetary-Mass Companions The Atmospheres and Evolution of Young Brown Dwarf/Planetary-Mass Companions

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.4016k&link_type=abstract

American Astronomical Society, ESS meeting #2, #40.16

Astronomy and Astrophysics

Astronomy

Scientific paper

We present VLT\SINFONI JHK spectra of a set of young, low-mass brown dwarf and planetary-mass companions and a comparison with more evolved substellar companions and several theoretical model atmospheres. In the study of cool atmospheres, these low-mass companions to nearby young stars are particularly valuable since the primary provides constraints on the distance to and age of these low-mass objects, breaking the mass-age-luminosity degeneracy. Our sample consists of the lowest mass imaged companions with ages of 2-30 Myr and estimated masses of 5-25 MJup. These companions represent the lowest mass objects in the 2-30 Myr age range for which it is possible to obtain high quality infrared spectra. A particularly interesting member of the sample is 2M1207b, a young L dwarf with an anomalously low luminosity. We explore possible scenarios to explain its observed spectrum.

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