Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21741805b&link_type=abstract
American Astronomical Society, AAS Meeting #217, #418.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The HR 8799 planetary system provides a unique opportunity to study the atmospheric properties of three young, coeval, planets at the extreme high-mass range of planet formation. We will compare broad-band near-IR spectra of the two outermost planets, c and b, to model atmospheres. In addition to their bulk properties (effective temperature, surface gravity, and size), the level of cloud coverage and departure from a chemical equilibrium CO/CH4 ratio will be discussed. Our effective temperature estimates also disagree, by several hundred Kelvin, with standard interior cooling-track predictions for the estimated age and measured luminosities of these planets. Possible sources of this disagreement will be presented.
Barman Travis S.
Konopacky Quinn
Macintosh Bruce
Marois Christian
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