Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2012-02-28
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
37 pages, 13 figures. Accepted for publication in the Astrophysical J
Scientific paper
We present new cloudy and cloudless model atmospheres for brown dwarfs using recent ab initio calculations of the line list of ammonia (NH3) and of the collision-induced absorption of molecular hydrogen (H2). We compare the new synthetic spectra with models based on an earlier description of the H2 and NH3 opacities. We find a significant improvement in fitting the nearly complete spectral energy distribution of the T7p dwarf Gliese 570D and in near infrared color-magnitude diagrams of field brown dwarfs. We apply these new models to the identification of NH3 absorption in the H band peak of very late T dwarfs and the new Y dwarfs and discuss the observed trend in the NH3-H spectral index. The new NH3 line list also allows a detailed study of the medium resolution spectrum of the T9/T10 dwarf UGPS J072227.51-054031.2 where we identify several specific features caused by NH3.
Abel Markus
Freedman Richard Stuart
Frommhold Lothar
Marley Mark S.
Saumon Didier
No associations
LandOfFree
New H2 collision-induced absorption and NH3 opacity and the spectra of the coolest brown dwarfs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with New H2 collision-induced absorption and NH3 opacity and the spectra of the coolest brown dwarfs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and New H2 collision-induced absorption and NH3 opacity and the spectra of the coolest brown dwarfs will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-612571