SIMBAD references

2012ApJ...750...74S - Astrophys. J., 750, 74 (2012/May-1)

New H2Collision-induced absorption and NH3 opacity and the spectra of the coolest brown dwarfs.

SAUMON D., MARLEY M.S., ABEL M., FROMMHOLD L. and FREEDMAN R.S.

Abstract (from CDS):

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 NH3opacities. 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.

Abstract Copyright:

Journal keyword(s): brown dwarfs - opacity - stars: atmospheres

Simbad objects: 11

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2020.10.26-05:15:23

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