2012ApJ...750...74S


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.25CET06:00:18

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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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 2MASSI J0423485-041403 BD* 04 23 48.5838371891 -04 14 03.228116841           L6.5+T2 107 0
2 HD 42581B BD* 06 10 34.80 -21 52 00.0           T6.5 465 0
3 UGPS J072227.51-054031.2 BD* 07 22 27.51096 -05 40 31.2096           T9 63 0
4 2MASS J10210969-0304197 BD* 10 21 09.69240 -03 04 19.7904           T1+T4 67 0
5 NAME Kelu-1 BD* 13 05 40.1737206066 -25 41 05.830344467         16.85 L2+L3.5 238 0
6 GJ 570 D BD* 14 57 14.96256 -21 21 47.7504           T8 196 1
7 WISE J154151.65-225024.9 BD* 15 41 51.65976 -22 50 24.9936           Y0 44 0
8 WISE J173835.53+273259.0 BD* 17 38 35.53440 +27 32 59.0964           Y0 47 0
9 * eps Ind PM* 22 03 21.6542294981 -56 47 09.537018193   5.75 4.69     K5V 481 0
10 * eps Ind B BD* 22 04 10.52064 -56 46 57.7452     24.12 20.8 15.60 T1V+T6V 134 2
11 HD 218396 El* 23 07 28.7156905667 +21 08 03.302133882   6.21 5.953     F0+VkA5mA5 916 0

    Equat.    Gal    SGal    Ecl

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2020.11.25-06:00:18

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