Detection of Abundant Carbon Monoxide in the Brown Dwarf Gliese 229B

Details Detection of Abundant Carbon Monoxide in the Brown Dwarf Gliese 229B Detection of Abundant Carbon Monoxide in the Brown Dwarf Gliese 229B

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...489l..87n&link_type=abstract

Astrophysical Journal Letters v.489, p.L87

Astronomy and Astrophysics

Astronomy

88

Infrared: Stars, Stars: Low-Mass, Brown Dwarfs, Stars: Individual Name: Gliese 229B

Scientific paper

We report the detection of carbon monoxide in the atmosphere of the brown dwarf Gliese 229B in spectra obtained at wavelengths near 4.7 mu m. The spectrum is consistent with mole fractions of CO of more than 50 parts per million (ppm), much higher than expected for gas in thermochemical equilibrium at the temperature of the atmosphere we observe. As in Jupiter, mixing in the upper atmosphere of Gl 229B may prevent equilibrium between CO and CH 4 at low temperatures. The average flux from 4.55 to 5.10 mu m in Gl 229B is measured to be 3.6+/-0.2 mJy, lower than previous broadband measurements.

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