Detection of abundant carbon monoxide in the brown dwarf Gliese 229B

Keith S. Noll; T. R. Geballe; Mark S. Marley

doi:10.1086/310954

Detection of abundant carbon monoxide in the brown dwarf Gliese 229B

Keith S. Noll, T. R. Geballe, Mark S. Marley

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106 Scopus citations

Abstract

We report the detection of carbon monoxide in the atmosphere of the brown dwarf Gliese 229B in spectra obtained at wavelengths near 4.7 μm. 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 CH₄ at low temperatures. The average flux from 4.55 to 5.10 μm in Gl 229B is measured to be 3.6 ± 0.2 mJy, lower than previous broadband measurements.

Original language	English (US)
Pages (from-to)	L87-L90
Journal	Astrophysical Journal
Volume	489
Issue number	1 PART II
DOIs	https://doi.org/10.1086/310954
State	Published - 1997
Externally published	Yes

Keywords

Infrared: stars
Stars: individual (Gliese 229B)
Stars: low-mass, brown dwarfs

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/310954

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title = "Detection of abundant carbon monoxide in the brown dwarf Gliese 229B",

abstract = "We report the detection of carbon monoxide in the atmosphere of the brown dwarf Gliese 229B in spectra obtained at wavelengths near 4.7 μm. 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 CH4 at low temperatures. The average flux from 4.55 to 5.10 μm in Gl 229B is measured to be 3.6 ± 0.2 mJy, lower than previous broadband measurements.",

keywords = "Infrared: stars, Stars: individual (Gliese 229B), Stars: low-mass, brown dwarfs",

author = "Noll, {Keith S.} and Geballe, {T. R.} and Marley, {Mark S.}",

year = "1997",

doi = "10.1086/310954",

language = "English (US)",

volume = "489",

pages = "L87--L90",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

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TY - JOUR

T1 - Detection of abundant carbon monoxide in the brown dwarf Gliese 229B

AU - Noll, Keith S.

AU - Geballe, T. R.

AU - Marley, Mark S.

PY - 1997

Y1 - 1997

N2 - We report the detection of carbon monoxide in the atmosphere of the brown dwarf Gliese 229B in spectra obtained at wavelengths near 4.7 μm. 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 CH4 at low temperatures. The average flux from 4.55 to 5.10 μm in Gl 229B is measured to be 3.6 ± 0.2 mJy, lower than previous broadband measurements.

AB - We report the detection of carbon monoxide in the atmosphere of the brown dwarf Gliese 229B in spectra obtained at wavelengths near 4.7 μm. 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 CH4 at low temperatures. The average flux from 4.55 to 5.10 μm in Gl 229B is measured to be 3.6 ± 0.2 mJy, lower than previous broadband measurements.

KW - Infrared: stars

KW - Stars: individual (Gliese 229B)

KW - Stars: low-mass, brown dwarfs

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U2 - 10.1086/310954

DO - 10.1086/310954

M3 - Article

AN - SCOPUS:21944441753

SN - 0004-637X

VL - 489

SP - L87-L90

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 PART II

ER -

Detection of abundant carbon monoxide in the brown dwarf Gliese 229B

Abstract

Keywords

ASJC Scopus subject areas

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