Equilibrium chemistry in a brown dwarf's atmosphere

Cesium in Gliese 229B

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The distribution of Cs in Gliese 229B's atmosphere reveals how equilibrium chemistry establishes the atmospheric composition. The rapid kinetics of cesium chemistry keeps the Cs abundance in thermochemical equilibrium and renders Cs a sensitive measure of chemical processes in brown dwarf atmospheres. Observations of Gliese 229B indicate a subsolar bulk abundance of Cs, the depletion of alkali metals in the upper atmosphere from condensation, and a partitioning of heavy elements different from that of the Sun.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume532
Issue number1 PART 2
StatePublished - Mar 20 2000
Externally publishedYes

Fingerprint

cesium
chemistry
atmospheric composition
atmospheres
alkali metal
atmosphere
upper atmosphere
heavy elements
chemical process
alkali metals
condensation
depletion
partitioning
kinetics
distribution

Keywords

  • Infrared: stars
  • Planets and satellites: general
  • Stars: atmospheres
  • Stars: individual (Gliese 229B)
  • Stars: low-mass, brown dwarfs

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Equilibrium chemistry in a brown dwarf's atmosphere : Cesium in Gliese 229B. / Griffith, Caitlin; Yelle, Roger.

In: Astrophysical Journal, Vol. 532, No. 1 PART 2, 20.03.2000.

Research output: Contribution to journalArticle

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abstract = "The distribution of Cs in Gliese 229B's atmosphere reveals how equilibrium chemistry establishes the atmospheric composition. The rapid kinetics of cesium chemistry keeps the Cs abundance in thermochemical equilibrium and renders Cs a sensitive measure of chemical processes in brown dwarf atmospheres. Observations of Gliese 229B indicate a subsolar bulk abundance of Cs, the depletion of alkali metals in the upper atmosphere from condensation, and a partitioning of heavy elements different from that of the Sun.",
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T1 - Equilibrium chemistry in a brown dwarf's atmosphere

T2 - Cesium in Gliese 229B

AU - Griffith, Caitlin

AU - Yelle, Roger

PY - 2000/3/20

Y1 - 2000/3/20

N2 - The distribution of Cs in Gliese 229B's atmosphere reveals how equilibrium chemistry establishes the atmospheric composition. The rapid kinetics of cesium chemistry keeps the Cs abundance in thermochemical equilibrium and renders Cs a sensitive measure of chemical processes in brown dwarf atmospheres. Observations of Gliese 229B indicate a subsolar bulk abundance of Cs, the depletion of alkali metals in the upper atmosphere from condensation, and a partitioning of heavy elements different from that of the Sun.

AB - The distribution of Cs in Gliese 229B's atmosphere reveals how equilibrium chemistry establishes the atmospheric composition. The rapid kinetics of cesium chemistry keeps the Cs abundance in thermochemical equilibrium and renders Cs a sensitive measure of chemical processes in brown dwarf atmospheres. Observations of Gliese 229B indicate a subsolar bulk abundance of Cs, the depletion of alkali metals in the upper atmosphere from condensation, and a partitioning of heavy elements different from that of the Sun.

KW - Infrared: stars

KW - Planets and satellites: general

KW - Stars: atmospheres

KW - Stars: individual (Gliese 229B)

KW - Stars: low-mass, brown dwarfs

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M3 - Article

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JO - Astrophysical Journal

JF - Astrophysical Journal

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