On the presence of water and global circulation in the transiting planet HD 189733b

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

Detailed models are compared to recent infrared observations of the nearby extrasolar planet HD 189733b. It is demonstrated that atmospheric water is present and that the planet's day side has a nonisothermal structure down to gas pressures of -0.1 bars. Furthermore, model spectra with different amounts of CO are compared to the observations and an atmosphere absent of CO is excluded at roughly 2 σ. Constraining the CO concentration beyond that is unfortunately not possible with the current Spitzer photometry. However, radically enhanced (or depleted) metal abundances are unlikely and the basic composition of this planet is probably similar to that of its host star. When combined with Spitzer observations, a recent ground-based upper limit for the K-band dayside flux allows one to estimate the day-to-night energy redistribution efficiency to be ∼430/0.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume676
Issue number1 PART 2
DOIs
StatePublished - 2008
Externally publishedYes

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water circulation
planets
planet
extrasolar planets
extremely high frequencies
energy efficiency
night
water
gas pressure
photometry
atmospheres
stars
atmosphere
metal
estimates
gas
metals
energy

Keywords

  • Planetary systems
  • Radiative transfer
  • Stars: individual (HD 189733)

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

On the presence of water and global circulation in the transiting planet HD 189733b. / Barman, Travis S.

In: Astrophysical Journal, Vol. 676, No. 1 PART 2, 2008.

Research output: Contribution to journalArticle

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