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

Travis S. Barman

doi:10.1086/587056

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

Travis S. Barman

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71 Scopus citations

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 language	English (US)
Pages (from-to)	L61-L64
Journal	Astrophysical Journal
Volume	676
Issue number	1 PART 2
DOIs	https://doi.org/10.1086/587056
State	Published - 2008

Keywords

Planetary systems
Radiative transfer
Stars: individual (HD 189733)

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/587056

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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.",

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AU - Barman, Travis S.

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N2 - 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.

AB - 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.

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KW - Radiative transfer

KW - Stars: individual (HD 189733)

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

Abstract

Keywords

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