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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 448298.0, MPI für Astronomie / Publikationen_mpia
Water, methane, and carbon dioxide present in the dayside spectrum of the exoplanet HD 209458b
Authors:Swain, M. R.; Tinetti, G.; Vasisht, G.; Deroo, P.; Griffith, C.; Bouwman, J.; Chen, Pin; Yung, Y.; Burrows, A.; Brown, L. R.; Matthews, J.; Rowe, J. F.; Kuschnig, R.; Angerhausen, D.
Date of Publication (YYYY-MM-DD):2009
Title of Journal:The Astrophysical Journal
Journal Abbrev.:ApJ
Issue / Number:2
Start Page:1616
End Page:1621
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Using the NICMOS instrument on the Hubble Space Telescope, we have measured the dayside spectrum of HD 209458b between 1.5 and 2.5 μm. The emergent spectrum is dominated by features due to the presence of methane (CH4) and water vapor (H2O), with smaller contributions from carbon dioxide (CO2). Combining this near-infrared spectrum with existing mid-infrared measurements shows the existence of a temperature inversion and confirms the interpretation of previous photometry measurements. We find a family of plausible solutions for the molecular abundance and detailed temperature profile. Observationally resolving the ambiguity between abundance and temperature requires either (1) improved wavelength coverage or spectral resolution of the dayside emission spectrum or (2) a transmission spectrum where abundance determinations are less sensitive to the temperature structure.
Free Keywords:planetary systems; techniques: spectroscopic
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL: [ID No:1]
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