Water, methane, and carbon dioxide present in the dayside spectrum of the exoplanet HD 209458b

M. R. Swain; G. Tinetti; G. Vasisht; P. Deroo; C. Griffith; J. Bouwman; Pin Chen; Y. Yung; Adam S. Burrows; L. R. Brown; J. Matthews; J. F. Rowe; R. Kuschnig; D. Angerhausen

doi:10.1088/0004-637X/704/2/1616

Water, methane, and carbon dioxide present in the dayside spectrum of the exoplanet HD 209458b

M. R. Swain, G. Tinetti, G. Vasisht, P. Deroo, C. Griffith, J. Bouwman, Pin Chen, Y. Yung, Adam S. Burrows, L. R. Brown, J. Matthews, J. F. Rowe, R. Kuschnig, D. Angerhausen

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215 Scopus citations

Abstract

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 (CH ₄) 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.

Original language	English (US)
Pages (from-to)	1616-1621
Number of pages	6
Journal	Astrophysical Journal
Volume	704
Issue number	2
DOIs	https://doi.org/10.1088/0004-637X/704/2/1616
State	Published - 2009

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

Planetary systems
Techniques: spectroscopic

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10.1088/0004-637X/704/2/1616

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Swain, M. R., Tinetti, G., Vasisht, G., Deroo, P., Griffith, C., Bouwman, J., Chen, P., Yung, Y., Burrows, A. S., Brown, L. R., Matthews, J., Rowe, J. F., Kuschnig, R., & Angerhausen, D. (2009). Water, methane, and carbon dioxide present in the dayside spectrum of the exoplanet HD 209458b. Astrophysical Journal, 704(2), 1616-1621. https://doi.org/10.1088/0004-637X/704/2/1616

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title = "Water, methane, and carbon dioxide present in the dayside spectrum of the exoplanet HD 209458b",

abstract = "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 (CH 4) 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.",

keywords = "Planetary systems, Techniques: spectroscopic",

author = "Swain, {M. R.} and G. Tinetti and G. Vasisht and P. Deroo and C. Griffith and J. Bouwman and Pin Chen and Y. Yung and Burrows, {Adam S.} and Brown, {L. R.} and J. Matthews and Rowe, {J. F.} and R. Kuschnig and D. Angerhausen",

year = "2009",

doi = "10.1088/0004-637X/704/2/1616",

language = "English (US)",

volume = "704",

pages = "1616--1621",

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TY - JOUR

T1 - Water, methane, and carbon dioxide present in the dayside spectrum of the exoplanet HD 209458b

AU - Swain, M. R.

AU - Tinetti, G.

AU - Vasisht, G.

AU - Deroo, P.

AU - Griffith, C.

AU - Bouwman, J.

AU - Chen, Pin

AU - Yung, Y.

AU - Burrows, Adam S.

AU - Brown, L. R.

AU - Matthews, J.

AU - Rowe, J. F.

AU - Kuschnig, R.

AU - Angerhausen, D.

PY - 2009

Y1 - 2009

N2 - 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 (CH 4) 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.

AB - 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 (CH 4) 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.

KW - Planetary systems

KW - Techniques: spectroscopic

UR - http://www.scopus.com/inward/record.url?scp=70549083820&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=70549083820&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/704/2/1616

DO - 10.1088/0004-637X/704/2/1616

M3 - Article

AN - SCOPUS:70549083820

SN - 0004-637X

VL - 704

SP - 1616

EP - 1621

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

ER -

Water, methane, and carbon dioxide present in the dayside spectrum of the exoplanet HD 209458b

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