Probing the terminator region atmosphere of the hot-jupiter xo-1b with transmission spectroscopy

G. Tinetti, P. Deroo, M. R. Swain, Caitlin Griffith, G. Vasisht, L. R. Brown, C. Burke, P. McCullough

Research output: Contribution to journalArticle

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Abstract

We report here the first infrared spectrum of the hot-Jupiter XO-1b. The observations were obtained with the NICMOS instrument on board the Hubble Space Telescope during a primary eclipse of the XO-1 system. Near photon-noise-limited spectroscopy between 1.2 and 1.8 μm allows us to determine the main composition of this hot-Jupiter's planetary atmosphere with good precision. This is the third hot-Jupiter's atmosphere for which spectroscopic data are available in the near-IR. The spectrum shows the presence of water vapor (H 2O), methane (CH4), and carbon dioxide (CO2), and suggests the possible presence of carbon monoxide (CO). We show that the published IRAC secondary transit emission photometric data are compatible with the atmospheric composition at the terminator determined from the NICMOS spectrum, with a range of possible mixing ratios and thermal profiles; additional emission spectroscopy data are needed to reduce the degeneracy of the possible solutions. Finally, we note the similarity between the 1.2-1.8 μm transmission spectra of XO-1b and HD 209458b, suggesting that in addition to having similar stellar/orbital and planetary parameters the two systems may also have a similar exoplanetary atmospheric composition.

Original languageEnglish (US)
JournalAstrophysical Journal Letters
Volume712
Issue number2 PART 2
DOIs
StatePublished - 2010

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Jupiter (planet)
Jupiter
atmospheric composition
spectroscopy
atmospheres
atmosphere
Jupiter atmosphere
planetary atmospheres
eclipses
transit
mixing ratios
Hubble Space Telescope
planetary atmosphere
carbon monoxide
water vapor
carbon dioxide
infrared spectra
methane
mixing ratio
orbitals

Keywords

  • Planetary systems
  • Techniques: spectroscopic

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Probing the terminator region atmosphere of the hot-jupiter xo-1b with transmission spectroscopy. / Tinetti, G.; Deroo, P.; Swain, M. R.; Griffith, Caitlin; Vasisht, G.; Brown, L. R.; Burke, C.; McCullough, P.

In: Astrophysical Journal Letters, Vol. 712, No. 2 PART 2, 2010.

Research output: Contribution to journalArticle

Tinetti, G. ; Deroo, P. ; Swain, M. R. ; Griffith, Caitlin ; Vasisht, G. ; Brown, L. R. ; Burke, C. ; McCullough, P. / Probing the terminator region atmosphere of the hot-jupiter xo-1b with transmission spectroscopy. In: Astrophysical Journal Letters. 2010 ; Vol. 712, No. 2 PART 2.
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