Hubble space telescope hot jupiter transmission spectral survey: A detection of na and strong optical absorption in HAT-P-1b

N. Nikolov, D. K. Sing, F. Pont, A. S. Burrows, J. J. Fortney, G. E. Ballester, T. M. Evans, C. M. Huitson, H. R. Wakeford, P. A. Wilson, S. Aigrain, D. Deming, N. P. Gibson, G. W. Henry, H. Knutson, A. Lecavelier Des Etangs, Adam Showman, A. Vidal-Madjar, K. Zahnle

Research output: Contribution to journalArticle

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Abstract

We present an optical to near-infrared transmission spectrum of the hot JupiterHAT-P-1b, based on Hubble Space Telescope observations, covering the spectral regime from 0.29 to 1.027μm with Space Telescope Imaging Spectrograph (STIS), which is coupled with a recent Wide Field Camera 3 (WFC3) transit (1.087 to 1.687μm). We derive refined physical parameters of the HAT-P-1 system, including an improved orbital ephemeris. The transmission spectrum shows a strong absorption signature shortward of 0.55μm, with a strong blueward slope into the near-ultraviolet. We detect atmospheric sodium absorption at a 3.3σ significance level, but find no evidence for the potassium feature. The red data imply a marginally flat spectrum with a tentative absorption enhancement at wavelength longer than ~0.85μm. The STIS and WFC3 spectra differ significantly in absolute radius level (4.3 ± 1.6 pressure scaleheights), implying strong optical absorption in the atmosphere of HAT-P-1b. The optical to near-infrared difference cannot be explained by stellar activity, as simultaneous stellar activity monitoring of the G0V HAT-P-1b host star and its identical companion show no significant activity that could explain the result. We compare the complete STIS and WFC3 transmission spectrum with theoretical atmospheric models which include haze, sodium and an extra optical absorber. We find that both an optical absorber and a supersolar sodium to water abundance ratio might be a scenario explaining the HAT-P-1b observations. Our results suggest that strong optical absorbers may be a dominant atmospheric feature in some hot Jupiter exoplanets.

Original languageEnglish (US)
Article numberstt1859
Pages (from-to)46-66
Number of pages21
JournalMonthly Notices of the Royal Astronomical Society
Volume437
Issue number1
DOIs
StatePublished - Dec 2013

Fingerprint

Jupiter (planet)
Hubble Space Telescope
Jupiter
optical absorption
stellar activity
spectrographs
absorbers
cameras
sodium
telescopes
near infrared
atmospheric feature
atmospheric models
haze
extrasolar planets
transit
potassium
coverings
signatures
detection

Keywords

  • Planets and satellites: individual: HAT-P-1b
  • Stars: individual: HAT-P-1b
  • Techniques: spectroscopic

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Hubble space telescope hot jupiter transmission spectral survey : A detection of na and strong optical absorption in HAT-P-1b. / Nikolov, N.; Sing, D. K.; Pont, F.; Burrows, A. S.; Fortney, J. J.; Ballester, G. E.; Evans, T. M.; Huitson, C. M.; Wakeford, H. R.; Wilson, P. A.; Aigrain, S.; Deming, D.; Gibson, N. P.; Henry, G. W.; Knutson, H.; Etangs, A. Lecavelier Des; Showman, Adam; Vidal-Madjar, A.; Zahnle, K.

In: Monthly Notices of the Royal Astronomical Society, Vol. 437, No. 1, stt1859, 12.2013, p. 46-66.

Research output: Contribution to journalArticle

Nikolov, N, Sing, DK, Pont, F, Burrows, AS, Fortney, JJ, Ballester, GE, Evans, TM, Huitson, CM, Wakeford, HR, Wilson, PA, Aigrain, S, Deming, D, Gibson, NP, Henry, GW, Knutson, H, Etangs, ALD, Showman, A, Vidal-Madjar, A & Zahnle, K 2013, 'Hubble space telescope hot jupiter transmission spectral survey: A detection of na and strong optical absorption in HAT-P-1b', Monthly Notices of the Royal Astronomical Society, vol. 437, no. 1, stt1859, pp. 46-66. https://doi.org/10.1093/mnras/stt1859
Nikolov, N. ; Sing, D. K. ; Pont, F. ; Burrows, A. S. ; Fortney, J. J. ; Ballester, G. E. ; Evans, T. M. ; Huitson, C. M. ; Wakeford, H. R. ; Wilson, P. A. ; Aigrain, S. ; Deming, D. ; Gibson, N. P. ; Henry, G. W. ; Knutson, H. ; Etangs, A. Lecavelier Des ; Showman, Adam ; Vidal-Madjar, A. ; Zahnle, K. / Hubble space telescope hot jupiter transmission spectral survey : A detection of na and strong optical absorption in HAT-P-1b. In: Monthly Notices of the Royal Astronomical Society. 2013 ; Vol. 437, No. 1. pp. 46-66.
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AU - Sing, D. K.

AU - Pont, F.

AU - Burrows, A. S.

AU - Fortney, J. J.

AU - Ballester, G. E.

AU - Evans, T. M.

AU - Huitson, C. M.

AU - Wakeford, H. R.

AU - Wilson, P. A.

AU - Aigrain, S.

AU - Deming, D.

AU - Gibson, N. P.

AU - Henry, G. W.

AU - Knutson, H.

AU - Etangs, A. Lecavelier Des

AU - Showman, Adam

AU - Vidal-Madjar, A.

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KW - Techniques: spectroscopic

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