INFRARED TRANSMISSION SPECTROSCOPY OF THE EXOPLANETS HD 209458b AND XO-1b USING THE WIDE FIELD CAMERA-3 ON THE HUBBLE SPACE TELESCOPE
Drake Deming,Drake Deming,A. Wilkins,Peter R. McCullough,Adam Burrows,Jonathan J. Fortney,Eric Agol,Eric Agol,Ian Dobbs-Dixon,Ian Dobbs-Dixon,Nikku Madhusudhan,Nicolas Crouzet,Jean-Michel Desert,Ronald L. Gilliland,Korey Haynes,Korey Haynes,Heather Knutson,Michael R. Line,Zazralt Magic,Avi Mandell,Sukrit Ranjan,David Charbonneau,Mark Clampin,Sara Seager,Adam P. Showman +24 more
TLDR
In this paper, the authors reported WFC3 spectroscopy of the giant planets HD 209458b and XO-1b in transit, using spatial scanning mode for maximum photon-collecting efficiency.Abstract:
Exoplanetary transmission spectroscopy in the near-infrared using the Hubble Space Telescope (HST) NICMOS is currently ambiguous because different observational groups claim different results from the same data, depending on their analysis methodologies. Spatial scanning with HST/WFC3 provides an opportunity to resolve this ambiguity. We here report WFC3 spectroscopy of the giant planets HD 209458b and XO-1b in transit, using spatial scanning mode for maximum photon-collecting efficiency. We introduce an analysis technique that derives the exoplanetary transmission spectrum without the necessity of explicitly decorrelating instrumental effects, and achieves nearly photon-limited precision even at the high flux levels collected in spatial scan mode. Our errors are within 6% (XO-1) and 26% (HD 209458b) of the photon-limit at a resolving power of λ/δλ ~ 70, and are better than 0.01% per spectral channel. Both planets exhibit water absorption of approximately 200 ppm at the water peak near 1.38 μm. Our result for XO-1b contradicts the much larger absorption derived from NICMOS spectroscopy. The weak water absorption we measure for HD 209458b is reminiscent of the weakness of sodium absorption in the first transmission spectroscopy of an exoplanet atmosphere by Charbonneau et al. Model atmospheres having uniformly distributed extra opacity of 0.012 cm2 g−1 account approximately for both our water measurement and the sodium absorption. Our results for HD 209458b support the picture advocated by Pont et al. in which weak molecular absorptions are superposed on a transmission spectrum that is dominated by continuous opacity due to haze and/or dust. However, the extra opacity needed for HD 209458b is grayer than for HD 189733b, with a weaker Rayleigh component.read more
Citations
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An optical transmission spectrum of the ultra-hot Jupiter WASP-33b. First indication of AlO in an exoplanet
C. von Essen,Matthias Mallonn,Luis Welbanks,Nikku Madhusudhan,A. Pinhas,Hervé Bouy,P. Weis Hansen +6 more
TL;DR: In this article, the authors used the OSIRIS spectrograph to characterize the atmosphere of the ultra-hot Jupiter WASP-33b using two primary transits taken 18 orbits apart.
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The Near-Infrared Transmission Spectra of TRAPPIST-1 Planets b, c, d, e, f, and g and Stellar Contamination in Multi-Epoch Transit Spectra
TL;DR: In this paper, an independent reduction and analysis of two HST Wide Field Camera 3 (WFC3) near-infrared transit spectroscopy datasets for six planets (b through g) is presented.
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Atmospheric Characterization of Five Hot Jupiters with the Wide Field Camera 3 on the Hubble Space Telescope
Sukrit Ranjan,David Charbonneau,Jean-Michel Desert,Jean-Michel Desert,Nikku Madhusudhan,Nikku Madhusudhan,Drake Deming,A. Wilkins,Avi Mandell +8 more
TL;DR: In this article, the structure and composition of the atmospheres of five hot Jupiter exoplanets using the Hubble Space Telescope Wide Field Camera 3 (WFC3) instrument were investigated.
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On the Detection of Molecules in the Atmosphere of HD189733b using HST NICMOS Transmission Spectroscopy
TL;DR: In this article, a uniform spectral retrieval analysis of the three, independent, published spectra together with null hypothesis testing is presented, showing strong evidence for the detection of molecular features mainly due to water and methane while the third is consistent with a weak molecular detection at the 2.2$\sigma level.
Journal ArticleDOI
Near-infrared transmission spectrum of the warm-uranus GJ 3470b with the Wide Field Camera-3 on the Hubble Space Telescope
David Ehrenreich,Xavier Bonfils,Christophe Lovis,Xavier Delfosse,Thierry Forveille,Michel Mayor,V. Neves,V. Neves,Nuno C. Santos,Stéphane Udry,Damien Ségransan +10 more
TL;DR: In this paper, the first space-borne spectrum of GJ3470b was obtained during one transit of the planet with WFC3 on board HST, operated in stare mode.
References
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