HST HOT-JUPITER TRANSMISSION SPECTRAL SURVEY: CLEAR SKIES FOR COOL SATURN WASP-39b
We present the. Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS) optical transmission spectroscopy of the cool Saturn-mass exoplanet WASP-39b from 0.29-1.025 mu m, along with complementary transit observations from Spitzer IRAC at 3.6 and 4.5 mu m. The low density and large a...
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ndltd-arizona.edu-oai-arizona.openrepository.com-10150-6212782016-11-05T03:00:33Z HST HOT-JUPITER TRANSMISSION SPECTRAL SURVEY: CLEAR SKIES FOR COOL SATURN WASP-39b Fischer, Patrick D. Knutson, Heather A. Sing, David K. Henry, Gregory W. Williamson, Michael W. Fortney, Jonathan J. Burrows, Adam S. Kataria, Tiffany Nikolov, Nikolay Showman, Adam P. Ballester, Gilda E. Desert, Jean-Michel Aigrain, Suzanne Deming, Drake des Etangs, Alain Lecavelier Vidal-Madjar, Alfred Univ Arizona, Lunar & Planetary Lab planetary systems planets and satellites atmospheres stars individual (WASP-39) techniques spectroscopic We present the. Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS) optical transmission spectroscopy of the cool Saturn-mass exoplanet WASP-39b from 0.29-1.025 mu m, along with complementary transit observations from Spitzer IRAC at 3.6 and 4.5 mu m. The low density and large atmospheric pressure scale height of WASP-39b make it particularly amenable to atmospheric characterization using this technique. We detect a Rayleigh scattering slope as well as sodium and potassium absorption features; this is the first exoplanet in which both alkali features are clearly detected with the extended wings predicted by cloud-free atmosphere models. The full transmission spectrum is well matched by a clear H-2-dominated atmosphere, or one containing a weak contribution from haze, in good agreement with the preliminary reduction of these data presented in Sing et al.. WASP-39b is predicted to have a pressure-temperature profile comparable to that of HD 189733b and WASP-6b, making it one of the coolest transiting gas giants observed in our HST STIS survey. Despite this similarity, WASP-39b appears to be largely cloud-free, while the transmission spectra of HD 189733b and WASP-6b both indicate the presence of high altitude clouds or hazes. These observations further emphasize the surprising diversity of cloudy and cloud-free gas giant planets in short-period orbits and the corresponding challenges associated with developing predictive cloud models for these atmospheres. 2016-08-10 Article Patrick D. Fischer et al 2016 ApJ 827 19 0004-637X 10.3847/0004-637X/827/1/19 http://hdl.handle.net/10150/621278 http://arizona.openrepository.com/arizona/handle/10150/621278 Astrophysical Journal en http://iopscience.iop.org/article/10.3847/0004-637X/827/1/19/meta © 2016. The American Astronomical Society. All rights reserved. IOP PUBLISHING LTD |
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language |
en |
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topic |
planetary systems planets and satellites atmospheres stars individual (WASP-39) techniques spectroscopic |
spellingShingle |
planetary systems planets and satellites atmospheres stars individual (WASP-39) techniques spectroscopic Fischer, Patrick D. Knutson, Heather A. Sing, David K. Henry, Gregory W. Williamson, Michael W. Fortney, Jonathan J. Burrows, Adam S. Kataria, Tiffany Nikolov, Nikolay Showman, Adam P. Ballester, Gilda E. Desert, Jean-Michel Aigrain, Suzanne Deming, Drake des Etangs, Alain Lecavelier Vidal-Madjar, Alfred HST HOT-JUPITER TRANSMISSION SPECTRAL SURVEY: CLEAR SKIES FOR COOL SATURN WASP-39b |
description |
We present the. Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS) optical transmission spectroscopy of the cool Saturn-mass exoplanet WASP-39b from 0.29-1.025 mu m, along with complementary transit observations from Spitzer IRAC at 3.6 and 4.5 mu m. The low density and large atmospheric pressure scale height of WASP-39b make it particularly amenable to atmospheric characterization using this technique. We detect a Rayleigh scattering slope as well as sodium and potassium absorption features; this is the first exoplanet in which both alkali features are clearly detected with the extended wings predicted by cloud-free atmosphere models. The full transmission spectrum is well matched by a clear H-2-dominated atmosphere, or one containing a weak contribution from haze, in good agreement with the preliminary reduction of these data presented in Sing et al.. WASP-39b is predicted to have a pressure-temperature profile comparable to that of HD 189733b and WASP-6b, making it one of the coolest transiting gas giants observed in our HST STIS survey. Despite this similarity, WASP-39b appears to be largely cloud-free, while the transmission spectra of HD 189733b and WASP-6b both indicate the presence of high altitude clouds or hazes. These observations further emphasize the surprising diversity of cloudy and cloud-free gas giant planets in short-period orbits and the corresponding challenges associated with developing predictive cloud models for these atmospheres. |
author2 |
Univ Arizona, Lunar & Planetary Lab |
author_facet |
Univ Arizona, Lunar & Planetary Lab Fischer, Patrick D. Knutson, Heather A. Sing, David K. Henry, Gregory W. Williamson, Michael W. Fortney, Jonathan J. Burrows, Adam S. Kataria, Tiffany Nikolov, Nikolay Showman, Adam P. Ballester, Gilda E. Desert, Jean-Michel Aigrain, Suzanne Deming, Drake des Etangs, Alain Lecavelier Vidal-Madjar, Alfred |
author |
Fischer, Patrick D. Knutson, Heather A. Sing, David K. Henry, Gregory W. Williamson, Michael W. Fortney, Jonathan J. Burrows, Adam S. Kataria, Tiffany Nikolov, Nikolay Showman, Adam P. Ballester, Gilda E. Desert, Jean-Michel Aigrain, Suzanne Deming, Drake des Etangs, Alain Lecavelier Vidal-Madjar, Alfred |
author_sort |
Fischer, Patrick D. |
title |
HST HOT-JUPITER TRANSMISSION SPECTRAL SURVEY: CLEAR SKIES FOR COOL SATURN WASP-39b |
title_short |
HST HOT-JUPITER TRANSMISSION SPECTRAL SURVEY: CLEAR SKIES FOR COOL SATURN WASP-39b |
title_full |
HST HOT-JUPITER TRANSMISSION SPECTRAL SURVEY: CLEAR SKIES FOR COOL SATURN WASP-39b |
title_fullStr |
HST HOT-JUPITER TRANSMISSION SPECTRAL SURVEY: CLEAR SKIES FOR COOL SATURN WASP-39b |
title_full_unstemmed |
HST HOT-JUPITER TRANSMISSION SPECTRAL SURVEY: CLEAR SKIES FOR COOL SATURN WASP-39b |
title_sort |
hst hot-jupiter transmission spectral survey: clear skies for cool saturn wasp-39b |
publisher |
IOP PUBLISHING LTD |
publishDate |
2016 |
url |
http://hdl.handle.net/10150/621278 http://arizona.openrepository.com/arizona/handle/10150/621278 |
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