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A consistent retrieval analysis of 10 Hot Jupiters observed in transmission

Barstow, JK; Aigrain, S; Irwin, PGJ; Sing, DK; (2017) A consistent retrieval analysis of 10 Hot Jupiters observed in transmission. The Astrophysical Journal , 834 (1) , Article 50. 10.3847/1538-4357/834/1/50. Green open access

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Abstract

We present a consistent optimal estimation retrieval analysis of 10 hot Jupiter exoplanets, each with transmission spectral data spanning the visible to near-infrared wavelength range. Using the NEMESIS radiative transfer and retrieval tool, we calculate a range of possible atmospheric states for WASP-6b, WASP-12b, WASP-17b, WASP-19b, WASP-31b, WASP-39b, HD 189733b, HD 209458b, HAT-P-1b, and HAT-P-12b. We find that the spectra of all 10 planets are consistent with the presence of some atmospheric aerosol; WASP-6b, WASP-12b, WASP-17b, WASP-19b, HD 189733b, and HAT-P-12b are all fit best by Rayleigh scattering aerosols, whereas WASP-31b, WASP-39b and HD 209458b are better represented by a gray cloud model. HAT-P-1b has solutions that fall into both categories. WASP-6b, HAT-P-12b, HD 189733b, and WASP-12b must have aerosol extending to low atmospheric pressures (below 0.1 mbar). In general, planets with equilibrium temperatures between 1300 and 1700 K are best represented by deeper, gray cloud layers, whereas cooler or hotter planets are better fit using high Rayleigh scattering aerosol. We find little evidence for the presence of molecular absorbers other than H2O. Retrieval methods can provide a consistent picture across a range of hot Jupiter atmospheres with existing data, and will be a powerful tool for the interpretation of James Webb Space Telescope observations.

Type: Article
Title: A consistent retrieval analysis of 10 Hot Jupiters observed in transmission
Open access status: An open access version is available from UCL Discovery
DOI: 10.3847/1538-4357/834/1/50
Publisher version: http://dx.doi.org/10.3847/1538-4357/834/1/50
Language: English
Additional information: Copyright © 2016 The American Astronomical Society. All rights reserved.
Keywords: Methods: data analysis; planets and satellites: atmospheres; radiative transfer
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: http://discovery.ucl.ac.uk/id/eprint/1530423
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