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Characterizing Exoplanetary Atmospheres at High Resolution with SPIRou: Detection of Water on HD 189733 b

Title
Characterizing Exoplanetary Atmospheres at High Resolution with SPIRou: Detection of Water on HD 189733 b
Type
Article in International Scientific Journal
Year
2021
Authors
Boucher, A
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Darveau Bernier, A
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Pelletier, S
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Lafreniere, D
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Artigau, E
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Cook, NJ
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Allart, R
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Radica, M
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Doyon, R
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Benneke, B
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Arnold, L
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Bonfils, X
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Bourrier, V
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Cloutier, R
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da Silva, JG
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Deibert, E
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Delfosse, X
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Donati, JF
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Ehrenreich, D
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Figueira, P
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Forveille, T
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Fouque, P
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Gagne, J
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Gaidos, E
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Hebrard, G
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Jayawardhana, R
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Klein, B
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Lovis, C
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Martins, JHC
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Martioli, E
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Moutou, C
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N.C. Santos
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FCUP
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Journal
Title: Astronomical JournalImported from Authenticus Search for Journal Publications
Vol. 162
Final page: 233
ISSN: 0004-6256
Other information
Authenticus ID: P-00V-NA8
Abstract (EN): We present the first exoplanet atmospheric detection made as part of the SPIRou Legacy Survey, a Large Observing Program of 300 nights exploiting the capabilities of SPIRou, the new near-infrared high-resolution (R similar to 70,000) spectropolarimeter installed on the Canada-France-Hawaii Telescope (3.6 m). We observed two transits of HD 189733b, an extensively studied hot Jupiter that is known to show prominent water vapor absorption in its transmission spectrum. When combining the two transits, we successfully detect the planet's water vapor absorption at 5.9 sigma using a cross-correlation t-test, or with a Delta BIC > 10 using a log-likelihood calculation. Using a Bayesian retrieval framework assuming parameterized temperature-pressure (T-P) profile atmospheric models, we constrain the planet atmospheric parameters, in the region probed by our transmission spectrum, to the following values: log(10)VMR[H2O] -4.4(-0.4)(+0.4), and P (cloud) greater than or similar to 0.2 bar (gray clouds), both of which are consistent with previous studies of this planet. Our retrieved water volume-mixing ratio is slightly subsolar; although, combining it with the previously retrieved super-solar CO abundances from other studies would imply a super-solar C/O ratio. We furthermore measure a net blueshift of the planet signal of -4.62(-0.44)(+0.46) km s(-1), which is somewhat larger than many previous measurements and unlikely to result solely from winds in the planet's atmosphere, although it could possibly be explained by a transit signal dominated by the trailing limb of the planet. This large blueshift is observed in all of the different detection/retrieval methods that were performed and in each of the two transits independently.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 18
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