Seidel, J. V.; Ehrenreich, D.; Wyttenbach, A.; Allart, R.; Lendl, M.; Pino, L.; Bourrier, V.; Cegla, H. M.; Lovis, C.; Barrado, D.; Bayliss, D.; Astudillo-Defru, N.; Deline, A.; Fisher, C.; Heng, Kevin; Joseph, R.; Lavie, Baptiste; Melo, C.; Pepe, F.; Ségransan, D.; ... (2019). Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS). Astronomy and astrophysics, 623(A166), A166. EDP Sciences 10.1051/0004-6361/201834776
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High-resolution optical spectroscopy is a powerful tool to characterise exoplanetary atmospheres from the ground. The sodium D lines, with their large cross sections, are especially suited to study the upper layers of atmospheres in this context. We report on the results from HEARTS, a spectroscopic survey of exoplanet atmospheres, performing a comparative study of hot gas giants to determine the effects of stellar irradiation. In this second installation of the series, we highlight the detection of neutral sodium on the ultra-hot giant WASP-76b. We observed three transits of the planet using the HARPS high-resolution spectrograph at the ESO 3.6m telescope and collected 175 spectra of WASP-76. We repeatedly detect the absorption signature of neutral sodium in the planet atmosphere (0.371±0.034%; 10.75σ in a 0.75 Å passband). The sodium lines have a Gaussian profile with full width at half maximum (FWHM) of 27.6±2.8 km s⁻¹. This is significantly broader than the line spread function of HARPS (2.7 km s⁻¹). We surmise that the observed broadening could trace the super-rotation in the upper atmosphere of this ultra-hot gas giant.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences 08 Faculty of Science > Physics Institute 10 Strategic Research Centers > Center for Space and Habitability (CSH) 08 Faculty of Science > Physics Institute > NCCR PlanetS |
UniBE Contributor: |
Fisher, Chloe Elizabeth, Heng, Kevin, Lavie, Baptiste |
Subjects: |
500 Science 500 Science > 520 Astronomy 500 Science > 530 Physics |
ISSN: |
0004-6361 |
Publisher: |
EDP Sciences |
Language: |
English |
Submitter: |
Danielle Zemp |
Date Deposited: |
14 Apr 2020 14:24 |
Last Modified: |
05 Dec 2022 15:38 |
Publisher DOI: |
10.1051/0004-6361/201834776 |
ArXiv ID: |
1902.00001v1 |
BORIS DOI: |
10.7892/boris.142653 |
URI: |
https://boris.unibe.ch/id/eprint/142653 |
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