2019A&A...623A.166S


Query : 2019A&A...623A.166S

2019A&A...623A.166S - Astronomy and Astrophysics, volume 623A, 166-166 (2019/3-1)

Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS). II. A broadened sodium feature on the ultra-hot giant WASP-76b.

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 K., JOSEPH R., LAVIE B., MELO C., PEPE F., SEGRANSAN D. and UDRY S.

Abstract (from CDS):

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 studying the upper layers of atmospheres in this context. We report on the results from Hot Exoplanet Atmosphere Resolved with Transit Spectroscopy survey (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 High-Accuracy Radial-velocity Planet Searcher (HARPS) high-resolution spectrograph at the European Southern Observatory (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 0.75Å passband). The sodium lines have a Gaussian profile with full width at half maximum (FWHM) of 27.6±2.8km/s. This is significantly broader than the line spread function of HARPS (2.7km/s). We surmise that the observed broadening could trace the super-rotation in the upper atmosphere of this ultra-hot gas giant.

Abstract Copyright: © ESO 2019

Journal keyword(s): planets and satellites: atmospheres - planets and satellites: individual: WASP-76b - techniques: spectroscopic - instrumentation: spectrographs - methods: observational - planetary systems

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 BD+01 316 PM* 01 46 31.8575937456 +02 42 02.030065560   10.13 9.52     F7 49 0
2 BD+01 316b Pl 01 46 31.8576707085 +02 42 02.033178181           ~ 134 0
3 WASP-49b Pl 06 04 21.4734612842 -16 57 55.108837741           ~ 47 1
4 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1288 1
5 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1705 1

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2022.09.24-17:35:08

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