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Detection of Na, K, and H alpha absorption in the atmosphere of WASP-52b using ESPRESSO
Chen, G.1; Casasayas-Barris, N.2,3; Palle, E.2,3; Yan, F.4; Stangret, M.2,3; Cegla, H. M.5; Allart, R.5; Lovis, C.5
2020-03-31
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN0004-6361
Volume635Issue:0Pages:12
Abstract

WASP-52b is a low-density hot Jupiter orbiting a moderately active K2V star. Previous low-resolution studies have revealed a cloudy atmosphere and found atomic Na above the cloud deck. Here we report on the detection of excess absorption at the Na doublet, the H alpha line, and the K D-1 line. We derived a high-resolution transmission spectrum based on three transits of WASP-52b, observed with the ultra-stable, high-resolution spectrograph ESPRESSO at the Very Large Telescope array. We measured a line contrast of 1.09 +/- 0.16% for Na D-1, 1.31 +/- 0.13% for Na D-2, 0.86 +/- 0.13% for H alpha, and 0.46 +/- 0.13% for K D-1, with a line FWHM range of 11-22 km s(-1). We also found that the velocity shift of these detected lines during the transit is consistent with the planet's orbital motion, thus confirming their planetary origin. We did not observe any significant net blueshift or redshift that could be attributed to planetary winds. We used activity indicator lines as control but found no excess absorption. However, we did notice signatures arising from the Center-to-Limb variation (CLV) and the Rossiter-McLaughlin (RM) effect at these control lines. This highlights the importance of the CLV + RM correction in correctly deriving the transmission spectrum, which, if not corrected, could resemble or cancel out planetary absorption in certain cases. WASP-52b is the second non-ultra-hot Jupiter to show excess H alpha absorption after HD 189733b. Future observations targeting non-ultra-hot Jupiters that show H alpha could help reveal the relation between stellar activity and the heating processes in the planetary upper atmosphere.

Keywordplanetary systems planets and satellites: individual: WASP-52b planets and satellites: atmospheres techniques: spectroscopic
DOI10.1051/0004-6361/201936986
WOS KeywordTRANSITING EXTRASOLAR PLANETS ; TRANSMISSION SPECTRUM ; ORBITAL MOTION ; SODIUM ; SPECTROSCOPY ; ROTATION ; VELOCITY ; 189733B ; SYSTEMS ; LINES
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000526208800003
PublisherEDP SCIENCES S A
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/35991
Collection中国科学院紫金山天文台
Corresponding AuthorChen, G.
Affiliation1.Chinese Acad Sci, Key Lab Planetary Sci, Purple Mt Observ, Nanjing 210033, Peoples R China
2.Inst Astrofis Canarias, Via Lactea S-N, Tenerife 38205, Spain
3.Univ La Laguna, Dept Astrofis, San Cristobal la Laguna, Spain
4.Georg August Univ, Inst Astrophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany
5.Univ Geneva, Observ Astron, Chemin Maillettes 51, CH-1290 Versoix, Switzerland
Recommended Citation
GB/T 7714
Chen, G.,Casasayas-Barris, N.,Palle, E.,et al. Detection of Na, K, and H alpha absorption in the atmosphere of WASP-52b using ESPRESSO[J]. ASTRONOMY & ASTROPHYSICS,2020,635(0):12.
APA Chen, G..,Casasayas-Barris, N..,Palle, E..,Yan, F..,Stangret, M..,...&Lovis, C..(2020).Detection of Na, K, and H alpha absorption in the atmosphere of WASP-52b using ESPRESSO.ASTRONOMY & ASTROPHYSICS,635(0),12.
MLA Chen, G.,et al."Detection of Na, K, and H alpha absorption in the atmosphere of WASP-52b using ESPRESSO".ASTRONOMY & ASTROPHYSICS 635.0(2020):12.
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