Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/32076
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Wyttenbach, A. | en_US |
dc.contributor.author | Lovis, C. | en_US |
dc.contributor.author | Ehrenreich, D. | en_US |
dc.contributor.author | Bourrier, V. | en_US |
dc.contributor.author | Pino, Lorenzo | en_US |
dc.contributor.author | Allart, R. | en_US |
dc.contributor.author | Astudillo-Defru, N. | en_US |
dc.contributor.author | Cegla, H. M. | en_US |
dc.contributor.author | Heng, K. | en_US |
dc.contributor.author | Lavie, B. | en_US |
dc.contributor.author | Melo, C. | en_US |
dc.contributor.author | Murgas, F. | en_US |
dc.contributor.author | Santerne, A. | en_US |
dc.contributor.author | Ségransan, D. | en_US |
dc.contributor.author | Udry, S. | en_US |
dc.contributor.author | Pepe, F. | en_US |
dc.date.accessioned | 2022-04-01T10:51:14Z | - |
dc.date.available | 2022-04-01T10:51:14Z | - |
dc.date.issued | 2017 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/32076 | - |
dc.description.abstract | High-resolution optical spectroscopy during the transit of HD 189733b, a prototypical hot Jupiter, allowed the resolution of the Na I D sodium lines in the planet, giving access to the extreme conditions of the planet upper atmosphere. We have undertaken HEARTS, a spectroscopic survey of exoplanet upper atmospheres, to perform a comparative study of hot gas giants and determine how stellar irradiation affect them. Here, we report on the first HEARTS observations of the hot Saturn-mass planet WASP-49b. We observed the planet with the HARPS high-resolution spectrograph at ESO 3.6 m telescope. We collected 126 spectra of WASP-49, covering three transits of WASP-49b. We analyzed and modeled the planet transit spectrum, while paying particular attention to the treatment of potentially spurious signals of stellar origin. We spectrally resolve the Na I D lines in the planet atmosphere and show that these signatures are unlikely to arise from stellar contamination. The large contrasts of 2.0 ± 0.5% (D<SUB>2</SUB>) and 1.8 ± 0.7% (D<SUB>1</SUB>) require the presence of hot neutral sodium ( K) at high altitudes ( 1.5 planet radius or 45 000 km). From estimating the cloudiness index of WASP-49b, we determine its atmosphere to be cloud free at the altitudes probed by the sodium lines. WASP-49b is close to the border of the evaporation desert and exhibits an enhanced thermospheric signature with respect to a farther-away planet such as HD 189733b. <P />Based on observations made at ESO 3.6 m telescope at the La Silla Observatory under ESO program 096.C-0331.... | en_US |
dc.language.iso | eng | en_US |
dc.title | Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS). I. Detection of hot neutral sodium at high altitudes on WASP-49b | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/201630063 | en_US |
dc.identifier.scopus | 2-s2.0-85020019579 | en_US |
dc.identifier.url | http://arxiv.org/abs/1702.00448v1 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/full_html/2017/06/aa30063-16/aa30063-16.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 602 | en_US |
dc.relation.firstpage | A36 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | sì | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | ASTRONOMY & ASTROPHYSICS | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2017A&A...602A..36W | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.grantfulltext | open | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.languageiso639-1 | en | - |
item.openairetype | Article | - |
item.cerifentitytype | Publications | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.orcid | 0000-0002-1321-8856 | - |
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