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http://hdl.handle.net/20.500.12386/29830
Titolo: | Neutral Iron Emission Lines from the Dayside of KELT-9b: The GAPS Program with HARPS-N at TNG XX | Autori: | Pino, Lorenzo Désert, Jean-Michel BROGI, MATTEO Malavolta, Luca Wyttenbach, Aurélien Line, Michael Hoeijmakers, Jens Fossati, Luca BONOMO, ALDO STEFANO NASCIMBENI, VALERIO Panwar, Vatsal AFFER, Laura BENATTI, SERENA BIAZZO, Katia BIGNAMINI, ANDREA Borsa, Franscesco CARLEO, Ilaria CLAUDI, Riccardo COSENTINO, Rosario COVINO, Elvira Damasso, Mario DESIDERA, Silvano GIACOBBE, Paolo HARUTYUNYAN, AVET LANZA, Antonino Francesco LETO, Giuseppe MAGGIO, Antonio Maldonado, Jesus Mancini, Luigi MICELA, Giuseppina MOLINARI, Emilio Carlo PAGANO, Isabella PIOTTO , GIAMPAOLO PORETTI, Ennio RAINER, Monica SCANDARIATO, GAETANO SOZZETTI, Alessandro Allart, Romain BORSATO, LUCA BRUNO, GIOVANNI DI FABRIZIO, LUCA Ehrenreich, David Martinez Fiorenzano, Aldo Fabricio FRUSTAGLI, GIUSEPPE Lavie, Baptiste Lovis, Christophe MAGAZZU', Antonio Nardiello, Domenico Pedani, Marco SMAREGLIA, Riccardo |
Data pubblicazione: | 2020 | Rivista: | THE ASTROPHYSICAL JOURNAL LETTERS | Numero: | 894 | Fascicolo: | 2 | Da pagina:: | L27 | Abstract: | We present the first detection of atomic emission lines from the atmosphere of an exoplanet. We detect neutral iron lines from the dayside of KELT-9b (T<SUB>eq</SUB> ∼ 4000 K). We combined thousands of spectrally resolved lines observed during one night with the HARPS-N spectrograph (R ∼ 115,000), mounted at the Telescopio Nazionale Galileo. We introduce a novel statistical approach to extract the planetary parameters from the binary mask cross-correlation analysis. We also adapt the concept of contribution function to the context of high spectral resolution observations, to identify the location in the planetary atmosphere where the detected emission originates. The average planetary line profile intersected by a stellar G2 binary mask was found in emission with a contrast of 84 ± 14 ppm relative to the planetary plus stellar continuum (40% ± 5% relative to the planetary continuum only). This result unambiguously indicates the presence of an atmospheric thermal inversion. Finally, assuming a modeled temperature profile previously published, we show that an iron abundance consistent with a few times the stellar value explains the data well. In this scenario, the iron emission originates at the 10<SUP>-3</SUP>-10<SUP>-5</SUP> bar level. | URI: | http://hdl.handle.net/20.500.12386/29830 | URL: | https://iopscience.iop.org/article/10.3847/2041-8213/ab8c44 | ISSN: | 2041-8205 | DOI: | 10.3847/2041-8213/ab8c44 | Bibcode ADS: | 2020ApJ...894L..27P | Fulltext: | open |
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