Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/31626
DC Field | Value | Language |
---|---|---|
dc.contributor.author | BORSA, Francesco | en_US |
dc.contributor.author | Luca Fossati | en_US |
dc.contributor.author | Tommi Koskinen | en_US |
dc.contributor.author | Mitchell E. Young | en_US |
dc.contributor.author | Denis Shulyak | en_US |
dc.date.accessioned | 2022-03-16T15:29:29Z | - |
dc.date.available | 2022-03-16T15:29:29Z | - |
dc.date.issued | 2022 | en_US |
dc.identifier.issn | 2397-3366 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/31626 | - |
dc.description.abstract | Oxygen is a constituent of many of the most abundant molecules detected in exoplanetary atmospheres and a key ingredient for tracking how and where a planet formed1. In particular, the O i 777.4 nm triplet is used to probe airglow and aurora on the Earth2 and the oxygen abundance in stellar atmospheres3–6, but has not been detected in an exoplanet atmosphere before. We present a definite ground-based detection of the neutral oxygen 777.4 nm triplet lines in the transmission spectrum of the ultrahot Jupiter KELT-9b7, the hottest known giant planet. The synthetic spectrum computed employing novel non-local thermodynamic equilibrium radiative transfer calculations8 matches the data significantly better than that computed assuming local thermodynamic equilibrium. These non-local thermodynamic equilibrium radiative transfer calculations imply a mass-loss rate of 108–109 kg s−1, which exceeds the lower limit of 107–108 kg s−1 required to facilitate the escape of oxygen and iron from the atmosphere. Assuming a solar oxygen abundance, the non-local thermodynamic equilibrium model points towards the need for microturbulence and macroturbulence broadening of 3.0 ± 0.7 km s−1 and 13 ± 5 km s−1, respectively, indicative of the presence of fast winds in the middle and upper atmosphere. Present and upcoming high-resolution spectrographs will allow the detection in other exoplanets of the 777.4 nm O i triplet, which is a powerful tool to constrain the key characteristics of exoplanetary atmospheres when coupled with forward modelling accounting for non-local thermodynamic equilibrium effects. | en_US |
dc.language.iso | eng | en_US |
dc.title | High-resolution detection of neutral oxygen and non-LTE effects in the atmosphere of KELT-9b | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1038/s41550-021-01544-4 | en_US |
dc.identifier.scopus | 2-s2.0-85121510841 | en_US |
dc.identifier.url | https://www.nature.com/articles/s41550-021-01544-4 | en_US |
dc.relation.medium | ELETTRONICO | en_US |
dc.relation.volume | 6 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 226--231 | en_US |
dc.relation.lastpage | 231 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 5 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | en_US |
dc.contributor.country | USA | en_US |
dc.contributor.country | GBR | en_US |
dc.contributor.country | ESP | en_US |
dc.contributor.country | AUT | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | NATURE ASTRONOMY | en_US |
dc.type.miur | 262 Articolo in rivista | - |
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 | 2397-3366 | - |
crisitem.journal.ance | E240167 | - |
crisitem.author.dept | O.A. Brera | - |
crisitem.author.orcid | 0000-0003-4830-0590 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
2112.12059.pdf | preprint | 3.66 MB | Adobe PDF | View/Open |
s41550-021-01544-4.pdf | [Administrators only] | 1.72 MB | Adobe PDF |
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