Scheucher, M. und Herbst, K und Schmidt, V und Grenfell, John Lee und Schreier, Franz und Banjac, S und Heber, B und Rauer, H und Sinnhuber, M (2020) Proxima Centauri b: A Strong Case for Including Cosmic-Ray-induced Chemistry in Atmospheric Biosignature Studies. Astrophysical Journal, 893 (12), Seiten 1-7. Institute of Physics (IOP) Publishing. doi: 10.3847/1538-4357/ab7b74. ISSN 0004-637X.
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Offizielle URL: https://iopscience.iop.org/article/10.3847/1538-4357/ab7b74
Kurzfassung
Due to its Earth-like minimum mass of 1.27 M E and its close proximity to our solar system, Proxima Centauri b is one of the most interesting exoplanets for habitability studies. Its host star, Proxima Centauri, is however a strongly flaring star, which is expected to provide a very hostile environment for potentially habitable planets. We perform a habitability study of Proxima Centauri b assuming an Earth-like atmosphere under high stellar particle bombardment, with a focus on spectral transmission features. We employ our extensive model suite calculating energy spectra of stellar particles, their journey through the planetary magnetosphere, ionosphere, and atmosphere, ultimately providing planetary climate and spectral characteristics, as outlined in Herbst et al. Our results suggest that together with the incident stellar energy flux, high particle influxes can lead to efficient heating of the planet well into temperate climates, by limiting CH4 amounts, which would otherwise run into antigreenhouse for such planets around M stars. We identify some key spectral features relevant for future spectral observations: First, NO2 becomes the major absorber in the visible, which greatly impacts the Rayleigh slope. Second, H2O features can be masked by CH4 (near-infrared) and CO2 (mid- to far-infrared), making them nondetectable in transmission. Third, O3 is destroyed and instead HNO3 features become clearly visible in the mid- to far-infrared. Lastly, assuming a few percent of CO2 in the atmosphere, CO2 absorption at 5.3 μm becomes significant (for flare and nonflare cases), strongly overlapping with a flare related NO feature in Earth's atmosphere.
elib-URL des Eintrags: | https://elib.dlr.de/137307/ | ||||||||||||||||||||||||||||||||||||||||
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Dokumentart: | Zeitschriftenbeitrag | ||||||||||||||||||||||||||||||||||||||||
Titel: | Proxima Centauri b: A Strong Case for Including Cosmic-Ray-induced Chemistry in Atmospheric Biosignature Studies | ||||||||||||||||||||||||||||||||||||||||
Autoren: |
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Datum: | 10 April 2020 | ||||||||||||||||||||||||||||||||||||||||
Erschienen in: | Astrophysical Journal | ||||||||||||||||||||||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||||||||||||||||||||||
Open Access: | Nein | ||||||||||||||||||||||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||||||||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||||||||||||||||||||||||||
In ISI Web of Science: | Ja | ||||||||||||||||||||||||||||||||||||||||
Band: | 893 | ||||||||||||||||||||||||||||||||||||||||
DOI: | 10.3847/1538-4357/ab7b74 | ||||||||||||||||||||||||||||||||||||||||
Seitenbereich: | Seiten 1-7 | ||||||||||||||||||||||||||||||||||||||||
Verlag: | Institute of Physics (IOP) Publishing | ||||||||||||||||||||||||||||||||||||||||
ISSN: | 0004-637X | ||||||||||||||||||||||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||||||||||||||||||||||
Stichwörter: | exoplanets; atmospheric; cosmic rays; composition | ||||||||||||||||||||||||||||||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||||||||||||||||||||||||||||||
HGF - Programm: | Raumfahrt | ||||||||||||||||||||||||||||||||||||||||
HGF - Programmthema: | Erforschung des Weltraums | ||||||||||||||||||||||||||||||||||||||||
DLR - Schwerpunkt: | Raumfahrt | ||||||||||||||||||||||||||||||||||||||||
DLR - Forschungsgebiet: | R EW - Erforschung des Weltraums | ||||||||||||||||||||||||||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | R - Vorhaben Planetary Evolution and Life (alt) | ||||||||||||||||||||||||||||||||||||||||
Standort: | Berlin-Adlershof , Oberpfaffenhofen | ||||||||||||||||||||||||||||||||||||||||
Institute & Einrichtungen: | Institut für Planetenforschung > Extrasolare Planeten und Atmosphären Institut für Planetenforschung > Leitungsbereich PF Institut für Methodik der Fernerkundung > Atmosphärenprozessoren | ||||||||||||||||||||||||||||||||||||||||
Hinterlegt von: | Grenfell, John Lee | ||||||||||||||||||||||||||||||||||||||||
Hinterlegt am: | 09 Nov 2020 15:30 | ||||||||||||||||||||||||||||||||||||||||
Letzte Änderung: | 27 Okt 2023 14:49 |
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