Flares and habitability

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At present, dwarf M stars are being considered as potential hosts for habitable planets. However, an important fraction of these stars are flare stars, which among other kind of radiation, emit large amounts of UV radiation during flares, and it is unknown how this events can affect life, since biol...

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Autores principales:	Abrevaya, X.C., Cortón, E., Mauas, P.J.D.
Formato:	Artículo publishedVersion
Publicado:	2011
Materias:	astrobiology stars: activity stars: flare ultraviolet: stars
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_17439213_v7_nS286_p405_Abrevaya http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_17439213_v7_nS286_p405_Abrevaya_oai
Aporte de:	Repositorio Digital de la Universidad de Buenos Aires (UBA) de Universidad de Buenos Aires

id	I28-R145-paper_17439213_v7_nS286_p405_Abrevaya_oai
record_format	dspace
spelling	I28-R145-paper_17439213_v7_nS286_p405_Abrevaya_oai2020-10-19 Abrevaya, X.C. Cortón, E. Mauas, P.J.D. 2011 At present, dwarf M stars are being considered as potential hosts for habitable planets. However, an important fraction of these stars are flare stars, which among other kind of radiation, emit large amounts of UV radiation during flares, and it is unknown how this events can affect life, since biological systems are particularly vulnerable to UV. In this work we evaluate a well known dMe star, EV Lacertae (GJ 873) as a potential host for the emergence and evolution of life, focusing on the effects of the UV emission associated with flare activity. Since UV-C is particularly harmful for living organisms, we studied the effect of UV-C radiation on halophile archaea cultures. The halophile archaea or haloarchaea are extremophile microorganisms, which inhabit in hypersaline environments and which show several mechanisms to cope with UV radiation since they are naturally exposed to intense solar UV radiation on Earth. To select the irradiance to be tested, we considered a moderate flare on this star. We obtained the mean value for the UV-C irradiance integrating the IUE spectrum in the impulsive phase, and considering a hypothetical planet in the center of the liquid water habitability zone. To select the irradiation times we took the most frequent duration of flares on this star which is from 9 to 27 minutes. Our results show that even after considerable UV damage, the haloarchaeal cells survive at the tested doses, showing that this kind of life could survive in a relatively hostile UV environment. © 2012 International Astronomical Union. Fil:Abrevaya, X.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cortón, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Mauas, P.J.D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. application/pdf http://hdl.handle.net/20.500.12110/paper_17439213_v7_nS286_p405_Abrevaya info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar Proc. Int. Astron. Union 2011;7(S286):405-409 astrobiology stars: activity stars: flare ultraviolet: stars Flares and habitability info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_17439213_v7_nS286_p405_Abrevaya_oai
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-145
collection	Repositorio Digital de la Universidad de Buenos Aires (UBA)
topic	astrobiology stars: activity stars: flare ultraviolet: stars
spellingShingle	astrobiology stars: activity stars: flare ultraviolet: stars Abrevaya, X.C. Cortón, E. Mauas, P.J.D. Flares and habitability
topic_facet	astrobiology stars: activity stars: flare ultraviolet: stars
description	At present, dwarf M stars are being considered as potential hosts for habitable planets. However, an important fraction of these stars are flare stars, which among other kind of radiation, emit large amounts of UV radiation during flares, and it is unknown how this events can affect life, since biological systems are particularly vulnerable to UV. In this work we evaluate a well known dMe star, EV Lacertae (GJ 873) as a potential host for the emergence and evolution of life, focusing on the effects of the UV emission associated with flare activity. Since UV-C is particularly harmful for living organisms, we studied the effect of UV-C radiation on halophile archaea cultures. The halophile archaea or haloarchaea are extremophile microorganisms, which inhabit in hypersaline environments and which show several mechanisms to cope with UV radiation since they are naturally exposed to intense solar UV radiation on Earth. To select the irradiance to be tested, we considered a moderate flare on this star. We obtained the mean value for the UV-C irradiance integrating the IUE spectrum in the impulsive phase, and considering a hypothetical planet in the center of the liquid water habitability zone. To select the irradiation times we took the most frequent duration of flares on this star which is from 9 to 27 minutes. Our results show that even after considerable UV damage, the haloarchaeal cells survive at the tested doses, showing that this kind of life could survive in a relatively hostile UV environment. © 2012 International Astronomical Union.
format	Artículo Artículo publishedVersion
author	Abrevaya, X.C. Cortón, E. Mauas, P.J.D.
author_facet	Abrevaya, X.C. Cortón, E. Mauas, P.J.D.
author_sort	Abrevaya, X.C.
title	Flares and habitability
title_short	Flares and habitability
title_full	Flares and habitability
title_fullStr	Flares and habitability
title_full_unstemmed	Flares and habitability
title_sort	flares and habitability
publishDate	2011
url	http://hdl.handle.net/20.500.12110/paper_17439213_v7_nS286_p405_Abrevaya http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_17439213_v7_nS286_p405_Abrevaya_oai
work_keys_str_mv	AT abrevayaxc flaresandhabitability AT cortone flaresandhabitability AT mauaspjd flaresandhabitability
_version_	1766026800933109760

Flares and habitability

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