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dc.contributor.author
Tilipman, Dennis  
dc.contributor.author
Vieytes, Mariela Cristina  
dc.contributor.author
Linsky, Jeffrey L.  
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Buccino, Andrea Paola  
dc.contributor.author
France, Kevin  
dc.date.available
2022-12-27T18:39:20Z  
dc.date.issued
2021-03  
dc.identifier.citation
Tilipman, Dennis; Vieytes, Mariela Cristina; Linsky, Jeffrey L.; Buccino, Andrea Paola; France, Kevin; Semi-Empirical Modeling of the Atmospheres of the M Dwarf Exoplanet Hosts GJ 832 and GJ 581; IOP Publishing; Astrophysical Journal; 909; 1; 3-2021; 1-15  
dc.identifier.issn
0004-637X  
dc.identifier.uri
http://hdl.handle.net/11336/182602  
dc.description.abstract
Stellar ultraviolet (UV) radiation drives photochemistry, and extreme-ultraviolet (EUV) radiation drives mass loss in exoplanet atmospheres. However, the UV flux is partly unobservable due to interstellar absorption, particularly in the EUV range (100-912 Å). It is therefore necessary to reconstruct the unobservable spectra in order to characterize the radiation environment of exoplanets. In the present work, we use a radiative transfer code SSRPM to build one-dimensional semiempirical models of two M dwarf exoplanet hosts, GJ 832 and GJ 581, and synthesize their spectra. SSRPM is equipped with an extensive atomic and molecular database and full-NLTE capabilities. We use observations in the visible, ultraviolet, and X-ray ranges to constrain atmospheric structures of the modeled stars. The synthesized integrated EUV fluxes are found to be in good agreement with other reconstruction techniques, but the spectral energy distributions disagree significantly across the EUV range. More than two-thirds of the EUV flux is formed above 105 K. We find that the far-ultraviolet (FUV) continuum contributes 42%-54% of the entire FUV flux between 1450 and 1700 Å. The comparison of stellar structures of GJ 832 and GJ 581 suggests that GJ 832 is a more magnetically active star, which is corroborated by other activity indicators.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
IOP Publishing  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by/2.5/ar/  
dc.subject
STARS: LOW MASS  
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STARS: LATE TYPE  
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STARS:CHROMOSPHERES  
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STARS:CORONA  
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ULTRAVIOLET:STARS  
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STARS:INDIVIDUAL (GJ 832, GJ 581)  
dc.subject.classification
Astronomía  
dc.subject.classification
Ciencias Físicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Semi-Empirical Modeling of the Atmospheres of the M Dwarf Exoplanet Hosts GJ 832 and GJ 581  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2022-09-23T10:06:01Z  
dc.identifier.eissn
1538-4357  
dc.journal.volume
909  
dc.journal.number
1  
dc.journal.pagination
1-15  
dc.journal.pais
Reino Unido  
dc.journal.ciudad
Londres  
dc.description.fil
Fil: Tilipman, Dennis. National Solar Observatory; Estados Unidos. State University of Colorado at Boulder; Estados Unidos  
dc.description.fil
Fil: Vieytes, Mariela Cristina. Universidad Nacional de Tres de Febrero; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina  
dc.description.fil
Fil: Linsky, Jeffrey L.. State University of Colorado at Boulder; Estados Unidos  
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Fil: Buccino, Andrea Paola. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina  
dc.description.fil
Fil: France, Kevin. State University of Colorado at Boulder; Estados Unidos  
dc.journal.title
Astrophysical Journal  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/1538-4357/abd62f#artAbst  
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info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.3847/1538-4357/abd62f  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/2012.11738