An improved model for the upper atmosphere of Epsilon Eridani

The photochemistry and composition of the atmosphere of a planet orbiting a star in its habitable zone is critically influenced by the near and far UV radiation emitted by the host star. In particular, the extreme UV and X-rays photons can drive atmospheric mass loss. At the present some regions of...

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Detalles Bibliográficos
Autores principales: Vieytes, M. C., Peralta, J. I.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2021
Materias:
Ciencias Astronómicas
stars: individual (Epsilon Eridani)
stars: atmospheres
stars: stellar models
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/166632
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-166632
record_format dspace
spelling I19-R120-10915-1666322024-05-31T20:01:53Z http://sedici.unlp.edu.ar/handle/10915/166632 An improved model for the upper atmosphere of Epsilon Eridani Vieytes, M. C. Peralta, J. I. 2021 2024-05-31T17:52:51Z en Ciencias Astronómicas stars: individual (Epsilon Eridani) stars: atmospheres stars: stellar models The photochemistry and composition of the atmosphere of a planet orbiting a star in its habitable zone is critically influenced by the near and far UV radiation emitted by the host star. In particular, the extreme UV and X-rays photons can drive atmospheric mass loss. At the present some regions of the UV spectra are unobservable due to interstellar absorption, and for the characterization of the UV radiation environment around a planet, a reliable atmospheric stellar model for the host star is needed. In this work we present an initial stellar model for the upper atmosphere of the dK2V star, Epsilon Eridani. Here we extend our previous photosphere-chromosphere model that accurately reproduced the visible continuum and several important spectral features observed at CASLEO. In order to build the upper part of our model corresponding to the transition region and corona, data from HST and XMM obtained as part of the MUSCLES (Measurements of the Ultraviolet Spectral Characteristics of Low-mass Exoplanetary Systems) survey are going to be used. For this work, we started the development of the model using the data from HST only. The use of this new model, that takes in account the complete stellar atmosphere from the photosphere to the corona, allows us to obtain a reliable calculation of the radiation received by the planet. La composición y fotoquímica de la atmósfera de un planeta que órbita una estrella en su zona habitable está fuertemente influenciada por la radiación UV cercana y lejana emitida por la misma. En particular, el UV extremo y los fotones de rayos X pueden producir pérdida de masa atmosférica. Actualmente algunas regiones UV del espectro no pueden ser observadas debido a la absorción interestelar, por lo que es necesario un modelo atmosférico estelar confiable que permita la caracterización de la radiación UV en el entorno del planeta. En este trabajo presentamos un modelo estelar inicial para la alta atmósfera de la estrella dK2V, Epsilon Eridani. Extendemos nuestro modelo de fotósfera-cromósfera previo que reprodujo de manera precisa el continuo visible y muchas características espectrales observadas en CASLEO. Para la construcción de la parte superior del modelo, correspondiente a la región de transición y la corona, serán utilizados los datos de HST y XMM obtenidos como parte del proyecto MUSCLES (Measurements of the Ultraviolet Spectral Characteristics of Lowmass Exoplanetary Systems). Para este trabajo, comenzamos el desarrollo del modelo utilizando los datos del HST únicamente. La utilización de este nuevo modelo que tiene en cuenta la atmósfera completa (desde la fotosfera hasta la corona), nos permite obtener cálculos confiables de la radiación recibida por el planeta. Asociación Argentina de Astronomía Articulo Articulo http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf 92-94
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
stars: individual (Epsilon Eridani)
stars: atmospheres
stars: stellar models
spellingShingle Ciencias Astronómicas
stars: individual (Epsilon Eridani)
stars: atmospheres
stars: stellar models
Vieytes, M. C.
Peralta, J. I.
An improved model for the upper atmosphere of Epsilon Eridani
topic_facet Ciencias Astronómicas
stars: individual (Epsilon Eridani)
stars: atmospheres
stars: stellar models
description The photochemistry and composition of the atmosphere of a planet orbiting a star in its habitable zone is critically influenced by the near and far UV radiation emitted by the host star. In particular, the extreme UV and X-rays photons can drive atmospheric mass loss. At the present some regions of the UV spectra are unobservable due to interstellar absorption, and for the characterization of the UV radiation environment around a planet, a reliable atmospheric stellar model for the host star is needed. In this work we present an initial stellar model for the upper atmosphere of the dK2V star, Epsilon Eridani. Here we extend our previous photosphere-chromosphere model that accurately reproduced the visible continuum and several important spectral features observed at CASLEO. In order to build the upper part of our model corresponding to the transition region and corona, data from HST and XMM obtained as part of the MUSCLES (Measurements of the Ultraviolet Spectral Characteristics of Low-mass Exoplanetary Systems) survey are going to be used. For this work, we started the development of the model using the data from HST only. The use of this new model, that takes in account the complete stellar atmosphere from the photosphere to the corona, allows us to obtain a reliable calculation of the radiation received by the planet.
format Articulo
Articulo
author Vieytes, M. C.
Peralta, J. I.
author_facet Vieytes, M. C.
Peralta, J. I.
author_sort Vieytes, M. C.
title An improved model for the upper atmosphere of Epsilon Eridani
title_short An improved model for the upper atmosphere of Epsilon Eridani
title_full An improved model for the upper atmosphere of Epsilon Eridani
title_fullStr An improved model for the upper atmosphere of Epsilon Eridani
title_full_unstemmed An improved model for the upper atmosphere of Epsilon Eridani
title_sort improved model for the upper atmosphere of epsilon eridani
publishDate 2021
url http://sedici.unlp.edu.ar/handle/10915/166632
work_keys_str_mv AT vieytesmc animprovedmodelfortheupperatmosphereofepsiloneridani
AT peraltaji animprovedmodelfortheupperatmosphereofepsiloneridani
AT vieytesmc improvedmodelfortheupperatmosphereofepsiloneridani
AT peraltaji improvedmodelfortheupperatmosphereofepsiloneridani
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