Connection between planetary He I λ10 830 Å absorption and extreme-ultraviolet emission of planet-host stars

[Context] The detection of the He I λ10 830 Å triplet in exoplanet atmospheres has opened a new window for probing planetary properties, including atmospheric escape. Unlike Lyman α, the triplet is significantly less affected by interstellar medium (ISM) absorption. Sufficient X-ray and extreme ultr...

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Detalles Bibliográficos
Autores: Sanz-Forcada, J., López-Puertas, Manuel, Lampón, M., Czesla, S., Nortmann, L., Caballero, J. A., Zapatero Osorio, María Rosa, Amado, Pedro J., Murgas, Felipe, Orell-Miquel, Jaume, Pallé, Enric, Quirrenbach, Andreas, Reiners, Ansgar, Ribas, Ignasi, Sánchez-López, A., Solano, Enrique
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2025
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/385232
Acceso en línea:http://hdl.handle.net/10261/385232
http://arxiv.org/abs/2501.03716v2
Access Level:acceso abierto
Palabra clave:Planets and satellites: atmospheres
Planets and satellites: general
Stars: coronae
Ultraviolet: planetary systems
X-rays: stars
Descripción
Sumario:[Context] The detection of the He I λ10 830 Å triplet in exoplanet atmospheres has opened a new window for probing planetary properties, including atmospheric escape. Unlike Lyman α, the triplet is significantly less affected by interstellar medium (ISM) absorption. Sufficient X-ray and extreme ultraviolet (XUV) stellar irradiation may trigger the formation of the He I triplet via photoionization and posterior recombination processes in the planet atmospheres. Only a weak trend between stellar XUV emission and the planetary He I strength has been observed so far.

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