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Analysis of the chromosphere and corona of low-activity early-M dwarfs

Published online by Cambridge University Press:  24 September 2020

Gaetano Scandariato Open the ORCID record for Gaetano Scandariato [Opens in a new window] ,
E. González Álvarez ,
J. Maldonado ,
A. Suárez Mascareño ,
M. Perger  and
the HADES collaboration
Gaetano Scandariato
Affiliation:
INAF – Osservatorio Astrofisico di Catania, via S. Sofia 78, 95123 Catania, Italy email: mailto:gaetano.scandariato@inaf.it
E. González Álvarez
Affiliation:
INAF – Osservatorio Astronomico di Palermo, Piazza del Parlamento, 1, I-90134, Palermo, Italy Dipartimento di Fisica e Chimica, Università di Palermo, Piazza del Parlamento 1, I-90134 Palermo, Italy
J. Maldonado
Affiliation:
INAF – Osservatorio Astronomico di Palermo, Piazza del Parlamento, 1, I-90134, Palermo, Italy
A. Suárez Mascareño
Affiliation:
Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain Universidad de La Laguna, Dpto. Astrofsica, 38206 La Laguna, Tenerife, Spain
M. Perger
Affiliation:
Institut de Cincies de lEspai (ICE, CSIC), Campus UAB, C/ Can Magrans, s/n, 08193 Bellaterra, Spain Institut d'Estudis Espacials de Catalunya (IEEC), 08034 Barcelona, Spain
the HADES collaboration
Affiliation:
Institut de Cincies de lEspai (ICE, CSIC), Campus UAB, C/ Can Magrans, s/n, 08193 Bellaterra, Spain Institut d'Estudis Espacials de Catalunya (IEEC), 08034 Barcelona, Spain
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Abstract

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While most of the exoplanets have been found orbiting around solar-type stars, low-mass stars have recently been recognized as ideal exo-life laboratory. Currently, stellar activity is one of the limiting factors for the characterization of Earth-twins and for assessing their habitability: understanding the activity of M dwarfs is thus crucial. In this contribution I present the spectroscopic analysis of the quiet early-M dwarfs monitored within the HADES (HArps-n red Dwarf Exoplanet Survey) radial velocity survey. The spectra allow us to analyze simultaneously the Ca ii H&K doublet and the Hydrogen Balmer series, while the intensive follow up gives us a large number of spectra ( 100) for each target. We complement this dataset with ground-based follow-up photometry and archival X-ray data. I present our results on the activity-rotation-stellar parameters and flux-flux relationships, and discuss the correlation of emission fluxes at low activity levels and the evolution timescales of active regions.

Keywords

stars: activitystars: atmospheresstars: chromospheresstars: coronaestars: late-typestars: low-mass, brown dwarfsstars: rotationstars: spots
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S354: Solar and Stellar Magnetic Fields: Origins and Manifestations , June 2019 , pp. 355 - 362
Copyright
© International Astronomical Union 2020

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