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Localizing flares to understand stellar magnetic fields and space weather in exo-systems

  • Stars are uniform spheres, but only to first order. The way in which stellar rotation and magnetism break this symmetry places important observational constraints on stellar magnetic fields, and factors in the assessment of the impact of stellar activity on exoplanet atmospheres. The spatial distribution of flares on the solar surface is well known to be nonuniform, but elusive on other stars. We briefly review the techniques available to recover the loci of stellar flares, and highlight a new method that enables systematic flare localization directly from optical light curves. We provide an estimate of the number of flares we may be able to localize with the Transiting Exoplanet Survey Satellite, and show that it is consistent with the results obtained from the first full sky scan of the mission. We suggest that nonuniform flare latitude distributions need to be taken into account in accurate assessments of exoplanet habitability.

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Author details:Ekaterina IlinORCiDGND, Katja PoppenhägerORCiDGND, Julián David Alvarado-GómezORCiD
DOI:https://doi.org/10.1002/asna.20210111
ISSN:1521-3994
Title of parent work (English):Astronomische Nachrichten = Astronomical notes
Publisher:Berlin
Place of publishing:Wiley-VCH
Publication type:Article
Language:English
Date of first publication:2022/01/09
Publication year:2022
Release date:2023/04/17
Tag:activity - stars; analysis; data; flare - stars; magnetic fields - methods; stars
Volume:343
Issue:4
Article number:e210111
Number of pages:7
Funding institution:Leibniz-Gemeinschaft [P67/2018]; Studienstiftung des Deutschen Volkes
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
DDC classification:5 Naturwissenschaften und Mathematik / 52 Astronomie / 520 Astronomie und zugeordnete Wissenschaften
Peer review:Referiert
Publishing method:Open Access / Hybrid Open-Access
License (German):License LogoCC-BY - Namensnennung 4.0 International
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