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Modeling a Carrington-scale Stellar Superflare and Coronal Mass Ejection from κ1Cet
Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA.
NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA;Amer Univ, Dept Phys, Washington, DC 20016 USA.ORCID iD: 0000-0003-4452-0588
NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.
Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80303 USA.
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2019 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 880, no 2, article id 97Article in journal (Refereed) Published
Abstract [en]

Observations from the Kepler mission have revealed frequent superflares on young and active solar-like stars. Superflares result from the large-scale restructuring of stellar magnetic fields, and are associated with the eruption of coronal material (a coronal mass ejection, or CME) and energy release that can be orders of magnitude greater than those observed in the largest solar flares. These catastrophic events, if frequent, can significantly impact the potential habitability of terrestrial exoplanets through atmospheric erosion or intense radiation exposure at the surface. We present results from numerical modeling designed to understand how an eruptive superflare from a young solar-type star, kappa(1)Cet, could occur and would impact its astrospheric environment. Our data-inspired, three-dimensional magnetohydrodynamic modeling shows that global-scale shear concentrated near the radial-field polarity inversion line can energize the closed-field stellar corona sufficiently to power a global, eruptive superflare that releases approximately the same energy as the extreme 1859 Carrington event from the Sun. We examine proxy measures of synthetic emission during the flare and estimate the observational signatures of our CME-driven shock, both of which could have extreme space-weather impacts on the habitability of any Earth-like exoplanets. We also speculate that the observed 1986 Robinson-Bopp superflare from. kappa(1)Cet was perhaps as extreme for that star as the Carrington flare was for the Sun.

Place, publisher, year, edition, pages
2019. Vol. 880, no 2, article id 97
Keywords [en]
magnetohydrodynamics (MHD), solar-terrestrial relations, stars: magnetic field, stars: solar-type, Sun: coronal mass ejections (CMEs), Sun: flares
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-393119DOI: 10.3847/1538-4357/ab287eISI: 000478778000025OAI: oai:DiVA.org:uu-393119DiVA, id: diva2:1354143
Funder
Knut and Alice Wallenberg FoundationSwedish Research Council, 621-2014-5720Swedish National Space Board, 185/14Swedish National Space Board, 137/17Available from: 2019-09-24 Created: 2019-09-24 Last updated: 2019-09-24Bibliographically approved

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Kochukhov, OlegRosén, Lisa

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