Can Flare Loops Contribute to the White-light Emission of Stellar Superflares?

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F18%3A00495000" target="_blank" >RIV/67985815:_____/18:00495000 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.3847/1538-4357/aabe78" target="_blank" >http://dx.doi.org/10.3847/1538-4357/aabe78</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/1538-4357/aabe78" target="_blank" >10.3847/1538-4357/aabe78</a>

Result language

angličtina

Original language name

Can Flare Loops Contribute to the White-light Emission of Stellar Superflares?

Original language description

In this paper, we compute the WL emission from overlying flare loops depending on their density and temperature and show that, under conditions expected during superflares, the continuum brightening due to extended loop arcades can significantly contribute to stellar flux detected by Kepler. This requires electron densities in the loops of 10(12)-10(13) cm(-3) or higher. We show that such densities, exceeding those typically present in solar-flare loops, can be reached on M-dwarf and solar-type superflare stars with large starspots and much stronger magnetic fields. Quite importantly, the WL radiation of loops is not very sensitive to their temperature and thus both cool as well as hot loops may contribute. We show that the WL intensity emergent from optically thin loops is lower than the blackbody radiation from flare ribbons, but the contribution of loops to total stellar flux can be quite important due to their significant emitting areas.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/GA16-18495S" target="_blank" >GA16-18495S: Advanced solar science with IRIS</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Astrophysical Journal

ISSN

1538-4357

e-ISSN

—

Volume of the periodical

859

Issue of the periodical within the volume

2

Country of publishing house

US - UNITED STATES

Number of pages

7

Pages from-to

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UT code for WoS article

000433924000016

EID of the result in the Scopus database

2-s2.0-85048259885