Spectroscopic observations of flares and superflares on AU Mic

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F25%3A00605556" target="_blank" >RIV/67985815:_____/25:00605556 - isvavai.cz</a>
Alternative codes found
RIV/00216224:14310/25:00140706 RIV/00216208:11320/25:10512559
Result on the web
<a href="https://hdl.handle.net/11104/0365911" target="_blank" >https://hdl.handle.net/11104/0365911</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/stae2752" target="_blank" >10.1093/mnras/stae2752</a>

Result language
angličtina
Original language name
Spectroscopic observations of flares and superflares on AU Mic
Original language description
The young active flare star AU Mic is the planet host star with the highest flare rate from Transiting Exoplanet Survey Satellite data. Therefore, it represents an ideal target for dedicated ground-based monitoring campaigns with the aim to characterize its numerous flares spectroscopically. We performed such spectroscopic monitoring with the ESO1.52-m telescope of the PLATOSpec consortium. In more than 190 h of observations, we find 24 flares suitable for detailed analysis. We compute their parameters (duration, peak flux, and energy) in eight chromospheric lines (H alpha, H beta, H gamma, H delta, Na I D1&D2, He I D3, He I 6678) and investigate their relationships. Furthermore, we obtained simultaneous photometric observations and low-resolution spectroscopy for part of the spectroscopic runs. We detect one flare in the g'-band photometry, which is associated with a spectroscopic flare. Additionally, an extreme flare event occurred on 2023-09-16 of which only a time around its possible peak was observed, during which chromospheric line fluxes were raised by up to a factor of three compared to the following night. The estimated energy of this event is around 10(33) erg in H alpha alone, i.e. a rare chromospheric line superflare.
Czech name
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Czech description
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Type
J<sub>imp</sub> - 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/GF22-30516K" target="_blank" >GF22-30516K: Superflares: Their origins and connection with planets</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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