Spectroscopic observations of flares and superflares on AU Mic
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , , , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2024
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866912216288067584 |
|---|---|
| author | Odert, P. Leitzinger, M. Greimel, R. Kabáth, P. Lipták, J. Heinzel, P. Karjalainen, R. Wollmann, J. Guenther, E. W. Skarka, M. Srba, J. Škoda, P. Frýda, J. Brahm, R. Vanzi, L. Janík, J. |
| author_facet | Odert, P. Leitzinger, M. Greimel, R. Kabáth, P. Lipták, J. Heinzel, P. Karjalainen, R. Wollmann, J. Guenther, E. W. Skarka, M. Srba, J. Škoda, P. Frýda, J. Brahm, R. Vanzi, L. Janík, J. |
| contents | The young active flare star AU~Mic is the planet host star with the highest flare rate from TESS 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 ESO1.52m telescope of the PLATOSpec consortium. In more than 190 hours of observations, we find 24 flares suitable for detailed analysis. We compute their parameters (duration, peak flux, energy) in eight chromospheric lines (H$α$, H$β$, H$γ$, H$δ$, 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$α$ alone, i.e. a rare chromospheric line superflare. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_09113 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spectroscopic observations of flares and superflares on AU Mic Odert, P. Leitzinger, M. Greimel, R. Kabáth, P. Lipták, J. Heinzel, P. Karjalainen, R. Wollmann, J. Guenther, E. W. Skarka, M. Srba, J. Škoda, P. Frýda, J. Brahm, R. Vanzi, L. Janík, J. Solar and Stellar Astrophysics Earth and Planetary Astrophysics The young active flare star AU~Mic is the planet host star with the highest flare rate from TESS 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 ESO1.52m telescope of the PLATOSpec consortium. In more than 190 hours of observations, we find 24 flares suitable for detailed analysis. We compute their parameters (duration, peak flux, energy) in eight chromospheric lines (H$α$, H$β$, H$γ$, H$δ$, 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$α$ alone, i.e. a rare chromospheric line superflare. |
| title | Spectroscopic observations of flares and superflares on AU Mic |
| topic | Solar and Stellar Astrophysics Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2412.09113 |