Search for GeV gamma-ray emission from the possible TeV-bright red dwarfs with Fermi-LAT
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
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2024
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| _version_ | 1866929282131951616 |
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| author | Huang, Chen Zhang, Xiao Chen, Yang Zhong, Wen-Juan |
| author_facet | Huang, Chen Zhang, Xiao Chen, Yang Zhong, Wen-Juan |
| contents | Red dwarfs have been suggested to be among the possible astrophysical species accelerating particles and emitting TeV $γ$-rays. As an effort to search for the GeV $γ$-ray counterparts of the suggested TeV emission from eight red dwarfs, we analyse the 0.2--500 GeV $γ$-ray emission of the regions covering them exploiting the $\sim$13.6 yr Pass 8 data of the Fermi Large Area Telescope. A GeV $γ$-ray emission excess with significance of 3.8$σ$ is detected in the direction of the red dwarf V962 Tau. This emission contains V962 Tau in 1$σ$ error radius and is independent of the catalog source. However, the stellar flare scenario can hardly explain the total energy and lightcurve derived from the $γ$-ray emission in view of the spectral analysis. We also analyse the lightcurves in the positions of the eight red dwarfs and no time bin with significance $>$5$σ$ is found. Therefore, no significant emission from the red dwarfs could be concluded to be detected by Fermi-LAT. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_12524 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Search for GeV gamma-ray emission from the possible TeV-bright red dwarfs with Fermi-LAT Huang, Chen Zhang, Xiao Chen, Yang Zhong, Wen-Juan High Energy Astrophysical Phenomena Solar and Stellar Astrophysics Red dwarfs have been suggested to be among the possible astrophysical species accelerating particles and emitting TeV $γ$-rays. As an effort to search for the GeV $γ$-ray counterparts of the suggested TeV emission from eight red dwarfs, we analyse the 0.2--500 GeV $γ$-ray emission of the regions covering them exploiting the $\sim$13.6 yr Pass 8 data of the Fermi Large Area Telescope. A GeV $γ$-ray emission excess with significance of 3.8$σ$ is detected in the direction of the red dwarf V962 Tau. This emission contains V962 Tau in 1$σ$ error radius and is independent of the catalog source. However, the stellar flare scenario can hardly explain the total energy and lightcurve derived from the $γ$-ray emission in view of the spectral analysis. We also analyse the lightcurves in the positions of the eight red dwarfs and no time bin with significance $>$5$σ$ is found. Therefore, no significant emission from the red dwarfs could be concluded to be detected by Fermi-LAT. |
| title | Search for GeV gamma-ray emission from the possible TeV-bright red dwarfs with Fermi-LAT |
| topic | High Energy Astrophysical Phenomena Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2403.12524 |