Speaker
Description
Red dwarfs have been suggested to be among the possible Galactic cosmic ray sources and emitting $\gamma$-rays upto the TeV regime. As an effort to search for the GeV $\gamma$-ray counterparts of the suggested TeV emission from eight red dwarfs, we analyse the 0.2-500 GeV $\gamma$-ray emission of the regions covering them exploiting the ∼13.6 yr Pass 8 data of the Fermi Large Area Telescope. A GeV $\gamma$-ray emission excess with significance of 3.8σ is detected in the direction of the red dwarf V962 Tau. This emission contains V962 Tau in 1σ 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 $\gamma$-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 >5σ is found. Therefore, no significant emission from the red dwarfs could be concluded to be detected by Fermi -LAT. Contribution of red dwarfs to cosmic rays is also discussed.
