A Study of X-ray Flares on the Active M Dwarf Wolf 359

Stellar flares are transient energy-release events that liberate energy across the entire electromagnetic spectrum, from X-rays to radio waves. Accurately characterizing these events requires simultaneous multi-wavelength observations, which are essential for correlating energy partitioning with specific flare properties. We obtained simultaneous multi-wavelength data for the nearby active star Wolf 359 using the Transiting Exoplanet Survey Satellite (TESS), the X-ray Multi-Mirror Mission (XMM-Newton), the Neil Gehrels Swift Observatory (Swift) XRT/UVOT, the Neutron Star Interior Composition Explorer (NICER), the Australia Telescope Compact Array (ATCA), the Las Cumbres Observatory Global Telescope Network (LCOGT), and the Apache Point Observatory (APO) during TESS Sector 46 (December 2–30, 2021). Here, we present results of our analysis of ten X-ray flares observed simultaneously by XMM-Newton and TESS. These results will be helpful to enhance our understanding of the atmospheric conditions of exoplanets orbiting stars of the same spectral type (e.g., Proxima Centauri) during their early evolutionary stages.