Photometric observations of flares on AD Leo from GWAC-F30 and TESS

Abstract

We observed active M dwarf star AD Leo for 146 hr in photometry by GWAC-F30 and also analyzed 528-hr photometric data of the star from TESS. A total of 9 and 70 flares are detected from GWAC-F30 and TESS, respectively. Flare durations, amplitudes and energies are calculated. The distributions of the three properties and FFDs are given. Within the same energy range of flares, the FFDs of AD Leo obtained in this research and the previous study are basically consistent, which suggests that the magnetic activity of this star has not significantly changed compared to that decades ago. Comparing with the average FFD of M-type stars, AD Leo's FFD is twice higher, indicating that its magnetic activity is more active than that of the average level of the M-type. Based on TESS light curve, AD Leo's rotation period is calculated as 2.21$\left(\genfrac{}{}{0ex}{}{+0.01}{-0.01}\right)$ day , supporting the result given in previous research. During the decay phase of the most energetic flare from TESS, we identified QPPs and determined a 26.5-min oscillation period, which is currently the longest period for AD Leo, suggesting that long periodic physical process existed during flare of this star.

References in corpus (15)

• The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
• Extreme Water Loss and Abiotic O${}_2$ Buildup On Planets Throughout the Habitable Zones of M Dwarfs
• Kepler Flares I. Active and Inactive M dwarfs
• The flare catalog and the flare activity in the Kepler mission
• Probing the Blow-Off Criteria of Hydrogen-Rich "Super-Earths"
• MOST Observations of our Nearest Neighbor: Flares on Proxima Centauri
• The detection of M-dwarf UV flare events in the GALEX data archives
• High-resolution spectroscopy of flares and CMES on AD Leo*
• The Stellar Activity of TRAPPIST-1 and Consequences for the Planetary Atmospheres
• The Solar Neighborhood. XXXIV. A Search for Planets Orbiting Nearby M Dwarfs using Astrometry
• Detection of Flare-associated CME Candidates on Two M-dwarfs by GWAC and Fast, Time-resolved Spectroscopic Follow-ups
• Origin and Stability of Exomoon Atmospheres - Implications for Habitability
• An Automatic Observation Management System of the GWAC Network I: System Architecture and Workflow
• Searching for stellar flares from low mass stars using ASKAP and TESS
• Photometric and Spectroscopic Study of Flares on Ross 15

Cited by in corpus (2)

• The white-light superflares from cool stars in GWAC triggers
• Starspots as the origin of ultrafast drifting radio bursts from an active M dwarf