The white-light superflares from cool stars in GWAC triggers
arXiv:2407.08183 · doi:10.3847/1538-4357/ad55e8
Abstract
M-type stars are the ones that flare most frequently, but how big their maximum flare energy can reach is still unknown. We present 163 flares from 162 individual M2 through L1-type stars that triggered the GWAC, with flare energies ranging from to erg . The flare amplitudes range from to mag. Flare energy increases with stellar surface temperature () but both and equivalent duration seem to be independent of . Combining periods detected from light curves of TESS and K2, spectra from LAMOST, SDSS and the 2.16 m Telescope, and the Gaia DR3 data, we found that these GWAC flare stars are young. For the stars that have spectra, we found that these stars are in or very near to the saturation region, and is lower for M7-L1 stars than for M2-M6 stars. We also studied the relation between GWAC flare bolometric energy and stellar hemispherical area , and found that (in erg) increases with increasing (in cm), and the maximum flare energy . For M7-L1 stars, there seem to be other factors limiting their maximum flare energies in addition to stellar hemispherical area.
18 pages, 11 figures, 4 tables
References in corpus (30)
- Improving PARSEC models for very low mass stars
- The H emission of nearby M dwarfs and its relation to stellar rotation
- Generalized investigation of the rotation-activity relation: Favouring rotation period instead of Rossby number
- Solar-type dynamo behaviour in fully convective stars without a tachocline
- Do Kepler superflare stars really include slowly-rotating Sun-like stars ? - Results using APO 3.5m telescope spectroscopic observations and Gaia-DR2 data -
- The flare catalog and the flare activity in the Kepler mission
- BOSS Ultracool Dwarfs I: Colors and Magnetic Activity of M and L dwarfs
- A Survey for New Members of Taurus from Stellar to Planetary Masses
- No Such Thing as a Simple Flare: Substructure and QPPs Observed in a Statistical Sample of 20 Second Cadence TESS Flares
- Calibration of the Halpha Age-Activity relation for M dwarfs
- Evaluating Rotation Periods of M Dwarfs Across the Ages
- Statistical Analysis of Stellar Flares from the First Three Years of TESS Observations
- Stellar flares detected with the Next Generation Transit Survey
- Magnetic Flux and Magnetic Non-potentiality of Active Regions in Eruptive and Confined Solar Flares
- Galactic Kinematics and Observed Flare Rates of a Volume-Complete Sample of Mid-to-Late M-dwarfs: Constraints on the History of the Stellar Radiation Environment of Planets Orbiting Low-mass Stars
- Detection of Flare-associated CME Candidates on Two M-dwarfs by GWAC and Fast, Time-resolved Spectroscopic Follow-ups
- Characteristic time of stellar flares on Sun-like stars
- Impact of stellar flares on the chemical composition and transmission spectra of gaseous exoplanets orbiting M dwarfs
- An Automatic Observation Management System of the GWAC Network I: System Architecture and Workflow
- Detection of a giant white-light flare on an L2.5 dwarf with the Next Generation Transit Survey
- The Ca II H&K Rotation-Activity Relation in 53 mid-to-late type M-Dwarfs
- Prompt-to-afterglow transition of optical emission in a long gamma-ray burst consistent with a fireball
- Main-sequence star super-flares based on entire Kepler data
- A mag Super Flare of An Ultracool Star Detected by System
- Flaring-associated Complex Dynamics in Two M-dwarfs Revealed by Fast, Time-resolved Spectroscopy
- Photometric observations of flares on AD Leo from GWAC-F30 and TESS
- Estimating the Convective Turnover Time
- Magnetic activities and parameters of 43 flare stars in the GWAC archive
- ELM of ELM-WD: An extremely low mass hot star discovered in LAMOST survey
- A huge-amplitude white-light superflare on a L0 brown dwarf discovered by GWAC survey