Observed Rate Variation in Superflaring G-type Stars

Autor:	Crowley, James, Wheatland, Michael S., Yang, Kai
Rok vydání:	2022
Předmět:	Astrophysics - Solar and Stellar Astrophysics Astrophysics - Earth and Planetary Astrophysics
Druh dokumentu:	Working Paper
DOI:	10.3847/1538-4357/aca476
Popis:	Flare occurrence on the Sun is highly variable, exhibiting both short term variation due to the emergence and evolution of active regions, and long-term variation from the solar cycle. On solar-like stars, much larger stellar flares (superflares) have been observed, and it is of interest to determine whether observed rates of superflare occurrence exhibit similar variability to solar flares. We analyse 274 G-type stars using data from the Transiting Exoplanet Survey Satellite (TESS) and identify seven stars which exhibit statistically significant changes in the rate of superflare occurrence by fitting a piecewise constant-rate model with the Bayesian Blocks algorithm (Scargle et al 2012; arXiv:1207.5578). We investigate the properties of these stars and their flaring rates, and discuss the possible reasons for the low number of stars with detectable rate variation. Comment: 18 pages, 13 figures, ApJ Accepted 2022-11-21
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2212.00993 Zobrazit plný text záznamu View this record from Arxiv