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Title: KEPLER FLARES. II. THE TEMPORAL MORPHOLOGY OF WHITE-LIGHT FLARES ON GJ 1243

We present the largest sample of flares ever compiled for a single M dwarf, the active M4 star GJ 1243. Over 6100 individual flare events, with energies ranging from 10{sup 29} to 10{sup 33} erg, are found in 11 months of 1 minute cadence data from Kepler. This sample is unique for its completeness and dynamic range. We have developed automated tools for finding flares in short-cadence Kepler light curves, and performed extensive validation and classification of the sample by eye. From this pristine sample of flares we generate a median flare template. This template shows that two exponential cooling phases are present during the white-light flare decay, providing fundamental constraints for models of flare physics. The template is also used as a basis function to decompose complex multi-peaked flares, allowing us to study the energy distribution of these events. Only a small number of flare events are not well fit by our template. We find that complex, multi-peaked flares occur in over 80% of flares with a duration of 50 minutes or greater. The underlying distribution of flare durations for events 10 minutes and longer appears to follow a broken power law. Our results support the idea that sympathetic flaring maymore » be responsible for some complex flare events.« less
Authors:
; ; ; ; ;  [1] ;  [2] ; ; ; ; ; ;  [3] ;  [4] ;  [5]
  1. Department of Astronomy, University of Washington, P.O. Box 351580, Seattle, WA 98195 (United States)
  2. Department of Physics, Hobart and William Smith Colleges, 300 Pulteney Street, Geneva, NY 14456 (United States)
  3. HL Dodge Department of Physics and Astronomy, University of Oklahoma, 440 W Brooks Street, Norman, OK 73019 (United States)
  4. NASA Goddard Space Flight Center, Code 671, Greenbelt, MD 20771 (United States)
  5. Universe Sandbox, 911 E. Pike Street #333, Seattle, WA 98122 (United States)
Publication Date:
OSTI Identifier:
22364799
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 797; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CLASSIFICATION; DIAGRAMS; DWARF STARS; ENERGY SPECTRA; LIMITING VALUES; MASS; MORPHOLOGY; STELLAR FLARES; VALIDATION; VISIBLE RADIATION