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Title: Kepler Data on KIC 7341653: A Nearby M Dwarf with Monster Flares and a Phase-coherent Variability

Abstract

KIC 7341653 is one of several late-type M dwarfs observed by the main mission of Kepler with peculiar infrared colors placing them in the domain of suspected young stellar objects (YSO). It is likely associated with a powerful X-ray emitter with X-ray flares. Kepler light curves reveal two distinct types of activity: frequent flares lasting from less than 30 minutes to a few hours, and a periodic variability with a period of 0.5463441(7) days. The largest detected flare increased the flux in the Kepler passband by a factor of 2.8 and released an estimated 4 × 10{sup 34} erg of energy in the Kepler band. Segmented periodogram analysis reveals that the amplitude of the periodic variation was subject to secular changes, dropping from peak values around 20 ppt to below 5 ppt toward the end of the mission, while the phase varied periodically with an amplitude of 0.15 rad and period 362(3) days. Two possible interpretations of the phase periodicity are discussed: a migrating long-lived photospheric spot, and a Doppler frequency shift generated by a solar-mass faint companion, such as a white dwarf.

Authors:
 [1];  [2]
  1. US Naval Observatory, 3450 Massachusetts Ave. NW, Washington DC 20392-5420 (United States)
  2. Teza Technology, 150 N Michigan Ave., Chicago IL 60601 (United States)
Publication Date:
OSTI Identifier:
22663212
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 845; 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; AMPLITUDES; DATA ANALYSIS; DOPPLER EFFECT; PERIODICITY; VISIBLE RADIATION; WHITE DWARF STARS; X RADIATION

Citation Formats

Makarov, Valeri V., and Goldin, Alexey, E-mail: valeri.makarov@navy.mil, E-mail: alexey.goldin@gmail.com. Kepler Data on KIC 7341653: A Nearby M Dwarf with Monster Flares and a Phase-coherent Variability. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA7D06.
Makarov, Valeri V., & Goldin, Alexey, E-mail: valeri.makarov@navy.mil, E-mail: alexey.goldin@gmail.com. Kepler Data on KIC 7341653: A Nearby M Dwarf with Monster Flares and a Phase-coherent Variability. United States. doi:10.3847/1538-4357/AA7D06.
Makarov, Valeri V., and Goldin, Alexey, E-mail: valeri.makarov@navy.mil, E-mail: alexey.goldin@gmail.com. Sun . "Kepler Data on KIC 7341653: A Nearby M Dwarf with Monster Flares and a Phase-coherent Variability". United States. doi:10.3847/1538-4357/AA7D06.
@article{osti_22663212,
title = {Kepler Data on KIC 7341653: A Nearby M Dwarf with Monster Flares and a Phase-coherent Variability},
author = {Makarov, Valeri V. and Goldin, Alexey, E-mail: valeri.makarov@navy.mil, E-mail: alexey.goldin@gmail.com},
abstractNote = {KIC 7341653 is one of several late-type M dwarfs observed by the main mission of Kepler with peculiar infrared colors placing them in the domain of suspected young stellar objects (YSO). It is likely associated with a powerful X-ray emitter with X-ray flares. Kepler light curves reveal two distinct types of activity: frequent flares lasting from less than 30 minutes to a few hours, and a periodic variability with a period of 0.5463441(7) days. The largest detected flare increased the flux in the Kepler passband by a factor of 2.8 and released an estimated 4 × 10{sup 34} erg of energy in the Kepler band. Segmented periodogram analysis reveals that the amplitude of the periodic variation was subject to secular changes, dropping from peak values around 20 ppt to below 5 ppt toward the end of the mission, while the phase varied periodically with an amplitude of 0.15 rad and period 362(3) days. Two possible interpretations of the phase periodicity are discussed: a migrating long-lived photospheric spot, and a Doppler frequency shift generated by a solar-mass faint companion, such as a white dwarf.},
doi = {10.3847/1538-4357/AA7D06},
journal = {Astrophysical Journal},
number = 2,
volume = 845,
place = {United States},
year = {Sun Aug 20 00:00:00 EDT 2017},
month = {Sun Aug 20 00:00:00 EDT 2017}
}