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Stellar flare oscillations : evidence for oscillatory reconnection and evolution of MHD modes
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Doyle, J. G., Shetye, Julie, Antonova, A. E., Kolotkov, Dmitrii, Srivastava, A. K., Stangalini, M., Gupta, G. R., Avramova, A. and Mathioudakis, M. (2018) Stellar flare oscillations : evidence for oscillatory reconnection and evolution of MHD modes. Monthly Notices of the Royal Astronomical Society, 475 (2). pp. 2842-2851. doi:10.1093/mnras/sty032 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/sty032
Abstract
Here, we report on the detection of a range of quasi-periodic pulsations (20–120 s; QPPs) observed during flaring activity of several magnetically active dMe stars, namely AF Psc, CR Dra, GJ 3685A, Gl 65, SDSS J084425.9+513830, and SDSS J144738.47+035312.1 in the GALEX NUV filter. Based on a solar analogy, this work suggests that many of these flares may be triggered by external drivers creating a periodic reconnection in the flare current sheet or an impulsive energy release giving rise to an avalanche of periodic bursts that occur at time intervals that correspond to the detected periods, thus generating QPPs in their rising and peak phases. Some of these flares also show fast QPPs in their decay phase, indicating the presence of fast sausage mode oscillations either driven externally by periodic reconnection or intrinsically in the post-flare loop system during the flare energy release.
Item Type: | Journal Article | |||||||||||||||||||||||||||
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Subjects: | Q Science > QB Astronomy | |||||||||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Flare stars, Ultraviolet stars, Magnetohydrodynamics | |||||||||||||||||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||||||||||||||||||||
Publisher: | Wiley | |||||||||||||||||||||||||||
ISSN: | 0035-8711 | |||||||||||||||||||||||||||
Official Date: | 1 April 2018 | |||||||||||||||||||||||||||
Dates: |
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Volume: | 475 | |||||||||||||||||||||||||||
Number: | 2 | |||||||||||||||||||||||||||
Page Range: | pp. 2842-2851 | |||||||||||||||||||||||||||
DOI: | 10.1093/mnras/sty032 | |||||||||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||||||||
Reuse Statement (publisher, data, author rights): | This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record J G Doyle, J Shetye, A E Antonova, D Y Kolotkov, A K Srivastava, M Stangalini, G R Gupta, A Avramova, M Mathioudakis; Stellar flare oscillations: evidence for oscillatory reconnection and evolution of MHD modes, Monthly Notices of the Royal Astronomical Society, Volume 475, Issue 2, 1 April 2018, Pages 2842–2851. is available online at: https://doi.org/10.1093/mnras/sty032 | |||||||||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||||||||||||||
Date of first compliant deposit: | 7 November 2018 | |||||||||||||||||||||||||||
Date of first compliant Open Access: | 7 November 2018 | |||||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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