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A multi-period oscillation in a stellar superflare
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Pugh, Chloe E., Nakariakov, V. M. (Valery M.) and Broomhall, Anne-Marie (2015) A multi-period oscillation in a stellar superflare. Astrophysical Journal Letters, 813 (1). L5. doi:10.1088/2041-8205/813/1/L5
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Official URL: http://dx.doi.org/10.1088/2041-8205/813/1/L5
Abstract
Flares that are orders of magnitude larger than the most energetic solar flares are routinely observed on Sun-like stars, raising the question of whether the same physical processes are responsible for both solar and stellar flares. In this Letter, we present a white-light stellar superflare on the star KIC 9655129, observed by NASA's Kepler mission, with a rare multi-period quasi-periodic pulsation (QPP) pattern. Two significant periodic processes were detected using the wavelet and autocorrelation techniques, with periods of 78 ± 12 minutes and 32 ± 2 minutes. By comparing the phases and decay times of the two periodicities, the QPP signal was found to most likely be linear, suggesting that the two periodicities are independent, possibly corresponding either to different magnetohydrodynamic (MHD) modes of the flaring region or different spatial harmonics of the same mode. The presence of multiple periodicities is a good indication that the QPPs were caused by MHD oscillations and suggests that the physical processes in operation during stellar flares could be the same as those in solar flares.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||||||
| Divisions: | Faculty of Science > Physics | ||||||||
| Library of Congress Subject Headings (LCSH): | Solar flares, Stellar oscillations , Pulsating stars | ||||||||
| Journal or Publication Title: | Astrophysical Journal Letters | ||||||||
| Publisher: | IOP Publishing Ltd | ||||||||
| ISSN: | 2041-8213 | ||||||||
| Official Date: | 23 October 2015 | ||||||||
| Dates: |
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| Volume: | 813 | ||||||||
| Number: | 1 | ||||||||
| Article Number: | L5 | ||||||||
| DOI: | 10.1088/2041-8205/813/1/L5 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| Funder: | European Research Council (ERC), Science and Technology Facilities Council (Great Britain) (STFC), University of Warwick. Institute of Advanced Study (IAS), United States. National Aeronautics and Space Administration (NASA) | ||||||||
| Grant number: | 321141 (ERC), ST/L000733/1 (STFC) |
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