Detection of a giant flare displaying quasi-periodic pulsations from a pre-main-sequence M star by the Next Generation Transit Survey

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Details zur Publikation

Autor(en): Jackman JAG, Wheatley PJ, Pugh CE, Kolotkov DY, Broomhall AM, Kennedy GM, Murphy SJ, Raddi R, Burleigh MR, Casewell SL, Eigmueller P, Gillen E, Guenther MN, Jenkins JS, Louden T, Mccormac J, Raynard L, Poppenhaeger K, Udry S, Watson CA, West RG
Zeitschrift: Monthly Notices of the Royal Astronomical Society
Jahr der Veröffentlichung: 2019
Band: 482
Heftnummer: 4
Seitenbereich: 5553-5566
ISSN: 0035-8711
eISSN: 1365-2966


Abstract

We present the detection of an energetic flare on the pre-main-sequence M3 star NGTS J121939.5-355557, which we estimate to be only 2 Myr old. The flare had an energy of 3.2 +/-(0.4)(0.3) x 10(36) erg and a fractional amplitude of 7.2 +/- 0.8, making it one of the most energetic flares seen on an M star. The star is alsoX-ray active, in the saturated regime with log L-X/L-Bol = -3.1. In the flare's peak, we have identified multimode quasi-periodic pulsations formed of two statistically significant periods of approximately 320 and 660 s. This flare is one of the largest amplitude events to exhibit such pulsations. The shorter period mode is observed to start after a short-lived spike in flux lasting around 30 s, which would not have been resolved in Kepler or TESS short-cadence modes. Our data show how the high cadence of the Next Generation Transient Survey (NGTS) can be used to apply solar techniques to stellar flares and to identify potential causes of the observed oscillations. We also discuss the implications of this flare for the habitability of planets around M star hosts and how NGTS can help our understanding of this.


FAU-Autoren / FAU-Herausgeber

Raddi, Roberto
Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut


Autor(en) der externen Einrichtung(en)
Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)
Queen's University
Universidad de Santiago de Chile (USACH) / University of Santiago, Chile
Université de Genève (UNIGE) / University of Geneva
University of Cambridge
University of Leicester
University of New South Wales (UNSW)
University of Warwick


Zitierweisen

APA:
Jackman, J.A.G., Wheatley, P.J., Pugh, C.E., Kolotkov, D.Y., Broomhall, A.-M., Kennedy, G.M.,... West, R.G. (2019). Detection of a giant flare displaying quasi-periodic pulsations from a pre-main-sequence M star by the Next Generation Transit Survey. Monthly Notices of the Royal Astronomical Society, 482(4), 5553-5566. https://dx.doi.org/10.1093/mnras/sty3036

MLA:
Jackman, James A. G., et al. "Detection of a giant flare displaying quasi-periodic pulsations from a pre-main-sequence M star by the Next Generation Transit Survey." Monthly Notices of the Royal Astronomical Society 482.4 (2019): 5553-5566.

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Zuletzt aktualisiert 2019-29-04 um 15:36