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

Jackman, James A.G. and Wheatley, P. and Pugh, Chloe E. and Kolotkov, Dmitrii Y. and Broomhall, Anne-MArie and Kennedy, G M and Murphy, Simon J. and Raddi, Roberto and Burleigh, M. and Casewell, S and Eigmüller, Philipp and Gillen, E. and Günther, Maximilian N. and Jenkins, J. and Louden, T and McCormac, James and Raynard, L. and Poppenhaeger, Katja and Udry, S and Watson, C. and West, Richard 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), pp. 5553-5566. Oxford University Press. DOI: 10.1093/mnras/sty3036 ISSN 0035-8711

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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}× 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 also X-ray active, in the saturated regime with log LX/LBol = -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.

Item URL in elib:https://elib.dlr.de/127790/
Document Type:Article
Title:Detection of a giant flare displaying quasi-periodic pulsations from a pre-main-sequence M star by the Next Generation Transit Survey
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Jackman, James A.G.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7ALUNSPECIFIED
Wheatley, P.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7ALUNSPECIFIED
Pugh, Chloe E.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7ALUNSPECIFIED
Kolotkov, Dmitrii Y.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7ALUNSPECIFIED
Broomhall, Anne-MArieDepartment of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK; Institute of Advanced Studies, University of Warwick, Coventry CV4UNSPECIFIED
Kennedy, G MDepartment of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7ALUNSPECIFIED
Murphy, Simon J.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7ALUNSPECIFIED
Raddi, RobertoDepartment of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Burleigh, M.Dept. of Physics and Astronomy, University of Leicester, United KingdomUNSPECIFIED
Casewell, SDepartment of Physics and Astronomy, Leicester Institute of Space and Earth Observation, University of Leicester, University Road, Leicester LE1 7RHUNSPECIFIED
Eigmüller, PhilippPhilipp.Eigmueller (at) dlr.dehttps://orcid.org/0000-0003-4096-0594
Gillen, E.Institute of Astronomy, University of Cambridge, United KingdomUNSPECIFIED
Günther, Maximilian N.Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIED
Jenkins, J.Departamento de Astronomía, Universidad de Chile, Santiago, ChileUNSPECIFIED
Louden, TDepartment of Physics, University of Warwick, UKUNSPECIFIED
McCormac, JamesDepartment of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Raynard, L.Department of Physics and Astronomy, Leicester Institute of Space and Earth Observation, University of Leicester, LE1 7RH, UKUNSPECIFIED
Poppenhaeger, KatjaAstrophysics Research Centre, Queen's University of Belfast, 1 University Road, Belfast BT7 1NNUNSPECIFIED
Udry, SObservatoire de GenèveUNSPECIFIED
Watson, C.astrophysics research centre, queens university belfast, united kingdomUNSPECIFIED
West, Richard G.Department of Physics, University of Warwick, UKUNSPECIFIED
Date:2019
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:482
DOI :10.1093/mnras/sty3036
Page Range:pp. 5553-5566
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:stars: flare, stars: individual: NGTS J121939.5-355557, stars: low-mass, stars: pre-main-sequence, Astrophysics - Solar and Stellar Astrophysics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Project PLATO
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Eigmüller, Dr. Philipp
Deposited On:13 Jun 2019 10:45
Last Modified:06 Sep 2019 15:17

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