(2019) Detection of a giant flare displaying quasi-periodic pulsations from a pre-main sequence M star with NGTS. Monthly Notices of the Royal Astronomical Society, 482 (4). pp. 5553-5566. 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±0.40.3×1036 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 Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QB Astronomy |
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics |
| Library of Congress Subject Headings (LCSH): | M stars |
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society |
| Publisher: | Oxford University Press |
| ISSN: | 0035-8711 |
| Official Date: | 1 February 2019 |
| Dates: | Date Event 1 February 2019 Published 1 December 2018 Available 5 November 2018 Accepted |
| Volume: | 482 |
| Number: | 4 |
| Page Range: | pp. 5553-5566 |
| DOI: | 10.1093/mnras/sty3036 |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Re-use Statement: | 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 James A G Jackman, Peter J Wheatley, Chloe E Pugh, Dmitrii Y Kolotkov, Anne-Marie Broomhall, Grant M Kennedy, Simon J Murphy, Roberto Raddi, Matthew R Burleigh, Sarah L Casewell, Philipp Eigmüller, Edward Gillen, Maximilian N Günther, James S Jenkins, Tom Louden, James McCormac, Liam Raynard, Katja Poppenhaeger, Stéphane Udry, Christopher A Watson, Richard G West; 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, Volume 482, Issue 4, 1 February 2019, Pages 5553–5566, https://doi.org/10.1093/mnras/sty3036is available online at: https://doi.org/10.1093/mnras/sty3036 |
| Access rights to Published version: | Restricted or Subscription Access |
| Date of first compliant deposit: | 7 November 2018 |
| Date of first compliant Open Access: | 19 December 2018 |
| RIOXX Funder/Project Grant: | Project/Grant ID RIOXX Funder Name Funder ID Großinvestition GI-NGTS Deutsches Zentrum für Luft- und Raumfahrt PhD studentship 1763096. [STFC] Science and Technology Facilities Council 1161218 [FONDECYT] Fondo Nacional de Desarrollo Científico y Tecnológico PB06 [CONICYT] Comisión Nacional de Investigación Científica y Tecnológica Commonwealth Education Investment Fund (EIF) Australia. Government UNSPECIFIED National Collaborative Research Infrastructure Strategy (NCRIS) Australia. Government UNSPECIFIED National eResearch Collaboration Tools and Resources (NeCTAR) Australia. Government UNSPECIFIED Australian National Data Service Projects (ANDS) Australia. Government UNSPECIFIED |
| Related URLs: | |
| URI: | https://wrap.warwick.ac.uk/110593/ |
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