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Ground-based detection of G star superflares with NGTS
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(2018) Ground-based detection of G star superflares with NGTS. Monthly Notices of the Royal Astronomical Society, 477 (4). pp. 4655-4664. doi:10.1093/mnras/sty897 ISSN 1365-2966.
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Official URL: http://doi.org/10.1093/mnras/sty897
Abstract
We present high cadence detections of two superflares from a bright G8 star (V = 11.56) with the Next Generation Transit Survey (NGTS). We improve upon previous superflare detections by resolving the flare rise and peak, allowing us to fit a solar flare inspired model without the need for arbitrary break points between rise and decay. Our data also enables us to identify substructure in the flares. From changing star-spot modulation in the NGTS data, we detect a stellar rotation period of 59 h, along with evidence for differential rotation. We combine this rotation period with the observed ROSAT X-ray flux to determine that the star’s X-ray activity is saturated. We calculate the flare bolometric energies as
5.4 + 0.8
−0.7 ×1034
and
2.6 + 0.4
−0.3 × 1034 erg
and compare our detections with G star superflares detected in the Kepler survey. We find our main flare to be one of the largest amplitude superflares detected from a bright G star. With energies more than 100 times greater than the Carrington event, our flare detections demonstrate the role that ground-based instruments such as NGTS can have in assessing the habitability of Earth-like exoplanets, particularly in the era of PLATO.
Item Type: | Journal Article | |||||||||||||||||||||||||||||||||||||||||||||||||||
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Subjects: | Q Science > QB Astronomy | |||||||||||||||||||||||||||||||||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||||||||||||||||||||||||||||||||
SWORD Depositor: | Library Publications Router | |||||||||||||||||||||||||||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Flare stars, Next Generation Transit Survey (NGTS), Stars -- Rotation | |||||||||||||||||||||||||||||||||||||||||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||||||||||||||||||||||||||||||||||||||||||||
Publisher: | Oxford University Press (OUP) | |||||||||||||||||||||||||||||||||||||||||||||||||||
ISSN: | 1365-2966 | |||||||||||||||||||||||||||||||||||||||||||||||||||
Official Date: | 11 July 2018 | |||||||||||||||||||||||||||||||||||||||||||||||||||
Dates: |
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Volume: | 477 | |||||||||||||||||||||||||||||||||||||||||||||||||||
Number: | 4 | |||||||||||||||||||||||||||||||||||||||||||||||||||
Page Range: | pp. 4655-4664 | |||||||||||||||||||||||||||||||||||||||||||||||||||
DOI: | 10.1093/mnras/sty897 | |||||||||||||||||||||||||||||||||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||||||||||||||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||||||||||||||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||||||||||||||||||||||||||||||||||||||
Date of first compliant deposit: | 12 July 2018 | |||||||||||||||||||||||||||||||||||||||||||||||||||
Date of first compliant Open Access: | 12 July 2018 | |||||||||||||||||||||||||||||||||||||||||||||||||||
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