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Periodic stellar variability from almost a million NGTS light curves

Briegal, Joshua T. and Gillen, Edward and Queloz, Didier and Hodgkin, Simon T. and Acton, Jack S. and Anderson, David R. and Armstrong, David J. and Battley, Matthew P. and Bayliss, Daniel and Burleigh, Matthew R. and Bryant, Edward M. and Casewell, Sarah L. and Costes, Jean C. and Eigmüller, Philipp and Gill, Samuel and Goad, Michael R. and Gunther, Maximilian N. and Henderson, Beth A. and Jackman, James A.-G. and Jenkins, James S. and Kreutzer, Lars T. and Moyano, Maximiliano and Lendl, Monika and Smith, Gareth D. and Tilbrook, Rosanna H. and Watson, Christopher A. and West, Richard G. and Wheatley, Peter J. (2022) Periodic stellar variability from almost a million NGTS light curves. Monthly Notices of the Royal Astronomical Society, 513 (1), pp. 420-438. Oxford University Press. doi: 10.1093/mnras/stac898. ISSN 0035-8711.

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Official URL: https://academic.oup.com/mnras/article/513/1/420/6563704

Abstract

We analyse 829 481 stars from the Next Generation Transit Survey (NGTS) to extract variability periods. We utilize a generalization of the autocorrelation function (the G-ACF), which applies to irregularly sampled time series data. We extract variability periods for 16 880 stars from late-A through to mid-M spectral types and periods between ~0.1 and 130 d with no assumed variability model. We find variable signals associated with a number of astrophysical phenomena, including stellar rotation, pulsations, and multiple-star systems. The extracted variability periods are compared with stellar parameters taken from Gaia DR2, which allows us to identify distinct regions of variability in the Hertzsprung-Russell Diagram. We explore a sample of rotational main-sequence objects in period-colour space, in which we observe a dearth of rotation periods between 15 and 25 d. This 'bi-modality' was previously only seen in space-based data. We demonstrate that stars in sub-samples above and below the period gap appear to arise from a stellar population not significantly contaminated by excess multiple systems. We also observe a small population of long-period variable M-dwarfs, which highlight a departure from the predictions made by rotational evolution models fitted to solar-type main-sequence objects. The NGTS data spans a period and spectral type range that links previous rotation studies such as those using data from Kepler, K2, and MEarth.

Item URL in elib:https://elib.dlr.de/188425/
Document Type:Article
Title:Periodic stellar variability from almost a million NGTS light curves
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Briegal, Joshua T.Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIED
Gillen, EdwardAstrophysics Group, Cavendish Laboratory , J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIED
Queloz, DidierAstrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIED
Hodgkin, Simon T.University of CambridgeUNSPECIFIED
Acton, Jack S.Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Anderson, David R.Department 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
Armstrong, David J.Department 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, UKhttps://orcid.org/0000-0002-5080-4117
Battley, Matthew P.Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK; Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Bayliss, DanielUniversity of Warwick, Department of Physics, Gibbet Hill Road, Coventry, CV4 7AL, UKUNSPECIFIED
Burleigh, Matthew R.Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Bryant, Edward M.Department 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
Casewell, Sarah L.Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Costes, Jean C.Astrophysics Research Centre, Queen's University Belfast, 1 University Road, Belfast BT7 1NN, UKUNSPECIFIED
Eigmüller, PhilippPhilipp.Eigmueller (at) dlr.dehttps://orcid.org/0000-0003-4096-0594
Gill, SamuelCentre for Exoplanets and Habitability, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, UK Dept. of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Goad, Michael R.Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Gunther, Maximilian N.Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Henderson, Beth A.School of Physics and Astronomy, University of Leicester, LE1 7RH, UKUNSPECIFIED
Jackman, James A.-G.Department 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
Jenkins, James S.Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago, Chile; Centro de Astrofísica y Tecnologías Afines (CATA), Casilla 36-D, Santiago, ChileUNSPECIFIED
Kreutzer, Lars T.Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge, UK; Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge, UK; Max Planck Institute for Gravitational Physics, Golm, GermanyUNSPECIFIED
Moyano, MaximilianoInstituto de Astronomía, Universidad Católica del Norte , Angamos 0610, 1270709 Antofagasta, ChileUNSPECIFIED
Lendl, MonikaObservatoire Astronomique de l'Université de Genéve, Versoix, Switzerland; Space Research Institute, Austrian Academy of Sciences, Graz, AustriaUNSPECIFIED
Smith, Gareth D.Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIED
Tilbrook, Rosanna H.Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Watson, Christopher A.Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UKUNSPECIFIED
West, Richard G.Department 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
Wheatley, Peter J.University of Warwick, Department of Physics, Gibbet Hill Road, Coventry, CV4 7AL, UKUNSPECIFIED
Date:2022
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:513
DOI:10.1093/mnras/stac898
Page Range:pp. 420-438
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:methods: data-analysis, techniques: photometric, stars: activity, Hertzprung-Russell and colour-magnitude diagrams, stars: rotation, stars: variables: general, Astrophysics - Solar and Stellar Astrophysics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project PLATO - PMC and Science
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Eigmüller, Dr. Philipp
Deposited On:22 Sep 2022 16:23
Last Modified:11 Jan 2023 12:57

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