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Periodic stellar variability from almost a million NGTS light curves
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(2022) Periodic stellar variability from almost a million NGTS light curves. Monthly Notices of the Royal Astronomical Society, 513 (1). pp. 420-438. doi:10.1093/mnras/stac898 ISSN 1365-2966.
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Official URL: https://doi.org/10.1093/mnras/stac898
Abstract
We analyse 829,481 stars from the Next Generation Transit Survey (NGTS) to extract variability periods. We utilize a generalisation 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 days 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 days. 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 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): | Solar oscillations, Astronomical photometry, HR diagrams, Stars -- Rotation, Stellar activity | |||||||||||||||||||||||||||||||||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||||||||||||||||||||||||||||||||
| Publisher: | Oxford University Press (OUP) | |||||||||||||||||||||||||||||||||||||||
| ISSN: | 1365-2966 | |||||||||||||||||||||||||||||||||||||||
| Official Date: | June 2022 | |||||||||||||||||||||||||||||||||||||||
| Dates: |
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| Volume: | 513 | |||||||||||||||||||||||||||||||||||||||
| Number: | 1 | |||||||||||||||||||||||||||||||||||||||
| Page Range: | pp. 420-438 | |||||||||||||||||||||||||||||||||||||||
| DOI: | 10.1093/mnras/stac898 | |||||||||||||||||||||||||||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||||||||||||||||||||||||||
| Publication Status: | Published | |||||||||||||||||||||||||||||||||||||||
| Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||||||||||||||||||||||||||
| Copyright Holders: | © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. | |||||||||||||||||||||||||||||||||||||||
| Date of first compliant deposit: | 19 May 2022 | |||||||||||||||||||||||||||||||||||||||
| Date of first compliant Open Access: | 19 May 2022 | |||||||||||||||||||||||||||||||||||||||
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