Periodic stellar variability from almost a million NGTS light curves

Briegal, Joshua T.; Gillen, Edward; Queloz, Didier; Hodgkin, Simon; Acton, Jack S.; Anderson, David R.; Armstrong, David J.; Battley, Matthew P.; Bayliss, Daniel; Burleigh, Matthew R.; Bryant, Edward M.; Casewell, Sarah L.; Costes, Jean C.; Eigmuller, Philipp; Gill, Samuel; Goad, Michael R.; Gunther, Maximilian N.; Henderson, Beth A.; Jackman, James A. G.; Jenkins, James S.; Kreutzer , Lars T.; Moyano, Maximiliano; Lendl, Monika; Smith, Gareth D.; Tilbrook, Rosanna H.; Watson, Christopher A.; West, Richard G.; Wheatley, Peter J.

doi:10.1093/mnras/stac898

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学術論文

Periodic stellar variability from almost a million NGTS light curves

MPS-Authors

Kreutzer , Lars T.
AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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引用

Briegal, J. T., Gillen, E., Queloz, D., Hodgkin, S., Acton, J. S., Anderson, D. R., Armstrong, D. J., Battley, M. P., Bayliss, D., Burleigh, M. R., Bryant, E. M., Casewell, S. L., Costes, J. C., Eigmuller, P., Gill, S., Goad, M. R., Gunther, M. N., Henderson, B. A., Jackman, J. A. G., Jenkins, J. S., Kreutzer, L. T., Moyano, M., Lendl, M., Smith, G. D., Tilbrook, R. H., Watson, C. A., West, R. G., & Wheatley, P. J. (2022). Periodic stellar variability from almost a million NGTS light curves. Monthly Notices of the Royal Astronomical Society, 53(1), 420-438. doi:10.1093/mnras/stac898.

引用: https://hdl.handle.net/21.11116/0000-000A-7015-0

要旨

We analyse 829,481 stars from the Next Generation Transit Survey (NGTS) to
extract variability periods. We utilise 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.