Testing the recovery of stellar rotation signals from Kepler light curves using a blind hare-and-hounds exercise

Aigrain, S; Llama, J; Ceillier, T; Chagas, M. L. das; Davenport, J. R. A; García, R. A; Hay, K. L; Lanza, A. F; McQuillan, A; Mazeh, T; Medeiros, José Renan de; Nielsen, M. B; Reinhold, T

Testing the recovery of stellar rotation signals from Kepler light curves using a blind hare-and-hounds exercise

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dc.contributor.author	Aigrain, S
dc.contributor.author	Llama, J
dc.contributor.author	Ceillier, T
dc.contributor.author	Chagas, M. L. das
dc.contributor.author	Davenport, J. R. A
dc.contributor.author	García, R. A
dc.contributor.author	Hay, K. L
dc.contributor.author	Lanza, A. F
dc.contributor.author	McQuillan, A
dc.contributor.author	Mazeh, T
dc.contributor.author	Medeiros, José Renan de
dc.contributor.author	Nielsen, M. B
dc.contributor.author	Reinhold, T
dc.date.accessioned	2020-05-31T20:43:44Z
dc.date.available	2020-05-31T20:43:44Z
dc.date.issued	2015
dc.description.resumo	We present the results of a blind exercise to test the recoverability of stellar rotation and differential rotation in Kepler light curves. The simulated light curves lasted 1000 d and included activity cycles, Sun-like butterfly patterns, differential rotation and spot evolution. The range of rotation periods, activity levels and spot lifetime were chosen to be representative of the Kepler data of solar-like stars. Of the 1000 simulated light curves, 770 were injected into actual quiescent Kepler light curves to simulate Kepler noise. The test also included five 1000-d segments of the Sun's total irradiance variations at different points in the Sun's activity cycle. Five teams took part in the blind exercise, plus two teams who participated after the content of the light curves had been released. The methods used included Lomb–Scargle periodograms and variants thereof, autocorrelation function and wavelet-based analyses, plus spot modelling to search for differential rotation. The results show that the ‘overall’ period is well recovered for stars exhibiting low and moderate activity levels. Most teams reported values within 10 per cent of the true value in 70 per cent of the cases. There was, however, little correlation between the reported and simulated values of the differential rotation shear, suggesting that differential rotation studies based on full-disc light curves alone need to be treated with caution, at least for solar-type stars. The simulated light curves and associated parameters are available online for the community to test their own methods	pt_BR
dc.identifier.citation	Aigrain, S. ; LLAMA, J. ; CEILLIER, T. ; CHAGAS, M. L. D. ; DAVENPORT, J. R. A. ; Garcia, R. A. ; HAY, K. L. ; Lanza, A. F. ; MCQUILLAN, A. ; MAZEH, T. ; MEDEIROS, J. R. de ; NIELSEN, M. B. ; REINHOLD, T. . Testing the recovery of stellar rotation signals from Kepler light curves using a blind hare-and-hounds exercise. Monthly Notices of the Royal Astronomical Society (Print), v. 450, p. 3211-3226, 2015. Disponível em: https://academic.oup.com/mnras/article/450/3/3211/1072143. Acesso em: 26 Maio 2020. https://doi.org/10.1093/mnras/stv853	pt_BR
dc.identifier.doi	10.1093/mnras/stv853
dc.identifier.uri	https://repositorio.ufrn.br/jspui/handle/123456789/29105
dc.language	en	pt_BR
dc.publisher	Oxford University Press	pt_BR
dc.subject	Data analysis – techniques	pt_BR
dc.subject	Photometric – surveys – stars	pt_BR
dc.subject	Rotation – starspot	pt_BR
dc.title	Testing the recovery of stellar rotation signals from Kepler light curves using a blind hare-and-hounds exercise	pt_BR
dc.type	article	pt_BR