Wavelets: a powerful tool for studying rotation, activity, and pulsation in Kepler and CoRoT stellar light curves

Bravo, J. P.; Roque, S.; Estrela, R.; Leão, I. C.; Medeiros, José Renan de

Wavelets: a powerful tool for studying rotation, activity, and pulsation in Kepler and CoRoT stellar light curves

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dc.contributor.author	Bravo, J. P.
dc.contributor.author	Roque, S.
dc.contributor.author	Estrela, R.
dc.contributor.author	Leão, I. C.
dc.contributor.author	Medeiros, José Renan de
dc.date.accessioned	2020-05-19T22:21:00Z
dc.date.available	2020-05-19T22:21:00Z
dc.date.issued	2014
dc.description.resumo	Aims. The wavelet transform has been used as a powerful tool for treating several problems in astrophysics. In this work, we show that the time–frequency analysis of stellar light curves using the wavelet transform is a ractical tool for identifying rotation, magnetic activity, and pulsation signatures. We present the wavelet spectral composition and multiscale variations of the time series for four classes of stars: targets dominated by magnetic activity, stars with transiting planets, those with binary transits, and pulsating stars. Methods. We applied the Morlet wavelet (6th order), which offers high time and frequency resolution. By applying the wavelet transform to the signal, we obtain the wavelet local and global power spectra. The first is interpreted as energy distribution of the signal in time–frequency space, and the second is obtained by time integration of the local map. Results. Since the wavelet transform is a useful mathematical tool for nonstationary signals, this technique applied to Kepler and CoRoT light curves allows us to clearly identify particular signatures for different phenomena. In particular, patterns were identified for the temporal evolution of the rotation period and other periodicity due to active regions affecting these light curves. In addition, a beat-pattern signature in the local wavelet map of pulsating stars over the entire time span was also detected.	pt_BR
dc.identifier.citation	MEDEIROS, José Renan de et al. Wavelets: a powerful tool for studying rotation, activity, and pulsation in and CoRoT stellar light curves. Astronomy & Astrophysics (Berlin. Print), v. 568, p. A34-44, 2014. ISSN 1432-0746 versão online. DOI https://doi.org/10.1051/0004-6361/201323032. Disponível em: https://www.aanda.org/articles/aa/abs/2014/08/aa23032-13/aa23032-13.html. Acesso em: 19 maio 2020. Reproduzido com permissão da Astronomy & Astrophysics, © ESO.	pt_BR
dc.identifier.doi	https://doi.org/10.1051/0004-6361/201323032
dc.identifier.issn	0004-6361 (print), 1432-0746 (online)
dc.identifier.uri	https://repositorio.ufrn.br/jspui/handle/123456789/29023
dc.language	en	pt_BR
dc.publisher	EDP Sciences	pt_BR
dc.subject	Methods: data analysis	pt_BR
dc.subject	Techniques: photometric	pt_BR
dc.subject	Stars: rotation	pt_BR
dc.subject	Stars: activity	pt_BR
dc.subject	Stars: oscillations	pt_BR
dc.subject	Binaries: eclipsing	pt_BR
dc.title	Wavelets: a powerful tool for studying rotation, activity, and pulsation in Kepler and CoRoT stellar light curves	pt_BR
dc.type	article	pt_BR