Wavelets: a powerful tool for studying rotation, activity, and pulsation in Kepler and CoRoT stellar light curves
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRN |
Texto Completo: | https://repositorio.ufrn.br/jspui/handle/123456789/29023 https://doi.org/10.1051/0004-6361/201323032 |
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. |
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Bravo, J. P.Roque, S.Estrela, R.Leão, I. C.Medeiros, José Renan de2020-05-19T22:21:00Z2020-05-19T22:21:00Z2014MEDEIROS, 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.0004-6361 (print), 1432-0746 (online)https://repositorio.ufrn.br/jspui/handle/123456789/29023https://doi.org/10.1051/0004-6361/201323032EDP SciencesMethods: data analysisTechniques: photometricStars: rotationStars: activityStars: oscillationsBinaries: eclipsingWavelets: a powerful tool for studying rotation, activity, and pulsation in Kepler and CoRoT stellar light curvesinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleAims. 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.engreponame:Repositório Institucional da UFRNinstname:Universidade Federal do Rio Grande do Norte (UFRN)instacron:UFRNinfo:eu-repo/semantics/openAccessORIGINALWaveletsAPowerfulToolForStudyingRotationActivity_Medeiros_2014.pdfWaveletsAPowerfulToolForStudyingRotationActivity_Medeiros_2014.pdfapplication/pdf6249889https://repositorio.ufrn.br/bitstream/123456789/29023/1/WaveletsAPowerfulToolForStudyingRotationActivity_Medeiros_2014.pdf85fa1c71646361f0dc45f236c036e9c4MD51LICENSElicense.txtlicense.txttext/plain; charset=utf-81484https://repositorio.ufrn.br/bitstream/123456789/29023/2/license.txte9597aa2854d128fd968be5edc8a28d9MD52TEXTWaveletsAPowerfulToolForStudyingRotationActivity_Medeiros_2014.pdf.txtWaveletsAPowerfulToolForStudyingRotationActivity_Medeiros_2014.pdf.txtExtracted texttext/plain53827https://repositorio.ufrn.br/bitstream/123456789/29023/3/WaveletsAPowerfulToolForStudyingRotationActivity_Medeiros_2014.pdf.txta926e5d5fc66a1b6b6b11373bda67f16MD53THUMBNAILWaveletsAPowerfulToolForStudyingRotationActivity_Medeiros_2014.pdf.jpgWaveletsAPowerfulToolForStudyingRotationActivity_Medeiros_2014.pdf.jpgGenerated Thumbnailimage/jpeg1648https://repositorio.ufrn.br/bitstream/123456789/29023/4/WaveletsAPowerfulToolForStudyingRotationActivity_Medeiros_2014.pdf.jpg787c6b087d9c87c8da8c4747b42d7e9bMD54123456789/290232020-05-24 06:21:14.103oai:https://repositorio.ufrn.br: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Repositório de PublicaçõesPUBhttp://repositorio.ufrn.br/oai/opendoar:2020-05-24T09:21:14Repositório Institucional da UFRN - Universidade Federal do Rio Grande do Norte (UFRN)false |
dc.title.pt_BR.fl_str_mv |
Wavelets: a powerful tool for studying rotation, activity, and pulsation in Kepler and CoRoT stellar light curves |
title |
Wavelets: a powerful tool for studying rotation, activity, and pulsation in Kepler and CoRoT stellar light curves |
spellingShingle |
Wavelets: a powerful tool for studying rotation, activity, and pulsation in Kepler and CoRoT stellar light curves Bravo, J. P. Methods: data analysis Techniques: photometric Stars: rotation Stars: activity Stars: oscillations Binaries: eclipsing |
title_short |
Wavelets: a powerful tool for studying rotation, activity, and pulsation in Kepler and CoRoT stellar light curves |
title_full |
Wavelets: a powerful tool for studying rotation, activity, and pulsation in Kepler and CoRoT stellar light curves |
title_fullStr |
Wavelets: a powerful tool for studying rotation, activity, and pulsation in Kepler and CoRoT stellar light curves |
title_full_unstemmed |
Wavelets: a powerful tool for studying rotation, activity, and pulsation in Kepler and CoRoT stellar light curves |
title_sort |
Wavelets: a powerful tool for studying rotation, activity, and pulsation in Kepler and CoRoT stellar light curves |
author |
Bravo, J. P. |
author_facet |
Bravo, J. P. Roque, S. Estrela, R. Leão, I. C. Medeiros, José Renan de |
author_role |
author |
author2 |
Roque, S. Estrela, R. Leão, I. C. Medeiros, José Renan de |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Bravo, J. P. Roque, S. Estrela, R. Leão, I. C. Medeiros, José Renan de |
dc.subject.por.fl_str_mv |
Methods: data analysis Techniques: photometric Stars: rotation Stars: activity Stars: oscillations Binaries: eclipsing |
topic |
Methods: data analysis Techniques: photometric Stars: rotation Stars: activity Stars: oscillations Binaries: eclipsing |
description |
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. |
publishDate |
2014 |
dc.date.issued.fl_str_mv |
2014 |
dc.date.accessioned.fl_str_mv |
2020-05-19T22:21:00Z |
dc.date.available.fl_str_mv |
2020-05-19T22:21:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
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. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufrn.br/jspui/handle/123456789/29023 |
dc.identifier.issn.none.fl_str_mv |
0004-6361 (print), 1432-0746 (online) |
dc.identifier.doi.none.fl_str_mv |
https://doi.org/10.1051/0004-6361/201323032 |
identifier_str_mv |
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. 0004-6361 (print), 1432-0746 (online) |
url |
https://repositorio.ufrn.br/jspui/handle/123456789/29023 https://doi.org/10.1051/0004-6361/201323032 |
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eng |
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openAccess |
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EDP Sciences |
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