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dc.rights.license© ESO 2019-
dc.contributor.authorFuhrmeister, B.-
dc.contributor.authorCzesla, S.-
dc.contributor.authorSchmitt, J. H. M. M.-
dc.contributor.authorJohnson, E. N.-
dc.contributor.authorSchöfer, P.-
dc.contributor.authorJeffers, S. V.-
dc.contributor.authorCaballero, J. A.-
dc.contributor.authorZechmeister, M.-
dc.contributor.authorReiners, A.-
dc.contributor.authorRibas, I.-
dc.contributor.authorAmado, P. J.-
dc.contributor.authorQuirrenbach, A.-
dc.contributor.authorBauer, F. F.-
dc.contributor.authorBéjar, V. J. S.-
dc.contributor.authorCortés Contreras, M.-
dc.contributor.authorDíez Alonso, E.-
dc.contributor.authorDreizler, S.-
dc.contributor.authorGaladí Enríquez, D.-
dc.contributor.authorGuenther, E. W.-
dc.contributor.authorKaminski, A.-
dc.contributor.authorKürster, M.-
dc.contributor.authorLafarga, M.-
dc.contributor.authorMontes, D.-
dc.contributor.otherUnidad de Excelencia Científica María de Maeztu Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737-
dc.identifier.citationAstronomy and Astrophysics 623: A24(2019)es
dc.description.abstractWe use spectra from CARMENES, the Calar Alto high-Resolution search for M dwarfs with Exo-earths with Near-infrared and optical Echelle Spectrographs, to search for periods in chromospheric indices in 16 M0–M2 dwarfs. We measure spectral indices in the Hα, the Ca II infrared triplet (IRT), and the Na I D lines to study which of these indices are best-suited to finding rotation periods in these stars. Moreover, we test a number of different period-search algorithms, namely the string length method, the phase dispersion minimisation, the generalized Lomb–Scargle periodogram, and the Gaussian process regression with quasi-periodic kernel. We find periods in four stars using Hα and in five stars using the Ca II IRT, two of which have not been found before. Our results show that both Hα and the Ca II IRT lines are well suited for period searches, with the Ca II IRT index performing slightly better than Hα. Unfortunately, the Na I D lines are strongly affected by telluric airglow, and we could not find any rotation period using this index. Further, different definitions of the line indices have no major impact on the results. Comparing the different search methods, the string length method and the phase dispersion minimisation perform worst, while Gaussian process models produce the smallest numbers of false positives and
dc.description.sponsorshipB.F. acknowledges funding by the DFG under Cz 222/1-1. CARMENES is an instrument for the Centro Astronómico Hispano-Alemán de Calar Alto (CAHA, Almería, Spain). CARMENES is funded by the German Max-Planck-Gesellschaft (MPG), the Spanish Consejo Superior de Investigaciones Científicas (CSIC), the European Union through FEDER/ERF FICTS-2011-02 funds, and the members of the CARMENES Consortium (Max-Planck-Institut für Astronomie, Instituto de Astrofísica de Andalucía, Landessternwarte Königstuhl, Institut de Ciències de l’Espai, Institut für Astrophysik Göttingen, Universidad Complutense de Madrid, Thüringer Landessternwarte Tautenburg, Instituto de Astrofísica de Canarias, Hamburger Sternwarte, Centro de Astrobiología and Centro Astronómico Hispano-Alemán), with additional contributions by the Spanish Ministry of Economy, the German Science Foundation through the Major Research Instrumentation Programme and DFG Research Unit FOR2544 “Blue Planets around Red Stars”, the Klaus Tschira Stiftung, the states of Baden-Württemberg and Niedersachsen, and by the Junta de Andalucía; With funding from the Spanish government through the "María de Maeztu Unit of Excellence" accreditation (MDM-2017-0737).es
dc.publisherEDP Scienceses
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.subjectStars: activityes
dc.subjectStars: chromosphereses
dc.subjectStars: late typees
dc.subjectStars: rotationes
dc.titleThe CARMENES search for exoplanets around M dwarfs Period search in Hα, Na I D, and Ca II IRT lineses
dc.contributor.funderDeutsche Forschungsgemeinschaft (DFG)-
dc.description.peerreviewedPeer reviewes
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