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| Verfasst von: | Zechmeister, Mathias [VerfasserIn]  |
| Reiners, A. [VerfasserIn] | |
| Amado, P. J. [VerfasserIn] | |
| Azzaro, M. [VerfasserIn] | |
| Bauer, F. F. [VerfasserIn] | |
| Béjar, V. J. S. [VerfasserIn] | |
| Caballero, J. A. [VerfasserIn] | |
| Guenther, E. W. [VerfasserIn] | |
| Hagen, H.-J. [VerfasserIn] | |
| Jeffers, S. V. [VerfasserIn] | |
| Kaminski, Adrian [VerfasserIn] | |
| Kürster, M. [VerfasserIn] | |
| Launhardt, R. [VerfasserIn] | |
| Montes, D. [VerfasserIn] | |
| Morales, J. C. [VerfasserIn] | |
| Quirrenbach, Andreas [VerfasserIn] | |
| Reffert, Sabine [VerfasserIn] | |
| Ribas, I. [VerfasserIn] | |
| Seifert, Walter [VerfasserIn] | |
| Tal-Or, L. [VerfasserIn] | |
| Wolthoff, Vera [VerfasserIn] | |
| Titel: | Spectrum radial velocity analyser (SERVAL) |
| Titelzusatz: | high-precision radial velocities and two alternative spectral indicators |
| Verf.angabe: | M. Zechmeister, A. Reiners, P.J. Amado, M. Azzaro, F.F. Bauer, V.J.S. Béjar, J.A. Caballero, E.W. Guenther, H.-J. Hagen, S.V. Jeffers, A. Kaminski, M. Kürster, R. Launhardt, D. Montes, J.C. Morales, A. Quirrenbach, S. Reffert, I. Ribas, W. Seifert, L. Tal-Or, and V. Wolthoff |
| Jahr: | 2018 |
| Jahr des Originals: | 2017 |
| Umfang: | 13 S. |
| Fussnoten: | Published online 22 December 2017 ; Gesehen am 17.03.2020 |
| Titel Quelle: | Enthalten in: Astronomy and astrophysics |
| Ort Quelle: | Les Ulis : EDP Sciences, 1969 |
| Jahr Quelle: | 2018 |
| Band/Heft Quelle: | 609(2018) Artikel-Nummer A12, 13 Seiten |
| ISSN Quelle: | 1432-0746 |
| Abstract: | <i>Context. <i/>The CARMENES survey is a high-precision radial velocity (RV) programme that aims to detect Earth-like planets orbiting low-mass stars.<i>Aims. <i/>We develop least-squares fitting algorithms to derive the RVs and additional spectral diagnostics implemented in the SpEctrum Radial Velocity AnaLyser (SERVAL), a publicly available python code.<i>Methods. <i/>We measured the RVs using high signal-to-noise templates created by coadding all available spectra of each star. We define the chromatic index as the RV gradient as a function of wavelength with the RVs measured in the echelle orders. Additionally, we computed the differential line width by correlating the fit residuals with the second derivative of the template to track variations in the stellar line width.<i>Results. <i/>Using HARPS data, our SERVAL code achieves a RV precision at the level of 1 m/s. Applying the chromatic index to CARMENES data of the active star YZ CMi, we identify apparent RV variations induced by stellar activity. The differential line width is found to be an alternative indicator to the commonly used full width half maximum.<i>Conclusions. <i/>We find that at the red optical wavelengths (700-900 nm) obtained by the visual channel of CARMENES, the chromatic index is an excellent tool to investigate stellar active regions and to identify and perhaps even correct for activity-induced RV variations. |
| DOI: | doi:10.1051/0004-6361/201731483 |
| URL: | Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt. Volltext ; Verlag: https://doi.org/10.1051/0004-6361/201731483 |
| Volltext: https://www.aanda.org/articles/aa/abs/2018/01/aa31483-17/aa31483-17.html | |
| DOI: https://doi.org/10.1051/0004-6361/201731483 | |
| Datenträger: | Online-Ressource |
| Sprache: | eng |
| K10plus-PPN: | 1692704397 |
| Verknüpfungen: | → Zeitschrift |
