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  Spectrum radial velocity analyser (SERVAL). High-precision radial velocities and two alternative spectral indicators

Zechmeister, M., Reiners, A., Amado, P. J., Azzaro, M., Bauer, F. F., Béjar, V. J. S., et al. (2018). Spectrum radial velocity analyser (SERVAL). High-precision radial velocities and two alternative spectral indicators. Astronomy and Astrophysics, 609.

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https://ui.adsabs.harvard.edu/abs/2018A&A...609A..12Z (beliebiger Volltext)
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 Urheber:
Zechmeister, M.1, Autor
Reiners, A.1, Autor
Amado, P. J.1, Autor
Azzaro, M.1, Autor
Bauer, F. F.1, Autor
Béjar, V. J. S.1, Autor
Caballero, J. A.1, Autor
Guenther, E. W.1, Autor
Hagen, H. -J.1, Autor
Jeffers, S. V.1, Autor
Kaminski, A.1, Autor
Kürster, M.1, Autor
Launhardt, R.1, Autor
Montes, D.1, Autor
Morales, J. C.1, Autor
Quirrenbach, A.1, Autor
Reffert, S.1, Autor
Ribas, I.1, Autor
Seifert, W.1, Autor
Tal-Or, L.1, Autor
Wolthoff, V.1, Autor mehr..
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Schlagwörter: methods: data analysis techniques: radial velocities techniques: spectroscopic planets and satellites: detection Astrophysics - Instrumentation and Methods for Astrophysics Astrophysics - Earth and Planetary Astrophysics Astrophysics - Solar and Stellar Astrophysics
 Zusammenfassung: Context. The CARMENES survey is a high-precision radial velocity (RV) programme that aims to detect Earth-like planets orbiting low-mass stars.
Aims: 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.
Methods: 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.
Results: 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

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 Datum: 2018
 Publikationsstatus: Erschienen
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Titel: Astronomy and Astrophysics
Genre der Quelle: Zeitschrift
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Seiten: - Band / Heft: 609 Artikelnummer: - Start- / Endseite: - Identifikator: -