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Modeling the RV and BVS of active stars

Published online by Cambridge University Press:  19 April 2010

K. Goździewski ,
A. Niedzielski ,
J. Schneider ,
C. Migaszewski  and
G. Nowak
C. Migaszewski*
Affiliation:
Toruń Centre for Astronomy, Nicolaus Copernicus University, Gagarin Str. 11, 87-100 Toruń, Poland
G. Nowak
Affiliation:
Toruń Centre for Astronomy, Nicolaus Copernicus University, Gagarin Str. 11, 87-100 Toruń, Poland
*
c.migaszewski@astri.umk.pl ; g.nowak@astri.umk.pl
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Abstract

We present a method for the analysis of radial velocity (RV) measurements, in the context of searching for planets around chromospherically active stars. We assume that the observed RV signal is induced by the reflex motion of the star as well as by distortions of spectral line profiles, measured by the Bisector Velocity Span (BVS). The RVs are fitted with a Keplerian planetary model complemented by a correction term that is linearly dependent on the BVS. The BVS represents the stellar activity contribution to the observed RV. The coefficient of this linear dependence is an additional free parameter of the model. This approach differs from methods in the literature, which make usage of the BVS measurements before or after fitting the planetary model. We test the method on a simulated data set of a 1-planet configuration. The results are compared with the outcomes of algorithms found in the literature.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 42: Extrasolar Planets in Multi-Body Systems: Theory and Observations , 2010 , pp. 153 - 159
Copyright
© EAS, EDP Sciences, 2010

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