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        The impact of unresolved magnetic spots on high precision radial velocity measurements

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        2007.12193v1.pdf (PDF, 3Mb)
        Author
        Lisogorskyi, Maksym
        Saikia, Susdeshna Boro
        Jeffers, Sandra V.
        Jones, Hugh R. A.
        Morin, Julien
        Mengel, Matthew
        Reiners, Ansgar
        Vidotto, Aline A.
        Petit, Pascal
        Attention
        2299/23040
        Abstract
        The Doppler method of exoplanet detection has been extremely successful, but suffers from contaminating noise from stellar activity. In this work a model of a rotating star with a magnetic field based on the geometry of the K2 star Epsilon Eridani is presented and used to estimate its effect on simulated radial velocity measurements. A number of different distributions of unresolved magnetic spots were simulated on top of the observed large-scale magnetic maps obtained from eight years of spectropolarimetric observations. The radial velocity signals due to the magnetic spots have amplitudes of up to 10 m s$^{-1}$, high enough to prevent the detection of planets under 20 Earth masses in temperate zones of solar type stars. We show that the radial velocity depends heavily on spot distribution. Our results emphasize that understanding stellar magnetic activity and spot distribution is crucial for detection of Earth analogues.
        Publication date
        2020-07-23
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1093/mnras/staa2184
        Other links
        http://hdl.handle.net/2299/23040
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