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Starspot-Induced Radial Velocity Jitter During a Stellar Cycle

Published online by Cambridge University Press:  29 April 2014

Heidi Korhonen ,
Jan Marie Andersen  and
Silva Järvinen
Heidi Korhonen
Affiliation:
Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark Centre for Star and Planet Formation, Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5-7, DK-1350, Copenhagen, Denmark
Jan Marie Andersen
Affiliation:
Centre for Star and Planet Formation, Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5-7, DK-1350, Copenhagen, Denmark Department of Astronomy, Boston University, 725 Commonwealth Avenue, Boston, MA 02215, USA
Silva Järvinen
Affiliation:
Leibniz-Institut für Astrophysik Potsdam (AIP), An Der Sternwarte 16, D-14482 Potsdam, Germany
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Abstract

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Late-type stars exhibit cool regions on their surface, the stellar equivalent of sunspots. These dark starspots can also mimic the radial velocity variations caused by orbiting planets, making it at times difficult to distinguish between planets and activity signatures. The amount of spots on the Sun and other cool stars changes cyclically during an activity cycle, which has length varying from about a year to longer than the solar 11 years. In this work we investigate the influence of varying amount of starspots on the sparsely sampled radial velocity observations - which are the norm in the radial velocity studies searching for exoplanets on wide orbits. We study two simulated cases: one with a random spot configuration, and one where the spot occurrence is concentrated. In addition we use Doppler images of young solar analogue V889 Her as a high activity case.

Keywords

stars: activityatmospheresplanetary systemsrotationspots
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S293: Formation, Detection, and Characterization of Extrasolar Habitable Planets , August 2012 , pp. 382 - 384
Copyright
Copyright © International Astronomical Union 2014 

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