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Paper: The Effects of Plage on Precision Radial Velocities
Volume: 294, Scientific Frontiers in Research on Extrasolar Planets
Page: 65
Authors: Saar, S. H.
Abstract: I present the first results of semi-empirical modeling of the effects of magnetic plage on measured radial velocities in G stars. I use solar line bisectors observed in quiet and active regions at a range of disk positions as proxies for stellar bisectors. These are then used to "warp" model line profiles and construct model stars with various V sin i and plage areas. The models predict the sun should show a maximum of 10 m/sec short-term RV fluctuations atop approx. 3 m/sec long-term (cyclic) modulation, while a Hyades age G dwarf with V sin i = 6 km/sec exhibits approx. 90 m/sec (short-term) atop approx. 14 m/sec (long-term).
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