Stellar noise and planet detection. II. Radial-velocity noise induced by magnetic cycles
X. Dumusque, C. Lovis, S. Udry, N. C. Santos
TL;DR
This study investigates how magnetic cycles induce radial-velocity noise in stars, revealing a correlation with activity indices and effective temperature, enabling improved correction methods for planet detection.
Contribution
It introduces a new correction method for magnetic cycle-induced RV noise based on activity indices and stellar temperature for dwarf stars.
Findings
Strong correlation between RV-activity index slope and Teff.
Magnetic cycle effects can be corrected using activity index and Teff.
Enhanced precision in RV measurements for planet detection.
Abstract
For the 451 stars of the HARPS high precision program, we study correlations between the radial-velocity (RV) variation and other parameters of the Cross Correlated Function (CCF). After a careful target selection, we found a very good correlation between the slope of the RV-activity index (log(R'HK) correlation and the Teff for dwarf stars. This correlation allow us to correct RV from magnetic cycles given the activity index and the Teff.
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