Leseprobe
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Radial-velocity Searches for Planets Around Active Stars
Raphaëlle D. Haywood
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Springer International Publishing 
Naturwissenschaften, Medizin, Informatik, Technik / Astronomie
Beschreibung
This thesis develops new and powerful methods for identifying planetary signals in the presence of “noise” generated by stellar activity, and explores the physical origin of stellar intrinsic variability, using unique observations of the Sun seen as a star. In particular, it establishes that the intrinsic stellar radial-velocity variations mainly arise from suppression of photospheric convection by magnetic fields. With the advent of powerful telescopes and instruments we are now on the verge of discovering real Earth twins in orbit around other stars. The intrinsic variability of the host stars themselves, however, currently remains the main obstacle to determining the masses of such small planets. The methods developed here combine Gaussian-process regression for modeling the correlated signals arising from evolving active regions on a rotating star, and Bayesian model selection methods for distinguishing genuine planetary signals from false positives produced by stellar magnetic activity.
Kundenbewertungen
Starspots, Sun-like Stars, Stellar Activity, Search for Other Earths, Exoplanet (extra-solar planet) Detection, Low-mass Exoplanets, Radial-velocity Searches, Stellar Radial-velocity Variability, Exoplanet Mass Determination, Exoplanet Characterisation