04133nam 22006615 450 991025462720332120200701154557.03-319-41273-610.1007/978-3-319-41273-3(CKB)3710000000754889(DE-He213)978-3-319-41273-3(MiAaPQ)EBC4602518(PPN)194513475(EXLCZ)99371000000075488920160718d2016 u| 0engurnn|008mamaatxtrdacontentcrdamediacrrdacarrierRadial-velocity Searches for Planets Around Active Stars[electronic resource] /by Raphaëlle D. Haywood1st ed. 2016.Cham :Springer International Publishing :Imprint: Springer,2016.1 online resource (XV, 140 p. 60 illus., 57 illus. in color.) Springer Theses, Recognizing Outstanding Ph.D. Research,2190-5053"Doctoral thesis accepted by the University of St. Andrews, UK."3-319-41272-8 Includes bibliographical references at the end of each chapters and index.Introduction: the Hunt for Extra-solar Planets -- A Toolkit to Detect Planets Around Active Stars -- Application to Observations of Planet-hosting Stars -- An Exploration into the Radial-velocity Variability of the Sun -- Conclusion.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. The findings of this thesis represent a significant step towards determining the masses of potentially habitable planets orbiting Sun-like stars. .Springer Theses, Recognizing Outstanding Ph.D. Research,2190-5053Observations, AstronomicalAstronomy—ObservationsAstrophysicsSpace sciencesAstrobiologyAstronomy, Observations and Techniqueshttps://scigraph.springernature.com/ontologies/product-market-codes/P22014Astrophysics and Astroparticleshttps://scigraph.springernature.com/ontologies/product-market-codes/P22022Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics)https://scigraph.springernature.com/ontologies/product-market-codes/P22030Astrobiologyhttps://scigraph.springernature.com/ontologies/product-market-codes/P22057Observations, Astronomical.Astronomy—Observations.Astrophysics.Space sciences.Astrobiology.Astronomy, Observations and Techniques.Astrophysics and Astroparticles.Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics).Astrobiology.629.4113Haywood Raphaëlle Dauthttp://id.loc.gov/vocabulary/relators/aut810055MiAaPQMiAaPQMiAaPQBOOK9910254627203321Radial-velocity Searches for Planets Around Active Stars1813420UNINA