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  • Open Daily: 10am - 10pm
    Alley-side Pickup: 10am - 7pm

    3038 Hennepin Ave Minneapolis, MN
    612-822-4611

Open Daily: 10am - 10pm | Alley-side Pickup: 10am - 7pm
3038 Hennepin Ave Minneapolis, MN
612-822-4611
Radial-Velocity Searches for Planets Around Active Stars

Radial-Velocity Searches for Planets Around Active Stars

Haywood, Raphaëlle D.

Hardcover

Series: Springer Theses

Astronomy & SpaceGeneral SciencePhysics

ISBN10: 3319412728
ISBN13: 9783319412726
Publisher: Springer
Published: Jul 28 2016
Pages: 140
Weight: 0.88
Height: 0.44 Width: 6.14 Depth: 9.21
Language: English
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.

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