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SUMMARY:The Evolution of Stellar Radial Velocity Jitter: Toward an Astroph
 ysically-Motivated Predictor of Stellar RV Jitter - Jacob Luhn (Penn State
 )
DTSTART:20201117T130000Z
DTEND:20201117T140000Z
UID:TALK151888@talks.cam.ac.uk
CONTACT:Dr Annelies Mortier
DESCRIPTION:With current and upcoming radial velocity (RV) spectrographs c
 apable of extreme precision (30 cm/s and below)\, the next hurdle for meas
 uring precise masses of Earth-mass exoplanets is intrinsic stellar variabi
 lity\, or “jitter”\, which can imprint RV signals at the m/s level. It
  is therefore crucial that we better understand the effects of stellar RV 
 jitter in order to select and prioritize targets best suited for RV observ
 ations. To that end\, I will present the results of an in-depth analysis o
 f stellar RV jitter for more than 600 California Planet search stars with 
 as many as 20 years of observations\, providing an astrophysical framework
  to describe the evolution of RV jitter and the resulting “jitter minimu
 m” – the period during which a star is most amenable to RV observation
 s. Using that framework\, I will highlight various models to predict the R
 V jitter of stars from a priori based on their stellar properties. In part
 icular\, I will show the results of a hierarchical Bayesian model that fit
 s individual astrophysical sources of RV jitter: activity\, granulation\, 
 and oscillations\, making it capable of estimating not only the overall am
 plitude of stellar RV jitter for a given star\, but also each astrophysica
 l component\, which will allow for informed observing strategies for RV fo
 llow-up in order to mitigate individual sources of stellar RV variability.
LOCATION:ONLINE - Details to be sent by email
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