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SUMMARY:Detection of planetary signals in cases of extreme stellar activit
 y - Oscar Barragán\, University of Oxford
DTSTART:20231031T130000Z
DTEND:20231031T140000Z
UID:TALK207733@talks.cam.ac.uk
CONTACT:Matthew Hooton
DESCRIPTION:Active regions on stellar surfaces induce signals in radial ve
 locity (RV) time series that limit our ability to detect planetary signals
 . In order to detect planetary-induced RV signals\, we need to perform inf
 ormed modelling of the stellar activity. The use of spectroscopic activity
  indicators is useful to understand the behaviour of stellar signals in RV
  data. However\, the stellar activity manifests with different behaviour a
 nd shapes in different spectroscopic time series. Therefore\, the use of a
 ctivity indicators to inform the modelling of the stellar signal in the RV
  data has to be taken carefully. In this talk\, I discuss how a multidimen
 sional Gaussian Processes framework can be used to constrain the stellar s
 ignal in multiple spectroscopic time series. This approach takes into acco
 unt the different shapes in which stellar activity appears in the spectros
 copic time series. I will show some practical examples of how this approac
 h has been used to detect planet signals tens of times smaller than the st
 ellar signal for young active stars.
LOCATION:Ryle seminar room + ONLINE - Details to be sent by email
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