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SUMMARY:On Activity and Planets of Low-Mass Stars: Towards the Tenth Anniv
 ersary of CARMENES - Lev Tal-Or (Ariel)
DTSTART:20250520T120000Z
DTEND:20250520T130000Z
UID:TALK227284@talks.cam.ac.uk
CONTACT:Dr Dolev Bashi
DESCRIPTION:It has been almost ten years since CARMENES opened its two spe
 ctroscopic eyes at the Calar-Alto observatory. Here’s an up-to-date acco
 unt of the findings: more than 40 new planets in a sample of 354 M dwarfs\
 ; mass estimates of 32 transiting planets\; and more than 120 papers\, als
 o covering topics such as stellar magnetic activity\, binaries\, and atmos
 pheric characterization of exoplanets. So\, what’s next? Stellar activit
 y is still the main factor limiting the detection of many more planets or 
 estimating the mass of transiting planets around low-mass stars. But for C
 ARMENES\, stellar activity is a signal\, not just correlated noise. In its
  spectroscopic time series\, it is manifested as a quasiperiodic wavelengt
 h-dependent variability\, which induces activity-related radial velocity (
 ARV) variations of at least 2 m/s. For many stars\, ARV variability is >1
 0 m/s. Fortunately\, ARV variability differs from Doppler shifts: it is u
 sually incoherent\, wavelength-dependent\, and accompanied by spectral sha
 pe variations. These differences can help us distinguish between activity-
 related and planetary signals and model both phenomena simultaneously.
LOCATION:Ryle seminar room + ONLINE - Details to be sent by email
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