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SUMMARY:Breaking the activity barrier in exoplanet radial-velocity surveys
  through solar investigations at HARPS-N - Raphaëlle Haywood (CfA Harvard
 )
DTSTART:20170308T160000Z
DTEND:20170308T170000Z
UID:TALK69720@talks.cam.ac.uk
CONTACT:Ed Gillen
DESCRIPTION:Planet-hunter by night and Sun-chaser by day\, the HARPS-N spe
 ctrograph has been operating with a new solar telescope feed since 2015 Ju
 ly. I will report on the first year of observations and present my ongoing
  investigation towards understanding the physical origin of activity-induc
 ed RV variations.\nI use simultaneous\, high spatial resolution images fro
 m the Solar Dynamics Observatory to reconstruct the line profile shape res
 ulting from sunspots\, faculae and granulation. By comparing these reconst
 ructed line profiles with the cross-correlation functions obtained by HARP
 S-N\, I aim to identify a new proxy for faculae\, which are known to be th
 e main source of activity variations through suppression of convective blu
 eshift. 
LOCATION:Martin Ryle Seminar Room\, Kavli Institute
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