Breaking the activity barrier in exoplanet radial-velocity surveys through solar investigations at HARPS-N

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• Raphaëlle Haywood (CfA Harvard)
• Wednesday 08 March 2017, 16:00-17:00
• Martin Ryle Seminar Room, Kavli Institute.

If you have a question about this talk, please contact Ed Gillen.

Planet-hunter by night and Sun-chaser by day, the HARPS -N spectrograph has been operating with a new solar telescope feed since 2015 July. I will report on the first year of observations and present my ongoing investigation towards understanding the physical origin of activity-induced RV variations. I use simultaneous, high spatial resolution images from the Solar Dynamics Observatory to reconstruct the line profile shape resulting from sunspots, faculae and granulation. By comparing these reconstructed line profiles with the cross-correlation functions obtained by HARPS -N, I aim to identify a new proxy for faculae, which are known to be the main source of activity variations through suppression of convective blueshift.

This talk is part of the Exoplanet Seminars series.

This talk is included in these lists:

• Cambridge Astronomy Talks
• Combined External Astrophysics Talks DAMTP
• Cosmology, Astrophysics and General Relativity
• Exoplanet Seminars
• Institute of Astronomy Talk Lists
• LCLU Departmental Talks
• Martin Ryle Seminar Room, Kavli Institute

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