Baptiste Klein
@astroklein.bsky.social
Postdoc on Exoplanets and Stellar activity at Oxford
Big thanks to HARPS-N solar team and science team, and to TNG staff for processing the data and maintaining the solar telescope!!
August 28, 2025 at 2:01 PM
Big thanks to HARPS-N solar team and science team, and to TNG staff for processing the data and maintaining the solar telescope!!
Could Doppler Imaging be a reliable alternative to radial-velocity-based activity modelling techniques? Maybe.. but we will have a develop an operational version of the code! Please contact me if you want to collaborate on this!
August 28, 2025 at 2:01 PM
Could Doppler Imaging be a reliable alternative to radial-velocity-based activity modelling techniques? Maybe.. but we will have a develop an operational version of the code! Please contact me if you want to collaborate on this!
We inject exoplanet signatures into the HARPS-N solar spectra, and use Doppler Imaging to retrieve these whilst modelling stellar activity. We show that, in the case of a super Earth on a 100-day orbit, the mass is retrieved with an accuracy at least as good as 2D Gaussian Processes!
August 28, 2025 at 2:01 PM
We inject exoplanet signatures into the HARPS-N solar spectra, and use Doppler Imaging to retrieve these whilst modelling stellar activity. We show that, in the case of a super Earth on a 100-day orbit, the mass is retrieved with an accuracy at least as good as 2D Gaussian Processes!
Our code pick up quite well the large structures of disc-resolved Dopplergrams of the Sun with SDO/HMI! Understanding what exact physical is picked up will need more work though!
August 28, 2025 at 2:01 PM
Our code pick up quite well the large structures of disc-resolved Dopplergrams of the Sun with SDO/HMI! Understanding what exact physical is picked up will need more work though!
In Doppler Imaging, we model the distortions of a star's spectral lines caused by magnetically-active regions at the stellar surface. We invert them into a full low-resolution map of the stellar surface brightness. We bypass the radial velocity computation!
August 28, 2025 at 2:01 PM
In Doppler Imaging, we model the distortions of a star's spectral lines caused by magnetically-active regions at the stellar surface. We invert them into a full low-resolution map of the stellar surface brightness. We bypass the radial velocity computation!