Baptiste Klein
@astroklein.bsky.social
Postdoc on Exoplanets and Stellar activity at Oxford
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!
Very excited to share that my new paper has been accepted for publication in MNRAS!
We are applying Doppler Imaging to model the activity signals from the HARPS-N Sun-as-a-star spectra! We show that injected planets can be retrieved with great accuracy!
ui.adsabs.harvard.edu/abs/2025MNRA... 🔭🪐🧪
We are applying Doppler Imaging to model the activity signals from the HARPS-N Sun-as-a-star spectra! We show that injected planets can be retrieved with great accuracy!
ui.adsabs.harvard.edu/abs/2025MNRA... 🔭🪐🧪
August 28, 2025 at 2:01 PM
Very excited to share that my new paper has been accepted for publication in MNRAS!
We are applying Doppler Imaging to model the activity signals from the HARPS-N Sun-as-a-star spectra! We show that injected planets can be retrieved with great accuracy!
ui.adsabs.harvard.edu/abs/2025MNRA... 🔭🪐🧪
We are applying Doppler Imaging to model the activity signals from the HARPS-N Sun-as-a-star spectra! We show that injected planets can be retrieved with great accuracy!
ui.adsabs.harvard.edu/abs/2025MNRA... 🔭🪐🧪