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Baptiste Klein

@astroklein.bsky.social
60 followers 79 following 6 posts

Postdoc on Exoplanets and Stellar activity at Oxford

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Baptiste Klein @astroklein.bsky.social · 28/08/2025
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!
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Baptiste Klein @astroklein.bsky.social · 28/08/2025
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!
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Baptiste Klein @astroklein.bsky.social · 28/08/2025
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!
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Baptiste Klein @astroklein.bsky.social · 28/08/2025
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... 🔭🪐🧪
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