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Pushing the limits of indirect exoplanet detection: Saturn analogues and beyond with Hipparcos-Gaia astrometry

Presentation #604.02 in the session Planet Detection - Other.

Published onApr 03, 2024
Pushing the limits of indirect exoplanet detection: Saturn analogues and beyond with Hipparcos-Gaia astrometry

Much of what is now known about long-period giant planets comes from long-term RV surveys. However, limits in both precision and time duration mean that these surveys have revealed relatively little about giant planets with periods beyond > 15 years, or planets less massive than Saturn beyond the ice line. Additionally, the “sin i” degeneracy leaves the true masses of these planets unknown. The recent development of Hipparcos-Gaia astrometry, with its 25-year baseline and unprecedentedly high astrometric precision, allows for new advances on existing detection limits for RV survey targets. I will present new results from my work with jointly modelling RVs and Hipparcos-Gaia astrometry, including a new giant planet with a Saturn-like P = 25 yr low eccentricity orbit, and the first confirmed sub-Saturn mass planets beyond the ice line of local Sun-like stars. These results push indirect detection limits towards longer periods and lower masses, expanding our understanding of giant planets at solar system scales and contributing to a complete picture of their origins.

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