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Unraveling Planet Formation and Dynamics across the Vast Galactic Landscape

Presentation #403.01 in the session Exoplanets Formation & Evolution (Oral Presentation)

Published onOct 23, 2023
Unraveling Planet Formation and Dynamics across the Vast Galactic Landscape

The current planet population is the outcome of natal disk composition and a history of dynamic interactions. Since stars are not born in isolation, but rather part of an ever-changing galaxy, their location may provide a fossil record of planet formation throughout the history of the Milky Way, unveiling long-term formation processes and pathways not seen in younger planet populations. Leveraging Gaia proper motion and radial velocity measurements alongside Kepler and K2 transiting exoplanet surveys, we uncover a galactic trend, whereby stars with large vertical excursions from the Milky Way plane host fewer super-Earths and sub-Neptunes. While metallicity is associated with oscillation amplitude and small planet occurrence, it alone cannot account for the observed trend, underscoring the imprint of galactic influences on the planet population. Currently, the origin of this phenomena remains unclear, but I will discuss potential mechanisms for this occurrence deficit and how future missions and instruments can help unveil the role our galaxy plays in the formation and evolution of planetary systems.

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