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Hot Jupiters, cold kinematics: High phase space densities of host stars reflect an age bias by Mustill, Alexander J.; Lambrechts, Michiel; Davies, Melvyn B. is a scholarly article available to read on EtoBox.

What is Hot Jupiters, cold kinematics: High phase space densities of host stars reflect an age bias about?

Context. The birth environments of planetary systems are thought to influence planet formation and orbital evolution, through external photoevaporation and stellar flybys. Recent work has claimed observational support for this, in the form of a correlation between the properties of planetary systems and the local Galactic phase space density of the host star. In particular, Hot Jupiters are found overwhelmingly around stars in regions of high phase space density, which may reflect a formation environment with high stellar density. Aims. We instead investigate whether the high phase space density may have a galactic kinematic origin: Hot Jupiter hosts may be biased towards being young and therefore kinematically cold, because tidal inspiral leads to the destruction of the planets on Gyr timescales, and the velocity dispersion of stars in the Galaxy increases on similar timescales. Methods. We use 6D positions and kinematics from Gaia for the Hot Jupiter hosts and their neighbours, and construct distributions of the phase space density. We investigate correlations between the stars' local phase space density and peculiar velocity. Results. We find a strong anticorrelation between the

Author

Mustill, Alexander J.; Lambrechts, Michiel; Davies, Melvyn B.

Published

2021

Language

EN