Published October 4, 2021 | Version v1
Presentation Restricted

Nonzero eccentricities of warm Neptunes

  • 1. University of Coimbra
  • 2. Geneva Observatory


Close-in planets (with orbital periods less than a few days) undergo strong tidal dissipation that should circularise their orbits in a timescale shorter than the age of the system. However, most Neptune-mass planets in this kind of orbits present nonzero eccentricity, typically around 0.15. In this talk we discuss some mechanisms that can oppose to gravitational tides, namely, thermal atmospheric tides, evaporation of the atmosphere, and excitation from a distant companion. We show the limitations of these different mechanisms and how some of them could, depending on specific properties of the observed planetary systems, account for the nonzero eccentricities presently observed.



The record is publicly accessible, but files are restricted to users with access.

Request access

If you would like to request access to these files, please fill out the form below.

You need to satisfy these conditions in order for this request to be accepted:

The access is limited to participants in the Plato Mission Conference 2021

You are currently not logged in. Do you have an account? Log in here