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# How the planetary eccentricity influences the pebble isolation mass

Abstract : We investigate the pebble isolation mass (PIM) for a planet on a fixed eccentric orbit in its protoplanetary disc by conducting a set of two-dimensional (2D) hydrodynamical simulations, including dust turbulent diffusion. A range of planet eccentricities up to e = 0.2 is adopted. Our simulations also cover a range of α-turbulent viscosities, and for each pair {α, e} the PIM is estimated as the minimum planet mass in our simulations such that solids with a Stokes number ≳0.05 do not flow across the planet orbit and remain trapped around a pressure bump outside the planet gap. For α < 10-3, we find that eccentric planets reach a well-defined PIM, which can be smaller than for planets on circular orbits when the eccentricity remains smaller than the disc's aspect ratio. We provide a fitting formula for how the PIM depends on the planet's eccentricity. However, for α > 10-3, eccentric planets cannot fully stall the pebbles flow and, thus, do not reach a well-defined PIM. Our results suggest that the maximum mass reached by rocky cores should exhibit a dichotomy depending on the disc's turbulent viscosity. While being limited to ${\cal O}(10\, M_\oplus)$ in low-viscosity discs, this maximum mass could reach much larger values in discs with a high turbulent viscosity in the planet vicinity. Our results further highlight that pebble filtering by growing planets might not be as effective as previously thought, especially in high-viscosity discs, with important implications to protoplanetary discs observations.
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Journal articles

https://hal-insu.archives-ouvertes.fr/insu-03656915
Contributor : Nathalie Pothier Connect in order to contact the contributor
Submitted on : Monday, May 2, 2022 - 2:53:43 PM
Last modification on : Monday, May 16, 2022 - 8:20:25 AM

### Citation

Raúl O. Chametla, Frédéric S. Masset, Clément Baruteau, Bertram Bitsch. How the planetary eccentricity influences the pebble isolation mass. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2022, 510, pp.3867-3875. ⟨10.1093/mnras/stab3753⟩. ⟨insu-03656915⟩

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