Many exoplanets in close-in orbits are observed to have relatively high
eccentricities and large stellar obliquities. We explore the possibility that
these result from planet-planet scattering by studying the dynamical outcomes
from a large number of orbit integrations in systems with two and three
gas-giant planets in close-in orbits (0.05 AU < a < 0.15 AU). We find that at
these orbital separations, unstable systems generally lead to planet-planet
collisions in which the collision product is a planet on a low-eccentricity,
low-inclination orbit. This result is inconsistent with the observations. We
conclude that eccentricity and inclination excitation from planet-planet
scattering must precede migration of planets into short-period orbits. This
result constrains theories of planet migration: the semi-major axis must shrink
by 1-2 orders of magnitude without damping the eccentricity and inclination.
Description
[1401.4457] Scattering outcomes of close-in planets: constraints on planet migration
%0 Generic
%1 petrovich2014scattering
%A Petrovich, Cristobal
%A Tremaine, Scott
%A Rafikov, Roman R.
%D 2014
%K 2014 a:Petrovich a:Tremaine dynamics planets
%T Scattering outcomes of close-in planets: constraints on planet migration
%U http://arxiv.org/abs/1401.4457
%X Many exoplanets in close-in orbits are observed to have relatively high
eccentricities and large stellar obliquities. We explore the possibility that
these result from planet-planet scattering by studying the dynamical outcomes
from a large number of orbit integrations in systems with two and three
gas-giant planets in close-in orbits (0.05 AU < a < 0.15 AU). We find that at
these orbital separations, unstable systems generally lead to planet-planet
collisions in which the collision product is a planet on a low-eccentricity,
low-inclination orbit. This result is inconsistent with the observations. We
conclude that eccentricity and inclination excitation from planet-planet
scattering must precede migration of planets into short-period orbits. This
result constrains theories of planet migration: the semi-major axis must shrink
by 1-2 orders of magnitude without damping the eccentricity and inclination.
@misc{petrovich2014scattering,
abstract = {Many exoplanets in close-in orbits are observed to have relatively high
eccentricities and large stellar obliquities. We explore the possibility that
these result from planet-planet scattering by studying the dynamical outcomes
from a large number of orbit integrations in systems with two and three
gas-giant planets in close-in orbits (0.05 AU < a < 0.15 AU). We find that at
these orbital separations, unstable systems generally lead to planet-planet
collisions in which the collision product is a planet on a low-eccentricity,
low-inclination orbit. This result is inconsistent with the observations. We
conclude that eccentricity and inclination excitation from planet-planet
scattering must precede migration of planets into short-period orbits. This
result constrains theories of planet migration: the semi-major axis must shrink
by 1-2 orders of magnitude without damping the eccentricity and inclination.},
added-at = {2014-02-03T12:57:53.000+0100},
author = {Petrovich, Cristobal and Tremaine, Scott and Rafikov, Roman R.},
biburl = {https://www.bibsonomy.org/bibtex/2b2bb628d16801e79594b1bf72ce9a55a/danielcarrera},
description = {[1401.4457] Scattering outcomes of close-in planets: constraints on planet migration},
interhash = {32cbeab5988e37adf99b5cd78ec08d0d},
intrahash = {b2bb628d16801e79594b1bf72ce9a55a},
keywords = {2014 a:Petrovich a:Tremaine dynamics planets},
note = {cite arxiv:1401.4457Comment: 10 pages, 3 figures, submitted to ApJ},
timestamp = {2014-02-03T12:57:53.000+0100},
title = {Scattering outcomes of close-in planets: constraints on planet migration},
url = {http://arxiv.org/abs/1401.4457},
year = 2014
}