%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 }