SCATTERING OUTCOMES OF CLOSE-IN PLANETS: CONSTRAINTS ON PLANET MIGRATION
SCATTERING OUTCOMES OF CLOSE-IN PLANETS: CONSTRAINTS ON PLANET MIGRATION
复制标题
近地行星的散射结果:对行星迁移的限制
DOI:
10.1088/0004-637x/786/2/101
复制
发表时间:
2014
期刊:
影响因子:
--
通讯作者:
R. Rafikov
中科院分区:
文献类型:
--
作者:
C. Petrovich;S. Tremaine;R. Rafikov
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 starting with low eccentricities and mutual inclinations (e ≲ 0.1, i ≲ 0.1) 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.
DOI:
10.1146/annurev-astro-081811-125523
发表时间:
2012-03
影响因子:
33.3
作者:
W. Kley;R. Nelson
通讯作者:
W. Kley;R. Nelson
影响因子:
4.8
作者:
Dunhill A
通讯作者:
Dunhill A