We investigate the formation of multiple-planet systems in the presence of a hot Jupiter using extended N-body simulations that are performed simultaneously with semi-analytic calculations.
Our primary aims are to describe the planet formation process starting from planetesimals using high-resolution simulations, and to examine the dependences of the architecture of planetary systems on input parameters (e.g., disk mass, disk viscosity). We observe that protoplanets that arise from oligarchic growth and undergo type I migration stop migrating when they join a chain of resonant planets outside the orbit of a hot Jupiter. The formation of a resonant chain is almost independent of our model parameters, and is thus a robust process. At the end of our simulations, several terrestrial planets remain at around 0.1 AU. The formed planets are not equal-mass; the largest planet constitutes more than 50 percent of the total mass in the close-in region, which is also less dependent on parameters.
In the previous work of this paper (Ogihara et al. 2013), we have found a new physical mechanism of induced migration of the hot Jupiter, which is called a crowding-out. If the hot Jupiter opens up a wide gap in the disk (e.g., owing to low disk viscosity), crowding-out becomes less efficient and the hot Jupiter remains. We also discuss angular momentum transfer between the planets and disk.
Masahiro Ogihara, Hiroshi Kobayashi, Shu-ichiro Inutsuka (Submitted on 19 Apr 2014)
Comments: 15 pages, 9 figures, 2 tables, accepted for publication in ApJ
Subjects: Earth and Planetary Astrophysics (astro-ph.EP)
Cite as: arXiv:1404.4990 [astro-ph.EP] (or arXiv:1404.4990v1 [astro-ph.EP] for this version)
Submission history From: Masahiro Ogihara [v1] Sat, 19 Apr 2014 21:48:35 GMT (4758kb)
Please follow Astrobiology on Twitter.