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- W3102645001 abstract "We present radiation hydrodynamic simulations in which binary planets form by close encounters in a system of several super-Earth embryos. The embryos are embedded in a protoplanetary disk consisting of gas and pebbles and evolve in a region where the disk structure supports convergent migration due to Type I torques. As the embryos accrete pebbles, they become heated and thus affected by the thermal torque (Ben'{i}tez-Llambay et al. 2015) and the hot-trail effect (Chrenko et al. 2017) which excites orbital eccentricities. Motivated by findings of Eklund & Masset (2017), we assume the hot-trail effect operates also vertically and reduces the efficiency of inclination damping. Non-zero inclinations allow the embryos to become closely packed and also vertically stirred within the convergence zone. Subsequently, close encounters of two embryos assisted by the disk gravity can form transient binary planets which quickly dissolve. Binary planets with a longer lifetime $sim$$10^{4}$ yr form in 3-body interactions of a transient pair with one of the remaining embryos. The separation of binary components generally decreases in subsequent encounters and due to pebble accretion until the binary merges, forming a giant planet core. We provide an order-of-magnitude estimate of the expected occurrence rate of binary planets, yielding one binary planet per $simeq$$2$--$5times10^{4}$ planetary systems. Therefore, although rare, the binary planets may exist in exoplanetary systems and they should be systematically searched for." @default.
- W3102645001 created "2020-11-23" @default.
- W3102645001 creator A5004357384 @default.
- W3102645001 creator A5019450930 @default.
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- W3102645001 date "2018-12-04" @default.
- W3102645001 modified "2023-09-25" @default.
- W3102645001 title "Binary Planet Formation by Gas-assisted Encounters of Planetary Embryos" @default.
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