Terrestrial Planets Formation around Circumbinary Habitable Zone: Inward Migration in the Planetesimal Swarm

Abstract

According to the core accretion theory, circumbinary embryos can form only beyond a critical semimajor axis (CSMA). However, due to the relatively high density of solid materials in the inner disk, significant amount of small planetesimals must exist in the inner zone when embryos were forming outside this CSMA. So embryos migration induced by the planetesimal swarm is possible after the gas disk depletion. Through numerical simulations, we found (i) the scattering-driven inward migration of embryos is robust, planets can form in the habitable zone if we adopt a mass distribution of MMSN-like disk; (ii) the total mass of the planetesimals in the inner region and continuous embryo-embryo scattering are two key factors that cause significant embryo migrations; (iii) the scattering-driven migration of embryos is a natural water-deliver mechanism. We propose that planet detections should focus on the close binary with its habitable zone near CSMA.

Accepted for publication at ApJL

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Cited by in corpus (8)

• On the dynamical stability of the proposed planetary system orbiting NSVS 14256825
• The Search for Extraterrestrial Intelligence in Earth's Solar Transit Zone
• Circumbinary Planet Formation in the Kepler-16 System. II. A Toy Model for In-situ Planet Formation within a Debris Belt
• Placing Limits On The Transit Timing Variations Of Circumbinary Exoplanets
• Terrestrial planet formation in a circumbinary disc around a coplanar binary
• Where to Find Habitable "Earths" in Circumbinary Systems
• Tatooine Nurseries: Structure and Evolution of Circumbinary Protoplanetary Disks
• Transits of Planets with Small Intervals in Circumbinary Systems