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Protostellar Disks, Planet Traps, and the Origins...
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Protostellar Disks, Planet Traps, and the Origins of Exoplanetary Systems

Abstract

Abstract The mass-semimajor axis diagram for exoplanets is populated by at least three distinct planetary populations: hot Jupiters at small orbital radii, more massive Jovian planets gathered at about 1 AU, and a rapidly growing population of SuperEarths at short periods. Our work shows that low mass and rapidly migrating planetary cores get trapped at disk inhomogeneities, where strong density or thermal gradients exist (namely dead zone boundaries, ice lines, and disk heating transition regions). Planet growth and movement occur at rates dictated by planetary accretion, and the slow radial inward motion of the traps due to falling disk accretion rates during disk evolution. By combining the theory of traps in evolving disks with standard ideas about how protoplanets accrete, we develop evolutionary tracks of how planets evolve in the mass- semimajor axis diagram. Our models account for the planetary “pile-up” at 1AU, the origin of SuperEarths and hot Jupiters, and the relative scarcity of Jovian planets at large distances.

Authors

Pudritz RE; Hasegawa Y

Volume

8

Pagination

pp. 365-369

Publisher

Cambridge University Press (CUP)

Publication Date

January 1, 2013

DOI

10.1017/s174392131300896x

Conference proceedings

Proceedings of the International Astronomical Union

Issue

S299

ISSN

1743-9213

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