Thermal torque effects on the migration of growing low-mass planets

GUILERA, O M; CUELLO, N; MONTESINOS, M; MILLER BERTOLAMI, M M; RONCO, M P; CUADRA, J; MASSET, F S

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2019 vol. 486 p. 5690 - 5708

0035-8711

As planets grow, the exchange of angular momentum with the gaseous component of theprotoplanetary disc produces a net torque resulting in a variation of the semimajor axis ofthe planet. For low-mass planets not able to open a gap in the gaseous disc, this regime isknown as type I migration. Pioneer works studied this mechanism in isothermal discs findingfast inward type I migration rates that were unable to reproduce the observed properties ofextrasolar planets. In the last years, several improvements have been made in order to extendthe study of type I migration rates to non-isothermal discs. Moreover, it was recently shownthat if the planet?s luminosity due to solid accretion is taken into account, inward migrationcould be slowed down and even reversed. In this work, we study the planet formation processincorporating, and comparing, updated type I migration rates for non-isothermal discs and therole of planet?s luminosity over such rates. We find that the latter can have important effectson planetary evolution, producing a significant outward migration for the growing planets.