The mass-period distribution of close-in exoplanets (P. Benítez-Llambay et al.)

Vol. 528In section 10. Planets and planetary systems

The mass-period distribution of close-in exoplanets

by P. Benítez-Llambay, F. Masset, and C. Beaugé, A&A 528, A2 alt

It has been shown for some time that massive planets (1 Jupiter mass and more) may be found closer to their star (ie. with shorter orbital periods down to 1 day) than planets with lower masses that tend to have settled at safer distances (3 to 4 days). Benitez-Llambay et al. propose an explanation: this would be consistent protoplanetary disks having inner cavities with a corresponding Keplerian period of at least 2 days, and of a planet formation scenario in which massive planets migrate inward through the cavity until they reach the 2:1 resonance with its edge, whereas lower mass planets do not open a gap and remain trapped at the border of the cavity.