http://arxiv.org/abs/1704.06383
We investigate the origin of the period distribution of giant planets. We try to fit the bias-corrected distribution of giant planets inside 300 days found by Santerne et al. (2016) using a planet formation model based on pebble accretion. We investigate two possible initial conditions: a linear distribution of planetary seeds, and seeds injected exclusively on the water and CO icelines. Our simulations exclude the linear initial distribution of seeds with a high degree of confidence. Our bimodal model based on snowlines give a more reasonable fit to the data, with the discrepancies reducing sig- nificantly if we assume the water snowline to be a factor 3-10 less efficient at producing planetary seeds. This model moreover performs better on both the warm/hot Jupiters ratio and the Gaussian mixture model as comparison criteria. Our results hint that the giant exoplanets population inside 300 days is more compatible with planets forming preferentially at special locations.
M. Ali-Dib, A. Johansen and C. Huang
Mon, 24 Apr 17
25/54
Comments: 8 pages, 6 figures, submitted to MNRAS (revised version after the referee’s first report)