The origin of the occurrence rate profile of gas giants inside 100 d

Summary, in English

We investigate the origin of the period distribution of giant planets. We fit the bias-corrected distribution of gas-giant planets inside 300 d found by Santerne et al. 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 gives a more reasonable fit to the data, with the discrepancies reducing significantly if we assume the water snowline to be a factor of 3-10 less efficient at producing planets. This model moreover performs better on both the warm/hot Jupiters ratio and a Gaussian mixture model as comparison criteria. Our results hint that the gas-giant exoplanets population inside 300 d is more compatible with planets forming preferentially at special locations.

• Author: Mohamad Ali-Dib; Anders Johansen; Chelsea X. Huang
• Department/s: Lund Observatory - Has been reorganised; eSSENCE: The e-Science Collaboration
• Publishing year: 2017-01-01
• Language: English
• Pages: 5016-5022
• Publication/Series: Monthly Notices of the Royal Astronomical Society
• Volume: 469
• Issue: 4
• Links: http://dx.doi.org/10.1093/mnras/stx1272
• Document type: Journal article
• Publisher: Oxford University Press
• Topic: Astronomy, Astrophysics and Cosmology
• Keywords: Planets and satellites: formation
• Status: Published
• ISBN/ISSN/Other: ISSN: 0035-8711