Hints for a Turnover at the Snow Line in the Giant Planet Occurrence Rate

Fernandes, Rachel B.; Mulders, Gijs D.; Pascucci, Ilaria; Mordasini, Christoph; Emsenhuber, Alexandre (2019). Hints for a Turnover at the Snow Line in the Giant Planet Occurrence Rate. Astrophysical journal, 874(1), p. 81. Institute of Physics Publishing IOP 10.3847/1538-4357/ab0300

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The orbital distribution of giant planets is crucial for understanding how terrestrial planets form and predicting yields of exoplanet surveys. Here, we derive giant planets occurrence rates as a function of orbital period by taking into account the detection efficiency of the Kepler and radial velocity (RV) surveys. The giant planet occurrence rates for Kepler and RV show the same rising trend with increasing distance from the star. We identify a break in the RV giant planet distribution between ~2-3 au -- close to the location of the snow line in the Solar System -- after which the occurrence rate decreases with distance from the star. Extrapolating a broken power-law distribution to larger semi-major axes, we find good agreement with the ~ 1% planet occurrence rates from direct imaging surveys. Assuming a symmetric power law, we also estimate that the occurrence of giant planets between 0.1-100 au is 26.6 +7.5 -5.4% for planets with masses 0.1-20MJ and decreases to 6.2 +1.5 -1.2% for planets more massive than Jupiter. This implies that only a fraction of the structures detected in disks around young stars can be attributed to giant planets. Various planet population synthesis models show good agreement with the observed distribution, and we show how a quantitative comparison between model and data can be used to constrain planet formation and migration mechanisms.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences > Theoretical Astrophysics and Planetary Science (TAPS)
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute
08 Faculty of Science > Physics Institute > NCCR PlanetS

UniBE Contributor:

Mordasini, Christoph and Emsenhuber, Alexandre

Subjects:

500 Science
500 Science > 520 Astronomy
500 Science > 530 Physics
600 Technology > 620 Engineering

ISSN:

0004-637X

Publisher:

Institute of Physics Publishing IOP

Language:

English

Submitter:

Janine Jungo

Date Deposited:

21 Apr 2020 14:06

Last Modified:

26 Apr 2020 02:47

Publisher DOI:

10.3847/1538-4357/ab0300

BORIS DOI:

10.7892/boris.143000

URI:

https://boris.unibe.ch/id/eprint/143000

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