The diverse origin of exoplanets' eccentricities & inclinations

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Radial velocity surveys have discovered over 400 exoplanets. While measuring eccentricities of low-mass planets remains a challenge, giant exoplanets display a broad range of orbital eccentricities. Recently, spectroscopic measurements during transit have demonstrated that the short-period giant planets (hot-Jupiters) also display a broad range of orbital inclinations (relative to the rotation axis of the host star). Both properties pose a challenge for simple disk migration models and suggest that late-stage orbital evolution can play an important role in determining the final architecture of planetary systems. One possible formation mechanism for the inclined hot-Jupiters is some form of eccentricity excitation (e.g., planet scattering, secular perturbations due to a distant planet or wide binary) followed tidal circularization. The planet scattering hypothesis also makes predictions for the population of planets at large separations. Recent discoveries of planets on wide orbits via direct imaging and highly anticipated results from upcoming direct imaging campaigns are poised to provide a new type of constraint on planet formation. This proceedings describes recent progress in understanding the formation of giant exoplanets.

Original languageEnglish (US)
Title of host publicationThe Astrophysics of Planetary Systems
Subtitle of host publicationFormation, Structure, and Dynamical Evolution
EditorsAlessandro Sozzetti, Mario Lattanzi, Alan Boss
Pages221-224
Number of pages4
EditionS276
DOIs
StatePublished - Oct 1 2010

Publication series

NameProceedings of the International Astronomical Union
NumberS276
Volume6
ISSN (Print)1743-9213
ISSN (Electronic)1743-9221

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All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science

Cite this

Ford, E. B. (2010). The diverse origin of exoplanets' eccentricities & inclinations. In A. Sozzetti, M. Lattanzi, & A. Boss (Eds.), The Astrophysics of Planetary Systems: Formation, Structure, and Dynamical Evolution (S276 ed., pp. 221-224). (Proceedings of the International Astronomical Union; Vol. 6, No. S276). https://doi.org/10.1017/S1743921311020217