Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21741507n&link_type=abstract
American Astronomical Society, AAS Meeting #217, #415.07; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The search for extra-solar planets has led to the surprising discovery of many Jupiter-like planets in very close proximity to their host star (the so called hot Jupiters). Many have been observed to be on orbits inclined with respect to the equator of the star, some even in retrograde orbits. This poses a unique challenge to many planet formation scenarios. Here we show that the presence of an additional, moderately inclined and eccentric massive planet companion in a planetary system can naturally explain close, inclined and eccentric orbits. The flow of angular momentum from the hot Jupiter's orbit to the orbit of the perturber can lead to both high eccentricities and inclinations, and even completely flip the hot Jupiter's orbit. For the first time we provide a complete treatment of the octupole-order secular dynamics, while also including tidal friction. In this treatment a brief excursion to very high eccentricity during the chaotic evolution of the hot Jupiter's orbit can lead to rapid tidal capture; in some instances the orientation can flip before the capture.
Farr Warrick
Lithwick Yoram
Naoz Smadar
Rasio Fred
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