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Title: Spin dynamics of close-in planets exhibiting large transit timing variations
Author: Delisle, J.-B.
Correia, A. C. M.
Leleu, A.
Robutel, P.
Keywords: Celestial mechanics
Planets and satellites: general
Issue Date: Sep-2017
Publisher: EDP Sciences
Abstract: We study the spin evolution of close-in planets in compact multi-planetary systems. The rotation period of these planets is often assumed to be synchronous with the orbital period due to tidal dissipation. Here we show that planet-planet perturbations can drive the spin of these planets into non-synchronous or even chaotic states. In particular, we show that the transit timing variation (TTV) is a very good probe to study the spin dynamics, since both are dominated by the perturbations of the mean longitude of the planet. We apply our model to KOI-227 b and Kepler-88 b, which are both observed undergoing strong TTVs. We also perform numerical simulations of the spin evolution of these two planets. We show that for KOI-227 b non-synchronous rotation is possible, while for Kepler-88 b the rotation can be chaotic. © ESO, 2017.
Peer review: yes
DOI: 10.1051/0004-6361/201730755
ISSN: 0004-6361
Appears in Collections:CIDMA - Artigos
DFis - Artigos
GGDG - Artigos

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