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Celest Mech Dyn Astr (2013) 117:5974
DOI 10.1007/s10569-013-9502-y
ORIGINAL ARTICLE
Tidal evolution of close-in exoplanets in co-orbital congurations
Adrin Rodrguez Cristian A. Giuppone
Tatiana A. Michtchenko
Received: 13 March 2013 / Revised: 20 May 2013 / Accepted: 18 June 2013 / Published online: 23 July 2013 Springer Science+Business Media Dordrecht 2013
Abstract In this paper, we study the behavior of a pair of co-orbital planets, both orbiting a central star on the same plane and undergoing tidal interactions. Our goal is to investigate nal orbital congurations of the planets, initially involved in the 1/1 mean-motion resonance (MMR), after long-lasting tidal evolution. The study is done in the form of purely numerical simulations of the exact equations of motions accounting for gravitational and tidal forces. The results obtained show that, at least for equal mass planets, the combined effects of the resonant and tidal interactions provoke the orbital instability of the system, often resulting in collision between the planets. We rst discuss the case of two hot-super-Earth planets, whose orbital dynamics can be easily understood in the frame of our semi-analytical model of the 1/1 MMR. Systems consisting of two hot-Saturn planets are also briey discussed.
Keywords Hot Saturns Hot super Earths Two-planet systems Planetary systems
disruption Tides Exo-Trojans
1 Introduction
In contrast with strong mean-motion resonances (MMRs), such as 2/1 and 3/2 MMR (see Beaug et al. 2012) there are no known pairs in co-orbital conguration, despite the continuously increasing number of discovered exoplanets. This intriguing fact can be investigated in the context of a past large-scale planetary migration and capture due to, for instance, interactions with the gaseous protoplanetary disk. Several theories about the formation, dissipative evolution and possible detection of exo-Trojans have been developed and will be discussed later in this section.
A. Rodrguez (B) T. A. Michtchenko
Instituto de Astronomia, Geofsica e Cincias Atmosfricas, IAGUSP, Universidade de So Paulo, So Paulo, SP, Brazile-mail: [email protected]
C.A. GiupponeObservatorio Astronmico, Universidad Nacional de Crdoba, IATE, Crdoba, Argentina
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The rst detailed analysis of hypothetical co-orbital exoplanets was done in Laughlin and Chambers (2002), focusing the difculties in tting of the RV data of these systems. More recently, Hadjidemetriou et al. (2009) studied the topology of the phase space and the...