2022A&A...666A..53Z


Query : 2022A&A...666A..53Z

2022A&A...666A..53Z - Astronomy and Astrophysics, volume 666A, 53 (2022/10-1)

Orbital evolution of circumbinary planets due to creep tides.

ZOPPETTI F.A., FOLONIER H., LEIVA A.M. and GOMES G.O.

Abstract (from CDS):

Most confirmed circumbinary planets are located very close to their host binary where the tidal forces are expected to play an important role in their dynamics. Here we consider the orbital evolution of a circumbinary planet with arbitrary viscosity, subjected to tides due to both central stars. We adopt the creep tide theory and assume that the planet is the only extended body in the system and that its orbital evolution occurs after acquiring its pseudo-synchronous stationary rotational state. With this aim, we first performed a set of numerical integrations of the tidal equations, using a Kepler-38-type system as a working example. For this case we find that the amount of planetary tidal migration and also, curiously, its direction both depend on the viscosity. However, the effect of tides on its eccentricity and pericenter evolutions is simply a move toward pure gravitational secular solutions. Then we present a secular analytical model for the planetary semimajor axis and eccentricity evolution that reproduces very well the mean behavior of the full tidal equations and provides a simple criterion to determine the migration directions of the circumbinary planets. This criterion predicts that some of the confirmed circumbinary planets are tidally migrating inward, but others are migrating outward. However, the typical timescales are predicted to be very long, and not much orbital tidal evolution is expected to have taken place in these systems. Finally, we revisit the orbital evolution of a circumbinary planet in the framework of the constant time lag model. We find that the results predicted with this formalism are identical to those obtained with creep theory in the limit of gaseous bodies.

Abstract Copyright: © F. A. Zoppetti et al. 2022

Journal keyword(s): planet-star interactions - planets and satellites: dynamical evolution and stability - celestial mechanics

Simbad objects: 13

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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 TOI-1338 EB* 06 08 31.9675204416 -59 32 28.081703112   12.537 11.975     ~ 40 0
2 Kepler-453 EB* 18 52 57.9087897864 +46 22 42.553340616           G5 76 0
3 Kepler-1661 EB* 19 00 40.1133544368 +41 58 01.388561232           K1 27 0
4 Kepler-38 EB* 19 07 19.2812772264 +42 16 45.121212624           ~ 100 1
5 Kepler-413 EB* 19 14 02.5619727768 +51 09 45.019100160           ~ 80 0
6 Kepler-16 SB* 19 16 18.1758378936 +51 45 26.782726104   12.1   11.90   K7V 244 1
7 Kepler-35 EB* 19 37 59.2726213344 +46 41 22.952695956           ~ 135 1
8 Kepler-47b Pl 19 41 11.4983203032 +46 55 13.707336288           ~ 76 1
9 Kepler-47d Pl 19 41 11.4983203032 +46 55 13.707336288           ~ 26 0
10 Kepler-47c Pl 19 41 11.4983203032 +46 55 13.707336288           ~ 68 1
11 Kepler-34 EB* 19 45 44.5974898536 +44 38 29.610983076           ~ 161 1
12 Kepler-1647 EB* 19 52 36.0203935200 +40 39 22.342749552           F5 67 0
13 Kepler-64 EB* 19 52 51.6169691968 +39 57 18.370395541           F0 98 1

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