Dynamical models to explain observations with SPHERE in planetary systems with double debris belts
Abstract
A large number of systems harboring a debris disk show evidence for a double belt architecture. One hypothesis for explaining the gap between the belts is the presence of one or more planets dynamically carving it. This work aims to investigate this scenario in systems harboring two components debris disks. All the targets in the sample were observed with the SPHERE instrument which performs high-contrast direct imaging. Positions of the inner and outer belts were estimated by SED fitting of the infrared excesses or, when available, from resolved images of the disk. Very few planets have been observed so far in debris disks gaps and we intended to test if such non-detections depend on the observational limits of the present instruments. This aim is achieved by deriving theoretical predictions of masses, eccentricities and semi-major axes of planets able to open the observed gaps and comparing such parameters with detection limits obtained with SPHERE. The relation between the gap and the planet is due to the chaotic zone around the orbit of the planet. The radial extent of this zone depends on the mass ratio between the planet and the star, on the semi-major axis and on the eccentricity of the planet and it can be estimated analytically. We apply the formalism to the case of one planet on a circular or eccentric orbit. We then consider multi-planetary systems: 2 and 3 equal-mass planets on circular orbits and 2 equal-mass planets on eccentric orbits in a packed configuration. We then compare each couple of values (M,a), derived from the dynamical analysis of single and multiple planetary models, with the detection limits obtained with SPHERE. Our results show that the apparent lack of planets in gaps between double belts could be explained by the presence of a system of two or more planets possibly of low mass and on an eccentric orbits whose sizes are below the present detection limits.
Cite
@article{arxiv.1710.03019,
title = {Dynamical models to explain observations with SPHERE in planetary systems with double debris belts},
author = {C. Lazzoni and S. Desidera and F. Marzari and A. Boccaletti and M. Langlois and D. Mesa and R. Gratton and Q. Kral and N. Pawellek and J. Olofsson and M. Bonnefoy and G. Chauvin and A. M. Lagrange and A. Vigan and E. Sissa and J. Antichi and H. Avenhaus and A. Baruffolo and J. L. Baudino and A. Bazzon and J. L. Beuzit and B. Biller and M. Bonavita and W. Brandner and P. Bruno and E. Buenzli and F. Cantalloube and E. Cascone and A. Cheetham and R. U. Claudi and M. Cudel and S. Daemgen and V. De Caprio and P. Delorme and D. Fantinel and G. Farisato and M. Feldt and R. Galicher and C. Ginski and J. Girard and E. Giro and M. Janson and J. Hagelberg and T. Henning and S. Incorvaia and M. Kasper and T. Kopytova and J. Lannier and H. LeCoroller and L. Lessio and R. Ligi and A. L. Maire and F. Ménard and M. Meyer and J. Milli and D. Mouillet and S. Peretti and C. Perrot and D. Rouan and M. Samland and B. Salasnich and G. Salter and T. Schmidt and S. Scuderi and E. Sezestre and M. Turatto and S. Udry and F. Wildi and A. Zurlo},
journal= {arXiv preprint arXiv:1710.03019},
year = {2018}
}
Comments
23 pages, 13 figures