Refined physical parameters for Chariklo?s body and rings from stellar occultations observed between 2013 and 2020

MORGADO, B.E.; SICARDY, B; F. BRAGA-RIBAS; J. DESMARS; A. R. GOMES-JÚNIOR; D. BÉRARD; R. LEIVA; J. L. ORTIZ; R. VIEIRA-MARTINS; G. BENEDETTI-ROSSI; P. SANTOS-SANZ; SCHNEITER, E M (AUTOR 69)

ASTRONOMY AND ASTROPHYSICS

EDP SCIENCES S A

Lugar: Paris; Año: 2021 vol. 652

0004-6361

ontext. The Centaur (10199) Chariklo has the first ring system discovered around a small object. It was first observed using stellar occultation in 2013. Stellar occultations allow sizes and shapes to be determined with kilometre accuracy, and provide the characteristics of the occulting object and its vicinity. Aims. Using stellar occultations observed between 2017 and 2020, our aim is to constrain the physical parameters of Chariklo and its rings. We also determine the structure of the rings, and obtain precise astrometrical positions of Chariklo. Methods. We predicted and organised several observational campaigns of stellar occultations by Chariklo. Occultation light curveswere measured from the datasets, from which ingress and egress times, and the ring widths and opacity values were obtained. These measurements, combined with results from previous works, allow us to obtain significant constraints on Chariklo?s shape and ring structure.Results. We characterise Chariklo?s ring syst