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Dense and narrow rings discovered around the Centaur object (10199) Chariklo
Sicardy, B.; Braga-Ribas, F.; Benedetti-Rossi, G. et al.
2014In Muinonen, Karri (Ed.) Asteroids, Comets, Meteors - Book of Abstracts
 

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Keywords :
chariklo; occultation; solar system
Abstract :
[en] A stellar occultation observed on June 3, 2013 revealed the unexpected presence of two dense rings around (10199) Chariklo [1], the largest Centaur object known to date with a radius of 124±9 km [2]. The two rings have respective orbital radii, widths, and normal optical depths of a_1= 391 km, W_1= 7 km, τ_1= 0.4 and a_2= 405 km, W_2= 3 km, τ_2= 0.06 [1]. They are separated by a gap of about 9 km with an optical depth less than 0.004 (1-sigma limit). The presence of those rings has been confirmed during another stellar occultation observed from ESO/NTT La Silla, ESO/VLT Paranal and San Pedro de Atacama on February 16, 2014. More results on the azimuthal variations of the rings and mass estimations of their putative shepherding satellites will be presented. This is the first ring system ever observed that does not pertain to a giant planet. The existence of such a system raises several questions as to the origin and evolution of rings around such a small object. This discovery also suggests that rings may be a more frequent feature than previously thought, in particular, around small bodies. Possible models for the ring formation will be proposed. They can be classified into collisional scenarios that disrupted an impactor or a pre-existing satellite, tidal disruption of an inward-migrating satellite, or material produced by a cometary activity of the central body.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Sicardy, B.;  LESIA, Observatoire de Paris, CNRS UMR 8109, Université Pierre et Marie Curie, Université Paris-Diderot, Meudon, France)
Braga-Ribas, F.
Benedetti-Rossi, G.
Ligier, N.
Maquet, Laurent 
Roques, F.
Leiva Espinoza, R.
El Moutamid, M.
Duffard, R.
Morales, N.
Ortiz, J. L.
Snodgrass, C.
Skottfelt, J.
Harpsøe, K.
Jørgensen, U. G.
Jehin, Emmanuel  ;  Université de Liège - ULiège
Pollock, J.
Assafin, M.
Camargo, J.
Desmars, Josselin
Vieira-Martins, R.
Dumas, C.
Ivanov, V.
Maury, A.
Korhonen, H.
Leitzinger, M.
Penttilä, A.
Granvik, M.
Virkki, A.
Fedorets, G.
Wilkman, O.
Kohout, T.
More authors (22 more) Less
Language :
English
Title :
Dense and narrow rings discovered around the Centaur object (10199) Chariklo
Publication date :
01 July 2014
Event name :
Asteroids, Comets, Meteors 2014
Event place :
Helsinki, Finland
Event date :
June 30th – July 4th 2014
By request :
Yes
Audience :
International
Main work title :
Asteroids, Comets, Meteors - Book of Abstracts
Author, co-author :
Muinonen, Karri
Publisher :
University of Helsinki, Helsinki, Finland
ISBN/EAN :
978-952-10-8962-6
Available on ORBi :
since 12 January 2016

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