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A ring system detected around the Centaur (10199) Chariklo

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arxiv 1409.7259 v1 pith:ETCDDRET submitted 2014-09-25 astro-ph.EP

A ring system detected around the Centaur (10199) Chariklo

F. Braga-Ribas , B. Sicardy , J. L. Ortiz , C. Snodgrass , F. Roques , R. Vieira-Martins , J. I. B. Camargo , M. Assafin
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R. Duffard E. Jehin J. Pollock R. Leiva M. Emilio D. I. Machado C. Colazo E. Lellouch J. Skottfelt M. Gillon N. Ligier L. Maquet G. Benedetti-Rossi A. Ramos Gomes Jr P. Kervella H. Monteiro R. Sfair M. El Moutamid G. Tancredi J. Spagnotto A. Maury N. Morales R. Gil-Hutton S. Roland A. Ceretta S.-h. Gu X.-b. Wang K. Harps{\o}e M. Rabus J. Manfroid C. Opitom L. Vanzi L. Mehret L. Lorenzini E. M. Schneiter R. Melia J. Lecacheux F. Colas F. Vachier T. Widemann L. Almenares R. G. Sandness F. Char V. Perez P. Lemos N. Martinez U. G. J{\o}rgensen M. Dominik F. Roig D. E. Reichart A. P. LaCluyze J. B. Haislip K. M. Ivarsen J. P. Moore N. R. Frank D. G. Lambas
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Until now, rings have been detected in the Solar System exclusively around the four giant planets. Here we report the discovery of the first minor-body ring system around the Centaur object (10199) Chariklo, a body with equivalent radius 124$\pm$9 km. A multi-chord stellar occultation revealed the presence of two dense rings around Chariklo, with widths of about 7 km and 3 km, optical depths 0.4 and 0.06, and orbital radii 391 and 405 km, respectively. The present orientation of the ring is consistent with an edge-on geometry in 2008, thus providing a simple explanation for the dimming of Chariklo's system between 1997 and 2008, and for the gradual disappearance of ice and other absorption features in its spectrum over the same period. This implies that the rings are partially composed of water ice. These rings may be the remnants of a debris disk, which were possibly confined by embedded kilometre-sized satellites.

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