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The structure of Chariklo's rings from stellar occultations

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journal contribution
posted on 2023-05-19, 14:44 authored by Berard, D, Sicardy, B, Camargo, JIB, Desmars, J, Braga-Ribas, F, Ortiz, J-L, Duffard, R, Morales, N, Meza, E, Leiva, R, Benedetti-Rossi, G, Vieira-Martins, R, Gomes Junior, A-R, Assafin, M, Colas, F, Dauvergne, J-L, Kervella, P, Lecacheux, J, Maquet, L, Vachier, F, Renner, S, Monard, B, Sickafoose, AA, Breytenbach, H, Genade, A, Beisker, W, Bath, K-L, Bode, H-J, Backes, M, Ivanov, VD, Jehin, E, Gillon, M, Manfroid, J, Pollock, J, Tancredi, G, Roland, S, Salvo, R, Vanzi, L, Herald, D, Gault, D, Kerr, S, Pavlov, H, Kym HillKym Hill, Bradshaw, J, Barry, MA, Cool, A, Lade, B, Andrew ColeAndrew Cole, Broughton, J, Newman, J, Horvat, R, Maybour, D, Giles, D, Davis, L, Paton, RA, Loader, B, Pennell, A, Jaquiery, P-D, Brillant, S, Selman, F, Dumas, C, Herrera, C, Carraro, G, Monaco, L, Maury, A, Peyrot, A, Teng-Chuen-Yu, J-P, Richichi, A, Irawati, P, De Witt, C, Schoenau, P, Prager, R, Colazo, C, Melia, R, Spagnotto, J, Blain, A, Alonso, S, Roman, A, Santos-Sanz, P, Rizos, J-L, Maestre, J-L, Dunham, D
Two narrow and dense rings (called C1R and C2R) were discovered around the Centaur object (10199) Chariklo during a stellar occultation observed on 2013 June 3. Following this discovery, we planned observations of several occultations by Chariklo's system in order to better characterize the physical properties of the ring and main body. Here, we use 12 successful occulations by Chariklo observed between 2014 and 2016. They provide ring profiles (physical width, opacity, edge structure) and constraints on the radii and pole position. Our new observations are currently consistent with the circular ring solution and pole position, to within the ±3.3 km formal uncertainty for the ring radii derived by Braga-Ribas et al. The six resolved C1R profiles reveal significant width variations from ∼5 to 7.5 km. The width of the fainter ring C2R is less constrained, and may vary between 0.1 and 1 km. The inner and outer edges of C1R are consistent with infinitely sharp boundaries, with typical upper limits of one kilometer for the transition zone between the ring and empty space. No constraint on the sharpness of C2R's edges is available. A 1σ upper limit of ∼20 m is derived for the equivalent width of narrow (physical width <4 km) rings up to distances of 12,000 km, counted in the ring plane.


Publication title

Astronomical Journal





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School of Natural Sciences


Univ Chicago Press

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1427 E 60Th St, Chicago, USA, Il, 60637-2954

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Copyright 2017 The American Astronomical Society

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  • Open

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Expanding knowledge in the physical sciences