The Structure of Chariklo’s Rings from Stellar Occultations

DOI: 
10.3847/1538-3881/aa830d
Publication date: 
01/10/2017
Main author: 
Bérard, D.
IAA authors: 
Ortiz, J. -L.;Duffard, R.;Morales, N.;Santos-Sanz, P.;Rizos, J. -L.
Authors: 
Bérard, D.;Sicardy, B.;Camargo, J. I. B.;Desmars, J.;Braga-Ribas, F.;Ortiz, J. -L.;Duffard, R.;Morales, N.;Meza, E.;Leiva, R.;Benedetti-Rossi, G.;Vieira-Martins, R.;Gomes Júnior, A. -R.;Assafin, M.;Colas, F.;Dauvergne, J. -L.;Kervella, P.;Lecacheux, J.;Maquet, L.;Vachier, F.;Renner, S.;Monard, B.;Sickafoose, A. A.;Breytenbach, H.;Genade, A.;Beisker, W.;Bath, K. -L.;Bode, H. -J.;Backes, M.;Ivanov, V. D.;Jehin, E.;Gillon, M.;Manfroid, J.;Pollock, J.;Tancredi, G.;Roland, S.;Salvo, R.;Vanzi, L.;Herald, D.;Gault, D.;Kerr, S.;Pavlov, H.;Hill, K. M.;Bradshaw, J.;Barry, M. A.;Cool, A.;Lade, B.;Cole, A.;Broughton, J.;Newman, J.;Horvat, R.;Maybour, D.;Giles, D.;Davis, L.;Paton, R. A.;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.;Román, A.;Santos-Sanz, P.;Rizos, J. -L.;Maestre, J. -L.;Dunham, D.
Journal: 
The Astronomical Journal
Refereed: 
Yes
Publication type: 
Article
Volume: 
154
Pages: 
144
Abstract: 

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.

Database: 
ADS
SCOPUS
URL: 
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85031126278&doi=10.3847%2f1538-3881%2faa830d&partnerID=40&md5=37371a457903490b2a25919018808d6a
ADS Bibcode: 
2017AJ....154..144B
Keywords: 
ephemerides;minor planets;asteroids: individual: Chariklo;occultations;planets and satellites: rings