A ring system detected around the Centaur (10199) Chariklo

Braga-Ribas, F.; Sicardy, B.; Ortiz, J. L.; Snodgrass, C.; Roques, F.; Vieira-Martins, R.; Camargo, J. I. B.; Assafin, M.; Duffárd, R.; Jehin, Emmanuël; Pollock, J.; Leiva, Rodrigo; Emílio, M.; Machado, Daniel Iria; Colazo, C.; Lellouch, E.; Skottfelt, J.; Gillon, M.; Ligier, N.; Maquet, Lucie; Benedetti-Rossi, G.; Gomes, A. Ramos; Kervella, P.; Monteiro, H.; Sfair, R.; Moutamid, Maryame El; Tancredi, G.; Spagnotto, J.; Maury, A.; Morales, N.; Gil-Hutton, R.; Roland, S.; Ceretta, A.; Gu, Shenghong; X.-b., Wang,; Harpsøe, K.; Rabus, M.; Manfroid, Jean; Opitom, Cyrielle; Vanzi, L.; Mehret, L.; Lorenzini, L.; Schneiter, M.; Melia, R.; Lecacheux, J.; Colas, François; Vachier, F.; Widemann, Thomas; Almenares, L.; Sandness, R.; Char, F.; Pérez, Victoria; Lemos, Pablo; Martinez, N. Lorenzo; Jørgensen, U. G.; Dominik, M.; Roig, F.; Reichart, D.; Lacluyzé, A.; Haislip, J.; Ivarsen, K.; Moore, J. P.; Frank, N.; Lambas, D. García

doi:10.1038/nature13155

Cited by 248 publications

(166 citation statements)

References 35 publications

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“…In summary, Braga-Ribas et al (2014) show the detection of the ring system through stellar occultation, and we present evidence here for the ring system based on photometry and spectroscopy. We also derive additional constraints to the rings properties that are not directly obtained from the occultation.…”

Section: Introductionmentioning

confidence: 52%

“…Moreover, there is one spectrum that shows no indication of water ice, which suggests that all the water ice detected on Chariklo would not be on Chariklo's surface but on its rings. One of the ring pole positions derived by Braga-Ribas et al (2014) implies that the rings were seen edge-on in 2007−2008 when no water ice spectral features were observed in Chariklo (Guilbert-Lepoutre 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the observation of a multi-chord stellar occultation reported in Braga-Ribas et al (2014) revealed the presence of two dense rings around Chariklo with widths of about 7 and 4 km, optical depths of 0.4 and 0.06, and orbital radii of 391 and 405 km, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…However, in light of the recent discovery by Braga-Ribas et al (2014), there is another option to explain the photometry: Chariklo's dimming and the overall photometric behavior of Chariklo is related to the change in the aspect angle of a bright and dense ring system around Chariklo.…”

Section: Introductionmentioning

confidence: 99%

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Photometric and spectroscopic evidence for a dense ring system around Centaur Chariklo

Duffárd

Pinilla-Alonso

Ortiz

et al. 2014

A&A

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Context. A stellar occultation observed on 3rd June 2013 revealed the presence of two dense and narrow rings separated by a small gap around the Centaur object (10 199) Chariklo. The composition of these rings is not known. We suspect that water ice is present in the rings, as is the case for Saturn and other rings around the giant planets. Aims. In this work, we aim to determine if the variability in the absolute magnitude of Chariklo and the temporal variation of the spectral ice feature, even when it disappeared in 2007, can be explained by an icy ring system whose aspect angle changes with time. Methods. We explained the variations on the absolute magnitude of Chariklo and its ring by modeling the light reflected by a system as the one described above. Using X-shooter at VLT, we obtained a new reflectance spectra. We compared this new set of data with the ones available in the literature. We showed how the water ice feature is visible in 2013 in accordance with the ring configuration, which had an opening angle of nearly 34 • in 2013. Finally, we also used models of light scattering to fit the visible and near-infrared spectra that shows different characteristics to obtain information on the composition of Chariklo and its rings. Results. We showed that absolute photometry of Chariklo from the literature and new photometric data that we obtained in 2013 can be explained by a ring of particles whose opening angle changes as a function of time. We used the two possible pole solutions for the ring system and found that only one of them, α = 151.30 ± 0.5, δ = 41.48 ± 0.2 • (λ = 137.9 ± 0.5, β = 27.7 ± 0.2 • ), provides the right variation of the aspect angle with time to explain the photometry, whereas the other possible pole solution fails to explain the photometry. From spectral modeling, we derived the composition of the Chariklo surface and that of the rings using the result on the pole solution. Chariklo surface is composed with about 60% of amorphous carbon, 30% of silicates and 10% of organics; no water ice was found on the surface. The ring, on the other hand, contains 20% of water ice, 40−70% of silicates, and 10−30% of tholins and small quantities of amorphous carbon.

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Section: Introductionmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photometric and spectroscopic evidence for a dense ring system around Centaur Chariklo

Duffárd

Pinilla-Alonso

Ortiz

et al. 2014

A&A

Self Cite

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show abstract

“…Scientists have just begun to try to explain the existence of two narrow, welldefined rings around two small Centaurs [1][2][3] (with diameters of 200-250 km). Ortiz a n d c o l l e a g u e s' results require formation mechanisms that are applicable to an object that has 250 times the volume of these Centaurs and an elongated shape, is located substantially farther out in the Solar System and boasts a single ring that is ten times wider than those of the Centaurs.…”

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confidence: 99%