ephemerides; minor planets; asteroids: individual: Chariklo; occultations; planets and satellites: rings
Abstract :
[en] 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Bérard, D. ; LESIA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Paris Diderot, Sorbonne Paris Cité, France
Sicardy, B. ; LESIA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Paris Diderot, Sorbonne Paris Cité, France
Camargo, J. I. B.; Observatório Nacional/MCTIC, R. General José Cristino 77, RJ 20921-400 Rio de Janeiro, Brazil ; Laboratório Interinstitucional de e-Astronomia—LIneA, Rua Gal. José Cristino 77, Rio de Janeiro- RJ 20921-400, Brazil
Desmars, Josselin; LESIA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Paris Diderot, Sorbonne Paris Cité, France
Braga-Ribas, F.; Observatório Nacional/MCTIC, R. General José Cristino 77, RJ 20921-400 Rio de Janeiro, Brazil ; Laboratório Interinstitucional de e-Astronomia—LIneA, Rua Gal. José Cristino 77, Rio de Janeiro- RJ 20921-400, Brazil ; Federal University of Technology- Paraná (UTFPR/DAFIS), Rua Sete de Setembro, 3165, CEP 80230-901, Curitiba, PR, Brazil
Ortiz, J.-L.; Instituto de Astrofísica de Andalucía, CSIC, Apt. 3004, E-18080 Granada, Spain
Duffard, R. ; Instituto de Astrofísica de Andalucía, CSIC, Apt. 3004, E-18080 Granada, Spain
Morales, N.; Instituto de Astrofísica de Andalucía, CSIC, Apt. 3004, E-18080 Granada, Spain
Meza, E.; LESIA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Paris Diderot, Sorbonne Paris Cité, France
Leiva, R. ; LESIA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Paris Diderot, Sorbonne Paris Cité, France ; Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Santiago, Chile
Benedetti-Rossi, G. ; Observatório Nacional/MCTIC, R. General José Cristino 77, RJ 20921-400 Rio de Janeiro, Brazil ; Laboratório Interinstitucional de e-Astronomia—LIneA, Rua Gal. José Cristino 77, Rio de Janeiro- RJ 20921-400, Brazil
Vieira-Martins, R.; Observatório Nacional/MCTIC, R. General José Cristino 77, RJ 20921-400 Rio de Janeiro, Brazil ; Laboratório Interinstitucional de e-Astronomia—LIneA, Rua Gal. José Cristino 77, Rio de Janeiro- RJ 20921-400, Brazil ; IMCCE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, 77 av. Denfert-Rochereau, F-75014, Paris, France ; Observatório do Valongo/UFRJ, Ladeira Pedro Antonio 43, RJ 20.080-090 Rio de Janeiro, Brazil
Gomes Júnior, A.-R.; Observatório do Valongo/UFRJ, Ladeira Pedro Antonio 43, RJ 20.080-090 Rio de Janeiro, Brazil
Assafin, M. ; Observatório do Valongo/UFRJ, Ladeira Pedro Antonio 43, RJ 20.080-090 Rio de Janeiro, Brazil
Colas, F.; IMCCE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, 77 av. Denfert-Rochereau, F-75014, Paris, France
Dauvergne, J.-L.; Ciel & Espace, Paris, France
Kervella, P. ; LESIA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Paris Diderot, Sorbonne Paris Cité, France ; Unidad Mixta Internacional Franco-Chilena de Astronomía (CNRS UMI 3386), Departamento de Astronomía, Universidad de Chile, Camino El Observatorio 1515, Las Condes, Santiago, Chile
Lecacheux, J.; LESIA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Paris Diderot, Sorbonne Paris Cité, France
Maquet, L. ; IMCCE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, 77 av. Denfert-Rochereau, F-75014, Paris, France
Vachier, F.; IMCCE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, 77 av. Denfert-Rochereau, F-75014, Paris, France
Renner, S. ; IMCCE, Observatoire de Paris, CNRS UMR 8028, Université Lille 1, Observatoire de Lille 1 impasse de l'Observatoire, F-59000 Lille, France
Monard, B.; Kleinkaroo Observatory, Calitzdorp, St. Helena 1B, P.O. Box 281, 6660 Calitzdorp, Western Cape, South Africa
Sickafoose, A. A.; South African Astronomical Observatory, P.O. Box 9, Observatory, 7935, South Africa ; Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology Cambridge, MA 02139-4307, USA
Breytenbach, H.; South African Astronomical Observatory, P.O. Box 9, Observatory, 7935, South Africa ; University of Cape Town, Department of Astronomy, Rondebosch , Cape Town, Western Cape, 7700, South Africa
Genade, A.; South African Astronomical Observatory, P.O. Box 9, Observatory, 7935, South Africa ; University of Cape Town, Department of Astronomy, Rondebosch , Cape Town, Western Cape, 7700, South Africa
Beisker, W.; IOTA/ES, Barthold-Knaust-Strasse 8, D-30459 Hannover, Germany ; Internationale Amateursternwarte e. V., IAS, Hakos/Namibia and Bichlerstr. 46, D-81479 München (Munich), Germany
Bath, K.-L.; IOTA/ES, Barthold-Knaust-Strasse 8, D-30459 Hannover, Germany ; Internationale Amateursternwarte e. V., IAS, Hakos/Namibia and Bichlerstr. 46, D-81479 München (Munich), Germany
Bode, H.-J.; IOTA/ES, Barthold-Knaust-Strasse 8, D-30459 Hannover, Germany ; Internationale Amateursternwarte e. V., IAS, Hakos/Namibia and Bichlerstr. 46, D-81479 München (Munich), Germany
Backes, M.; Department of Physics, University of Namibia, 340 Mandume Ndemufayo Ave, P/Bag 13301, Windhoek, Namibia
Ivanov, V. D. ; ESO, Karl-Schwarzschild-Str. 2, D-85748 Garching bei, München, Germany ; ESO, Alonso de Cordova 3107, Casilla 19001, Santiago 19, Chile
Jehin, Emmanuel ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Manfroid, Jean ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Pollock, J.; Physics and Astronomy Department, Appalachian State University, Boone, NC 28608, USA
Tancredi, G.; Dpto. Astronomia, Facultat de Ciencias, Uruguay
Roland, S.; Observatorio Astronómico Los Molinos, DICYT, MEC, Montevideo, Uruguay
Salvo, R.; Observatorio Astronómico Los Molinos, DICYT, MEC, Montevideo, Uruguay
Vanzi, L.; Department of Electrical Engineering and Center of Astro-Engineering, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Santiago, Chile
Herald, D.; Occultation Section of the Royal Astronomical Society of New Zealand (RASNZ), Wellington, New Zealand ; International Occultation Timing Association (IOTA), P.O. Box 7152, Kent, WA 98042, USA ; Canberra Astronomical Society, Canberra, ACT, Australia
Gault, D.; Occultation Section of the Royal Astronomical Society of New Zealand (RASNZ), Wellington, New Zealand ; Western Sydney Amateur Astronomy Group (WSAAG), Sydney, NSW, Australia
Kerr, S.; Occultation Section of the Royal Astronomical Society of New Zealand (RASNZ), Wellington, New Zealand ; Astronomical Association of Queensland, Queensland, Australia
Pavlov, H.; Occultation Section of the Royal Astronomical Society of New Zealand (RASNZ), Wellington, New Zealand ; International Occultation Timing Association (IOTA), P.O. Box 7152, Kent, WA 98042, USA
Hill, K. M.; School of Physical Sciences, University of Tasmania, Private Bag 37, Hobart, TAS 7001, Australia
Bradshaw, J.; International Occultation Timing Association (IOTA), P.O. Box 7152, Kent, WA 98042, USA ; Samford Valley Observatory, QLD, Australia
Barry, M. A. ; Occultation Section of the Royal Astronomical Society of New Zealand (RASNZ), Wellington, New Zealand ; Electrical and Information Engineering Department, University of Sydney, Camperdown, NSW 2006, Australia
Cool, A.; Defence Science & Technology Group, Edinburgh, South Australia ; The Heights Observatory, Modbury Heights, South Australia
Lade, B.; Defence Science & Technology Group, Edinburgh, South Australia ; The Heights Observatory, Modbury Heights, South Australia ; Stockport Observatory, Astronomical Society of South Australia, Stockport, SA, Australia
Cole, A. ; School of Physical Sciences, University of Tasmania, Private Bag 37, Hobart, TAS 7001, Australia
Broughton, J.; Occultation Section of the Royal Astronomical Society of New Zealand (RASNZ), Wellington, New Zealand
Newman, J.; Canberra Astronomical Society, Canberra, ACT, Australia
Horvat, R.; Western Sydney Amateur Astronomy Group (WSAAG), Sydney, NSW, Australia
Maybour, D.; Penrith Observatory, Western Sydney University, Sydney, NSW, Australia
Giles, D.; Western Sydney Amateur Astronomy Group (WSAAG), Sydney, NSW, Australia ; Penrith Observatory, Western Sydney University, Sydney, NSW, Australia
Davis, L.; Western Sydney Amateur Astronomy Group (WSAAG), Sydney, NSW, Australia
Paton, R. A.; Western Sydney Amateur Astronomy Group (WSAAG), Sydney, NSW, Australia
Loader, B.; Occultation Section of the Royal Astronomical Society of New Zealand (RASNZ), Wellington, New Zealand ; International Occultation Timing Association (IOTA), P.O. Box 7152, Kent, WA 98042, USA
Pennell, A.; Occultation Section of the Royal Astronomical Society of New Zealand (RASNZ), Wellington, New Zealand ; Dunedin Astronomical Society, Dunedin, New Zealand
Jaquiery, P.-D.; Dunedin Astronomical Society, Dunedin, New Zealand ; Royal Astronomical Society of New Zealand (RASNZ), Wellington, New Zealand
Brillant, S.; ESO, Alonso de Cordova 3107, Casilla 19001, Santiago 19, Chile
Selman, F.; ESO, Alonso de Cordova 3107, Casilla 19001, Santiago 19, Chile
Dumas, C.; TMT International Observatory, 100 West Walnut Street, Suite 300, Pasadena, CA 91124, USA
Herrera, C.; ESO, Alonso de Cordova 3107, Casilla 19001, Santiago 19, Chile
Carraro, G. ; Dipartimento di Fisica e Astronomia, Universita di Padova, Italy
Monaco, L. ; Departamento de Ciencias Fisicas, Universidad Andres Bello, Fernandez Concha 700, Santiago, Chile
Maury, A.; San Pedro de Atacama Celestial Explorations, Casilla 21, San Pedro de Atacama, Chile
Peyrot, A.; Makes Observatory, La Réunion, France
Teng-Chuen-Yu, J.-P.; Makes Observatory, La Réunion, France
Richichi, A. ; INAF—Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy
Irawati, P.; National Astronomical Research Institute of Thailand, Siriphanich Building, Chiang Mai 50200, Thailand
De Witt, C.; IOTA/ES, Barthold-Knaust-Strasse 8, D-30459 Hannover, Germany
Prager, R.; Internationale Amateursternwarte e. V., IAS, Hakos/Namibia and Bichlerstr. 46, D-81479 München (Munich), Germany
Colazo, C.; Ministerio de Educación de la Provincia de Córdoba, Córdoba, Argentina ; Observatorio Astronómico, Universidad Nacional de Córdoba, Córdoba, Argentina
Melia, R.; Observatorio Astronómico, Universidad Nacional de Córdoba, Córdoba, Argentina
Spagnotto, J.; Observatorio El Catalejo, Santa Rosa, La Pampa, Argentina
Blain, A.; Asociación Argentina Amigos de la Astronomía, Av. Patricias Argentinas 550, Buenos Aires, Argentina
Alonso, S.; Software Engineering Department, University of Granada, Spain
Román, A.; Sociedad Astronómica Granadina, Granada, Spain
Santos-Sanz, P. ; Instituto de Astrofísica de Andalucía, CSIC, Apt. 3004, E-18080 Granada, Spain
Rizos, J.-L.; Instituto de Astrofísica de Andalucía, CSIC, Apt. 3004, E-18080 Granada, Spain
Maestre, J.-L.; Observatorio Astronómico de Albox, Apt. 63, E-04800 Albox (Almeria), Spain
Dunham, D.; International Occultation Timing Association (IOTA), P.O. Box 7152, Kent, WA 98042, USA)
Boissel Y., Sicardy B., Roques F. et al 2014 A&A 561 A144
Braga-Ribas F., Sicardy B., Ortiz J. L. et al 2014 Natur 508 72
Camargo J. I. B., Vieira-Martins R., Assafin M. et al 2014 A&A 561 A37
Chiang E. I. and Goldreich P. 2000 ApJ 540 1084
Coppejans R., Gulbis A. A. S., Kotze M. M. et al 2013 PASP 125 976
Cuzzi J. N. 1985 Icar 63 312
Desmars J., Camargo J. I. B., Braga-Ribas F. et al 2015 A&A 584 A96
Duffard R., Pinilla-Alonso N., Ortiz J. L. et al 2014 A&A 568 A79
Elliot J. L., French R. G., Meech K. J. and Elias J. H. 1984 AJ 89 1587
Elliot J. L. and Nicholson P. D. 1984 Planetary Rings, The rings of Uranus (Tucson, AZ: Univ. Arizona Press) 25
Fitzpatrick E. L. 1999 PASP 111 63
Fornasier S., Lazzaro D., Alvarez-Candal A. et al 2014 A&A 568 L11
French R. G., Elliot J. L. and Levine S. E. 1986 Icar 67 134
French R. G., Nicholson P. D., Hedman M. M. et al 2016 Icar 279 62
French R. G., Nicholson P. D., Porco C. C. and Marouf E. A. 1991 Uranus, Dynamics and Structure of the Uranian Rings (Tucson, AZ: Univ. Arizona Press) 327
Gaia Collaboration, Brown A. G. A., Vallenari A. et al 2016 A&A 595 A2
Goldreich P. and Tremaine S. 1979 Natur 277 97
Horner J., Evans N. W. and Bailey M. E. 2004 MNRAS 354 798
Leiva R., Sicardy B., Camargo J. I. B. et al 2017 AJ submitted
Mosqueira I. and Estrada P. R. 2002 Icar 158 545
Ortiz J. L., Duffard R. and Pinilla-Alonso N. 2015 A&A 576 A18
Pan M. and Wu Y. 2016 AJ 821 18
Press W. H., Teukolsky S. A., Vetterling W. T. and Flannery B. P. 1992 Numerical Recipes in FORTRAN. The Art of Scientific Computing (Cambridge: Cambridge Univ. Press)
Roques F., Moncuquet M. and Sicardy B. 1987 AJ 93 1549
Ruprecht J. D., Bosh A. S. and Person M. J. 2015 Icar 252 271
Sicardy B., Benedetti-Rossi G., Buie M. W. et al 2015a European Planetary Science Congress 2015, Observations of Chariklo's Rings in 2015 EPSC2015-750 http://meetingorganizer.copernicus.org/EPSC2015/EPSC2015
Sicardy B., Buie M. W., Benedetti-Rossi G. et al 2015b AAS/DPS Meeting 47 Abstracts 104.01
Sicardy B., El Moutamid M., Quillen A. C. et al 2016 arXiv:1612.03321
