Refined physical parameters for Chariklo's body and rings from stellar occultations observed between 2013 and 2020

B. E. Morgado; B. Sicardy; F. Braga-Ribas; J. Desmars; A. R. Gomes-Júnior; D. Bérard; R. Leiva; J. L. Ortiz; R. Vieira-Martins; G. Benedetti-Rossi; P. Santos-Sanz; J. I. B. Camargo; R. Duffard; F. L. Rommel; M. Assafin; R. C. Boufleur; F. Colas; M. Kretlow; W. Beisker; R. Sfair; C. Snodgrass; N. Morales; E. Fernández-Valenzuela; L. S. Amaral; A. Amarante; R. A. Artola; M. Backes; K-L Bath; S. Bouley; M. W. Buie; P. Cacella; C. A. Colazo; J. P. Colque; J-L Dauvergne; M. Dominik; M. Emilio; C. Erickson; R. Evans; J. Fabrega-Polleri; D. Garcia-Lambas; B. L. Giacchini; W. Hanna; D. Herald; G. Hesler; T. C. Hinse; C. Jacques; E. Jehin; U. G. Jørgensen; S. Kerr; V. Kouprianov; S. E. Levine; T. Linder; P. D. Maley; D. I. Machado; L. Maquet; A. Maury; R. Melia; E. Meza; B. Mondon; T. Moura; J. Newman; T. Payet; C. L. Pereira; J. Pollock; R. C. Poltronieri; F. Quispe-Huaynasi; D. Reichart; T. de Santana; E. M. Schneiter; M. V. Sieyra; J. Skottfelt; J. F. Soulier; M. Starck; P. Thierry; P. J. Torres; L. L. Trabuco; E. Unda-Sanzana; T. A. R. Yamashita; O. C. Winter; A. Zapata; C. A. Zuluaga

Refined physical parameters for Chariklo's body and rings from stellar occultations observed between 2013 and 2020

B. E. Morgado^*, B. Sicardy, F. Braga-Ribas, J. Desmars, A. R. Gomes-Júnior, D. Bérard, R. Leiva, J. L. Ortiz, R. Vieira-Martins, G. Benedetti-Rossi, P. Santos-Sanz, J. I. B. Camargo, R. Duffard, F. L. Rommel, M. Assafin, R. C. Boufleur, F. Colas, M. Kretlow, W. Beisker, R. SfairC. Snodgrass, N. Morales, E. Fernández-Valenzuela, L. S. Amaral, A. Amarante, R. A. Artola, M. Backes, K-L Bath, S. Bouley, M. W. Buie, P. Cacella, C. A. Colazo, J. P. Colque, J-L Dauvergne, M. Dominik, M. Emilio, C. Erickson, R. Evans, J. Fabrega-Polleri, D. Garcia-Lambas, B. L. Giacchini, W. Hanna, D. Herald, G. Hesler, T. C. Hinse, C. Jacques, E. Jehin, U. G. Jørgensen, S. Kerr, V. Kouprianov, S. E. Levine, T. Linder, P. D. Maley, D. I. Machado, L. Maquet, A. Maury, R. Melia, E. Meza, B. Mondon, T. Moura, J. Newman, T. Payet, C. L. Pereira, J. Pollock, R. C. Poltronieri, F. Quispe-Huaynasi, D. Reichart, T. de Santana, E. M. Schneiter, M. V. Sieyra, J. Skottfelt, J. F. Soulier, M. Starck, P. Thierry, P. J. Torres, L. L. Trabuco, E. Unda-Sanzana, T. A. R. Yamashita, O. C. Winter, A. Zapata, C. A. Zuluaga

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

The Centaur (10199) Chariklo has the first rings system discovered around a small object. It was first observed using stellar occultation in 2013. Stellar occultations allow the determination of sizes and shapes with kilometre accuracy and obtain characteristics of the occulting object and its vicinity. Using stellar occultations observed between 2017 and 2020, we aim at constraining Chariklo's and its rings physical parameters. We also determine the rings' structure, and obtain precise astrometrical positions of Chariklo. We predicted and organised several observational campaigns of stellar occultations by Chariklo. Occultation light curves were measured from the data sets, from which ingress and egress times, and rings' width and opacity were obtained. These measurements, combined with results from previous works, allow us to obtain significant constraints on Chariklo's shape and rings' structure. We characterise Chariklo's ring system (C1R and C2R), and obtain radii and pole orientations that are consistent with, but more accurate than, results from previous occultations. We confirmed the detection of W-shaped structures within C1R and an evident variation of radial width. The observed width ranges between 4.8 and 9.1 km with a mean value of 6.5 km. One dual observation (visible and red) does not reveal any differences in the C1R opacity profiles, indicating ring particle's size larger than a few microns. The C1R ring eccentricity is found to be smaller than 0.022 (3-sigma), and its width variations may indicate an eccentricity higher than 0.005. We fit a tri-axial shape to Chariklo's detections over eleven occultations and determine that Chariklo is consistent with an ellipsoid with semi-axes of 143.8, 135.2 and 99.1 km. Ultimately, we provided seven astrometric positions at a milliarcseconds accuracy level, based on Gaia EDR3, and use it to improve Chariklo's ephemeris.

Original language	English
Journal	Astronomy and Astrophysics
Publication status	Accepted/In press - 12 Jul 2021

Keywords / Materials (for Non-textual outputs)

astro-ph.EP

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2107.07904v1Accepted author manuscript, 9.43 MB

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Morgado, B. E., Sicardy, B., Braga-Ribas, F., Desmars, J., Gomes-Júnior, A. R., Bérard, D., Leiva, R., Ortiz, J. L., Vieira-Martins, R., Benedetti-Rossi, G., Santos-Sanz, P., Camargo, J. I. B., Duffard, R., Rommel, F. L., Assafin, M., Boufleur, R. C., Colas, F., Kretlow, M., Beisker, W., ... Zuluaga, C. A. (Accepted/In press). Refined physical parameters for Chariklo's body and rings from stellar occultations observed between 2013 and 2020. Astronomy and Astrophysics.

@article{7a41619755be425c9ac8933fc13aed89,

title = "Refined physical parameters for Chariklo's body and rings from stellar occultations observed between 2013 and 2020",

abstract = " The Centaur (10199) Chariklo has the first rings system discovered around a small object. It was first observed using stellar occultation in 2013. Stellar occultations allow the determination of sizes and shapes with kilometre accuracy and obtain characteristics of the occulting object and its vicinity. Using stellar occultations observed between 2017 and 2020, we aim at constraining Chariklo's and its rings physical parameters. We also determine the rings' structure, and obtain precise astrometrical positions of Chariklo. We predicted and organised several observational campaigns of stellar occultations by Chariklo. Occultation light curves were measured from the data sets, from which ingress and egress times, and rings' width and opacity were obtained. These measurements, combined with results from previous works, allow us to obtain significant constraints on Chariklo's shape and rings' structure. We characterise Chariklo's ring system (C1R and C2R), and obtain radii and pole orientations that are consistent with, but more accurate than, results from previous occultations. We confirmed the detection of W-shaped structures within C1R and an evident variation of radial width. The observed width ranges between 4.8 and 9.1 km with a mean value of 6.5 km. One dual observation (visible and red) does not reveal any differences in the C1R opacity profiles, indicating ring particle's size larger than a few microns. The C1R ring eccentricity is found to be smaller than 0.022 (3-sigma), and its width variations may indicate an eccentricity higher than 0.005. We fit a tri-axial shape to Chariklo's detections over eleven occultations and determine that Chariklo is consistent with an ellipsoid with semi-axes of 143.8, 135.2 and 99.1 km. Ultimately, we provided seven astrometric positions at a milliarcseconds accuracy level, based on Gaia EDR3, and use it to improve Chariklo's ephemeris. ",

keywords = "astro-ph.EP",

author = "Morgado, {B. E.} and B. Sicardy and F. Braga-Ribas and J. Desmars and Gomes-J{\'u}nior, {A. R.} and D. B{\'e}rard and R. Leiva and Ortiz, {J. L.} and R. Vieira-Martins and G. Benedetti-Rossi and P. Santos-Sanz and Camargo, {J. I. B.} and R. Duffard and Rommel, {F. L.} and M. Assafin and Boufleur, {R. C.} and F. Colas and M. Kretlow and W. Beisker and R. Sfair and C. Snodgrass and N. Morales and E. Fern{\'a}ndez-Valenzuela and Amaral, {L. S.} and A. Amarante and Artola, {R. A.} and M. Backes and K-L Bath and S. Bouley and Buie, {M. W.} and P. Cacella and Colazo, {C. A.} and Colque, {J. P.} and J-L Dauvergne and M. Dominik and M. Emilio and C. Erickson and R. Evans and J. Fabrega-Polleri and D. Garcia-Lambas and Giacchini, {B. L.} and W. Hanna and D. Herald and G. Hesler and Hinse, {T. C.} and C. Jacques and E. Jehin and J{\o}rgensen, {U. G.} and S. Kerr and V. Kouprianov and Levine, {S. E.} and T. Linder and Maley, {P. D.} and Machado, {D. I.} and L. Maquet and A. Maury and R. Melia and E. Meza and B. Mondon and T. Moura and J. Newman and T. Payet and Pereira, {C. L.} and J. Pollock and Poltronieri, {R. C.} and F. Quispe-Huaynasi and D. Reichart and Santana, {T. de} and Schneiter, {E. M.} and Sieyra, {M. V.} and J. Skottfelt and Soulier, {J. F.} and M. Starck and P. Thierry and Torres, {P. J.} and Trabuco, {L. L.} and E. Unda-Sanzana and Yamashita, {T. A. R.} and Winter, {O. C.} and A. Zapata and Zuluaga, {C. A.}",

note = "32 pages, 11 Figures in the main text, paper was accepted for publication in Section 10. Planets and planetary systems of Astronomy and Astrophysics on 12/07/2021",

year = "2021",

month = jul,

day = "12",

language = "English",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

Morgado, BE, Sicardy, B, Braga-Ribas, F, Desmars, J, Gomes-Júnior, AR, Bérard, D, Leiva, R, Ortiz, JL, Vieira-Martins, R, Benedetti-Rossi, G, Santos-Sanz, P, Camargo, JIB, Duffard, R, Rommel, FL, Assafin, M, Boufleur, RC, Colas, F, Kretlow, M, Beisker, W, Sfair, R, Snodgrass, C, Morales, N, Fernández-Valenzuela, E, Amaral, LS, Amarante, A, Artola, RA, Backes, M, Bath, K-L, Bouley, S, Buie, MW, Cacella, P, Colazo, CA, Colque, JP, Dauvergne, J-L, Dominik, M, Emilio, M, Erickson, C, Evans, R, Fabrega-Polleri, J, Garcia-Lambas, D, Giacchini, BL, Hanna, W, Herald, D, Hesler, G, Hinse, TC, Jacques, C, Jehin, E, Jørgensen, UG, Kerr, S, Kouprianov, V, Levine, SE, Linder, T, Maley, PD, Machado, DI, Maquet, L, Maury, A, Melia, R, Meza, E, Mondon, B, Moura, T, Newman, J, Payet, T, Pereira, CL, Pollock, J, Poltronieri, RC, Quispe-Huaynasi, F, Reichart, D, Santana, TD, Schneiter, EM, Sieyra, MV, Skottfelt, J, Soulier, JF, Starck, M, Thierry, P, Torres, PJ, Trabuco, LL, Unda-Sanzana, E, Yamashita, TAR, Winter, OC, Zapata, A & Zuluaga, CA 2021, 'Refined physical parameters for Chariklo's body and rings from stellar occultations observed between 2013 and 2020', Astronomy and Astrophysics.

TY - JOUR

T1 - Refined physical parameters for Chariklo's body and rings from stellar occultations observed between 2013 and 2020

AU - Morgado, B. E.

AU - Sicardy, B.

AU - Braga-Ribas, F.

AU - Desmars, J.

AU - Gomes-Júnior, A. R.

AU - Bérard, D.

AU - Leiva, R.

AU - Ortiz, J. L.

AU - Vieira-Martins, R.

AU - Benedetti-Rossi, G.

AU - Santos-Sanz, P.

AU - Camargo, J. I. B.

AU - Duffard, R.

AU - Rommel, F. L.

AU - Assafin, M.

AU - Boufleur, R. C.

AU - Colas, F.

AU - Kretlow, M.

AU - Beisker, W.

AU - Sfair, R.

AU - Snodgrass, C.

AU - Morales, N.

AU - Fernández-Valenzuela, E.

AU - Amaral, L. S.

AU - Amarante, A.

AU - Artola, R. A.

AU - Backes, M.

AU - Bath, K-L

AU - Bouley, S.

AU - Buie, M. W.

AU - Cacella, P.

AU - Colazo, C. A.

AU - Colque, J. P.

AU - Dauvergne, J-L

AU - Dominik, M.

AU - Emilio, M.

AU - Erickson, C.

AU - Evans, R.

AU - Fabrega-Polleri, J.

AU - Garcia-Lambas, D.

AU - Giacchini, B. L.

AU - Hanna, W.

AU - Herald, D.

AU - Hesler, G.

AU - Hinse, T. C.

AU - Jacques, C.

AU - Jehin, E.

AU - Jørgensen, U. G.

AU - Kerr, S.

AU - Kouprianov, V.

AU - Levine, S. E.

AU - Linder, T.

AU - Maley, P. D.

AU - Machado, D. I.

AU - Maquet, L.

AU - Maury, A.

AU - Melia, R.

AU - Meza, E.

AU - Mondon, B.

AU - Moura, T.

AU - Newman, J.

AU - Payet, T.

AU - Pereira, C. L.

AU - Pollock, J.

AU - Poltronieri, R. C.

AU - Quispe-Huaynasi, F.

AU - Reichart, D.

AU - Santana, T. de

AU - Schneiter, E. M.

AU - Sieyra, M. V.

AU - Skottfelt, J.

AU - Soulier, J. F.

AU - Starck, M.

AU - Thierry, P.

AU - Torres, P. J.

AU - Trabuco, L. L.

AU - Unda-Sanzana, E.

AU - Yamashita, T. A. R.

AU - Winter, O. C.

AU - Zapata, A.

AU - Zuluaga, C. A.

N1 - 32 pages, 11 Figures in the main text, paper was accepted for publication in Section 10. Planets and planetary systems of Astronomy and Astrophysics on 12/07/2021

PY - 2021/7/12

Y1 - 2021/7/12

N2 - The Centaur (10199) Chariklo has the first rings system discovered around a small object. It was first observed using stellar occultation in 2013. Stellar occultations allow the determination of sizes and shapes with kilometre accuracy and obtain characteristics of the occulting object and its vicinity. Using stellar occultations observed between 2017 and 2020, we aim at constraining Chariklo's and its rings physical parameters. We also determine the rings' structure, and obtain precise astrometrical positions of Chariklo. We predicted and organised several observational campaigns of stellar occultations by Chariklo. Occultation light curves were measured from the data sets, from which ingress and egress times, and rings' width and opacity were obtained. These measurements, combined with results from previous works, allow us to obtain significant constraints on Chariklo's shape and rings' structure. We characterise Chariklo's ring system (C1R and C2R), and obtain radii and pole orientations that are consistent with, but more accurate than, results from previous occultations. We confirmed the detection of W-shaped structures within C1R and an evident variation of radial width. The observed width ranges between 4.8 and 9.1 km with a mean value of 6.5 km. One dual observation (visible and red) does not reveal any differences in the C1R opacity profiles, indicating ring particle's size larger than a few microns. The C1R ring eccentricity is found to be smaller than 0.022 (3-sigma), and its width variations may indicate an eccentricity higher than 0.005. We fit a tri-axial shape to Chariklo's detections over eleven occultations and determine that Chariklo is consistent with an ellipsoid with semi-axes of 143.8, 135.2 and 99.1 km. Ultimately, we provided seven astrometric positions at a milliarcseconds accuracy level, based on Gaia EDR3, and use it to improve Chariklo's ephemeris.

AB - The Centaur (10199) Chariklo has the first rings system discovered around a small object. It was first observed using stellar occultation in 2013. Stellar occultations allow the determination of sizes and shapes with kilometre accuracy and obtain characteristics of the occulting object and its vicinity. Using stellar occultations observed between 2017 and 2020, we aim at constraining Chariklo's and its rings physical parameters. We also determine the rings' structure, and obtain precise astrometrical positions of Chariklo. We predicted and organised several observational campaigns of stellar occultations by Chariklo. Occultation light curves were measured from the data sets, from which ingress and egress times, and rings' width and opacity were obtained. These measurements, combined with results from previous works, allow us to obtain significant constraints on Chariklo's shape and rings' structure. We characterise Chariklo's ring system (C1R and C2R), and obtain radii and pole orientations that are consistent with, but more accurate than, results from previous occultations. We confirmed the detection of W-shaped structures within C1R and an evident variation of radial width. The observed width ranges between 4.8 and 9.1 km with a mean value of 6.5 km. One dual observation (visible and red) does not reveal any differences in the C1R opacity profiles, indicating ring particle's size larger than a few microns. The C1R ring eccentricity is found to be smaller than 0.022 (3-sigma), and its width variations may indicate an eccentricity higher than 0.005. We fit a tri-axial shape to Chariklo's detections over eleven occultations and determine that Chariklo is consistent with an ellipsoid with semi-axes of 143.8, 135.2 and 99.1 km. Ultimately, we provided seven astrometric positions at a milliarcseconds accuracy level, based on Gaia EDR3, and use it to improve Chariklo's ephemeris.

KW - astro-ph.EP

M3 - Article

SN - 0004-6361

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

ER -

Refined physical parameters for Chariklo's body and rings from stellar occultations observed between 2013 and 2020

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