Study of the Plutino Object (208996) 2003 AZ84 from Stellar Occultations: Size, Shape, and Topographic Features

A. Dias-Oliveira; B. Sicardy; J. L. Ortiz; F. Braga-Ribas; R. Leiva; R. Vieira-Martins; G. Benedetti-Rossi; J. I.B. Camargo; M. Assafin; A. R. Gomes-Júnior; T. Baug; T. Chandrasekhar; J. Desmars; R. Duffard; P. Santos-Sanz; Z. Ergang; S. Ganesh; Y. Ikari; P. Irawati; J. Jain; Z. Liying; A. Richichi; Q. Shengbang; R. Behrend; Z. Benkhaldoun; N. Brosch; A. Daassou; E. Frappa; A. Gal-Yam; R. Garcia-Lozano; M. Gillon; E. Jehin; S. Kaspi; A. Klotz; J. Lecacheux; P. Mahasena; J. Manfroid; I. Manulis; A. Maury; V. Mohan; N. Morales; E. Ofek; C. Rinner; A. Sharma; S. Sposetti; P. Tanga; A. Thirouin; F. Vachier; T. Widemann; A. Asai; Watanabe Hayato; Watanabe Hiroyuki; M. Owada; H. Yamamura; T. Hayamizu; J. Bradshaw; S. Kerr; H. Tomioka; S. Andersson; G. Dangl; T. Haymes; R. Naves; G. Wortmann

doi:10.3847/1538-3881/aa74e9

Study of the Plutino Object (208996) 2003 AZ₈₄ from Stellar Occultations: Size, Shape, and Topographic Features

A. Dias-Oliveira^*, B. Sicardy, J. L. Ortiz, F. Braga-Ribas, R. Leiva, R. Vieira-Martins, G. Benedetti-Rossi, J. I.B. Camargo, M. Assafin, A. R. Gomes-Júnior, T. Baug, T. Chandrasekhar, J. Desmars, R. Duffard, P. Santos-Sanz, Z. Ergang, S. Ganesh, Y. Ikari, P. Irawati, J. JainZ. Liying, A. Richichi, Q. Shengbang, R. Behrend, Z. Benkhaldoun, N. Brosch, A. Daassou, E. Frappa, A. Gal-Yam, R. Garcia-Lozano, M. Gillon, E. Jehin, S. Kaspi, A. Klotz, J. Lecacheux, P. Mahasena, J. Manfroid, I. Manulis, A. Maury, V. Mohan, N. Morales, E. Ofek, C. Rinner, A. Sharma, S. Sposetti, P. Tanga, A. Thirouin, F. Vachier, T. Widemann, A. Asai, Watanabe Hayato, Watanabe Hiroyuki, M. Owada, H. Yamamura, T. Hayamizu, J. Bradshaw, S. Kerr, H. Tomioka, S. Andersson, G. Dangl, T. Haymes, R. Naves, G. Wortmann

^*Corresponding author for this work

School of Physics and Astronomy

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

33 Scopus citations

Abstract

We present results derived from four stellar occultations by the plutino object (208996) 2003 AZ₈₄, detected on 2011 January 8 (single-chord event), 2012 February 3 (multi-chord), 2013 December 2 (single-chord), and 2014 November 15 (multi-chord). Our observations rule out an oblate spheroid solution for 2003 AZ₈₄'s shape. Instead, assuming hydrostatic equilibrium, we find that a Jacobi triaxial solution with semiaxes km can better account for all our occultation observations. Combining these dimensions with the rotation period of the body (6.75 hr) and the amplitude of its rotation light curve, we derive a density g cm^-3, a geometric albedo . A grazing chord observed during the 2014 occultation reveals a topographic feature along 2003 AZ₈₄'s limb, which can be interpreted as an abrupt chasm of width ∼23 km and depth km, or a smooth depression of width ∼80 km and depth ∼13 km (or an intermediate feature between those two extremes).

Original language	English
Article number	22
Journal	Astronomical Journal
Volume	154
Issue number	1
DOIs	https://doi.org/10.3847/1538-3881/aa74e9
State	Published - Jul 2017

Funding

Funders	Funder number
Horizon 2020 Framework Programme	669416, 687378

Keywords

Kuiper belt objects: individual (208996, 2003AZ84)
occultations
planets and satellites: fundamental parameters
planets and satellites: surfaces

Access to Document

10.3847/1538-3881/aa74e9

Cite this

Dias-Oliveira, A., Sicardy, B., Ortiz, J. L., Braga-Ribas, F., Leiva, R., Vieira-Martins, R., Benedetti-Rossi, G., Camargo, J. I. B., Assafin, M., Gomes-Júnior, A. R., Baug, T., Chandrasekhar, T., Desmars, J., Duffard, R., Santos-Sanz, P., Ergang, Z., Ganesh, S., Ikari, Y., Irawati, P., ... Wortmann, G. (2017). Study of the Plutino Object (208996) 2003 AZ₈₄ from Stellar Occultations: Size, Shape, and Topographic Features. Astronomical Journal, 154(1), Article 22. https://doi.org/10.3847/1538-3881/aa74e9

@article{738d0fdbf1da475c9f3c7b65a6f2b301,

title = "Study of the Plutino Object (208996) 2003 AZ84 from Stellar Occultations: Size, Shape, and Topographic Features",

abstract = "We present results derived from four stellar occultations by the plutino object (208996) 2003 AZ84, detected on 2011 January 8 (single-chord event), 2012 February 3 (multi-chord), 2013 December 2 (single-chord), and 2014 November 15 (multi-chord). Our observations rule out an oblate spheroid solution for 2003 AZ84's shape. Instead, assuming hydrostatic equilibrium, we find that a Jacobi triaxial solution with semiaxes km can better account for all our occultation observations. Combining these dimensions with the rotation period of the body (6.75 hr) and the amplitude of its rotation light curve, we derive a density g cm-3, a geometric albedo . A grazing chord observed during the 2014 occultation reveals a topographic feature along 2003 AZ84's limb, which can be interpreted as an abrupt chasm of width ∼23 km and depth km, or a smooth depression of width ∼80 km and depth ∼13 km (or an intermediate feature between those two extremes).",

keywords = "Kuiper belt objects: individual (208996, 2003AZ84), occultations, planets and satellites: fundamental parameters, planets and satellites: surfaces",

author = "A. Dias-Oliveira and B. Sicardy and Ortiz, {J. L.} and F. Braga-Ribas and R. Leiva and R. Vieira-Martins and G. Benedetti-Rossi and Camargo, {J. I.B.} and M. Assafin and Gomes-J{\'u}nior, {A. R.} and T. Baug and T. Chandrasekhar and J. Desmars and R. Duffard and P. Santos-Sanz and Z. Ergang and S. Ganesh and Y. Ikari and P. Irawati and J. Jain and Z. Liying and A. Richichi and Q. Shengbang and R. Behrend and Z. Benkhaldoun and N. Brosch and A. Daassou and E. Frappa and A. Gal-Yam and R. Garcia-Lozano and M. Gillon and E. Jehin and S. Kaspi and A. Klotz and J. Lecacheux and P. Mahasena and J. Manfroid and I. Manulis and A. Maury and V. Mohan and N. Morales and E. Ofek and C. Rinner and A. Sharma and S. Sposetti and P. Tanga and A. Thirouin and F. Vachier and T. Widemann and A. Asai and Watanabe Hayato and Watanabe Hiroyuki and M. Owada and H. Yamamura and T. Hayamizu and J. Bradshaw and S. Kerr and H. Tomioka and S. Andersson and G. Dangl and T. Haymes and R. Naves and G. Wortmann",

year = "2017",

month = jul,

doi = "10.3847/1538-3881/aa74e9",

language = "אנגלית",

volume = "154",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

number = "1",

}

Dias-Oliveira, A, Sicardy, B, Ortiz, JL, Braga-Ribas, F, Leiva, R, Vieira-Martins, R, Benedetti-Rossi, G, Camargo, JIB, Assafin, M, Gomes-Júnior, AR, Baug, T, Chandrasekhar, T, Desmars, J, Duffard, R, Santos-Sanz, P, Ergang, Z, Ganesh, S, Ikari, Y, Irawati, P, Jain, J, Liying, Z, Richichi, A, Shengbang, Q, Behrend, R, Benkhaldoun, Z, Brosch, N, Daassou, A, Frappa, E, Gal-Yam, A, Garcia-Lozano, R, Gillon, M, Jehin, E, Kaspi, S, Klotz, A, Lecacheux, J, Mahasena, P, Manfroid, J, Manulis, I, Maury, A, Mohan, V, Morales, N, Ofek, E, Rinner, C, Sharma, A, Sposetti, S, Tanga, P, Thirouin, A, Vachier, F, Widemann, T, Asai, A, Hayato, W, Hiroyuki, W, Owada, M, Yamamura, H, Hayamizu, T, Bradshaw, J, Kerr, S, Tomioka, H, Andersson, S, Dangl, G, Haymes, T, Naves, R & Wortmann, G 2017, 'Study of the Plutino Object (208996) 2003 AZ₈₄ from Stellar Occultations: Size, Shape, and Topographic Features', Astronomical Journal, vol. 154, no. 1, 22. https://doi.org/10.3847/1538-3881/aa74e9

TY - JOUR

T1 - Study of the Plutino Object (208996) 2003 AZ84 from Stellar Occultations

T2 - Size, Shape, and Topographic Features

AU - Dias-Oliveira, A.

AU - Sicardy, B.

AU - Ortiz, J. L.

AU - Braga-Ribas, F.

AU - Leiva, R.

AU - Vieira-Martins, R.

AU - Benedetti-Rossi, G.

AU - Camargo, J. I.B.

AU - Assafin, M.

AU - Gomes-Júnior, A. R.

AU - Baug, T.

AU - Chandrasekhar, T.

AU - Desmars, J.

AU - Duffard, R.

AU - Santos-Sanz, P.

AU - Ergang, Z.

AU - Ganesh, S.

AU - Ikari, Y.

AU - Irawati, P.

AU - Jain, J.

AU - Liying, Z.

AU - Richichi, A.

AU - Shengbang, Q.

AU - Behrend, R.

AU - Benkhaldoun, Z.

AU - Brosch, N.

AU - Daassou, A.

AU - Frappa, E.

AU - Gal-Yam, A.

AU - Garcia-Lozano, R.

AU - Gillon, M.

AU - Jehin, E.

AU - Kaspi, S.

AU - Klotz, A.

AU - Lecacheux, J.

AU - Mahasena, P.

AU - Manfroid, J.

AU - Manulis, I.

AU - Maury, A.

AU - Mohan, V.

AU - Morales, N.

AU - Ofek, E.

AU - Rinner, C.

AU - Sharma, A.

AU - Sposetti, S.

AU - Tanga, P.

AU - Thirouin, A.

AU - Vachier, F.

AU - Widemann, T.

AU - Asai, A.

AU - Hayato, Watanabe

AU - Hiroyuki, Watanabe

AU - Owada, M.

AU - Yamamura, H.

AU - Hayamizu, T.

AU - Bradshaw, J.

AU - Kerr, S.

AU - Tomioka, H.

AU - Andersson, S.

AU - Dangl, G.

AU - Haymes, T.

AU - Naves, R.

AU - Wortmann, G.

PY - 2017/7

Y1 - 2017/7

N2 - We present results derived from four stellar occultations by the plutino object (208996) 2003 AZ84, detected on 2011 January 8 (single-chord event), 2012 February 3 (multi-chord), 2013 December 2 (single-chord), and 2014 November 15 (multi-chord). Our observations rule out an oblate spheroid solution for 2003 AZ84's shape. Instead, assuming hydrostatic equilibrium, we find that a Jacobi triaxial solution with semiaxes km can better account for all our occultation observations. Combining these dimensions with the rotation period of the body (6.75 hr) and the amplitude of its rotation light curve, we derive a density g cm-3, a geometric albedo . A grazing chord observed during the 2014 occultation reveals a topographic feature along 2003 AZ84's limb, which can be interpreted as an abrupt chasm of width ∼23 km and depth km, or a smooth depression of width ∼80 km and depth ∼13 km (or an intermediate feature between those two extremes).

AB - We present results derived from four stellar occultations by the plutino object (208996) 2003 AZ84, detected on 2011 January 8 (single-chord event), 2012 February 3 (multi-chord), 2013 December 2 (single-chord), and 2014 November 15 (multi-chord). Our observations rule out an oblate spheroid solution for 2003 AZ84's shape. Instead, assuming hydrostatic equilibrium, we find that a Jacobi triaxial solution with semiaxes km can better account for all our occultation observations. Combining these dimensions with the rotation period of the body (6.75 hr) and the amplitude of its rotation light curve, we derive a density g cm-3, a geometric albedo . A grazing chord observed during the 2014 occultation reveals a topographic feature along 2003 AZ84's limb, which can be interpreted as an abrupt chasm of width ∼23 km and depth km, or a smooth depression of width ∼80 km and depth ∼13 km (or an intermediate feature between those two extremes).

KW - Kuiper belt objects: individual (208996, 2003AZ84)

KW - occultations

KW - planets and satellites: fundamental parameters

KW - planets and satellites: surfaces

UR - http://www.scopus.com/inward/record.url?scp=85024406375&partnerID=8YFLogxK

U2 - 10.3847/1538-3881/aa74e9

DO - 10.3847/1538-3881/aa74e9

M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???

AN - SCOPUS:85024406375

SN - 0004-6256

VL - 154

JO - Astronomical Journal

JF - Astronomical Journal

IS - 1

M1 - 22

ER -