Study of the Plutino Object (208996) 2003 AZ(84) 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-Junior; 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; Avishay Gal-Yam; R. Garcia-Lozano; M. Gillon; E. Jehin; Shai Kaspi; A. Klotz; J. Lecacheux; P. Mahasena; J. Manfroid; Ilan Manulis; A. Maury; Vishnu Mohan; N. Morales; Eran Oded 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

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Study of the Plutino Object (208996) 2003 AZ(84) from Stellar Occultations: Size, Shape, and Topographic Features

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Study of the Plutino Object (208996) 2003 AZ(84) 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-Junior, …

Astronomical Journal, Vol.154(1), 22

Jul/2017

DOI: https://doi.org/10.3847/1538-3881/aa74e9

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Abstract

We present results derived from four stellar occultations by the plutino object (208996) 2003. AZ(84), 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. AZ(84)'s shape. Instead, assuming hydrostatic equilibrium, we find that a Jacobi triaxial solution with semiaxes (470 +/- 20) x (383 +/- 10) x (245 +/- 8) 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 rho = 0.87 +/- 0.01g cm(-3), a geometric albedo p(V) = 0.097 +/- 0.009. A grazing chord observed during the 2014 occultation reveals a topographic feature along 2003. AZ(84) ' s limb, which can be interpreted as an abrupt chasm of width similar to 23. km and depth >8 km, or a smooth depression of width similar to 80. km and depth similar to 13 km (or an intermediate feature between those two extremes).

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Title: Study of the Plutino Object (208996) 2003 AZ(84) from Stellar Occultations; Size, Shape, and Topographic Features
Creators: A. Dias-Oliveira (null) - Observatório Nacional
B. Sicardy (null) - Sorbonne Universite, Observatoire de Paris
J. L. Ortiz (null) - Consejo Superior de Investigaciones Cientificas
F. Braga-Ribas (null) - Universidade Tecnológica Federal do Paraná
R. Leiva (null) - Pontificia Universidad Católica de Chile
R. Vieira-Martins (null) - Université Paris Sciences et Lettres
G. Benedetti-Rossi (null) - Observatório Nacional
J. I. B. Camargo (null) - Observatório Nacional
M. Assafin (null) - Observatório do Valongo, UFRJ
A. R. Gomes-Junior (null) - Observatório do Valongo, UFRJ
T. Baug (null) - Physical Research Laboratory
T. Chandrasekhar (null) - Physical Research Laboratory
J. Desmars (null) - Sorbonne Universite, Observatoire de Paris
R. Duffard (null) - Consejo Superior de Investigaciones Cientificas
P. Santos-Sanz (null) - Consejo Superior de Investigaciones Cientificas
Z. Ergang (null) - Yunnan Observatories
S. Ganesh (null) - Physical Research Laboratory
Y. Ikari (null) - Japan Occultation Information Network (JOIN)
P. Irawati (null) - National Astronomical Research Institute of Thailand
J. Jain (null) - Physical Research Laboratory
Z. Liying (null) - Yunnan Observatories
A. Richichi (null) - National Astronomical Research Institute of Thailand
Q. Shengbang (null) - Yunnan Observatories
R. Behrend (null) - University of Geneva
Z. Benkhaldoun (null) - University of Marrakech Cadi Ayyad
N. Brosch (null) - Tel Aviv University
A. Daassou (null) - University of Marrakech Cadi Ayyad
E. Frappa (null) - Euraster
Avishay Gal-Yam (null) - 972WIS_INST___88
R. Garcia-Lozano (null) - Observatorio de Busot, Spain
M. Gillon (null) - University of Liège
E. Jehin (null) - University of Liège
Shai Kaspi (null) - Tel Aviv University
A. Klotz (null) - Université Toulouse III - Paul Sabatier
J. Lecacheux (null) - Université Paris Sciences et Lettres
P. Mahasena (null) - Observatorium Bosscha, Institut Teknologi Bandung, Indonesia
J. Manfroid (null)
Ilan Manulis (null) - The Weizmann Institute of Science
A. Maury (null)
Vishnu Mohan (null) - The Weizmann Institute of Science
N. Morales (null) - Consejo Superior de Investigaciones Cientificas
Eran Oded Ofek (null) - 972WIS_INST___88
C. Rinner (null) - Sky
A. Sharma (null) - Nikaya Observatory
S. Sposetti (null) - University of Geneva
P. Tanga (null) - Observatoire de la Côte d’Azur
A. Thirouin (null) - Lowell Observatory
F. Vachier (null) - Université Paris Sciences et Lettres
T. Widemann (null) - Sorbonne Universite, Observatoire de Paris
A. Asai (null) - Japan Occultation Information Network (JOIN)
Watanabe Hayato (null) - Japan Occultation Information Network (JOIN)
Watanabe Hiroyuki (null) - Japan Occultation Information Network (JOIN)
M. Owada (null) - Japan Occultation Information Network (JOIN)
H. Yamamura (null) - Japan Occultation Information Network (JOIN)
T. Hayamizu (null) - Japan Occultation Information Network (JOIN)
J. Bradshaw (null) - International Occultation Timing Association (United States, Kent) - IOTA
S. Kerr (null) - Royal Astronomical Society
H. Tomioka (null)
S. Andersson (null) - International Amateur Observatory (Germany, Munich) - IAS
G. Dangl (null)
T. Haymes (null) - British Astronomical Association
R. Naves (null)
G. Wortmann (null) - Archenhold Observatory (Germany, Berlin)
Resource Type: Journal article
Publication Details: Astronomical Journal, Vol.154(1), 22; Jul/2017
Number of pages: 13
Language: English
DOI: https://doi.org/10.3847/1538-3881/aa74e9
Grant note: French grants "Beyond Neptune" [ANR-08-BLAN-0177]; "Beyond Neptune II" [ANR-11-IS56-0002]; European Research Council under the European Community's [H2020 (2014-2020/ERC, 669416]; CONICYT-PCHA/Doctorado [Nacional/2014-21141198]; CAPES [BEX 9110/12-7, 203.173/2016]; FAPERJ/PAPDRJ [E-45/2013, E26/200.464/2015227833]; European Union's Horizon Research and Innovation Programme [687378]; CNPq [306885/2013, 473002/2013-2, 308721/ 2011-0]; Capes/Cofecub [2506/2015]; Faperj [PAPDRJ-45/2013, E-26/203.026/2015, E-26/111.488/2013]; CNPq/PQ2 fellowship [308489/ 2013-6]; Searchlight Observatory Network Funding from Spanish [AYA-2014-56637-C2-1-P]; Proyecto de Excelencia de la Junta de Andaluca [JA 2012FQM1776]; Lowell Observatory We acknowledge support from the French grants "Beyond Neptune" ANR-08-BLAN-0177 and "Beyond Neptune II" ANR-11-IS56-0002. Part of the research leading to these results has received funding from the European Research Council under the European Community's H2020 (2014-2020/ERC Grant Agreement no. 669416 "LUCKY STAR"). A. Dias-Oliveira thanks the support of the following grants: CAPES (BEX 9110/12-7) FAPERJ/PAPDRJ (E-45/2013). R. Leiva acknowledges support from CONICYT-PCHA/Doctorado Nacional/2014-21141198. R. Duffard, J.L. Ortiz, and P. Santos-Sanz have received funding from the European Union's Horizon 2020 Research and Innovation Programme, under Grant Agreement no. 687378. R. Vieira-Martins thanks the following grants: CNPq-306885/2013, Capes/Cofecub-2506/2015, Faperj: PAPDRJ-45/2013 and E-26/203.026/2015. M. Assafin thanks the CNPq (Grants 473002/2013-2 and 308721/2011-0) and FAPERJ (Grant E-26/111.488/2013). J.I.B. Camargo acknowledges a CNPq/PQ2 fellowship 308489/2013-6. This work has made use of data obtained at the Thai National Observatory on Doi Inthanon, operated by NARIT. A. Maury acknowledges the use of the C. Harlingten telescope of the Searchlight Observatory Network Funding from Spanish grant AYA-2014-56637-C2-1-P is acknowledged, as is the Proyecto de Excelencia de la Junta de Andaluca, JA 2012-FQM1776. A. Thirouin acknowledges funding from Lowell Observatory. G.B.R. is thankful for the support of the CAPES (203.173/2016) and FAPERJ/PAPDRJ (E26/200.464/2015-227833) grants. _ALMAME_DELIMITER_
Record Identifier: 993263489503596

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