1. Study of the Plutino Object (208996) 2003 AZ 84 from Stellar Occultations: Size, Shape, and Topographic Features
- Author
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A. Klotz, Julio Camargo, T. Hayamizu, Shashikiran Ganesh, Noah Brosch, Felipe Braga-Ribas, Avishay Gal-Yam, Paolo Tanga, J. L. Ortiz, J. Bradshaw, S. Andersson, G. Dangl, H. Tomioka, Rodrigo Leiva, Marcelo Assafin, A. Sharma, Andrea Richichi, Emmanuel Jehin, S. Sposetti, Tapas Baug, Frédéric Vachier, Zhao Ergang, T. Chandrasekhar, Zhu Liying, H. Yamamura, Shai Kaspi, Hayato Watanabe, Puji Irawati, E. Frappa, R. Naves, Eran O. Ofek, Thomas Widemann, Zouhair Benkhaldoun, Nora Morales, C. Rinner, Qian Shengbang, Alain Maury, Pablo Santos-Sanz, Ilan Manulis, Rene Duffard, Yasukazu Ikari, S. Kerr, A. Dias-Oliveira, Raoul Behrend, Jean Manfroid, Vishnu Mohan, J. Jain, Audrey Thirouin, G. Wortmann, A. Daassou, A. R. Gomes-Junior, Michaël Gillon, Hiroyuki Watanabe, Jean Lecacheux, G. Benedetti-Rossi, P. Mahasena, M. Owada, Josselin Desmars, Roberto Vieira-Martins, A. Asai, R. Garcia-Lozano, Bruno Sicardy, T. Haymes, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Institut de Mécanique Céleste et de Calcul des Ephémérides (IMCCE), Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Joseph Louis LAGRANGE (LAGRANGE), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Observatorio Nacional [Rio de Janeiro], Observatório Nacional/MCT, Observatório do Valongo/UFRJ [Rio de Janeiro], Universidade Federal do Rio de Janeiro (UFRJ), Instituto de Astrofísica de Andalucía (IAA), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Physical Research Laboratory [Ahmedabad] (PRL), and Indian Space Research Organisation (ISRO)
- Subjects
Rotation period ,Chord (geometry) ,[PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM] ,010504 meteorology & atmospheric sciences ,[PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] ,FOS: Physical sciences ,[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] ,Astrophysics ,Rotation ,01 natural sciences ,Occultation ,law.invention ,[SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology ,Geometric albedo ,law ,0103 physical sciences ,010303 astronomy & astrophysics ,ComputingMilieux_MISCELLANEOUS ,0105 earth and related environmental sciences ,Earth and Planetary Astrophysics (astro-ph.EP) ,Physics ,[PHYS]Physics [physics] ,Astronomy and Astrophysics ,Light curve ,[PHYS.PHYS.PHYS-SPACE-PH]Physics [physics]/Physics [physics]/Space Physics [physics.space-ph] ,Amplitude ,Space and Planetary Science ,Hydrostatic equilibrium ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,[PHYS.PHYS.PHYS-DATA-AN]Physics [physics]/Physics [physics]/Data Analysis, Statistics and Probability [physics.data-an] ,Astrophysics - Earth and Planetary Astrophysics - Abstract
We present results derived from four stellar occultations by the plutino object (208996) 2003~AZ$_{84}$, detected at January 8, 2011 (single-chord event), February 3, 2012 (multi-chord), December 2, 2013 (single-chord) and November 15, 2014 (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 semi axes $(470 \pm 20) \times (383 \pm 10) \times (245 \pm 8)$~km % axis ratios $b/a= 0.82 \pm 0.05$ and $c/a= 0.52 \pm 0.02$, can better account for all our occultation observations. Combining these dimensions with the rotation period of the body (6.75~h) and the amplitude of its rotation light curve, we derive a density $��=0.87 \pm 0.01$~g~cm$^{-3}$ a geometric albedo $p_V= 0.097 \pm 0.009$. A grazing chord observed during the 2014 occultation reveals a topographic feature along 2003~AZ$_{84}$'s limb, that can be interpreted as an abrupt chasm of width $\sim 23$~km and depth $> 8$~km or a smooth depression of width $\sim 80$~km and depth $\sim 13$~km (or an intermediate feature between those two extremes).
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