Article (Scientific journals)
The impact crater at the origin of the Julia family detected with VLT/SPHERE?
Vernazza, Pierre; Brož, M.; Drouard, Alexis et al.
2018In Astronomy and Astrophysics
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Keywords :
minor planets; asteroids: individual: (89) Julia; methods: observational; methods: numerical
Abstract :
[en] Context. The vast majority of the geophysical and geological constraints (e.g., internal structure, cratering history) for main belt asteroids have so far been obtained via dedicated interplanetary missions (e.g., ESA Rosetta, NASA Dawn). The high angular resolution of SPHERE/ZIMPOL, the new-generation visible adaptive-optics camera at ESO VLT, implies that these science objectives can now be investigated from the ground for a large fraction of D 100 km main-belt asteroids. The sharp images acquired by this instrument can be used to constrain accurately the shape and thus volume of these bodies (hence density when combined with mass estimates) and to characterize the distribution and topography of D 30 km craters across their surfaces. Aims. Here, we evaluated - via several complementary approaches - the recently proposed hypothesis that S-type asteroid (89) Julia is the parent body of a small compact asteroid family that formed via a cratering collisional event. Methods. We observed (89) Julia with VLT/SPHERE/ZIMPOL throughout its rotation (these observations were taken as part of an ESO Large Program; ID: 199.C-0074), derived its 3D shape and performed a reconnaissance and characterization of the largest craters. We also performed numerical simulations to first confirm the existence of the Julia family and to determine its age as well as the size of the impact crater at its origin. Finally, we utilized the images/3D shape to attempt identifying the origin location of the small collisional family. Results. On the one hand, our VLT/SPHERE observations reveal the presence of a large crater (D~75 km) in Julia’s southern hemisphere. On the other hand, our numerical simulations suggest that (89) Julia was impacted 30 to 120 Myrs ago by a D~8km asteroid, thereby creating a D~60 km impact crater at the surface of Julia. Given the small size of the impactor, the obliquity of Julia and the particular orientation of the family in the (a,i) space, the imaged impact crater is likely the one at the origin of the family. Conclusions. New doors of ground-based asteroid exploration, namely geophysics and geology, are getting opened thanks to VLT/SPHERE’s unique capabilities. Also, the present work may represent the beginning of a new era of asteroid-family studies. In those fields (geophysics, geology and asteroid family studies), the future will only get brighter with the forthcoming arrival of 30-40m class telescopes (ELT, TMT, GMT).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Vernazza, Pierre;  Aix Marseille Univ, CNRS > Laboratoire d’Astrophysique de Marseille
Brož, M.;  Charles University in Prague > Institute of Astronomy
Drouard, Alexis;  Aix Marseille Univ, CNRS, LAM > Laboratoire d’Astrophysique de Marseille
Hanuš, Josef;  Charles University in Prague > Institute of Astronomy
Viikinkoski, Matti;  Tampere University of Technology > Department of Mathematics
Marsset, M.;  Queen’s University Belfast > Astrophysics Research Centre
Jorda, Laurent;  Aix Marseille Univ, CNRS > Laboratoire d’Astrophysique de Marseille
Fetick, R.;  Aix Marseille Univ, CNRS > Laboratoire d’Astrophysique de Marseille
Carry, B.;  Université Côte d’Azur > Observatoire de la Côte d’Azur, CNRS > Laboratoire Lagrange
Marchis, F.;  SETI Institute > Carl Sagan Center
Birlan, M.;  Observatoire de Paris > IMCCE
Fusco, T.;  Aix Marseille Univ, CNRS > Laboratoire d’Astrophysique de Marseille
Santana-Ros, T.;  Adam Mickiewicz University > Astronomical Observatory Institute > Faculty of Physics
Podlewska-Gaca, Edyta;  Adam Mickiewicz University > Astronomical Observatory Institute > Faculty of Physics
Jehin, Emmanuel  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Ferrais, Marin ;  Université de Liège - ULiège > Master sc. spatiales, à fin.
Bartczak, P.;  Adam Mickiewicz University > Astronomical Observatory Institute > Faculty of Physics
Dudzinski, G.;  Adam Mickiewicz University > Astronomical Observatory Institute > Faculty of Physics
Berthier, J.;  Observatoire de Paris > IMCCE
Castillo-Rogez, J.;  California Institute of Technology - CALTECH > Jet Propulsion Laboratory
Cipriani, F.;  European Space Agency > ESTEC > Scientific Support Office
Colas, F.;  Observatoire de Paris > IMCCE
Dumas, C.;  TMT Observatory, Pasadena
Durech, J.;  Charles University in Prague > Institute of Astronomy
Kaasalainen, M.;  Tampere University of Technology > Department of Mathematics
Kryszczynska, A.;  Adam Mickiewicz University > Astronomical Observatory Institute > Faculty of Physics
Lamy, P.;  Aix Marseille Univ, CNRS > Laboratoire d’Astrophysique de Marseille
Le Coroller, H.;  Aix Marseille Univ, CNRS > Laboratoire d’Astrophysique de Marseille
Marciniak, A.;  Adam Mickiewicz University > Astronomical Observatory Institute > Faculty of Physics
Michalowski, T.;  Adam Mickiewicz University > Astronomical Observatory Institute > Faculty of Physics
Michel, P.;  Université Côte d’Azur > Observatoire de la Côte d’Azur, CNRS > Laboratoire Lagrange
Pajuelo, M.;  Observatoire de Paris > IMCCE
Tanga, P.;  Université Côte d’Azur > Observatoire de la Côte d’Azur, CNRS > Laboratoire Lagrange
Vachier, F.;  Observatoire de Paris > IMCCE
Vigan, A.;  Aix Marseille Univ, CNRS > Laboratoire d’Astrophysique de Marseille
Warner, B.;  Center for Solar System Studies
Witasse, E.;  European Space Agency > ESTEC > Scientific Support Office
Yang, B.;  European Southern Observatory (ESO)
Asphaug, E.;  Arizona State University, Tempe > School of Earth and Space Exploration
Richardson, D.C.;  University of Maryland, College Park > Department of Astronomy
Ševecek, P.;  Charles University in Prague > Institute of Astronomy
Gillon, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Benkhaldoun, Z.;  Cadi Ayyad University, Marrakech > High Energy Physics and Astrophysics Laboratory > Oukaimeden Observatory
More authors (33 more) Less
Language :
English
Title :
The impact crater at the origin of the Julia family detected with VLT/SPHERE?
Publication date :
2018
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
Springer, Germany
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 24 August 2018

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