Reference : The impact crater at the origin of the Julia family detected with VLT/SPHERE?
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/227308
The impact crater at the origin of the Julia family detected with VLT/SPHERE?
English
Vernazza, Pierre mailto [Aix Marseille Univ, CNRS > Laboratoire d’Astrophysique de Marseille > > >]
Brož, M. [Charles University in Prague > Institute of Astronomy > > >]
Drouard, A. [Aix Marseille Univ, CNRS, LAM > Laboratoire d’Astrophysique de Marseille > > >]
Hanuš, J. [Charles University in Prague > Institute of Astronomy > > >]
Viikinkoski, M. [Tampere University of Technology > Department of Mathematics > > >]
Marsset, M. [Queen’s University Belfast > Astrophysics Research Centre > > >]
Jorda, L. [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, E. [Adam Mickiewicz University > Astronomical Observatory Institute > Faculty of Physics > >]
Jehin, Emmanuel mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Ferrais, Marin mailto [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 mailto [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 > >]
2018
Astronomy and Astrophysics
Springer
Yes (verified by ORBi)
International
0004-6361
1432-0746
Germany
[en] minor planets ; asteroids: individual: (89) Julia ; methods: observational ; methods: numerical
[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).
http://hdl.handle.net/2268/227308
10.1051/0004-6361/201833477

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