Academic Journal
The impact crater at the origin of the Julia family detected with VLT/SPHERE?
| العنوان: | The impact crater at the origin of the Julia family detected with VLT/SPHERE? |
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| المؤلفون: | Vernazza, Pierre, Brož, Miroslav, Drouard, Alexis, Hanuš, Josef, Viikinkoski, Matti, Marsset, Michael, Jorda, Laurent, Fetick, Romain, Carry, Benoît, Marchis, Franck, Birlan, Mirel, Fusco, Thierry, Santana-Ros, Toni, Podlewska-Gaca, Edyta, Jehin, Emmanuël, Ferrais, Marin, Bartczak, Przemyslław, Dudziński, Grzegorz, Berthier, Jérôme, Castillo-Rogez, Julie, Cipriani, Fabrice, Colas, François, Dumas, Christophe, Ďurech, Josef, Kaasalainen, Mikko, Kryszczynska, Agnieszka, Lamy, Philippe, Le Coroller, Hervé, Marciniak, Anna, Michalowski, Tadeusz, Michel, Patrick, Pajuelo, Myriam, Tanga, Paolo, Vachier, Frédéric, Vigan, Arthur, Warner, Brian, Witasse, Oliver, Yang, Bin, Asphaug, Erik, Richardson, Derek C., Ševeček, Pavel, Gillon, Michael, Benkhaldoun, Zouhair |
| المساهمون: | Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS), Astronomical Institute of Charles University, Univerzita Karlova Praha, Česká republika = Charles University Prague, Czech Republic (UK), Department of Mathematics Tampere, Tampere University of Technology Tampere (TUT), Astrophysics Research Centre Belfast (ARC), Queen's University Belfast (QUB), Joseph Louis LAGRANGE (LAGRANGE), Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UniCA)-Université Côte d'Azur (UniCA)-Centre National de la Recherche Scientifique (CNRS), Search for Extraterrestrial Intelligence Institute (SETI), Institut de Mécanique Céleste et de Calcul des Ephémérides (IMCCE), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Centre National de la Recherche Scientifique (CNRS)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Sciences et Lettres (PSL)-Université de Lille-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), DOTA, ONERA, Université Paris Saclay (COmUE) Châtillon, ONERA-Université Paris Saclay (COmUE), Astronomical Observatory Poznan, Uniwersytet im. Adama Mickiewicza w Poznaniu = Adam Mickiewicz University in Poznań (UAM), University of Szczecin, Institut d'Astrophysique et de Géophysique Liège, Université de Liège, Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), European Space Research and Technology Centre (ESTEC), Agence Spatiale Européenne = European Space Agency (ESA), TMT International Observatory, Observatoire de la Côte d'Azur (OCA), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Pontificia Universidad Católica del Perú = Pontifical Catholic University of Peru (PUCP), Center for Solar System Studies (CS3), European Southern Observatory Santiago (ESO), European Southern Observatory (ESO), ASU School of Earth and Space Exploration (SESE), Arizona State University Tempe (ASU), University of Maryland College Park, University of Maryland System, Université Cadi Ayyad Marrakech (UCA) |
| المصدر: | ISSN: 0004-6361. |
| بيانات النشر: | CCSD EDP Sciences |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | methods: numerical, methods: observational, techniques: high angular resolution, minor planets, asteroids: individual: (89) Julia, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
| الوصف: | International audience ; 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 accurately constrain 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, via several complementary approaches, we evaluated the recently proposed hypothesis that the 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, 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 and the size of the impact crater at its origin. Finally, we utilized the images/3D shape in an attempt to identify 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 30–120 Myrs ago by a D ~ 8 km 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 to be the origin of the family.Conclusions. New doors into ground-based asteroid ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | BIBCODE: 2018A&A.618A.154V |
| DOI: | 10.1051/0004-6361/201833477 |
| الاتاحة: | https://hal.science/hal-02118106 https://hal.science/hal-02118106v1/document https://hal.science/hal-02118106v1/file/aa33477-18.pdf https://doi.org/10.1051/0004-6361/201833477 |
| Rights: | info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.1460EE8C |
| قاعدة البيانات: | BASE |
| DOI: | 10.1051/0004-6361/201833477 |
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