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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2019

Homogeneous internal structure of CM-like asteroid (41) Daphne★★★

1 LAGRANGE - Joseph Louis LAGRANGE
2 IMCCE - Institut de Mécanique Céleste et de Calcul des Ephémérides
3 ARC - Astrophysics Research Centre [Belfast]
4 LAM - Laboratoire d'Astrophysique de Marseille
5 COMUE UCA - COMUE Université Côte d'Azur (2015-2019)
6 Department of Space Studies [Boulder]
7 GEOAZUR 7329 - Géoazur
8 University of Arizona
9 UAM - Uniwersytet im. Adama Mickiewicza w Poznaniu = Adam Mickiewicz University in Poznań
10 ZUT - West Pomeranian University of Technology in Szczecin
11 Astronomical Observatory [Poznan]
12 TUT - Tampere University of Technology [Tampere]
13 UK - Univerzita Karlova [Praha, Česká republika] = Charles University [Prague, Czech Republic]
14 SOR - Starfire Optical Range [AFRL]
15 SwRI - Southwest Research Institute [Boulder]
16 Binary Astronomy
17 ObsGE - Observatoire Astronomique de l'Université de Genève
18 CdR & CdL group - Courbes de rotation d'astéroïdes, de comètes et d'étoiles variables
19 UCA - Université Cadi Ayyad [Marrakech]
20 JPL - Jet Propulsion Laboratory
21 ESTEC - European Space Research and Technology Centre
22 DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
23 Astronomical Institute of Charles University
24 Observatoire du Bois de Bardon
25 STAR - Space Sciences, Technologies and Astrophysics Research Institute
26 DOTA, ONERA, Université Paris Saclay (COmUE) [Châtillon]
27 EMMAH - Environnement Méditerranéen et Modélisation des Agro-Hydrosystèmes
28 Institut d'Astrophysique et de Géophysique [Liège]
29 Department of Mathematics [Tampere]
30 MPIA - Max-Planck-Institut für Astronomie
31 Fundació Privada Observatori Esteve Duran
32 AMGen - Applied Molecular Genetics
33 CS3 - Center for Solar System Studies
34 Research and Scientific Support Department of ESA
35 ESO - European Southern Observatory [Santiago]
36 UDP - Universidad Diego Portales [Santiago - Chili]
B. Carry
M. Marsset
P. Vernazza
Eric Lagadec
  • Fonction : Auteur
  • PersonId : 958751
A. Fienga
A. Conrad
  • Fonction : Auteur
T. Santana-Ros
C. Dumas
L. Jorda
F. Marchis
P. Michel
P. Tanga
  • Fonction : Auteur
Arthur Vigan

Résumé

Context. CM-like asteroids (Ch and Cgh classes) are a major population within the broader C-complex, encompassing about 10% of the mass of the main asteroid belt. Their internal structure has been predicted to be homogeneous, based on their compositional similarity as inferred from spectroscopy and numerical modeling of their early thermal evolution.Aims. Here we aim to test this hypothesis by deriving the density of the CM-like asteroid (41) Daphne from detailed modeling of its shape and the orbit of its small satellite.Methods. We observed Daphne and its satellite within our imaging survey with the Very Large Telescope extreme adaptive-optics SPHERE/ZIMPOL camera and complemented this data set with earlier Keck/NIRC2 and VLT/NACO observations. We analyzed the dynamics of the satellite with our Genoid meta-heuristic algorithm. Combining our high-angular resolution images with optical lightcurves and stellar occultations, we determine the spin period, orientation, and 3D shape, using our ADAM shape modeling algorithm.Results. The satellite orbits Daphne on an equatorial, quasi-circular, prograde orbit, like the satellites of many other large main-belt asteroids. The shape model of Daphne reveals several large flat areas that could be large impact craters. The mass determined from this orbit combined with the volume computed from the shape model implies a density for Daphne of 1.77 ± 0.26 g cm−3 (3 σ). This densityis consistent with a primordial CM-like homogeneous internal structure with some level of macroporosity (≈ 17%).Conclusions. Based on our analysis of the density of Daphne and 75 other Ch/Cgh-type asteroids gathered from the literature, we conclude that the primordial internal structure of the CM parent bodies was homogeneous.
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Dates et versions

hal-02118038 , version 1 (21-08-2020)

Identifiants

Citer

B. Carry, F. Vachier, J. Berthier, M. Marsset, P. Vernazza, et al.. Homogeneous internal structure of CM-like asteroid (41) Daphne★★★. Astronomy and Astrophysics - A&A, 2019, 623, pp.A132. ⟨10.1051/0004-6361/201833898⟩. ⟨hal-02118038⟩
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