Volume 643, November 2020
|Number of page(s)||16|
|Section||Planets and planetary systems|
|Published online||10 November 2020|
A comparative analysis of the outer-belt primitive families
Florida Space Institute, University of Central Florida,
2 Instituto de Astrofísica de Canarias, C/Vía Láctea s/n, 38205 La Laguna, Spain
3 Universidad de La Laguna (ULL), 38205 La Laguna, Spain
4 Fundación Galileo Galilei – INAF, Rambla José Ana Fernández Pérez, 7, 38712 Breña Baja, Santa Cruz de Tenerife, Spain
5 Departamento de Astrofísica, Observatório Nacional, Rio de Janeiro 20921-400, Brazil
6 Department of Physics, University of Central Florida, Florida, USA
7 Faculty of Natural Sciences, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway
Accepted: 24 August 2020
Context. Asteroid families are witnesses to the intense collisional evolution that occurred on the asteroid belt. The study of the physical properties of family members can provide important information about the state of differentiation of the parent body and provide insights into how these objects were formed. Several of these asteroid families identified across the main belt are dominated by low-albedo, primitive asteroids. These objects are important for the study of Solar System formation because they were subject to weaker thermophysical processing and provide information about the early conditions of our planetary system.
Aims. We aim to study the diversity of physical properties among the Themis, Hygiea, Ursula, Veritas, and Lixiaohua families.
Methods. We present new spectroscopic data, combined with a comprehensive analysis using a variety of data available in the literature, such as albedo and rotational properties.
Results. Our results show that Themis and Hygiea families, the largest families in the region, present similar levels of hydration. Ursula and Lixiaohua families are redder in comparison to the others and present no sign of hydrated members based on the analysis of visible spectra. Conversely, Veritas presents the highest fraction of hydrated members.
Conclusions. This work demonstrates a diverse scenario in terms of the physical properties of primitive outer-belt families, which could be associated with dynamical mixing of asteroid populations and the level of differentiation of the parental body.
Key words: minor planets, asteroids: general
© ESO 2020
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