| Issue |
A&A
Volume 672, April 2023
|
|
|---|---|---|
| Article Number | A48 | |
| Number of page(s) | 12 | |
| Section | Planets and planetary systems | |
| DOI | https://doi.org/10.1051/0004-6361/202245538 | |
| Published online | 28 March 2023 | |
Deficit of primitive compositions in binary asteroids and pairs★
1
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange,
Bd de l’Observatoire, CS 34229,
06304
Nice Cedex 4,
France
e-mail: kate.minker@oca.eu
2
MAUCA – Master track in Astrophysics, Université Côte d’Azur & Observatoire de la Côte d’Azur,
Parc Valrose,
06100
Nice,
France
Received:
23
November
2022
Accepted:
4
February
2023
Context. Small binary asteroid systems and pairs are thought to form through fission induced by spin up via the Yarkovsky-O’Keefe-Radzievskii-Paddack (YORP) effect. This process is expected to depend on their structural strength and therefore composition.
Aims. We aim to determine how taxonomic classes – used as a proxy for composition – are distributed amongst binary asteroids and asteroid pairs compared to the general population.
Methods. We compared the distribution of taxonomic classes of binary systems and pairs with that of a reference sample of asteroids. We built this sample by selecting asteroids in a way that reproduces the orbital and size distribution of the binaries and pairs. We did this in order to minimize potential biases between samples.
Results. A strong deficit of primitive compositions (C, B, P, D types) among binary asteroids and asteroid pairs is identified, as well as a strong excess of asteroids with mafic-silicate-rich surface compositions (S, Q, V, A types).
Conclusions. Amongst low-mass, rapidly rotating asteroids, those with mafic-silicate-rich compositions are more likely to form multiple asteroid systems than their primitive counterparts.
Key words: minor planets, asteroids: general / methods: statistical
The catalogs of properties are only available at the CDS via anonymous ftp to cdsarc.cds.unistra.fr (130.79.128.5) or via https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/672/A48
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
This article is published in open access under the Subscribe to Open model. Subscribe to A&A to support open access publication.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.