Collisional evolution of the trans-Neptunian region in an early dynamical instability scenario

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Title: Collisional evolution of the trans-Neptunian region in an early dynamical instability scenario
Authors: Benavídez, Paula Gabriela | Campo Bagatin, Adriano | Curry, Jacob | Alvarez-Candal, Alvaro | Vincent, Jean-Baptiste
Research Group/s: Astronomía y Astrofísica
Center, Department or Service: Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal | Universidad de Alicante. Instituto Universitario de Física Aplicada a las Ciencias y las Tecnologías
Keywords: Trans-Neptunian Objects | Kuiper belt | Collisional evolution | Dynamical instability
Knowledge Area: Física Aplicada
Issue Date: 13-Jun-2022
Publisher: Oxford University Press
Citation: Monthly Notices of the Royal Astronomical Society. 2022, 514(4): 4876-4893.
Abstract: Any early or late dynamical instability in the outer Solar System should have left their footprint on the trans-Neptunian object (TNO) populations. Here we study the collisional and dynamical evolution of such populations numerically by an updated version of ALICANDEP, which suitably takes into account the onset of an early dynamical instability. Key parameters for collisional and dynamical evolution are chosen to match results with current observables. The new model (ALICANDEP-22) considers an original region located between 22 and 30 au, containing 20 to 30 M⊕ from which bodies are either dynamically ejected from the region or implanted into the current plutinos and hot classical trans-Neptunian belt. An in–situ population of objects is also present since the beginning, corresponding to the current cold–classical population. Collisional and dynamical evolution is allowed starting from initial conditions accounting for streaming instability models and observational constraints. ALICANDEP-22 successfully reproduces observational constraints as well as the shape of the size-frequency distribution expected for the Trojan population. The model concludes that Arrokoth is likely a primordial body but cannot be conclusive on the origin of comet 67P/Churyumov–Gerasimenko. The current presence of bodies larger than Pluto in the outer TNO population –waiting to be discovered– is compatible with the initial distributions that allow the model to match current constraints.
Sponsor: PGB and ACB acknowledge funding by the Spanish Ministerio de Investigación, Ciencia e Innovación through project RTI2018-099464-B-I00 “Retos de la Sociedad” (2018 call). JC acknowledge the University of Surrey and its Physics department for giving him the opportunity that allowed him to stay at the University of Alicante (UA) and to collaborate to this work during part of 2020. AAC acknowledges UA grant UATALENTO18-02 and from the State Agency for Research of the Spanish MCIU through the “Center of Excellence Severo Ochoa” award to the Instituto de Astrofísica de Andalucía (SEV-2017-0709) We thank the International Space Science Institute (ISSI Bern), who supported the OCEOSS project where some of this work was discussed.
ISSN: 0035-8711 (Print) | 1365-2966 (Online)
DOI: 10.1093/mnras/stac1578
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2022 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
Peer Review: si
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Appears in Collections:INV - Astronomía y Astrofísica - Artículos de Revistas

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