Collisional evolution of the trans-Neptunian region in an early dynamical instability scenario
| Autor: | Paula G Benavidez, Adriano Campo Bagatin, Jacob Curry, Álvaro Álvarez-Candal, Jean-Baptiste Vincent |
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| Přispěvatelé: | 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, Astronomía y Astrofísica, Ministerio de Ciencia e Innovación (España), European Commission |
| Rok vydání: | 2022 |
| Předmět: |
Methods: numerical
Astronomy and Astrophysics planet-disc interactions Trans-Neptunian Objects asteroids: general Kuiper belt Minor planets asteroids: general Space and Planetary Science Física Aplicada Planet–disc interactions Collisional evolution minor planets Kuiper belt objects: general Dynamical instability |
| Zdroj: | RUA. Repositorio Institucional de la Universidad de Alicante Universidad de Alicante (UA) |
| Popis: | 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 20–30 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. © 2022 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. 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. |
| Databáze: | OpenAIRE |
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