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El origen de la nebulosa solar (486958) Arrokoth, un binario de contacto primordial en el Cinturón de Kuiper
W B McKinnon1, D C Richardson2, J C Marohnic2
1Department of Earth and Planetary Sciences and McDonnell Center for the Space Sciences, Washington University in St. Louis, St. Louis, MO 63130, USA. mckinnon@wustl.edu.
Science (New York, N.Y.)
|February 15, 2020
Resumen
La misión New Horizons descubrió que Arrokoth, un objeto del Cinturón de Kuiper, se formó a partir de una fusión suave y de baja velocidad de cuerpos más pequeños en el Sistema Solar temprano. Su forma única revela conocimientos sobre los procesos de acreción planetesimal.
Área de la Ciencia:
- Ciencias planetarias
- Formación del sistema solar
- Objetos del Cinturón de Kuiper
Sus antecedentes:
- La nave espacial New Horizons visitó el frío objeto clásico del Cinturón de Kuiper (486958) Arrokoth (2014 MU69).
- Se observó que Arrokoth es un planetesimal binario de contacto, que presenta un rompecabezas de formación único.
Objetivo del estudio:
- Para investigar el mecanismo de formación de Arrokoth.
- Para entender los procesos de acreción en el sistema solar temprano usando Arrokoth como un estudio de caso.
Principales métodos:
- Análisis de los datos del encuentro de la nave New Horizons con Arrokoth.
- Modelado de escenarios de fusión de baja velocidad y colapso gravitacional de nubes de partículas.
Principales resultados:
- Arrokoth es el resultado de una fusión suave y de baja velocidad en el Sistema Solar temprano.
- Sus lóbulos lenticulares sugieren acreción dentro de una nube de partículas sólidas colapsadas gravitacionalmente.
- Los lóbulos binarios co-orbitantes del objeto probablemente se fusionaron debido a la pérdida de momento angular por fricción dinámica, colisiones o arrastre de gas.
Conclusiones:
- La forma binaria de contacto de Arrokoth se conservó debido a un entorno estable y de bajo impacto en el Cinturón de Kuiper clásico frío.
- El objeto proporciona información crucial sobre la acreción planetesimal y las condiciones del Sistema Solar temprano.
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