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La identificación de una familia primordial de asteroides limita la población planetesimal original
Marco Delbo'1, Kevin Walsh2, Bryce Bolin3
1Université Côte d'Azur, CNRS-Lagrange, Observatoire de la Côte d'Azur, CS 34229-F 06304 Nice Cedex 4, France. delbo@oca.eu.
Science (New York, N.Y.)
|August 5, 2017
Resumen
Los científicos descubrieron una familia de asteroides de hace 4 mil millones de años, revelando planetesimales originales de más de 35 km. Este hallazgo ayuda a comprender los orígenes de los asteroides y la distribución del tamaño planetario del sistema solar temprano.
Área de la Ciencia:
- Ciencia de los asteroides
- Formación planetaria
- Evolución del sistema solar
Sus antecedentes:
- Las familias de asteroides son fragmentos de impacto de los cuerpos padres.
- Comprender los orígenes de los asteroides limita la distribución del tamaño planetario.
- La mayoría de los asteroides oscuros no están vinculados a las familias conocidas de asteroides.
Objetivo del estudio:
- Identificar a los miembros de las familias de asteroides no descubiertos.
- Determinar la distribución del tamaño de los planetesimales originales.
- Restringir una fase crítica de la formación planetaria.
Principales métodos:
- Análisis de los datos de población de asteroides.
- Descubrimiento de una nueva y antigua familia de asteroides.
- Conectando a los asteroides oscuros con esta nueva familia.
Principales resultados:
- Una familia de asteroides de 4 mil millones de años de antigüedad fue descubierta en el cinturón principal interior.
- Esta familia incluye la mayoría de los asteroides oscuros no vinculados anteriormente.
- Los planetesimales originales identificados son todos más grandes que 35 km.
Conclusiones:
- Los asteroides nacieron grandes, apoyando la hipótesis 'nacido grande'.
- El número de planetesimales identificados coincide con los cuerpos progenitores conocidos de los meteoritos.
- Este descubrimiento revela una distribución de tamaño planetario previamente desconocida.
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