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Un planeta supermasivo del tamaño de Neptuno

Luca Naponiello1,2,3,4, Luigi Mancini5,6,7, Alessandro Sozzetti6

  • 1Department of Physics, University of Rome "Tor Vergata", Rome, Italy. lnaponiello@roma2.infn.it.

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|August 30, 2023
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Resumen
Este resumen es generado por máquina.

El denso exoplaneta del tamaño de Neptuno TOI-1853 b, encontrado en el desierto de Neptuno caliente, desafía las teorías de formación con su alta masa y densidad. Su composición inusual puede ser el resultado de colisiones planetarias o migración hacia el interior.

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Área de la Ciencia:

  • Ciencias exoplanetarias
  • Formación y evolución de los planetas
  • La astrofísica

Sus antecedentes:

  • Los planetas del tamaño de Neptuno muestran diversas composiciones y densidades, influenciadas por la ubicación de la formación y el escape atmosférico.
  • Estos planetas van desde mundos ricos en hidrógeno y baja densidad hasta planetas más densos con agua o interiores rocosos.
  • El 'desierto de Neptuno caliente' es una región cerca de las estrellas con una escasez de planetas del tamaño de Neptuno, que ofrece pistas sobre la evolución del sistema planetario.

Objetivo del estudio:

  • Para reportar el descubrimiento y la caracterización del exoplaneta en tránsito TOI-1853 b.
  • Investigar las propiedades inusuales de TOI-1853 b y sus implicaciones para las teorías de formación planetaria.
  • Para entender la formación y las vías evolutivas de los planetas dentro del desierto de Neptuno caliente.

Principales métodos:

  • Observaciones del planeta en tránsito TOI-1853 b utilizando la fotometría de tránsito.
  • Determinación del radio del planeta (3,46 ± 0,08 radios de la Tierra) y el período orbital (1,24 días).
  • Medición de la masa del planeta (73,2 ± 2,7 masas terrestres) y cálculo de su densidad (9,7 ± 0,8 g/cm3).

Principales resultados:

  • TOI-1853 b es un planeta del tamaño de Neptuno con una masa casi el doble que los planetas previamente conocidos en su clase de tamaño.
  • La alta densidad del planeta sugiere una composición dominada por elementos pesados, a diferencia de los planetas típicos del tamaño de Neptuno.
  • Su ubicación dentro del desierto de Neptuno caliente y la densidad extrema presentan un rompecabezas significativo para los modelos actuales.

Conclusiones:

  • Las propiedades de TOI-1853 b desafían las teorías convencionales de formación y evolución planetaria.
  • Su existencia puede explicarse por múltiples colisiones de protoplanetas de alta energía.
  • Alternativamente, podría representar el estado final de un planeta altamente excéntrico que migró hacia adentro hacia su estrella anfitriona.