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Agua en la zona de formación de planetas terrestres del disco PDS 70

G Perotti¹, V Christiaens², Th Henning³

¹Max Planck Institute for Astronomy, Heidelberg, Germany. perotti@mpia.de.

|July 24, 2023

Resumen

Se ha detectado agua en el disco interno del sistema PDS 70 utilizando observaciones JWST. Este hallazgo sugiere que los planetas terrestres que se forman allí tienen acceso al agua, potencialmente formados in situ.

Área de la Ciencia:

Ciencias planetarias
La astrofísica
Astroquímica

Sus antecedentes:

Los planetas terrestres y subneptunianos se forman en los discos protoplanetarios interiores (<10 UA).
El papel del agua en la formación del planeta es crucial, pero su origen (in situ vs. transporte) se debate.
Las observaciones anteriores (Spitzer) solo proporcionaron límites superiores para el agua en los discos internos.

Objetivo del estudio:

Para buscar agua en el disco interno del sistema PDS 70 utilizando JWST.
Investigar el origen y la disponibilidad de agua para la formación de planetas terrestres en los discos internos.
Comprender los procesos químicos y la dinámica del disco que influyen en la presencia de agua.

Principales métodos:

Utilizó las observaciones del Telescopio Espacial James Webb (JWST) del disco protoplanetario PDS 70.
Analizó la distribución de energía espectral del infrarrojo medio para detectar especies moleculares.
Densidades de la columna de vapor de agua medidas y emisión de dióxido de carbono observada.

Principales resultados:

Confirmamos la presencia de agua en el disco interior del PDS 70.
Las densidades de la columna de agua sugieren la formación in situ a través de reacciones de O, H2 y/o OH, sobreviviendo al auto blindaje.
La emisión de CO2 observada apoya la formación in situ y la resistencia a la fotodisociación UV; la variable SED indica un cambio en la geometría del disco interior.

Conclusiones:

La formación de planetas terrestres en el disco interno PDS 70 tiene acceso a un depósito de agua.
Se apoya la formación de agua in situ, potencialmente ayudada por el blindaje del polvo y la reposición del disco externo.
La distribución de energía espectral variable sugiere cambios dinámicos en la geometría del disco interno.

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