Hidrocarburos abundantes en el disco alrededor de una estrella de muy baja masa
A M Arabhavi1, I Kamp1, Th Henning2
1Kapteyn Astronomical Institute, University of Groningen, Groningen 9700 AV, Netherlands.
Science (New York, N.Y.)
|June 6, 2024
Resumen
Las estrellas de muy baja masa con frecuencia albergan planetas. Las observaciones del Telescopio Espacial James Webb revelan un disco rico en carbono alrededor de una estrella joven, lo que sugiere que los planetas terrestres que se forman allí pueden tener composiciones únicas debido a los abundantes hidrocarburos.
Área de la Ciencia:
- La astronomía
- Ciencias exoplanetarias
- Astroquímica
Sus antecedentes:
- Las estrellas de muy baja masa (estrellas VLM) se encuentran cada vez más para albergar planetas terrestres.
- La composición química de los discos formadores de planetas influye en la composición masiva de los planetas resultantes.
- Comprender la química del disco es crucial para predecir las propiedades del planeta.
Objetivo del estudio:
- Para investigar la composición química del disco formador de planetas alrededor de la estrella de muy baja masa ISO-ChaI 147.
- Para determinar la abundancia de moléculas de carbono en el disco interno.
- Para inferir las implicaciones para la formación de planetas alrededor de las estrellas VLM.
Principales métodos:
- Utilizó la espectroscopia de infrarrojo medio del Telescopio Espacial James Webb (JWST).
- Analizado el espectro de emisión del disco protoplanetario alrededor de ISO-ChaI 147.
- Moléculas identificadas y cuantificadas que contienen carbono, incluidos el etano y el benceno.
Principales resultados:
- El disco interno de ISO-ChaI 147 exhibe una química rica en carbono.
- Se detectó la emisión de 13 moléculas distintas que contienen carbono.
- Se observaron altas densidades de columnas de hidrocarburos, sondeando profundamente en el disco.
- Se determinó una alta relación carbono-oxígeno.
Conclusiones:
- La química del disco interno rico en carbono sugiere condiciones específicas para la formación de planetas alrededor de las estrellas VLM.
- La alta relación carbono-oxígeno indica un transporte radial significativo de material dentro del disco.
- Estos hallazgos predicen que los planetas que se forman en tales discos pueden tener distintas composiciones masivas, potencialmente ricas en carbono.
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