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Un planeta gigante que transita por una protoestrella de 3 Myr con un disco desalineado
Madyson G Barber1, Andrew W Mann2, Andrew Vanderburg3
1Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA. madysonb@live.unc.edu.
Nature
|November 20, 2024
Resumen
Los astrónomos descubrieron un planeta en tránsito alrededor de una joven estrella de 3 millones de años. Este hallazgo ofrece información sobre la formación temprana de planetas y el potencial para observar planetas en discos de transición.
Área de la Ciencia:
- Ciencias exoplanetarias
- Astronomía estelar y galáctica
Sus antecedentes:
- Se conocen planetas en tránsito alrededor de estrellas jóvenes (10-40 millones de años), pero los planetas alrededor de estrellas más jóvenes (<10 millones de años) han sido escurridizos.
- Las razones potenciales para la elusividad incluyen la formación incompleta de planetas o vistas oscurecidas por discos protoplanetarios.
- Los discos externos deformados o rotos pueden permitir la visibilidad del planeta en tránsito si los discos internos se agotan.
Objetivo del estudio:
- Para informar sobre el descubrimiento y la caracterización de un planeta en tránsito alrededor de una estrella muy joven de la secuencia pre-principal.
- Investigar el potencial para la observación de planetas en sistemas con discos desalineados.
Principales métodos:
- Observaciones fotométricas para detectar los tránsitos.
- Las mediciones de velocidad radial para restringir la masa del planeta.
- Análisis de las propiedades estelares y la inclinación del disco.
Principales resultados:
- Descubrimiento del planeta en tránsito IRAS 04125+2902 b orbitando una estrella de 3 millones de años.
- El planeta tiene un período de 8,83 días y un radio de 10,7 radios terrestres.
- Se determinó un límite de masa superior de confianza del 95% de 90 masas terrestres, lo que sugiere que podría ser un precursor de una súper-Tierra o sub-Neptuno.
Conclusiones:
- Este descubrimiento demuestra la posibilidad de encontrar planetas en tránsito alrededor de estrellas muy jóvenes.
- El planeta IRAS 04125+2902 b puede representar una etapa temprana en la formación de super-Tierras y sub-Neptunos.
- El sistema exhibe una desalineación disco-estrella, cuyo origen requiere más investigación.
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