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Terminadores inhomogéneos en el exoplaneta WASP-39 b

Néstor Espinoza1,2, Maria E Steinrueck3,4, James Kirk5

  • 1Space Telescope Science Institute, Baltimore, MD, USA. nespinoza@stsci.edu.

Nature
|July 15, 2024
PubMed
Resumen
Este resumen es generado por máquina.

Los astrónomos utilizaron el Telescopio Espacial James Webb para capturar distintos espectros de transmisión por la mañana y por la noche del exoplaneta WASP-39 b. Esto revela que la atmósfera del planeta no es uniforme, con el lado de la tarde más caliente y más claro que el lado de la mañana.

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Área de la Ciencia:

  • Ciencias exoplanetarias
  • Física de la atmósfera
  • Espectroscopia

Sus antecedentes:

  • La espectroscopia de transmisión es una técnica clave para estudiar las atmósferas de los exoplanetas.
  • Una suposición común es la homogeneidad atmosférica, particularmente en la región del terminador.
  • Estudios anteriores sugirieron inhomogeneidad atmosférica en gigantes de gas caliente, pero faltaba evidencia espectral directa.

Objetivo del estudio:

  • Para investigar la inhomogeneidad atmosférica en el exoplaneta WASP-39 b.
  • Obtener y comparar los espectros de transmisión por la mañana y por la noche de WASP-39 b.
  • Para probar el supuesto de una región terminadora homogénea en las atmósferas de los exoplanetas.

Principales métodos:

  • Utilizando el Telescopio Espacial James Webb (JWST) para observaciones en el infrarrojo cercano.
  • Adquisición de espectros de transmisión de alta precisión de WASP-39 b durante los tránsitos.
  • Analizando los parámetros orbitales y comparando las características espectrales entre los terminadores de la mañana y la noche.

Principales resultados:

  • Detección de diferencias significativas entre los espectros de transmisión por la mañana y por la noche.
  • Se han observado mayores profundidades de tránsito en el terminador nocturno (405 ± 88 ppm más).
  • El terminador nocturno está modelado para ser más caliente que el terminador matutino en 177 K, con relaciones C / O solares.

Conclusiones:

  • El exoplaneta WASP-39 b exhibe una atmósfera no homogénea.
  • El terminador nocturno es más caliente, más claro y muestra características espectrales más grandes que el terminador matutino.
  • Los modelos generales de circulación apoyan estos hallazgos, indicando un lado nublado por la mañana y más claro por la tarde.