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Emisión térmica del exoplaneta del tamaño de la Tierra TRAPPIST-1 b utilizando el JWST
Thomas P Greene1, Taylor J Bell2,3, Elsa Ducrot4
1Space Science and Astrobiology Division, NASA Ames Research Center, Moffett Field, CA, USA. tom.greene@nasa.gov.
Nature
|March 27, 2023
Resumen
El Telescopio Espacial James Webb observó el exoplaneta TRAPPIST-1 b, encontrando que su lado diurno vuelve a irradiar el calor estelar. Esto sugiere que TRAPPIST-1 b probablemente carece de una atmósfera sustancial para redistribuir el calor.
Área de la Ciencia:
- Ciencias exoplanetarias
- La astrofísica
- Ciencias planetarias
Sus antecedentes:
- El sistema TRAPPIST-1 alberga siete planetas del tamaño de la Tierra que orbitan alrededor de una estrella enana M.
- Las observaciones anteriores con los telescopios espaciales Hubble y Spitzer no han detectado características atmosféricas en estos planetas.
- TRAPPIST-1 b recibe una alta radiación estelar, por lo que su emisión térmica es un objetivo para el estudio.
Objetivo del estudio:
- Para medir la emisión térmica del exoplaneta TRAPPIST-1 b.
- Investigar la presencia y las características de una atmósfera en TRAPPIST-1 b.
- Para restringir la redistribución de calor en el exoplaneta.
Principales métodos:
- Observaciones fotométricas del eclipse secundario de TRAPPIST-1 b.
- Utilizó el filtro F1500W del instrumento de infrarrojo medio (MIRI) del telescopio espacial James Webb.
- Datos combinados de cinco observaciones separadas para lograr una detección de alta confianza.
Principales resultados:
- Se detectaron eclipses secundarios de TRAPPIST-1 b con una confianza de 8,7σ.
- Las mediciones indican que la radiación de calor proviene principalmente del hemisferio diurno del planeta.
- No se detectó ninguna absorción atmosférica significativa de dióxido de carbono (CO2) u otras especies.
Conclusiones:
- TRAPPIST-1b muestra poca o ninguna evidencia de una atmósfera capaz de redistribuir el calor estelar.
- La emisión térmica del exoplaneta es consistente con la re-radiación diurna.
- La caracterización atmosférica adicional de TRAPPIST-1 b está limitada por estos hallazgos.
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