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Detección de exoplanetas. La actividad estelar enmascarada como planetas en la zona habitable de la enana M Gliese
Paul Robertson1, Suvrath Mahadevan2, Michael Endl3
1Department of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802, USA. Center for Exoplanets and Habitable Worlds, The Pennsylvania State University, University Park, PA 16802, USA. pmr19@psu.edu.
Science (New York, N.Y.)
|July 5, 2014
Resumen
El planeta GJ 581d, que anteriormente se creía que estaba en la zona habitable, probablemente no existe. El análisis de la actividad estelar sugiere que su señal es un artefacto, impactando la detección de otros exoplanetas como GJ 581g.
Área de la Ciencia:
- La astronomía y la astrofísica.
- Ciencia exoplanetaria Ciencia de los exoplanetas.
- La actividad estelar es la actividad estelar.
Sus antecedentes:
- Se creía que Gliese 581, una estrella enana M, albergaba cuatro planetas, con GJ 581d y GJ 581g considerados exoplanetas potenciales de zona habitable.
- La existencia y las características de GJ 581d y GJ 581g han sido objeto de debate, influenciados por suposiciones sobre la excentricidad orbital y la actividad estelar.
Objetivo del estudio:
- Reevaluar las señales planetarias alrededor de Gliese 581 mediante el análisis de la actividad estelar.
- Para determinar la verdadera naturaleza de la señal GJ 581d y su impacto en otros exoplanetas detectados.
Principales métodos:
- Análisis de la actividad estelar utilizando la línea Hα para medir el período de rotación de la estrella.
- Correlación de la modulación Hα con los datos de velocidad radial para identificar y corregir la contaminación estelar.
- Reanálisis de los datos de velocidad radial después de la corrección de actividad para evaluar las señales planetarias.
Principales resultados:
- Se midió un período de rotación estelar de 130 ± 2 días para Gliese 581.
- La corrección por actividad estelar disminuyó significativamente la señal de GJ 581d a 1.5 desviaciones estándar.
- El análisis reveló que GJ 581d es probablemente un artefacto de la actividad estelar, lo que también condujo a la falsa detección de GJ 581g.
Conclusiones:
- El exoplaneta GJ 581d no parece existir como una verdadera señal planetaria.
- La actividad estelar es un factor significativo que puede imitar o enmascarar las señales de los exoplanetas, lo que lleva a posibles malas interpretaciones.
- La corrección precisa de la actividad estelar es crucial para la detección y caracterización confiables de exoplanetas, particularmente alrededor de estrellas enanas M activas.
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