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Un planeta del tamaño de la Tierra con una densidad similar a la de la Tierra
Francesco Pepe1, Andrew Collier Cameron, David W Latham
1Observatoire Astronomique de l'Université de Genève, 51 chemin des Maillettes, 1290 Versoix, Switzerland.
Nature
|November 1, 2013
Resumen
Kepler-78b, un exoplaneta del tamaño de la Tierra, tiene una densidad similar a la de la Tierra, lo que sugiere una composición rocosa y de hierro. Este hallazgo ayuda a determinar la composición de los pequeños exoplanetas descubiertos por la nave espacial Kepler.
Área de la Ciencia:
- Ciencia exoplanetaria Ciencia de los exoplanetas.
- Geología planetaria Geología planetaria.
Sus antecedentes:
- Miles de exoplanetas del tamaño de la Tierra han sido detectados por la nave espacial Kepler de la NASA.
- La composición masiva de estos exoplanetas sigue siendo en gran medida desconocida debido a los desafíos de determinación de la masa.
Objetivo del estudio:
- Para determinar la masa y la densidad del exoplaneta del tamaño de la Tierra Kepler-78b.
- Para inferir la composición masiva de Kepler-78b y compararla con la Tierra.
Principales métodos:
- Se utilizaron datos de fotometría de tránsito de la nave espacial Kepler para identificar a Kepler-78b.
- Empleó mediciones de velocidad radial para determinar la masa de Kepler-78b.
Principales resultados:
- Kepler-78b tiene un radio de 1,16 veces el de la Tierra.
- Se determinó que la masa de Kepler-78b es de 1,86 masas terrestres.
- Kepler-78b exhibe una densidad media de 5,57 g cm-3, comparable a la densidad de la Tierra.
Conclusiones:
- Es probable que Kepler-78b esté compuesto principalmente de hierro y roca, similar a la Tierra.
- Este estudio proporciona datos cruciales para comprender la composición de los exoplanetas del tamaño de la Tierra.
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