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In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. He formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe.
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In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. In 1909, he formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe. However, in 1918, he published his third law of planetary motion, which gives a precise mathematical relationship between a planet's average distance from the Sun and the amount of time it takes to revolve around the Sun. It...
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In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. His first law states that all planets orbit the Sun in an elliptical orbit, with the Sun at one of the ellipse's foci. Therefore, the distance of a planet from the Sun varies throughout its revolution around the Sun.
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Surface Mapping of Earth-like Exoplanets using Single Point Light Curves
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Planetas templados del tamaño de la Tierra que transitan por una estrella enana ultrafría cercana

Michaël Gillon1, Emmanuël Jehin1, Susan M Lederer2

  • 1Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 19C, 4000 Liège, Belgium.

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Los astrónomos descubrieron tres exoplanetas del tamaño de la Tierra orbitando una estrella enana ultrafría. Estos planetas, encontrados cerca de la estrella

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Área de la Ciencia:

  • Astronomía y astrofísica
  • Ciencia de los exoplanetas
  • Evolución estelar

Sus antecedentes:

  • Las enanas ultrafrías son objetos parecidos a estrellas con temperaturas por debajo de 2.700 grados Kelvin.
  • Comprenden el 15% de los objetos astronómicos del vecindario solar, incluidas las estrellas de baja masa y las enanas marrones.
  • La teoría de la acreción del núcleo predice una población significativa de planetas terrestres alrededor de estos objetos.

Objetivo del estudio:

  • Para buscar y caracterizar planetas terrestres que orbitan alrededor de estrellas enanas ultrafrías.
  • Para probar las predicciones de las teorías de formación de planetas alrededor de estrellas de baja masa.
  • Para investigar la habitabilidad potencial de los planetas en las zonas habitables de las enanas ultrafrías.

Principales métodos:

  • La astronomía observacional utiliza la fotometría de tránsito para detectar exoplanetas.
  • Análisis del brillo infrarrojo y el tamaño de la estrella enana anfitriona ultrafría.
  • Caracterización estelar para determinar los niveles de radiación planetaria.

Principales resultados:

  • Descubrimiento de tres planetas del tamaño de la Tierra que transitan por una estrella enana ultrafría a 12 parsecs de distancia.
  • Los planetas interiores reciben 4x y 2x la irradiación de la Tierra, cerca del borde interior de la zona habitable.
  • Se indica un tercer planeta con una radiación potencialmente más baja que la Tierra, con 11 posibles órbitas.

Conclusiones:

  • El descubrimiento confirma la existencia de planetas terrestres alrededor de enanas ultrafrías.
  • El sistema cercano ofrece una oportunidad única para la caracterización detallada de la atmósfera del exoplaneta.
  • Las enanas ultrafrías son objetivos prometedores en la búsqueda de exoplanetas potencialmente habitables.