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Kepler's First Law of Planetary Motion01:10

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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.
Polish astronomer Nikolaus Copernicus put forth a theory that stated a heliocentric model for the solar system. According to this heliocentric theory, all the planets, including Earth, orbit the Sun in circular orbits.
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Kepler's Second Law of Planetary Motion01:29

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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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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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Surface Mapping of Earth-like Exoplanets using Single Point Light Curves
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Un candidato a planeta terrestre en una órbita templada alrededor de Proxima Centauri

Guillem Anglada-Escudé1, Pedro J Amado2, John Barnes3

  • 1School of Physics and Astronomy, Queen Mary University of London, 327 Mile End Road, London E1 4NS, UK.

Nature
|August 26, 2016
PubMed
Resumen

Los astrónomos han descubierto un nuevo exoplaneta orbitando a Próxima Centauri, nuestro vecino estelar más cercano. Este planeta potencialmente habitable, Proxima b, tiene una masa mínima de 1.3 masas terrestres y orbita dentro de la zona habitable de la estrella.

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Área de la Ciencia:

  • Astronomía y astrofísica
  • Ciencias exoplanetarias
  • Física estelar

Sus antecedentes:

  • Proxima Centauri, la estrella enana roja más cercana al Sol, es ampliamente estudiada.
  • Las estrellas de baja masa como Proxima Centauri son comunes, lo que las convierte en objetivos clave para la búsqueda de exoplanetas.
  • Comprender los sistemas planetarios alrededor de estrellas cercanas es crucial para la planetología comparativa.

Objetivo del estudio:

  • Para detectar y caracterizar los exoplanetas que orbitan alrededor de Proxima Centauri.
  • Para determinar los parámetros orbitales y la masa mínima de un planeta recién descubierto.
  • Para evaluar la habitabilidad potencial del exoplaneta basado en su temperatura de equilibrio.

Principales métodos:

  • Utilizó datos de observación para detectar la presencia de un planeta.
  • Velocidad radial o datos de tránsito analizados para inferir el período orbital y el semieje mayor.
  • Calculó la masa mínima del exoplaneta basado en sus características orbitales.

Principales resultados:

  • Descubrimiento de un pequeño planeta, designado Proxima b, orbitando alrededor de Proxima Centauri.
  • El exoplaneta tiene una masa mínima de aproximadamente 1,3 masas terrestres.
  • Proxima b orbita su estrella cada 11,2 días a una distancia de 0,05 unidades astronómicas, con una temperatura de equilibrio adecuada para el agua líquida.

Conclusiones:

  • Proxima b es el exoplaneta conocido más cercano a la Tierra.
  • La ubicación del planeta dentro de la zona habitable sugiere el potencial de agua líquida en la superficie.
  • Este descubrimiento pone de relieve la posibilidad de encontrar planetas potencialmente habitables alrededor de estrellas cercanas de baja masa.