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Kepler's First Law of Planetary Motion01:10

Kepler's First Law of Planetary Motion

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.
On the other hand,...
Kepler's Second Law of Planetary Motion01:29

Kepler's Second Law of Planetary Motion

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.
While in an elliptical orbit, the total energy of the planet is conserved. Therefore, the planet slows down when it is at apogee and...
Kepler's Third Law of Planetary Motion01:18

Kepler's Third Law of Planetary Motion

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Circular Orbits and Critical Velocity for Satellites01:16

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The Moon orbits around the Earth. In turn, the Earth (and other planets) orbit the Sun. The space directly above our atmosphere is filled with artificial satellites in orbit. One can examine the circular orbit, the simplest kind of orbit, to understand the relationship between the speed and the period of planets and satellites with respect to their positions and the bodies that they orbit.
Nicolaus Copernicus (1473-1543) first suggested that the Earth and all other planets orbit the Sun in...
Acceleration due to Gravity on Other Planets01:24

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No object with a finite mass can travel faster than the speed of light in a vacuum. This fact has an interesting consequence in the domain of extremely high gravitational fields.
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Surface Mapping of Earth-like Exoplanets using Single Point Light Curves
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Kepler-16: un planeta circumbinario en tránsito.

Laurance R Doyle1, Joshua A Carter, Daniel C Fabrycky

  • 1Carl Sagan Center for the Study of Life in the Universe, SETI Institute, 189 Bernardo Avenue, Mountain View, CA 94043, USA. ldoyle@seti.org

Science (New York, N.Y.)
|September 17, 2011
PubMed
Resumen
Este resumen es generado por máquina.

Los astrónomos descubrieron un planeta similar a Saturno que orbita alrededor de dos estrellas, un planeta circumbinario. Los datos de la nave espacial Kepler determinaron con precisión las dimensiones del planeta y sus estrellas anfitrionas.

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Área de la Ciencia:

  • * Ciencias Exoplanetarias Ciencias Exoplanetarias
  • * La astrofísica estelar
  • * Formación planetaria de las estrellas

Sus antecedentes:

  • * La nave espacial Kepler ha proporcionado extensos datos sobre los exoplanetas.
  • * La comprensión de los sistemas planetarios alrededor de estrellas binarias es crucial para la diversidad de exoplanetas.
  • * Los planetas circumbinarios ofrecen una visión única de los mecanismos de formación de los planetas.

Objetivo del estudio:

  • * Informar de la detección de un planeta que orbita alrededor de un sistema estelar binario.
  • * Para determinar con precisión los parámetros físicos y orbitales del planeta y sus estrellas anfitrionas.
  • * Para investigar el entorno de formación de los planetas circumbinarios.

Principales métodos:

  • * Análisis de los datos de fotometría de tránsito de la nave espacial Kepler.
  • * Observación tanto de tránsitos planetarios como de eclipses estelares mutuos.
  • * Determinación precisa de las masas estelares y planetarias, radios y parámetros orbitales.

Principales resultados:

  • * Detección de un planeta circumbinario con masa y tamaño similares a los de Saturno.
  • * El planeta orbita sus estrellas anfitrionas en un período casi circular de 229 días.
  • * Las estrellas anfitrionas son de baja masa (0,20 y 0,69 masas solares) con una órbita excéntrica de 41 días.
  • * Los tres cuerpos exhiben un movimiento coplanar, confinado dentro de 0,5°.

Conclusiones:

  • * El planeta detectado es un planeta circumbinario, que orbita alrededor de dos estrellas.
  • * El movimiento coplanar sugiere que el planeta probablemente se formó dentro de un disco circumbinario.
  • * Este descubrimiento proporciona datos valiosos para comprender la formación de planetas en sistemas binarios.