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関連する概念動画

Kepler's First Law of Planetary Motion01:10

Kepler's First Law of Planetary Motion

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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.
On the other hand,...
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Reduced Mass Coordinates: Isolated Two-body Problem01:12

Reduced Mass Coordinates: Isolated Two-body Problem

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In classical mechanics, the two-body problem is one of the fundamental problems describing the motion of two interacting bodies under gravity or any other central force. When considering the motion of two bodies, one of the most important concepts is the reduced mass coordinates, a quantity that allows the two-body problem to be solved like a single-body problem. In these circumstances, it is assumed that a single body with reduced mass revolves around another body fixed in a position with an...
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Kepler's Second Law of Planetary Motion01:29

Kepler's Second Law of Planetary Motion

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

Kepler's Third Law of Planetary Motion

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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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Acceleration due to Gravity on Other Planets01:24

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The gravitational acceleration of an object near the Earth's surface is called the acceleration due to gravity. It can be measured by conducting simple experiments on Earth. However, such an experiment is impossible to conduct on the surface of other planets.
Astronomical observations are thus used to measure the acceleration due to gravity on other planets. This can be determined by observing the effect of a planet's gravity on objects close to it. The crucial factor that helps in this...
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Surface Mapping of Earth-like Exoplanets using Single Point Light Curves
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多惑星系における恒星のスピン軌道不整合

Daniel Huber1, Joshua A Carter, Mauro Barbieri

  • 1NASA Ames Research Center, MS 244-30, Moffett Field, CA 94035, USA.

Science (New York, N.Y.)
|October 19, 2013
PubMed
まとめ
この要約は機械生成です。

スピン・軌道不整合は,熱い木星系に特有するものではありません. 惑星地震学は,2つの惑星を持つ赤い巨人ケプラー-56の大きな傾斜を明らかにし,より広い惑星系構成で不整列が発生することを示しました.

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科学分野:

  • 外惑星科学とは,外惑星科学のこと.
  • 星の天体物理学 星の天体物理学
  • アステロシズモロジーの地震学

背景:

  • 熱い木星を持つ星は,しばしば高い傾斜を示し,その形成の動的混乱を示唆します.
  • 複数の共平面惑星を持つ星は,通常,低い傾きを示し,ディスクの移動を暗示します.
  • ケプラー56は赤い巨星で,既知の2つのコプラナー惑星が通過している.

研究 の 目的:

  • 熱い木星を持つ惑星系を超えた惑星系におけるスピン軌道並びを調査する.
  • 赤い巨人ケプラー56の傾きを決定する.
  • 広い軌道に乗っている伴侶が不整列を誘発する可能性があるという仮説を検証するために.

主な方法:

  • アステロ地震学は,ケプラー56の恒星の傾きを正確に測定するために使用されました.
  • 2つの既知の惑星のケプラー通過データの分析.
  • 追加の同伴者を探すために,放射速度測定が行われました.

主要な成果:

  • ケプラー56は大きな傾きを持つことが判明し,熱い木星系と低傾き系との二分法に挑戦しました.
  • この研究は,スピン軌道不整列が,熱い木星系外惑星系に限ったことではないことを示しています.
  • ケプラー-56系では,放射速度経由で第三の,広い軌道に乗っている同伴星が検出されました.

結論:

  • スピン・オービットの不整列は,ホット・ジュピターだけでなく,複数の共平面惑星を持つシステムでも起こり得る.
  • 広い軌道に乗っている同伴者の存在は,大きな傾斜を誘発する妥当なメカニズムを提供します.
  • この発見は,惑星系形成と進化の経路の理解を広げています.