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系外惑星

27 件の記事

Retrograde orbit: the satellite (red) orbits in the direction opposite to the rotation of its primary (blue/black)

逆行運動のメカニズム天文学における回転と公転の不思議

逆行運動順行公転周期自転軸
At left, tidally locked, the Moon rotates at the same rate it orbits the Earth, keeping the same face toward the planet. At right, not tidally locked, if the Moon did not rotate then the face would change over the course of an orbit. Viewed from north; not to scale.

潮汐ロックの仕組みと宇宙における影響

潮汐ロック同期回転天文学
An elliptic, parabolic, and hyperbolic Kepler orbit: Elliptic (eccentricity = 0.7) Parabolic (eccentricity = 1) Hyperbolic orbit (eccentricity = 1.3)

軌道離心率天体の軌道形状を決定するメカニズム

軌道離心率ケプラー軌道天体力学楕円軌道
Artist's impression of a magnetosphere

磁気圏の仕組みと惑星保護のメカニズム

磁気圏太陽風地球磁場磁気圏界面
The internal structure of the inner planets.

惑星核の構造と進化地球から系外惑星まで

惑星核地球の核惑星分化ガス惑星
Under geophysical definitions of a planet, there are more satellite and dwarf planets in the Solar System than classical planets.

惑星の定義を再考する天文学的視点と地球物理学的アプローチの違い

惑星の定義IAU地球物理学的定義静水圧平衡
At left, tidally locked, the Moon rotates at the same rate it orbits the Earth, keeping the same face toward the planet. At right, not tidally locked, if the Moon did not rotate then the face would change over the course of an orbit. Viewed from north; not to scale.

潮汐ロックの仕組みと宇宙における影響

潮汐ロック同期回転天体力学
Gas giants lack a defined surface; the atmosphere becomes progressively denser closer to the core.

ガス巨星の正体木星・土星から系外惑星まで徹底解説

ガス巨星木星土星天王星
Cutaway illustrations of the interior of the giant planets. Jupiter is shown with a rocky core overlaid by a deep layer of metallic hydrogen.

巨大惑星の正体ガス巨星と氷巨星、そして未知の系外惑星たち

巨大惑星ガス巨星氷巨星木星
The eight planets of the Solar System with size to scale (up to down, left to right): Saturn, Jupiter, Uranus, Neptune (outer planets), Earth, Venus, Mars, and Mercury (inner planets)

惑星の定義と太陽系の構造天文学的視点から見る世界の成り立ち

惑星太陽系IAU定義準惑星
Number of extrasolar planet discoveries per year through 2022, with colors indicating method of detection: Direct imaging Microlensing Transit Radial velocity Timing

系外惑星の検出手法未知の世界を捉える天文学の技術

系外惑星検出手法トランジット法視線速度法
Artist conception of CoRoT-7b transiting yellow dwarf CoRoT-7

CoRoT-7b溶岩の海に覆われた「スーパーアース」の正体

CoRoT-7bスーパーアース系外惑星溶岩惑星