相关实验视频
Updated: Apr 30, 2026

14:57
Structural Design and Manufacturing of a Cruiser Class Solar Vehicle
Published on: January 30, 2019
14.7K
太阳系外行星HD 209458b的轨道运动,绝对质量和高空风
Ignas A G Snellen1, Remco J de Kok, Ernst J W de Mooij
1Leiden Observatory, Leiden University, Postbus 9513, 2300 RA Leiden, The Netherlands. snellen@strw.leidenuniv.nl
Nature
|June 26, 2010
概括
研究人员使用光谱仪测量了系外行星HD 209458b在过境期间的质量. 他们检测到大气中的一氧化碳,揭示了风,并确认其质量为0.64 +/- 0.09木星质量.
科学领域:
- 外系行星科学 外系行星科学
- 大气物理学 大气物理学
- 恒星天文学 恒星天文学
背景情况:
- 太阳系外行星质量估计通常依赖于主星通过辐射速度的表征.
- 确定行星的轨道速度对于使用引力定律准确计算质量至关重要.
- 以前的方法缺乏对系外行星大气动态的直接测量.
研究的目的:
- 用光谱学方法描述过境期间的系外行星HD 209458b的大气层.
- 通过测量其轨道速度来确定HD 209458b的质量.
- 为了研究大气动力学,特别是风力模式,在HD 209458b.
主要方法:
- 在系外行星过境期间的高分散地面光谱学.
- 对地球大气中一氧化碳吸收线波长变化的分析.
- 用牛顿引力定律来确定质量的应用.
主要成果:
- 观察到一氧化碳吸收线的显著波长转移,表明行星的辐射速度发生了变化.
- 主体恒星的质量被确定为1.00 +/- 0.22 M (太阳).
- 据计算,系外行星HD 209458b的质量为0.64 +/- 0.09 M(Jup).
- 在一氧化碳信号中,蓝变速约为2公里/秒,表明风从白天流向夜晚.
- 高层大气中的一氧化碳混合比率估计为 (1-3) x 10(-3).
结论:
- 该研究通过直接大气观测成功确定了系外行星HD 209458b的质量.
- 在HD 209458b上发现了强烈大气风的证据,从被辐射的白天侧流向夜晚侧.
- 这些发现提供了有关系外行星大气组成和动态的见解.
相关概念视频
Non-uniform Circular Motion
7.7K
In uniform circular motion, the particle executing circular motion has a constant speed, and the circle is at a fixed radius. However, not all circular motion occurs at a constant speed. A particle can travel in a circle and speed up or slow down, showing an acceleration in the direction of motion. In that case, the motion is called non-uniform circular motion, and an additional acceleration is introduced, which is in the direction tangential to the circle.
For example, such...
For example, such...
7.7K
Acceleration due to Gravity on Other Planets
3.4K
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...
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...
3.4K
Circular Orbits and Critical Velocity for Satellites
2.9K
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...
Nicolaus Copernicus (1473-1543) first suggested that the Earth and all other planets orbit the Sun in...
2.9K
Kepler's First Law of Planetary Motion
4.9K
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,...
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,...
4.9K
Kepler's Second Law of Planetary Motion
4.7K
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...
While in an elliptical orbit, the total energy of the planet is conserved. Therefore, the planet slows down when it is at apogee and...
4.7K
Kepler's Third Law of Planetary Motion
3.6K
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...
3.6K

