全部书籍

1 Primary & Middle School Mathematics1–9 年级在线 2 High School Mathematics10–12 年级在线 3 University Mathematics — Year 1本科一年级在线 4 University Mathematics — Year 2本科二年级在线 5 University Mathematics — Year 3本科三年级在线

1 Primary & Middle School Physics1–9 年级在线 2 High School Physics10–12 年级在线 3 University Physics — Year 1本科一年级在线 4 University Physics — Year 2本科二年级在线 5 University Physics — Year 3本科三年级在线

1 School Chemistry — Grades 1 to 121–12 年级在线 2 University Chemistry — Year 1本科一年级在线 3 University Chemistry — Year 2本科二年级在线 4 University Chemistry — Year 3本科三年级在线

1 Primary & Middle School Biology1–9 年级在线 2 High School Biology10–12 年级在线 3 University Biology — Year 1本科一年级在线 4 University Biology — Year 2本科二年级在线 5 University Biology — Year 3本科三年级在线

1 Primary & Middle School Earth and Space Sciences1–9 年级在线 2 High School Earth and Space Sciences10–12 年级在线 3 University Earth and Space Sciences — Year 1本科一年级在线 4 University Earth and Space Sciences — Year 2本科二年级在线 5 University Earth and Space Sciences — Year 3本科三年级在线

1 Markets I: The Ecosystem and Exchange-Traded Markets市场在线 2 Markets II: Rates, FX and Credit市场在线 3 Markets III: Commodities, Energy and Crypto市场在线 4 Quantitative Methods方法在线 5 Derivatives and Volatility衍生品在线 6 Rates, Credit, XVA and Risk利率、信用与风险在线 7 Research Craft: Predictors, Backtests, Measurement, Portfolios研究在线 8 Strategies I: Equities and Futures策略在线 9 Strategies II: Volatility, Relative Value, Macro and the Bank Desks策略在线 10 Microstructure and Execution交易执行在线 11 Market Making and High-Frequency Trading做市在线 12 Machine Learning for Markets机器学习在线 13 Low-Latency Software技术在线 14 Networks, Hardware and Trading Infrastructure技术在线 15 Research, Data and Risk Platforms技术在线 16 The Desk and the Firm公司运营在线 17 The Industry: Firms, Roles and Careers职业发展在线 18 Interviews I: Maths, Probability and Speed职业发展在线 19 Interviews II: Markets, Trading Games and the Final Round职业发展在线 20 Interviews III: Code职业发展在线

全部游戏 Math Fuse Word Reactor Atlas Dash

应用关于

Coach

English Français Español Nederlands Português हिन्दी العربية Bahasa Indonesia 简体中文 বাংলা

登录开始阅读

书籍暂未推出简体中文版——当前显示英文版。

Earth and Space Sciences · 术语表

什么是 Radial-velocity method; minimum mass？

又称： radial-velocity method · minimum mass

Definition 28.1 University Earth and Space Sciences — Year 3 · 第 28 章 — Exoplanets

The radial-velocity method detects a planet by the periodic variation of the radial velocity of its star, measured from the Doppler shift of the lines of the star’s spectrum. When the inclination $i$ of the orbit to the plane of the sky is unknown, it measures only the product $m_p\sin i$ of the planet’s mass by the sine of the inclination, the minimum mass of the planet.

$The radial velocity of a star with one planet, over two orbits, for an invented planet with K = 30\, m\, s-1 and a period of ten days. On a circular orbit (solid) the curve is a sinusoid of semi-amplitude K. On an eccentric orbit (dashed) the star moves fastest near periastron, and the curve becomes lopsided: its extremes are K(1 ± e ) and the peak-to-peak swing stays 2K.$

The radial velocity of a star with one planet, over two orbits, for an invented planet with

K = 30\,\mathrm{m}\,\mathrm{s}^{-1}

and a period of ten days. On a circular orbit (solid) the curve is a sinusoid of semi-amplitude

K

. On an eccentric orbit (dashed) the star moves fastest near periastron, and the curve becomes lopsided: its extremes are

K(1 \pm e\cos\omega)

and the peak-to-peak swing stays

2K

.

在原文中阅读 →