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Lecture 20

Lecture 20 - Extrasolar Planets-Transit Method - November 26.docx

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University of Toronto St. George
Astronomy & Astrophysics
Michael Reid

November 26, 2013. Leftover from last lecture; Saturn’s rings/moons Outer shepherd moon: • Orbits slower than ring particle • Pulls it backward • Slows it down • Removes energy from ring particle • So, particle falls inward • Reverse occurs for an inner shepherd moon Planetary Rings • Could be leftover material from the formation of the solar system • Could be small captured objects that smash into each other and create debris/rings • Roche limit: distance from the planet within which a satellite/moon/asteroid/comet would have to be to get “shredded” by the planet’s gravitational force? • Rings are actually made up of millions of tiny particles o Likely the product of collisions with and between moons Lecture 20 - Extrasolar Planets: Transit Method Extrasolar Planets or “Exoplanets” • Planets outside our solar system o “Aplanet orbiting a star other than the sun” • Rogue Planet: a planet which isn’t orbiting a star o Rogue planets wander in interstellar sp
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