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ASTR 2310: Chapter 12

ASTR 2310: Chapter 12. The Solar System in Perspective Comparative Planetology (“Lessons”) ‏ Origin of the Solar System Exoplanets Detection Properties See Exoplanet Resources posted at http://www.mikebrotherton.com/?p=2168. ASTR 2310: Chapter 12. Comparative Planetology

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ASTR 2310: Chapter 12

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  1. ASTR 2310: Chapter 12 • The Solar System in Perspective • Comparative Planetology (“Lessons”)‏ • Origin of the Solar System • Exoplanets • Detection • Properties • See Exoplanet Resources posted at http://www.mikebrotherton.com/?p=2168

  2. ASTR 2310: Chapter 12 • Comparative Planetology • Lesson 1: Surfaces of planets are shaped by competing internal and external mechanisms (e.g. volcanism vs. cratering). • Lesson 2: More massive, colder planets are better able to retain atmospheres (e.g., Pluto, Moon, Mercury, Mars, Venus, Earth, Jovian planets, in increasing mass).

  3. ASTR 2310: Chapter 12 • Comparative Planetology • Lesson 3: Giant satellites of Jovian planets show patterns consistent with our ideas about formation of the planets (e.g. they're mini-solar systems). • Lesson 4: Many unusual features of the solar system can be attributed to giant impacts (Earth's moon, Triton, Uranus, Venus).

  4. ASTR 2310: Chapter 12 • Origin of the Solar System • Emerging picture of a rotating protoplanetary disk explains • Planets nearly in same plane • Sun's equator is close to this plane. • Planetary orbits are nearly circular. • Planets orbit in same direction. • Most planets and sun rotate in same direction as the orbital motion.

  5. ASTR 2310: Chapter 12 • Origin of the Solar System • Other issues also addressed • Nature of small bodies – left overs, with many moons formed around Jovian planets, smallest stuff replenished from collisions • Differences in chemical composition (metal, stone, ices, volatiles)‏ • Rings around Jovian planets (failed moons or destroyed moons)‏ • Chemical differentiation of terrestrial planets (radioactivity)‏

  6. ASTR 2310: Chapter 12 • Exoplanets • Detection • Difficulties • Center of Mass Wobbles • Transit Method (eclipses)‏ • Properties • Not quite like solar system planets • In part because different things can happen • In part because of selection effects

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