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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
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 122
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).
astr 2310 chapter 123
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).
astr 2310 chapter 124
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.
astr 2310 chapter 125
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)‏
astr 2310 chapter 126
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