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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 l.jpg
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


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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).


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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).


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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 l.jpg
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)‏


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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