Lecture_9

Lecture_9 - 1 Chapter 8 Chapter 8 Jovian Planet Systems...

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Unformatted text preview: 1 Chapter 8 Chapter 8 Jovian Planet Systems Jovian Planet Systems A Different Kind of Planet A Different Kind of Planet Our Goals for Learning What are Jovian planets made of? What are Jovian planets like on the inside? What is the weather like on Jovian planets? The Jovian Planets The Jovian Planets Bigger & more massive Lower density, different composition Rings Numerous moons What are Jovian planets made of? What are Jovian planets made of? Jupiter & Saturn: almost all H & He , very little metal & rock ( less dense ) Uranus & Neptune: <50% H & He, the rest hydrogen compounds (water, methane, ammonia), with some metal & rock ( more dense ) Why are they different? 2 Jovian planet formation Jovian planet formation Beyond the frost line, planetesimals could accumulate ICE . Hydrogen compounds are more abundant than rock/metal so icy Jovian planet cores got bigger and with that much gravitational mass acquired H/He atmospheres directly from the solar nebula. Differences in Jovian planet formation TIMING: the planet that forms earliest captures the most hydrogen & helium gas. Capture ceases after the first solar wind blew the leftover gas away. LOCATION: the planet that forms in a denser part of the nebula forms its core first. Jupiter and Saturn are nearly the same size But Jupiter is 3x more massive than Saturn More massive planets could even be smaller! COMPRESSION of Gas Giants The stack of pillows model What are Jovian planets like on the inside? No solid surface. Layers are under high pressure and temperatures. Cores (~10 Earth masses) made of hydrogen compounds, metals & rock The layers are different for the different planets. WHY? 3 Layers Differ in Phase Layers Differ in Phase Density of liquid water is ~1g/cm 3 Metallic hydrogen liquid conducts electricity; but it is not solid. It is a dense fluid.solid....
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Lecture_9 - 1 Chapter 8 Chapter 8 Jovian Planet Systems...

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