Astronomy cards 3

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  1. The transit method of planet detection works best for
    big planets in edge-on orbits around around small stars.
  2. The reason that most extrasolar planets are found close to their parent stars is
    the amount and frequency of the star's motion are both higher.
  3. What are the two main differences between extrasolar planetary systems discovered to date and our Solar System?
    extrasolar planet orbits tend to be closer and more eccentric than in our Solar System
  4. A planet is detected via the Doppler technique. The velocity change of the star is a measure of
    the planet's mass and orbital distance.
  5. A planet is detected via the Doppler technique. The repeating pattern of the stellar motion tells us
    the orbital period of the planet.
  6. A planet is detected via the Doppler technique. The shape of the periodic velocity pattern tells us
    the orbital eccentricity of the planet.
  7. Why are many of the newly detected extrasolar planets called "hot Jupiters"?
    Their masses are similar to Jupiter but they are very close to the central star and therefore hot.
  8. How do we think the "hot Jupiters" around other stars were formed?
    They formed as gas giants beyond the frost line and then migrated inwards.
  9. Why is it so difficult to take pictures of extrasolar planets?
    Their light is overwhelmed by the light from their star.
  10. Suppose a planet is discovered by the Doppler technique and is then discovered to have transits. In that case, we can determine all the following about the planet except ________.
    its rotation period
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Astronomy cards 3
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