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Planets and Life in Other Star Systems

Planets and Life in Other Star Systems. Detection of Extra Solar Planets. Planets are too faint to be observed by normal optical imaging Several “indirect” approaches have allowed discovery of very large planets in other star systems.

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Planets and Life in Other Star Systems

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  1. Planets and Life in Other Star Systems

  2. Detection of Extra Solar Planets • Planets are too faint to be observed by normal optical imaging • Several “indirect” approaches have allowed discovery of very large planets in other star systems. • There are nearly 70 extra solar planetary systems know know to exist.

  3. Current Detection Methods • Astrometric • Radial Velocity • Occultation • Interferometery

  4. Astrometric Detection • Early observers hoped to see a “wobble” in the motion of a star produced by the gravity interaction between the star and planet. The effect is probably too small to be observed from Earth.

  5. Astrometric Detection • Early observers hoped to see a “wobble” in the motion of a star produced by the gravity interaction between the star and planet. The effect is probably too small to be observed from Earth.

  6. Radial Velocity (Doppler) Detection • Spectra lines from a star will “shift” due to the wobble effect produced by the attractive force of a planet.

  7. Radial Velocity (Doppler) Detection • Spectra lines from a star will “shift” due to the wobble effect produced by the gravitational force of a planet.

  8. Radial Velocity (Doppler) Detection • Doppler (radial velocity) curve for the star 51 Pegasi. This is the first “normal” star discovered to have a planet.

  9. 51 Pegasi

  10. Occultation Detection • Detection of the decrease in starlight intensity as a planet passes in from of the star. Venus occultating (transit) across the face of the sun

  11. Occultation Detection • Detection of the decrease in starlight intensity as a planet passes in from of the star.

  12. Current limits on detection • Only very large planets, orbiting close to their sun are detectible by the current methodologies. Earth-like planets are “invisible.”

  13. Interferometer Detection • Two or more telescopes are used in tandem to obtain very precise position information for a star or produce and crude “image” of the planet Darwin Interferometeric telescopes

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