How Are Planets Detected Through Transit Method?

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SUMMARY

The transit method for detecting extrasolar planets primarily utilizes visible-light photometry. This technique allows for the identification of planets as they pass in front of their host stars, causing a measurable decrease in brightness. The effectiveness of this method is contingent upon the alignment of the planet's orbital plane with the observer's line of sight. Amateur astronomers can successfully employ small telescopes to detect these transits, although the size ratio of the planet to its star plays a critical role in the detectability of the transit signal.

PREREQUISITES
  • Understanding of visible-light photometry
  • Familiarity with the concept of extrasolar planets
  • Knowledge of orbital mechanics
  • Basic skills in using telescopes for astronomical observations
NEXT STEPS
  • Research the principles of visible-light photometry in astronomy
  • Explore the methods for calculating the planet-to-star size ratio
  • Learn about the alignment requirements for successful transit observations
  • Investigate the use of amateur telescopes for detecting transits
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Astronomy enthusiasts, amateur astronomers, and educators interested in the methods of detecting extrasolar planets through the transit method.

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How exactly is this done? Is it done in the visible wavelengths or in the radio? Also, how small can the (planet size)/(sun size) ratio be. I'd expect that given noise especially, there's a definite lower limit.
 
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Just do a Google search on the relevant terms (extrasolar, planet, transit, etc) and you will get all the information you need. It's possible to discover extrasolar planets through visible-light photometry with small amateur telescopes. The trick is that the plane of the planets' orbits have to be pointed pretty much at us, so we can see the planet superimposed over its star.
 

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