A Photometric Search for Extra-Solar Planets: The Prototype System and Early Results

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Scientific paper

Searching for planets orbiting other stars has become an area of intense interest in recent years. Most current search programs use high precision radial velocity methods and long term, detailed monitoring of a few, bright F and G stars. Photometric methods have been briefly considered over the last few years, but are generally thought to be unable to reach the necessary precision levels without resorting to expensive space missions. We present a report on a low-cost photometric search testbed telescope. We show that detections of planetary transits by Jupiter-sized bodies are easily accomplished for stars of spectral type F-M, and Neptune sized bodies in orbit around K or M stars may even be detected by modest ground based telescopes. Our system is capable of producing simultaneous, ultra high-precision photometric measurements of hundreds of stars, currently yielding standard deviations as small as +/- 0.004 magnitudes or 0.4%, allowing the possible detection of Jupiter sized bodies. Finally, error sources and minimization as well as future prospects are discussed.

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