4. Answer the following questions on extrasolar planets A. Th e first technique

Question

4. Answer the following questions on extrasolar planets A. Th e first technique to detect many exoplanets was the radial velocity method, measuring the reflex doppler shift of the star due to the planet's orbit. Why might this technique be particularly suited to detect "Hot Jupiters"? Explain the reason for both the words. B. Could some of the "Hot Jupiters" in-fact be low-mass stellar companions? Explain C. If the minim um mass (M sin i) of a Doppler (radial-velocity detected) planet is measured up, what inclination would make the "planet" a low-mass brown dwarf and to be 2.5 M what inclination would make it a low-m 13-80 Mup ass star? (assume brown dwarf masses range D. If you lived on another solar system and witnessed an eclipse of the Sun by Jupiter, what fraction of the solar flux would be blocked out during the maximum eclipse?

Explanation / Answer

Answer (A)-- a)The radial velocity method relies on the fact that a star does not remain completely stationary when it is orbited by a planet.The radial velocity method is most likely to find the types of planets that are the least likely to be hosts to life.Hot Jupiter are relatively easy to find, they are unlikely homes to any form of life.Hot Jupiters are giant planets composed mostly of gas,but orbiting at dizzying speeds at a very short distance from their star. Their size, short periods, and close proximity to their star ensures that they produce the quick and relatively large stellar wobbles that are most easily detected by Radial Velocity method.

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