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From the light-curve for a planet transiting in front of a star: The time difference tB tA is 32 minutes and the time difference tC

From the light-curve for a planet transiting in front of a star: The time difference tB tA is 32 minutes and the time difference tC tA is 227 minutes. The flux at tA is 1, at tB and tC is 0.98. he star has a radius of 1.5 R. The star is measured to have a maximum radial velocity of 0.5 km/s, how fast is the planet moving? 2

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