What physical property does the RV method only provide a lower limit for due to geometric limitations?

Answer

Planet's mass (M sin i)

Because the RV method only measures the radial component of motion, it cannot determine the system's inclination ($i$). Therefore, it only yields a minimum mass estimate expressed as $M \sin i$.

What physical property does the RV method only provide a lower limit for due to geometric limitations?

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Observatory Online: Exoplanets and the Radial Velocity Method

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