If an extrasolar planet suddenly became larger in radius, but kept the same mass and orbit, what would change in the observed Doppler shift of the star? The Doppler shift pertains to sound waves, to the planet will get louder. The lowest velocity of the star would be slower. The shape of the velocity curve would become less symmetric. The peak velocity of the star would be faster. The time between peaks in the velocity of the star would decrease. Nothing. The radius of a planet does not affect the Doppler shift.

If an extrasolar planet suddenly became larger in radius, but kept the same mass and orbit, what would change in the observed Doppler shift of the star? The Doppler shift pertains to sound waves, to the planet will get louder. The lowest velocity of the star would be slower. The shape of the velocity curve would become less symmetric. The peak velocity of the star would be faster. The time between peaks in the velocity of the star would decrease. Nothing. The radius of a planet does not affect the Doppler shift.