Supernova explosion n angular momentum

AI Thread Summary
A supernova explosion causes a star to lose 20% of its mass, but this does not immediately affect the motion of a planet orbiting it. The angular momentum of the planet remains conserved, leading to changes in its orbit depending on its initial shape. If the planet was in a circular orbit, it would transition to a new elliptical orbit with a higher velocity at periapsis. Conversely, if the planet was already in an elliptical orbit, its periapsis would remain unchanged, but the semi-major axis would decrease. Understanding these dynamics is crucial for entrance exam preparation.
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a planet moves around a star. (mass of planet << mass of star). the star undergoes a supernova explosion and loses 20% of its mass. the explosion does not directly affect the motion of the plant at that instant. how would this change the angular momentum of the planet ant the shape of its orbit. what would happen if it was in a circular orbit? what would happen if it was in an elliptical orbit?
 
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could someone please help me out here... I'm preparin for an entrance exam
 

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