Black hole collides with Sun: How rapidly is energy released?

Basic idea: Primordial black hole (2.5% of Sun's mass) directly approaches Sun at fairly rapid pace (300 km/s).

Consequently, six days after passing Earth's orbit, it will collide with the Sun; accounting for additional gravitational acceleration as it approaches, the collision will result in many orders of magnitude more kinetic energy (~1E+40 J) dissipating into heat than the Sun radiates every second (3.828E+26 J), i.e. equivalent to about one million years of solar radiation.

How long would it take for this to make itself felt?

Will there be an instantaneous, GRB-like "flash" that scours Earth's surface of life? Or will it be concentrated in a few coronal mass ejections? Is luminosity going to build up over a period of minutes, hours, days, weeks, maybe even years? I assume most of the heat will be dissipated deep within the Sun, and it is going to need time to work its way up to the surface. When is it going to reach its peak?

Could at least people in deep bunkers survive that "flash"? Or will it basically scour away the surface of the planet.

(Idea is that the black hole is detected in advance and there is a race to build an Orion Drive powered colony ship. The ship lifts off just in time. Will anybody in ground control survive that flash? If so, how long before the world warms to such an extent that they die anyway? I would like to have people on Earth survive the initial flash and for as long as possible thereafter as scientifically plausible... but they do need to die in the end).

Thanks in advance.

posted about 5 years ago

ak7‭

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