The planet that orbits a massive spinning strobe light

  • November 25, 2013
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The planet that orbits a massive spinning strobe light


Astronomy is full of mysteries. From our daily experience we expect the a planet should orbit a normal star. However, planet PSR B1257+12 B is the first of the handful planets ever discovered which orbit a pulsar.


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Pulsar




For those unfamiliar, a pulsar is something in between a normal star and a black hole. At the end of its life a star losses all its fuel and collapses†under its own gravity†and go for a supernova explosion. After supernova explosion the core of a very large mass star contracts to form a black hole. However, if the star is of a medium size mass then it instead of collapsing to a black hole, it forms a neutron star. It retains most of its†angular momentum. Since it has only a tiny fraction of its parent's radius (and therefore its†moment of inertia†is sharply reduced), a neutron star is formed with very high rotation speed. Neutron stars are known to have rotation periods from about 1.4 ms to 30 seconds. They emit highly focused beams from two poles and hence they are also known as the pulsars.


Exoplanet_Comparison_PSR_B1257+12_B

Size comparison of PSR B1257+12 B with Earth and Neptune.




PSR B1257+12 c†(ex†PSR B1257+12 B) is an†extrasolar planet†(approximately 980†light-years†away) in the†constellation†of†Virgo†(theVirgin). PSR B1257+12B was the first planet ever discovered outside the†Solar System, and is one of three objects known to be orbiting the†pulsar†PSR B1257+12, which it circles at a distance of 0.36 AU with an orbital period of approximately 66†days. The†planet†is over four times as massive as the Earth.




PSR_B1257+12_B


The only light what the planet receive is the deadly radiation from the pulsar, but at least it looks awfully pretty. The pulsar emits radiation in a beam shape. So any observer on the planet will see a giant bulb strove in its sky.


Artist's_concept_of_PSR_B1257+12_system
Artist's concept of a planet rotating a pulsar


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