Supernovas are not always so super. These explosions that mark the death of a star often are spectacularly energetic. But once in a while they are a complete dud.
The neutron star's mass is about 1.4 times that of our sun, having previously been 12 times more massive than the sun. Its companion star boasts a mass 18 to 19 times greater than the sun after cannibalizing its mate. The two stars orbit around each other every 59-1/2 days, separated by about eight-tenths of the distance existing between Earth and the sun.
"Since there is little material in the stellar envelope, there is almost no ejecta from the shock of the collapse," said Arizona-based astronomer Noel Richardson of Embry-Riddle Aeronautical University, lead author of the study published in the journalStudy co-author Clarissa Pavao, an Embry-Riddle undergraduate student studying physics, described the explosion as: "Faint, subtle and passive.
The type of binary system examined in this study is rare, with roughly 10 estimated to exist in a Milky Way populated by about 100-400 billion stars.
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