Coming from a White Dwarf Star Explosion

In addition to the remnants of the supernova explosion MSH 15-52, astronomers at NASA’s Chandra X-ray Observatory also studied a material called G1.9+0.3. A research report published in 2016 suggests the material is the remnant of a fairly young supernova, which occurred 110 years ago.
Together with NSF and the Jansky Very Large Array (VLA), NASA studied G1.9+0.3 which is categorized as a Type Ia supernova, an important high-brightness supernova class type. This material by astronomers is considered useful for measuring the expansion rate of the universe after the Big Bang.
“Astronomers used Type Ia supernovae as markers of distance across the universe, which helped us find that they were expanding rapidly,” said lead researcher from Harvard University, Sayan Chakraborti.
“If there is a difference in how these supernovae explode and the amount of light they produce, it could have an impact on our understanding of this expansion.”
So far, most scientists agree Type Ia supernovae occur when white dwarfs or solid remnants of sun-like stars that run out of fuel explode. There are two possible explosions, firstly the accumulation of matter into the white dwarf from a companion star or the violent merging of two white dwarfs.
Researchers at the Chandra observatories and VLA are working by studying how the supernova remnant G1.0+0.3 interacts with the gas and dust around the explosion. The results show that an explosion occurred during the collision of two white dwarfs, obtained from the resulting X-ray and radio emission data.
“We observed that X-ray and radio brightness increased over time, so the data strongly suggest a collision between two white dwarfs triggering the supernova explosion at G1.9+0.3,” said Harvard University co-author Francesca Childs.
Reports suggest the occurrence of Type Ia supernovae are all caused by collisions with white dwarfs, or are caused by a mixture of white dwarf collisions and the mechanism by which the white dwarf pulls matter from the companion star.
“It is important to identify the triggering mechanism for Type Ia supernovae because if there is more than one cause, then the contribution of each can change over time,” said Harvard University co-author Alicia Soderberg. hi/I-1

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Editor : Ilham Sudrajat

Author : Haryo Brono




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