by Ann » Wed Feb 09, 2022 11:02 am
Eta Carina shows similarities with a supernova impostor. ( ͡° ͜ʖ ͡°)
Wikipedia wrote:
Supernova impostors are stellar explosions that appear at first to be a supernova but do not destroy their progenitor stars. As such, they are a class of extra-powerful novae.
They are also known as Type V supernovae, Eta Carinae analogs, and giant eruptions of luminous blue variables (LBV).
Eta Carina underwent
a series of spectacular brightenings in the 19th century. Even more spectacular was the supernova impostor of 2004 in galaxy UGC 4904, which exploded as a true supernova, SN 2006jc, in 2006, only two years after its first great outburst.
Wikipedia wrote about SN 2006jc:
SN 2006jc was a supernova that was detected on October 9, 2006 in the galaxy UGC 4904, which is about 77 million light-years away in the constellation Lynx. It was first seen by Japanese amateur astronomer Koichi Itagaki, American amateur Tim Puckett and Italian amateur Roberto Gorelli.
Two years earlier, the progenitor star produced a supernova impostor that was detected by Itagaki. This outburst was apparently the progenitor star shedding its outer layers. When the star exploded in 2006, the shockwave hit the material blown off in 2004, heating it to millions of degrees and emitting copious amounts of X-rays.
So SN 2006jc exploded twice, in 2004 and 2006, except it was only in 2006 that it exploded for real and blew itself to smithereens!
A. Pastorello et.al. wrote in an article in Nature in 2007,
A giant outburst two years before the core collapse of a massive star:
Here we report that the peculiar Type Ib supernova SN2006jc is spatially coincident with a bright optical transient that occurred in 2004. Spectroscopic and photometric monitoring of the supernova leads us to suggest that the progenitor was a carbon oxygen Wolf-Rayet star embedded within a helium-rich circumstellar medium. There are different possible explanations for this preexplosion transient. It appears similar to the giant outbursts of Luminous Blue Variables (LBV) of 60-100 solar mass (M
⊙) stars, however the progenitor of SN2006jc was helium and hydrogen deficient.
An LBV-like outburst of a Wolf-Rayet star could be invoked, but this would be the first observational evidence of such a phenomenon.
Alternatively a massive binary system composed of an LBV which erupted in 2004, and a Wolf-Rayet star exploding as SN2006jc, could explain the observations.
Ann
Eta Carina shows similarities with a supernova impostor. ( ͡° ͜ʖ ͡°)
[clear][/clear]
[quote][url=https://en.wikipedia.org/wiki/Supernova_impostor]Wikipedia[/url] wrote:
Supernova impostors are stellar explosions that appear at first to be a supernova but do not destroy their progenitor stars. As such, they are a class of extra-powerful novae. [b]They are also known as Type V supernovae, [size=120][color=#00efff]Eta Carinae analogs[/color][/size], and giant eruptions of luminous blue variables (LBV)[/b].[/quote]
Eta Carina underwent [url=https://en.wikipedia.org/wiki/Eta_Carinae#Great_Eruption]a series of spectacular brightenings[/url] in the 19th century. Even more spectacular was the supernova impostor of 2004 in galaxy UGC 4904, which exploded as a true supernova, SN 2006jc, in 2006, only two years after its first great outburst.
[float=right][img3="Swift Ultraviolet/Optical Telescope image of Supernova 2006jc in the galaxy UGC 4904 in three filters. Image: NASA/Swift/S. Immler."]https://upload.wikimedia.org/wikipedia/commons/2/2c/Supernova_SN_2006jc.jpg[/img3][/float][quote][url=https://en.wikipedia.org/wiki/SN_2006jc]Wikipedia[/url] wrote about SN 2006jc:
SN 2006jc was a supernova that was detected on October 9, 2006 in the galaxy UGC 4904, which is about 77 million light-years away in the constellation Lynx. It was first seen by Japanese amateur astronomer Koichi Itagaki, American amateur Tim Puckett and Italian amateur Roberto Gorelli. [b][color=#FF0000]Two years earlier, the progenitor star produced a supernova impostor that was detected by Itagaki.[/color][/b] This outburst was apparently the progenitor star shedding its outer layers. When the star exploded in 2006, the shockwave hit the material blown off in 2004, heating it to millions of degrees and emitting copious amounts of X-rays.💥[/quote]
So SN 2006jc exploded twice, in 2004 and 2006, except it was only in 2006 that it exploded for real and blew itself to smithereens!💥
[quote]A. Pastorello et.al. wrote in an article in Nature in 2007, [i][b]A giant outburst two years before the core collapse of a massive star[/b][/i]:
Here we report that the peculiar Type Ib supernova SN2006jc is spatially coincident with a bright optical transient that occurred in 2004. Spectroscopic and photometric monitoring of the supernova leads us to suggest that the progenitor was a carbon oxygen Wolf-Rayet star embedded within a helium-rich circumstellar medium. There are different possible explanations for this preexplosion transient. It appears similar to the giant outbursts of Luminous Blue Variables (LBV) of 60-100 solar mass (M[sub][size=90]⊙[/size][/sub]) stars, however the progenitor of SN2006jc was helium and hydrogen deficient. [b][color=#FF0000]An LBV-like outburst of a Wolf-Rayet star could be invoked[/color][/b], but this would be the first observational evidence of such a phenomenon. [b][color=#0040FF]Alternatively a massive binary system composed of an LBV which erupted in 2004, and a Wolf-Rayet star exploding as SN2006jc, could explain the observations.💥[/color][/b] [/quote]
Ann