|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Famous 400-year old Supernova revealed to be double-white dwarf explosion
400-Year-Old Star Explosion Mystery Finally Solved | Supernovas & White
Dwarf Stars | Star Mysteries & 219th American Astronomical Society Meeting | Space.com http://www.space.com/14202-supernova...ed-aas219.html "Call it a cosmic scene investigation. A team of astronomer sleuths has identified the trigger for a powerful supernova that exploded four centuries ago, finding it to be the collision of two white dwarf stars. The discovery settles decades of questions over the origin of so-called Type 1a supernovas, researchers said. Astronomers have long suspected that two stars were responsible for the explosion, with one being a white dwarf — a compact, dying star. But scientists weren't sure if both culprits were white dwarf stars that crashed, or consisted of one white dwarf that siphoned off material from a regular companion star. Both scenarios could cause the supernova." |
#2
|
|||
|
|||
Famous 400-year old Supernova revealed to be double-white dwarf explosion
Dear Yousuf Khan:
On Jan 12, 7:45*am, Yousuf Khan wrote: 400-Year-Old Star Explosion Mystery Finally Solved | Supernovas & White Dwarf Stars | Star Mysteries & 219th American Astronomical Society Meeting | Space.com snip link now broken by Google.Groups "Call it a cosmic scene investigation. *A team of astronomer sleuths has identified the trigger for a powerful supernova that exploded four centuries ago, finding it to be the collision of two white dwarf stars. The discovery settles decades of questions over the origin of so-called Type 1a supernovas, researchers said. Astronomers have long suspected that two stars were responsible for the explosion, with one being a white dwarf — a compact, dying star. But scientists weren't sure if both culprits were white dwarf stars that crashed, or consisted of one white dwarf that siphoned off material from a regular companion star. Both scenarios could cause the supernova." 23 light years across, after ~400 years... less than 0.03c from center. All that raw power, and that is all the faster the "blast wave" moves... David A. Smith |
#3
|
|||
|
|||
Famous 400-year old Supernova revealed to be double-white dwarf explosion
dlzc wrote:
Dear Yousuf Khan: On Jan 12, 7:45 am, Yousuf Khan wrote: 400-Year-Old Star Explosion Mystery Finally Solved | Supernovas & White Dwarf Stars | Star Mysteries & 219th American Astronomical Society Meeting | Space.com snip link now broken by Google.Groups "Call it a cosmic scene investigation. A team of astronomer sleuths has identified the trigger for a powerful supernova that exploded four centuries ago, finding it to be the collision of two white dwarf stars. The discovery settles decades of questions over the origin of so-called Type 1a supernovas, researchers said. Astronomers have long suspected that two stars were responsible for the explosion, with one being a white dwarf — a compact, dying star. But scientists weren't sure if both culprits were white dwarf stars that crashed, or consisted of one white dwarf that siphoned off material from a regular companion star. Both scenarios could cause the supernova." 23 light years across, after ~400 years... less than 0.03c from center. All that raw power, and that is all the faster the "blast wave" moves... David A. Smith If you think a speed of 9000 km/sec is "slow", that's your problem, isn't it? Sounds pretty fast to me, and quite typical of supernova envelope expansion speeds. -- Mike Dworetsky (Remove pants sp*mbl*ck to reply) |
#4
|
|||
|
|||
Famous 400-year old Supernova revealed to be double-white dwarf explosion
Dear Mike Dworetsky:
On Jan 12, 3:21*pm, "Mike Dworetsky" wrote: dlzc wrote: Dear Yousuf Khan: On Jan 12, 7:45 am, Yousuf Khan wrote: 400-Year-Old Star Explosion Mystery Finally Solved | Supernovas & White Dwarf Stars | Star Mysteries & 219th American Astronomical Society Meeting | Space.com snip link now broken by Google.Groups "Call it a cosmic scene investigation. A team of astronomer sleuths has identified the trigger for a powerful supernova that exploded four centuries ago, finding it to be the collision of two white dwarf stars. The discovery settles decades of questions over the origin of so-called Type 1a supernovas, researchers said. Astronomers have long suspected that two stars were responsible for the explosion, with one being a white dwarf — a compact, dying star. But scientists weren't sure if both culprits were white dwarf stars that crashed, or consisted of one white dwarf that siphoned off material from a regular companion star. Both scenarios could cause the supernova." 23 light years across, after ~400 years... less than 0.03c from center. *All that raw power, and that is all the faster the "blast wave" moves... If you think a speed of 9000 km/sec is "slow", that's your problem, isn't it? Not really. *Sounds pretty fast to me, and quite typical of supernova envelope expansion speeds. People whine and complain about Relativity, like it was keeping our butts on this planet. Here we have a relative whiff of gas, propelled by a supernova. It would take about 143 years to get to the nearest star had it started here, and relativistic effects wouldn't be all that much. I'm just trying to show some perspective here, not trying to say how puny supernovas are. Good to know the speeds are typical. Thanks. Is the "glow" recombination of (primarily) outbound material, or interaction of outbound material with interstellar medium... do you know? David A. Smith |
#5
|
|||
|
|||
Famous 400-year old Supernova revealed to be double-white dwarf explosion
dlzc wrote:
Dear Mike Dworetsky: On Jan 12, 3:21 pm, "Mike Dworetsky" wrote: dlzc wrote: Dear Yousuf Khan: On Jan 12, 7:45 am, Yousuf Khan wrote: 400-Year-Old Star Explosion Mystery Finally Solved | Supernovas & White Dwarf Stars | Star Mysteries & 219th American Astronomical Society Meeting | Space.com snip link now broken by Google.Groups "Call it a cosmic scene investigation. A team of astronomer sleuths has identified the trigger for a powerful supernova that exploded four centuries ago, finding it to be the collision of two white dwarf stars. The discovery settles decades of questions over the origin of so-called Type 1a supernovas, researchers said. Astronomers have long suspected that two stars were responsible for the explosion, with one being a white dwarf — a compact, dying star. But scientists weren't sure if both culprits were white dwarf stars that crashed, or consisted of one white dwarf that siphoned off material from a regular companion star. Both scenarios could cause the supernova." 23 light years across, after ~400 years... less than 0.03c from center. All that raw power, and that is all the faster the "blast wave" moves... If you think a speed of 9000 km/sec is "slow", that's your problem, isn't it? Not really. Sounds pretty fast to me, and quite typical of supernova envelope expansion speeds. People whine and complain about Relativity, like it was keeping our butts on this planet. Here we have a relative whiff of gas, propelled by a supernova. It would take about 143 years to get to the nearest star had it started here, and relativistic effects wouldn't be all that much. I'm just trying to show some perspective here, not trying to say how puny supernovas are. Good to know the speeds are typical. Thanks. Is the "glow" recombination of (primarily) outbound material, or interaction of outbound material with interstellar medium... do you know? Caveat: I didn't read this particular paper, but in general, as I recall, The initial emission of light over a few weeks or months is governed by energy from the decay of radioactive nuclei created during the explosion, but after 400 years, it is mainly from the collisions of the expanding envelope with the interstellar medium gases. The expanding envelope is faster than the speed of sound in the tenuous gas, so it's a a shock wave. -- Mike Dworetsky (Remove pants sp*mbl*ck to reply) |
#6
|
|||
|
|||
Famous 400-year old Supernova revealed to be double-white dwarfexplosion
On 1/12/2012 11:21 AM, dlzc wrote:
23 light years across, after ~400 years... less than 0.03c from center. All that raw power, and that is all the faster the "blast wave" moves... Yeah, I was thinking the same thing. One of the biggest blasts in the universe, and that's the only catapult you get out of it. Yousuf Khan |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Nearby white dwarf found, ready to go supernova | Yousuf Khan | Astronomy Misc | 30 | September 21st 09 03:25 AM |
White Dwarf "Sibling Rivalry" Explodes into Supernova (Forwarded) | Andrew Yee[_1_] | News | 0 | January 8th 08 05:32 AM |
White dwarf and ultra-cool dwarf keep their distance (Forwarded) | Andrew Yee | Astronomy Misc | 0 | April 24th 07 09:45 PM |
Pre-Supernova White Dwarf Uncovered by Hubble Team (Forwarded) | Andrew Yee | Astronomy Misc | 0 | January 14th 06 06:25 AM |
Pre-Supernova White Dwarf Uncovered by Hubble Team (Forwarded) | Andrew Yee | News | 0 | January 14th 06 05:56 AM |