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T Pyxidis Soon To Be A Type Ia Supernova
Space Daily ^ | Jan 05, 2010 | Staff

Posted on 01/05/2010 4:39:06 AM PST by PeaceBeWithYou

Astronomers have uncovered evidence that a massive, explosive white dwarf star in a binary star system with a Sun-like star in our Milky Way Galaxy is growing in mass and is much closer to our solar system than previously thought.

The report is being presented by Drs. Edward M. Sion, Patrick Godon and student Timothy McClain of Villanova University at the 215th meeting of the American Astronomical Society in Washington, DC.

This result is of special interest because it may shed light on the still unidentified type of stellar objects that explode as Type Ia supernovae, the kind of supernova which has been used to demonstrate that the expansion of the universe is accelerating.

The close binary system T Pyxidis, located in the southern hemisphere constellation Pyxis ("the Compass Box"), is known as a recurrent nova because its massive white dwarf star has suffered thermonuclear (nova) explosions approximately every 20 years with its previous recorded nova explosions occurring in 1890, 1902, 1920, 1944 and 1967, making it 44 years overdue for its next thermonuclear explosion. Nobody understands why it is has stopped its thermonuclear explosions.

The thermonuclear explosions are triggered by hydrogen-rich gas transferred to the white dwarf star by the very close Sun-like star. An extremely important unanswered question about such close binary stars is whether the mass receiving white dwarf continually grows in mass despite the nova explosions or decreases in mass because the nova explosions eject more mass from the white dwarf than it accumulates from the Sun-like star.

If the mass of the white dwarf in such a binary star system increases with time, then it will eventually reach the so-called Chandrasekhar Limit and will undergo instantaneous gravitational collapse resulting in an unimaginably powerful thermonuclear detonation which completely destroys the white dwarf and leaves no stellar remnant such as a pulsar (i.e., spinning neutron star) or a black hole.

This catastrophic event, known as a Type Ia supernova (or "white dwarf supernova"), releases ten million times more energy than a nova explosion or is equivalent to twenty billion, billion, billion megatons of TNT.

The Villanova team analyzed far ultraviolet spectra of T Pyxidis obtained with the International Ultraviolet Explorer spacecraft and modeled the spectra for the first time with state of the art theoretical models of accretion disks and white dwarf atmospheres.

They found that the radiation emitted by a luminous accretion disk enshrouding the white dwarf dominates the light emitted by the system but that the system is at a distance within only 1,000 parsecs (3,260 light years) which is far closer to our solar system than anyone previously thought.

The theoretical model which best matches the observed spectra corresponds to a white dwarf very close to the Chandrasekhar Limit, an orbital tilt to our line of sight of 18 degrees and a rate of mass accretion by the white dwarf of 2 x 10^17 grams/second (3 x 10^-9 solar masses/year) but the distance of the system must be less than 1,000 parsecs.

The closer distance makes the disk less luminous, the accretion rate is lower and the white dwarf mass even closer to the Chandrasekhar limit.

The closer distance means that the ejected nova shells imaged by Hubble have smaller masses than previously thought which makes them consistent with the small amount of accreted mass needed to trigger a thermonuclear explosion on a massive white dwarf.

This is extremely important because it would mean the white dwarf mass is increasing with time, NOT decreasing. If the mass of the ejected shells was greater than the mass accumulated by the white dwarf, then the white dwarf would decrease its mass with time and not become a supernova by reaching the Chandrasekhar Limit.

An interesting, if a bit scary, speculative sidelight is that if a Type Ia supernova explosion occurs within 1,000 parsecs (1 parsec = 3.26 light-years) of Earth, then the gamma radiation emitted by the supernova would fry the Earth, dumping as much gamma radiation (~100,000 ergs/square centimeter) into our planet, which is equivalent to the gamma ray input of 1,000 solar flares simultaneously.

The production of nitrous oxides in Earth's atmosphere by the supernova's gamma rays would completely destroy the ozone layer if the supernova went off within 1,000 parsecs.


TOPICS: Extended News; News/Current Events; Technical
KEYWORDS: catastrophism; explosion; gammarays; supernova; thermonuclear
Lots of conjecture and unknowns here. Still interesting, enjoy!
1 posted on 01/05/2010 4:39:09 AM PST by PeaceBeWithYou
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To: PeaceBeWithYou

Bet it goes supernova on Dec 12, 2012.....LOL.


2 posted on 01/05/2010 4:43:03 AM PST by rightwingextremist1776
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To: rightwingextremist1776

It could have already.


3 posted on 01/05/2010 4:45:43 AM PST by PeaceBeWithYou (De Oppresso Liber! (50 million and counting in Afganistan and Iraq))
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To: PeaceBeWithYou
The production of nitrous oxides in Earth's atmosphere by the supernova's gamma rays would completely destroy the ozone layer if the supernova went off within 1,000 parsecs.

I'm sure the EPA will get right on this.

4 posted on 01/05/2010 4:47:46 AM PST by Charles Martel ("Endeavor to persevere...")
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To: PeaceBeWithYou
It could have already.

Yep, could have happened back in our stone age and we still wouldn't know it.

5 posted on 01/05/2010 4:51:41 AM PST by ThePatriotsFlag (http://www.thepatriotsflag.com - The Patriot's Flag)
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To: Charles Martel

At least we could die laughing...


6 posted on 01/05/2010 4:51:55 AM PST by LRS (Just contracts; just laws; just a constitution...)
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To: PeaceBeWithYou

Champange Supernova?

http://www.youtube.com/watch?v=g3C7DECI0jU


7 posted on 01/05/2010 4:54:36 AM PST by wolfcreek (http://www.youtube.com/watch?v=Lsd7DGqVSIc)
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To: rightwingextremist1776; PeaceBeWithYou

>>>Bet it goes supernova on Dec 12, 2012.....LOL.

More likely Betelgeuse will go nova first. Red supergiant star about 600 light years away that is already seen to apparently commence its collapse into itself.

Meaning it really is in the realm of possibility to see it in our lifetimes, and more dramatically in 2012.


8 posted on 01/05/2010 4:56:25 AM PST by tlb
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To: tlb
^00 light years is a hell of a lot safer for us the 3.24 light years....should be a show ether way....let's hope it's not the last one.
9 posted on 01/05/2010 5:02:09 AM PST by rightwingextremist1776
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To: tlb

600 light years is a hell of a lot safer for us then 3.24 light years....should be a show eather way....let’s hope it’s not the last one.


10 posted on 01/05/2010 5:02:49 AM PST by rightwingextremist1776
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To: rightwingextremist1776

Watching the doomsday crap on the History Channel the other day and one of their predictions was that a supermassive black hole at the center of our galaxy would become active in 2012. They omitted the fact that it would be hundreds of thousands of years before we were affected by it if we were to be affected at all.


11 posted on 01/05/2010 5:03:40 AM PST by cripplecreek (Seniors, the new shovel ready project under socialized medicine.)
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To: rightwingextremist1776
Bet it goes supernova on Dec 12, 2012.....LOL.

In that case, it already has - 3,258 years, 11 months and 16 days ago.

12 posted on 01/05/2010 5:04:04 AM PST by SlowBoat407 (Social Justice is the goal of all liberal legislation.)
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To: tlb
More likely Betelgeuse will go nova first.

Luckily all we have to do is say its name 3 times and it will stop.

13 posted on 01/05/2010 5:04:54 AM PST by commish (Freedom tastes sweetest to those who have fought to preserve it.)
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To: rightwingextremist1776

OK...it’s 3,260 light years away not 3.26 light years...I had to re-read that....


14 posted on 01/05/2010 5:04:59 AM PST by rightwingextremist1776
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To: rightwingextremist1776
Bet it goes supernova on Dec 12, 2012.....LOL.

If it does we won't see it until the year 5,272.

Whatever we see at that distance already happened 3,260 years ago.

15 posted on 01/05/2010 5:06:18 AM PST by Cheburashka (It's a _happy_ Russian novel. Everybody still dies, but everybody dies happy.)
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To: cripplecreek
I thought the common theory was that super massive black holes are what forms our galaxy (as well as most others)....
16 posted on 01/05/2010 5:07:26 AM PST by rightwingextremist1776
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To: PeaceBeWithYou
Nobody understands why it is has stopped its thermonuclear explosions

Global Warming!


17 posted on 01/05/2010 5:10:37 AM PST by reagan_fanatic (Bush at his worst was still better than Obama at his best.)
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To: rightwingextremist1776

Bet it goes supernova on Dec 12, 2012.....LOL.

Wrong! That’s the date when the X and Gamma rays from the T-Pyxdis Type 1a supernova will hit Earth, and the planet Nibaru will return to intersect Earth’s orbit. All in all a fun day!

At least Zero’s second rein will be short...


18 posted on 01/05/2010 5:12:11 AM PST by PIF
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To: reagan_fanatic
Nobody understands why it is has stopped its thermonuclear explosions Global Warming!

Bush's fault! (makes about as much sense as the rest of the things obama and his cohorts in crime are trying to blame on former President Bush)

19 posted on 01/05/2010 5:16:56 AM PST by ThunderSleeps (obama out now! I'll keep my money, my guns, and my freedom - you can keep the change.)
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To: PeaceBeWithYou
What's all this T Pyxidis nonsense? I would bet you if you searched the International Star Registry you would find its REAL name to be Janet Jones My Sweet Pookie-poo or something like that
20 posted on 01/05/2010 5:20:33 AM PST by Mygirlsmom ($4,000 a night for the Obama vacation and all we got was a lousy terrorist attack.)
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To: rightwingextremist1776

I know that super massive black holes seem to exist at the center of every galaxy. I guess that’s what I like about these shows, I love to spot the glaring holes in the logic of the believers.

One “researcher” was claiming that the dark areas of our galaxy are areas with no stars or dust. That’s a complete and utter falsehood but I guess that’s why he has the title of “researcher” and not Doctor, astronomer, or physicist.

Another researcher claimed that the alignment of the earth, sun and black hole at the center of the galaxy would start some kind of chain reaction. He didn’t explain why an average star and a tiny planet on the outskirts of the galaxy would have this effect on a black hole hundreds of thousands of light years away.


21 posted on 01/05/2010 5:22:53 AM PST by cripplecreek (Seniors, the new shovel ready project under socialized medicine.)
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To: SunkenCiv

Over here!


22 posted on 01/05/2010 5:36:41 AM PST by FrogMom (No such thing as an honest democrat!)
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To: cripplecreek
They omitted the fact that it would be hundreds of thousands of years before we were affected by it if we were to be affected at all.

Err... It's only about 26,000 light years to the core from here so the light of any event would be viewable in about that many years from the event, but since we are in plane with the core, the jet produced from that activity wouldn't bother us.

23 posted on 01/05/2010 7:08:33 AM PST by Freeport (The proper application of high explosives will remove all obstacles.)
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To: cripplecreek

The core is only about 26,000 light years away. Other than that, I agree with your statements. These 2012 morons are exactly that...


24 posted on 01/05/2010 7:14:07 AM PST by Freeport (The proper application of high explosives will remove all obstacles.)
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To: Freeport

Too far for me to worry about. One of these night I’ll sit and write down all the holes I find in their theories. I suspect that it will fill a whole page.

I recently saw Michio Kaku on one of the news shows knocking holes in the 2012 theories. He points out that the galactic alignment isn’t even remotely rare. He said that its a once a year event. The fact that ancient people were very aware of stellar movements is really pretty much what you would expect from people living in a much darker world. No TVs, no streetlights etc.


25 posted on 01/05/2010 7:23:35 AM PST by cripplecreek (Seniors, the new shovel ready project under socialized medicine.)
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To: tlb
Betelgeuse is a freaking huge star. I've played around with it in Celestia (one of the coolest programs on the planet - and absolutely free). If you are at the distance from Betelgeuse that Pluto is from our sun, the star is still the size of a good-sized orange held at arms length.

 

26 posted on 01/05/2010 10:33:02 AM PST by zeugma (Proofread a page a day: http://www.pgdp.net/)
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To: zeugma

For later.


27 posted on 01/05/2010 10:35:17 AM PST by Lurker (The avalanche has begun. The pebbles no longer have a vote.)
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To: Mygirlsmom
Actually, for $35, ISR will name a star anything you want them to, but only they will recognize it as such.

T Pyxidis is part of the Argo Constellation.

28 posted on 01/05/2010 2:35:35 PM PST by PeaceBeWithYou (De Oppresso Liber! (50 million and counting in Afganistan and Iraq))
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To: FrogMom
Thanks FrogMom.
 
Catastrophism
 
· join · view topics · view or post blog · bookmark · post new topic · subscribe ·
 

29 posted on 01/05/2010 4:09:54 PM PST by SunkenCiv (Happy New Year!)
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The Cycle of Cosmic Catastrophes: Flood, Fire, and Famine in the History of Civilization The Cycle of Cosmic Catastrophes:
Flood, Fire, and Famine
in the History of Civilization

by Richard Firestone,
Allen West, and
Simon Warwick-Smith


30 posted on 01/05/2010 4:12:00 PM PST by SunkenCiv (Happy New Year!)
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To: tlb

True, but they are two different types. Betelgeuse will be a Type II supernova, where a red giant collapses, explodes, and becomes a neutron star or black hole. t Pyxidis will be a Type Ia, caused by material from a companion striking a white dwarf (dead star) and essentially re-activating it. Type Ia have very similar properties to one another, and are used as known sources to measure distances to galaxies. If T Pyxidis does go nova, it will offer a great test to the theory that Type Ia supernovae are all “alike.”


31 posted on 01/21/2010 6:55:47 PM PST by MikeD (We live in a world where babies are like velveteen rabbits that only become real if they are loved.)
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