Simulations uncover why some supernova explosions produce so much manganese and nickel

September 27, 2018, University of Tokyo
Figure 1: An artist's conception of a single-degenerate Type Ia supernova scenario. Due to the stronger gravitational force from the white dwarf on the left, the outer material of the bigger, slightly evolving main-sequence star on the right is torn away and it flows onto the white dwarf, eventually increasing the mass of the white dwarf toward the Chandrasekhar mass. This carbon-oxygen white dwarf will later explode as a Type Ia supernova. Credit: Kavli IPMU

Researchers have found white dwarf stars with masses close to the maximum stable mass (called the Chandrasekhar mass) are likely to produce large amounts of manganese, iron, and nickel after they orbit another star and explode as Type Ia supernovae.

A Type Ia supernova is a thermonuclear explosion of a carbon-oxygen white dwarf star with a companion star orbiting it, also known as a binary system. In the universe, Type Ia supernovae are the main production sites for iron-peak elements, including , iron, and nickel, and some intermediate mass elements including silicon and sulfur.

However, researchers today cannot agree on what kind of binary systems triggers a white dwarf to explode. Moreover, recent extensive observations have revealed a large diversity of nucleosynthesis products, the creation of new atomic nuclei from the existing nuclei in the star by nuclear fusion, of Type Ia supernovae and their remnants, in particular, the amount of manganese, stable nickel, and radioactive isotopes of 56-nickel and 57-nickel.

To uncover the origin of such diversities, Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU) Project Researcher Shing-Chi Leung and Senior Scientist Ken'ichi Nomoto carried out simulations using the most accurate scheme to date for multi-dimensional hydrodynamics of Type Ia supernova models. They examined how chemical abundance patterns and the creation of new atomic nuclei from existing nucleons depend on white dwarf properties and their progenitors.

Figure 2: The colour plot of the temperature distribution of the benchmark Type Ia supernova model at about 1 second after explosion. The deflagration model with deflagration-detonation transition is used to produce this result. Credit: Leung et al
"The most important and unique part of this study is that this is so far the largest parameter survey in the parameter space for the Type Ia supernova yield using the Chandrasekhar mass white dwarf," said Leung.

A particularly interesting case was the supernova remnant 3C 397. 3C 397 is located in the Galaxy about 5.5 kpc from the center on the galactic disk. Its abundance ratios of stable manganese/iron and nickel/iron were found to be two and four times that of the Sun respectively. Leung and Nomoto found the abundance ratios among manganese, and are sensitive to white dwarf mass and metallicity (how abundant it is in elements heavier than hydrogen and helium). The measured values of 3C 397 can be explained if the white dwarf has a mass as high as the Chandrasekhar mass and high metallicity.

The results suggest remnant 3C 397 could not be the result of an explosion of a white dwarf with relatively low mass (a sub-Chandrasekhar mass). Moreover, the white dwarf should have a metallicity higher than the Sun's metallicity, in contrast to the neighboring stars which have a typically lower metallicity.

Figure 3: Distributions of representative elements ejecta velocity in the typical Type Ia supernova after all major nuclear reactions have ended. Colours represent the sites where the corresponding elements are produced. The arrow indicates the motion of ejecta’s. Credit: Leung et al.

It provides important clues to the controversial discussion of whether the mass of the white dwarf is close to the Chandrasekhar mass, or sub-Chandrasekhar , when it explodes as a Type Ia supernova.

Figure 4: The 57Ni against 56Ni for the models presented in this work. The observed data from Type Ia supernova SN 2012cg is also included. The data points along the line in the described direction stand for white dwarf models of masses from 1.30 to 1.38 solar mass respectively. Credit: Leung et al.

The results will be useful in future studies of chemical evolution of galaxies for a wide range of metallicities, and encourage researchers to include super-solar metallicity models as a complete set of stellar models.

Leung says the next step of this study would involve further testing their model with more observational data, and to extend it to another subclass of Type Ia supernovae.

Figure 5: X-ray, optical & infrared composite image of 3C 397. Credit: X-ray: NASA/CXC/Univ of Manitoba/S.Safi-Harb et al, Optical: DSS, Infrared: NASA/JPL-Caltech

These results were published in the July 10 issue of the Astrophysical Journal.

Figure 6: Mass ratio Mn/Fe against Ni/Fe for the models presented in this work. The observed data from Type Ia supernova remnant 3C 397 is also included. The data points along the line in the described direction stand for white dwarf models of masses from 1.30 to 1.38 solar mass respectively. Credit: Leung et al.

Explore further: After the Kepler supernova explosion, no survivors were left behind

More information: Shing-Chi Leung et al. Explosive Nucleosynthesis in Near-Chandrasekhar-mass White Dwarf Models for Type Ia Supernovae: Dependence on Model Parameters, The Astrophysical Journal (2018). DOI: 10.3847/1538-4357/aac2df

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wduckss
1 / 5 (6) Sep 28, 2018
Interesting! The authors investigate at about 5.5 kpc distance and make a conclusion. At the same time, authors do not see the difference in the chemical composition of Earth and the Sun. Most of the bodies in the orbit have a higher percentage of metal than Sun.
If authors do not see this, how can we believe (in their) results in about 5.5 kpc.
Science is the observation of the whole. Science is not observing the fragments of the whole (without observing the whole).
Everything (about the article) speaks "are likely to produce large amounts of manganese, iron, and nickel after they orbit another star and explode""
rrwillsj
1 / 5 (4) Sep 28, 2018
oh dear duck. Do you understand that when Our Sun and the surrounding protoplanetary disk of cosmic crap began to materialize?

That out of the prevenient moshpit of supernovae, Sol got a different set of elements than what separately coalesced as the surrounding junkyard disk from the leftovers in the chaotic nebulae.

The elemental materials that make up the planets did not get birthed from Sol.

Cause that'd make the Sun a female fertility goddess. And Judea-Cristian-Sunni-Han civilization would come crashing down at such a horror being possible!

While those fuckung Japs would be enjoying themselves. Snickering as they watch our societies collapse.
Surveillance_Egg_Unit
2.3 / 5 (6) Sep 28, 2018
rrwillsj
Obfuscation much with regards to your nasty-nasty?

Societies collapse out of the choices made by those who believe themselves to be the Elite, or have a membership in it.
In some circles here in the States, the term "Japs" is a euphemism for "Jewish-American-Princess(es)".
But, who knows? They just might be snickering at the coming collapse of society once the Democrats win both Houses of Congress this coming November.

But IF and when that happens, we can all kiss US scientific research goodbye, for that funding will have to meet the Democratic Socialist projects to provide sustenance of every kind for all of the illegals who are here in the States already, and all of those who are yet to arrive.

And when Socialism fails, the Snowflakes will cry again while demanding puppies and toys to soothe their mental booboos. I can almost predict that they will demand the return of Barry Obama as US President.
wduckss
1 / 5 (3) Sep 29, 2018
Which part does not you understand: the formation of a body due to the collapse of the gas cloud or the formation of a body as a result of constant growth (gathering)?
...
Perhaps your Sun originates from one supernova and bodies from the other? Maybe every body came from another cloud and other supernovae?
I almost forgot: the chemical composition of the gas clouds is similar (or less varied) to the chemical composition of the stars.
According to your science, the planets and other bodies are complete aliens in our system.
Forming a body does not depend on elections for the Senate. The votes can not change the evidence.
https://www.svemi...tructure
Surveillance_Egg_Unit
3 / 5 (6) Sep 29, 2018
@ducks
There is also a possibility that there was a supermassive Star long before our Sun came into existence. The supermassive Star, after using up all of its fuel exploded as a superdupernova and the planetary bodies that had been orbiting that Star were all sent flying into our location. Those planetary bodies floated around and some collided with each other since they had no permanent orbits yet.
Then the disk of dust and gas began to compress, causing temperatures to rise which, in their turn, began to cause a chain reaction in the radioactive dust/gas such as molecules of Uranium and Deuterium, etc, which then resulted in the highest temperatures for Fusion to begin in Hydrogen gas. That is when the Sun was born.
The planetary bodies that had been kicked out of their normal orbits then, due to the influence of the new Sun, began to make new orbits around the Sun.
Therefore, Earth was already in its new location - stationary, and when the Sun was created, Earth orbited it
rrwillsj
1 / 5 (3) Sep 29, 2018
well segue, I have discussed the pretentious nonsense of you altright fairytails with my father's kinfolk.

The general consensus seems to be? That mu family owes the American Nation an apology. For our great-greats accepting the bribes from your gramps. Letting you foreign scum sneak into our country.

I agree that you unnatural illegals should be rounded-up and shipped back to your ancestral cess-pits.

You can resume your heritage as honey-pot collectors and pulling the plow on your divinely-ordained master's fields.

Certainly help clear out the miasma stench of treason and sedition that follows you about.
wduckss
1 / 5 (2) Sep 29, 2018
Nice comment, but unfortunately beyond the evidence. Only part of "some collided with each other" can be realistic (within the constant growth of the body).

"Star temperature
Star.........Type...Mass Sun=1...Temperature °K
WR 2, ...WN4-s..16................141.000
μ Columbae..O...16..................33.000
Deneb..........A....19....................8.525
Gamma Cassiopeiae..B..17.....25.000
VY Canis Majoris..M........17......3.490
DH Tauri b..Planet; dist. 330 AU.....12 M Jupiter...2.750
HIP 78530 b..Planet; dist. 740 AU..24 M Jup........2.700 (2.800)
NML Cygni...M....50...................3.834"
https://www.svemi...Universe
Surveillance_Egg_Unit
3.4 / 5 (5) Sep 29, 2018
Alternatively, ducks, none of you really exist and are only a figment of my imagination.

:))

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