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Exploring the Neutron Star探索中子星
Jia Liu 刘佳Gesamtkunstwerk 1020
2012 - 04 - 20
Stellar Evolution
Kepler's Supernova, SN 1604
Credit: NASA/ESA/JHU/R.Sankrit & W.Blair
Kepler's Supernova, SN 1604
Credit: NASA/ESA/JHU/R.Sankrit & W.Blair
The Crab Nebula, SN 1054
Credit: NASA/ESA/ASU/J.Hester & A.Loll
《宋史·天文志-第九》对蟹状星云的记载
The Crab Nebula, SN 1054
Credit: Optical: NASA/ESA/ASU/J.Hester & A.Loll; X-ray: NASA/CXC/ASU/J.Hester et al.
Mass of a Neutron Star
Earth Mass6 × 1024 kg
Solar Mass2 × 1030 kg
Mass of Neutron Star~ 1.35 - 2 Solar mass
The Size of a Neutron Star
~ The size of Manhattan
Neutron Star is Very Very ... Dense!
The density of neutron star is equivalent to the mass of the entire
human population compressed to the size of a sugar cube.
7 Billion
Conservation of Angular Momentum
7 Billion
Similarly, changing from the size of the Sun to the size of Manhattan (while keeping its mass) makes neutron star spin very fast.
Neutron Star Spins Very Very ... Fast!
7 Billion
Earth Period1 day (86,400 seconds)
Neutron Star Period~ 0.01 seconds
.
The Microscopic World
MoleculesAtoms
NucleusQuarks
Proton
Neutron
Fundamental physics question: How matter behaves in extremely dense environment?
Neutron Star as A Laboratory
How matter behaves in extremely dense environment (nuclei density)? We are unable to create such dense environment in any laboratories on Earth, so Neutron star, where we can observe the densest matters in our Universe, become our lab in the sky.
Neutron Star as One Giant Neutron
The key question to answer: What is the mass - radius relation for neutron star?
Mass - Radius Relation
But it's difficult to measure the mass and radius of a neutron star, because they're only as big as Manhattan, but hundreds of light years away. It's like to measure the size of an atom in California from New York!
My Research: Simulating Neutron Star Atmosphere
RXTE Space Telescope
My Research: Simulating Neutron Star Atmosphere
Simulation run11.75 layer 0
We are learning more and more about neutron stars, However," This is not the end. It is not even the beginning of the end. But it is, perhaps, The end of the beginning. "- Sir Winston Churchill
My Research: Simulating Neutron Star Atmosphere
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