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Phosphorus in the young supernova remnant Cassiopeia A
Bon-Chul Koo1, Yong-Hyun Lee, Dae-Sik Moon
1Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea.
Science (New York, N.Y.)
|December 17, 2013
Summary
Supernovae (SNe) create phosphorus, an element vital for life. Observations of Cassiopeia A reveal phosphorus-to-iron ratios up to 100 times higher than the Milky Way average, confirming SN production.
Area of Science:
- Astronomy
- Astrophysics
- Nuclear Astrophysics
Background:
- Phosphorus (P) is essential for life and believed to be synthesized in massive stars.
- Supernovae (SNe) are hypothesized to disperse synthesized phosphorus into interstellar space.
Purpose of the Study:
- To investigate the origin of phosphorus by analyzing its abundance in supernova remnants.
- To confirm the role of supernovae in phosphorus nucleosynthesis.
Main Methods:
- Near-infrared spectroscopic observations of the Cassiopeia A supernova remnant.
- Abundance ratio analysis of phosphorus (P) to iron (Fe) in SN material.
Main Results:
- The phosphorus-to-iron ratio in Cassiopeia A ejecta is up to 100 times the Milky Way average.
- This finding confirms that supernovae produce phosphorus.
- Observed ratios align with nucleosynthetic models but contradict complete mixing scenarios.
Conclusions:
- Massive stars exploding as supernovae are confirmed as a significant source of phosphorus.
- The observed abundance ratios provide constraints on supernova explosion and mixing dynamics.
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