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Type Ia Supernova

Type Ia Supernova. Jeff Cummings Astronomy 232 December 17th. Introduction. I will be talking about the study of Type Ia supernova (These will now be referred to as SN Ia). What leads to there formation. What we have learned from them, and what we can learn from them in the future.

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Type Ia Supernova

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  1. Type Ia Supernova Jeff Cummings Astronomy 232 December 17th

  2. Introduction • I will be talking about the study of Type Ia supernova (These will now be referred to as SN Ia). • What leads to there formation. • What we have learned from them, and what we can learn from them in the future. • What uncertainties are still involved with SN Ia. • Questions.

  3. Formation of SN Ia • Very close binary system of low mass stars. • One star dies becoming a white dwarf. • The second star becomes a red giant, because of close proximity mass on surface of red giant is pulled towards the white dwarf. • When white dwarf surpasses 1.4 MSUN it becomes unstable and a supernova occurs.

  4. How They Are Used In Research • Since SN Ia form from white dwarfs of the same mass, they should have the same luminosity. • Therefore they are exceptional standard candles of extremely high luminosity.

  5. What Has Been Discovered? • Observations of distant SN Ia have shown that they are fainter than they should be with their measured red shifts. • This has led to the theory of the universe accelerating in expansion rate. • Recent results have shown the farthest observed SN Ia is brighter than expected, which means the universe was decelerating when it was younger. • Deceleration is caused by gravity, and acceleration is caused by an unknown “dark energy.”

  6. Uncertainties • Differing metalicity of stars from billions of years ago to stars from today might lead to differing SN Ia luminosities. • Differing ignition points inside the white dwarf would also lead to differing luminosities. • 3D simulations are being done to discover how much these differences affect the luminosities. • With a greater understanding of these minor luminosities shifts they possibly can be corrected for.

  7. Conclusion • SN Ia are great tools that can possibly be used to measure distances accurately. • Once a greater understanding of SN Ia is developed they can be used to accurately measure cosmological constants. • Distance to objects is extremely important in astronomy, with a standard candle of this luminosity many answers to our questions of today could be found.

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