Supernova - Part 3

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This presentation is about Supernova Expansion and Explosion

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Supernova - Part 3

  1. 1. Supernova R. Sri Madhavi
  2. 2. What is Supernova? <ul><li>Supernova is a celestial body </li></ul><ul><li>Supernova is actually a stellar explosion </li></ul><ul><li>The term, “Supernova” was coined in 1926 by a Swedish astrophysicist, Fritz Zwicky </li></ul>
  3. 3. What is the meaning of Supernova? <ul><li>A very bright new star shining in the celestial sphere </li></ul>
  4. 4. How often does a Supernova occur? <ul><li>About once in 50 years </li></ul><ul><li>It happens in the galaxy </li></ul><ul><li>Its size is about the size of the milky way </li></ul>
  5. 5. What is the importance of Supernova? <ul><li>Supernova plays a significant role in enriching the interstellar medium with higher mass elements </li></ul><ul><li>the expanding shock waves from supernova explosions can trigger the formation of new stars </li></ul>
  6. 6. Types of Supernova <ul><li>There are two common types of Supernova: </li></ul><ul><li>Ia </li></ul><ul><li>II </li></ul>
  7. 7. Type Ia Supernova <ul><li>This supernova is the result of the activity of a couple of stars; one of which is a type of star known as “White Dwarf” </li></ul><ul><li>White dwarf is a star rich in carbon and oxygen. </li></ul>
  8. 8. Type Ia Supernova <ul><li>The “White Dwarf” absorbs matter from the companion and therefore its mass increases, </li></ul><ul><li>When the density of the core of the White Dwarf reaches a critical density of 2 x 10 9 g/cm 3 </li></ul><ul><li>carbon and oxygen undergo fusion uncontrollably, and therefore the star explodes </li></ul>
  9. 9. Type II Supernova <ul><li>This occurs in a star which is in the verge of death </li></ul><ul><li>At this point of time, there is no fuel in the star to burn, and there is so much accumulation of iron inside the star. </li></ul><ul><li>Due to the weight of iron, the star fragments and collapses </li></ul>
  10. 10. Mechanism of Supernova Ia
  11. 11. Mechanism of supernova: Onion Layers
  12. 12. Mechanism of Supernova
  13. 13. Other Types <ul><li>Other types of Supernova are: </li></ul><ul><li>Ib </li></ul><ul><li>Ic </li></ul><ul><li>IIP IIL </li></ul>
  14. 14. What happens when Supernova occurs? - 1 <ul><li>A supernova can radiate as much energy as the Sun could emit over its life span. </li></ul>
  15. 15. What happens when Supernova occurs? -2 <ul><li>The explosion expels star's material at a velocity of up to 30,000 km/s (a tenth the speed of light ) </li></ul>
  16. 16. What happens when Supernova occurs? -3 <ul><li>The material coming out of a Supernova produces a shock wave into the surrounding interstellar medium . </li></ul><ul><li>This shock wave sweeps up an expanding shell of gas and dust called a supernova remnant . </li></ul>

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