Explosions in the sky

outreach talk about why explosions in the sky rule! #supernova #astrophysics

Transcript

1. @fedhere Federica B. Bianco University of Delaware LSST Science Collaborations Explosions in the sky
2. @fedhere
3. @fedhere 1572 SN Tycho in Scania, Denmark, Tycho Brahe first observed a "new star" on November 11, 1572. From Flammarion's Astronomie Populaire (1880)
4. @fedhere 1572 SN Tycho in Scania, Denmark, Tycho Brahe first observed a "new star" on November 11, 1572. From Flammarion's Astronomie Populaire (1880)
5. @fedhere (possibly) supernova of A.D. 1006 and the constellation Scorpius White Tanks Regional Park, Phoenix, AZ. SN1006
6. @fedhere (possibly) supernova of A.D. 1006 and the constellation Scorpius White Tanks Regional Park, Phoenix, AZ. SN1006
7. @fedhere In the 2nd year of the epoch Zhongping, the 10th month, on the day Kwei Hae [December 7, Year 185], a 'guest star' appeared in the middle of Nan Mun [Alpha Centauri], The size was half a bamboo mat. It displayed various colors, and gradually lessened. In the 6th month of the succeeding year it disappeared. [4] 《後漢漢書·卷⼗十⼆二·天⽂文下》："中平⼆二年年⼗十⽉月癸亥，客星出南⾨門中，⼤大如半 筵，五⾊色喜怒怒稍⼩小，⾄至後年年六⽉月消。占⽈曰：‘為兵。’⾄至六年年，司隸校尉袁 紹 誅滅中官，⼤大將軍 部曲將 吳匡 攻殺 ⾞車車騎將軍 何苗，死者數數千⼈人。" SN 185
8. @fedhere SN 185 In the 2nd year of the epoch Zhongping, the 10th month, on the day Kwei Hae [December 7, Year 185], a 'guest star' appeared in the middle of Nan Mun [Alpha Centauri], The size was half a bamboo mat. It displayed various colors, and gradually lessened. In the 6th month of the succeeding year it disappeared. [4]
9. @fedhere 10 stars explode every second A. Connolly, TED talk
10. @fedhere 1 Stars have lives! They are born, they grow old, and they die
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12. @fedhere gravity is pushing the star inward
13. @fedhere gravity is pushing the star inward Nuclear reactions push the star outward
14. @fedhere gravity is pushing the star inward Nuclear reactions push the star outward H->He->C->N->O->…Fe Hydrostatic equilibrium
15. @fedhere gravity is pushing the star inward Nuclear reactions push the star outward H->He->C->N->O->…Fe Hydrostatic equilibrium
16. @fedhere gravity is pushing the star inward Nuclear reactions push the star outward
17. @fedhere 2 Just like stars in Hollywood : the biggest stars live fast and die young and spectacularly
18. @fedhere high initial mass low initial mass low mass….. boring death by cooling down
19. @fedhere high initial mass High mass….. Explosive death!
20. @fedhere high initial mass low initial mass but in a multiple system Low mass binaries….. Explosive death!
21. @fedhere high initial mass low initial mass but in a multiple system Low mass binaries….. Explosive death!
22. @fedhere Reasons to study Supernovae umbnails/image/g299.jpg
23. @fedhere Reason I to study Supernovae umbnails/image/g299.jpg natures fireworks that leave awesome remnants!
24. @fedhere “The nitrogen in our DNA, the calcium in our teeth, the iron in our blood, the carbon in our apple pies were made in the interiors of collapsing stars. We are made of starstuff.” ― Carl Sagan, Cosmos Reason II to study Supernovae we are made of star dust
25. @fedhere they are different and mostly we don’t know why Reason III to study Supernovae
26. @fedhere SN 2011dh, M51 vanDyk et al. 2011
27. @fedhere “the SN progenitor problem”
28. @fedhere Wavelength SN observables time https://www.youtube.com/watch?v=alAQqzlB-O8
29. @fedhere We can see them really far away, and they are are really good at telling us about how the Universe works Reason IV to study Supernovae
30. @fedhere 3 The Universe is expanding
31. @fedhere everything is getting farther away from everything
32. @fedhere Doppler effect
33. @fedhere If we know the frequency, then we can measure how fast its moving Doppler effect low light frequency (red) High light frequency (blue) Redshift
34. @fedhere If we know how bright, then we can measure how far
35. @fedhere time luminosity A special type of Supernova: SN Ia S. Perlmutter, A.Reis, B. Schmidt
36. @fedhere time luminosity Rest+ 2014 A special type of Supernova: SN Ia Luminosity <-> DISTANCE Redshift <-> VELOCITY
37. @fedhere The Universe is expanding
38. @fedhere 4 The Universe is expanding Faster and Faster!
39. @fedhere Stellar explosions rule!!