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Explosions in the sky

federica
July 18, 2019

Explosions in the sky

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

federica

July 18, 2019
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  1. @fedhere
    Federica B. Bianco
    University of Delaware
    LSST Science Collaborations
    Explosions in the sky

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  2. @fedhere
    1572
    SN Tycho
    in Scania, Denmark,
    Tycho Brahe first
    observed a "new star"
    on November 11, 1572.
    From Flammarion's
    Astronomie Populaire
    (1880)

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  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)

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  4. @fedhere
    (possibly) supernova of
    A.D. 1006 and the
    constellation Scorpius
    White Tanks Regional
    Park, Phoenix, AZ.
    SN1006

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  5. @fedhere
    (possibly) supernova of
    A.D. 1006 and the
    constellation Scorpius
    White Tanks Regional
    Park, Phoenix, AZ.
    SN1006

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  6. @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

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  7. @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]

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  8. @fedhere
    10 stars explode every second
    A. Connolly, TED talk

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  9. @fedhere
    1
    Stars have lives!
    They are born, they grow old, and they die

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  10. @fedhere
    gravity is pushing the star inward

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  11. @fedhere
    gravity is pushing the star inward
    Nuclear reactions push the star outward

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  12. @fedhere
    gravity is pushing the star inward
    Nuclear reactions push the star outward
    H->He->C->N->O->…Fe
    Hydrostatic
    equilibrium

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  13. @fedhere
    gravity is pushing the star inward
    Nuclear reactions push the star outward
    H->He->C->N->O->…Fe
    Hydrostatic
    equilibrium

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  14. @fedhere
    gravity is pushing the star inward
    Nuclear reactions push the star outward

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  15. @fedhere
    2
    Just like stars in Hollywood :
    the biggest stars live fast and
    die young and spectacularly

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  16. @fedhere
    high initial mass
    low initial mass
    low mass….. boring death by cooling down

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  17. @fedhere
    high initial mass
    High mass….. Explosive death!

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  18. @fedhere
    high initial mass
    low initial mass but in a multiple system
    Low mass binaries….. Explosive death!

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  19. @fedhere
    high initial mass
    low initial mass but in a multiple system
    Low mass binaries….. Explosive death!

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  20. @fedhere
    Reasons to study Supernovae
    umbnails/image/g299.jpg

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  21. @fedhere
    Reason I to study Supernovae
    umbnails/image/g299.jpg
    natures fireworks that leave awesome remnants!

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  22. @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

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  23. @fedhere
    they are different and mostly we don’t know why
    Reason III to study Supernovae

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  24. @fedhere
    SN 2011dh, M51
    vanDyk et al. 2011

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  25. @fedhere
    “the SN progenitor problem”

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  26. @fedhere
    Wavelength
    SN observables
    time
    https://www.youtube.com/watch?v=alAQqzlB-O8

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  27. @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

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  28. @fedhere
    3
    The Universe is
    expanding

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  29. @fedhere
    everything is getting farther away from everything

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  30. @fedhere
    Doppler effect

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  31. @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

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  32. @fedhere
    If we know how bright,
    then we can measure how far

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  33. @fedhere
    time
    luminosity
    A special type of Supernova: SN Ia
    S. Perlmutter,
    A.Reis, B. Schmidt

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  34. @fedhere
    time
    luminosity
    Rest+ 2014
    A special type of Supernova: SN Ia
    Luminosity <-> DISTANCE
    Redshift <-> VELOCITY

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  35. @fedhere
    The Universe is
    expanding

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  36. @fedhere
    4
    The Universe is
    expanding Faster and Faster!

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  37. @fedhere
    Stellar explosions rule!!

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