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The Kepler/K2 Supernova Cosmology Experiment

The Kepler/K2 Supernova Cosmology Experiment

Talk presented at ESA's 2018 XMM-Newton Science Workshop in Madrid on June 15th, 2018.

Geert Barentsen

June 15, 2018

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  1. Geert Barentsen (@GeertHub)
    The Kepler/K2 Supernova Experiment
    Geert Barentsen
    Kepler/K2 GO Director

    NASA Ames Research Center
    [email protected]

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  2. Geert Barentsen (@GeertHub)
    Over the past year, the Kepler Space Telescope has
    monitored over 50,000 galaxies using uninterrupted,
    high-precision, high-cadence optical photometry.
    This public data set is known to include at least

    40 supernovae which await analysis.

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  3. Kepler was launched on March 6, 2009
    0.95-m Schmidt
    100 Mpixel array (100 deg2)

    1 or 30 min cadence
    wide passband (V+R+I)

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  4. Kepler’s prime mission observed a single
    field in Cygnus from 2009 through 2013

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  5. Since 2014, Kepler visits a new field
    every 3 months
    This is called the K2 Mission

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  6. Geert Barentsen (@GeertHub)
    K2’s science has been diverse
    and community-led
    • Planets around bright and nearby stars

    ex. GJ 9827, TRAPPIST-1.
    • Rotation and activity in young and old star clusters

    ex. Taurus, Pleiades, Beehive, Lagoon Nebula, M67.
    • Hundreds of pulsating White Dwarfs and Cataclysmic Variables

    => continuous monitoring across 80-day periods

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  7. Geert Barentsen (@GeertHub)
    Evidence for a Quasi-Periodic Oscillation in the
    Kepler light curve of an active galaxy (Smith+ 2018)
    => The frequency is thought to be predictive of black hole mass.

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  8. Geert Barentsen (@GeertHub)
    In 2015, Kepler caught a supernova with a Type Ia shape,
    but a rise time 10x faster than other Type Ia’s
    (Rest+ 2018)

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  9. Geert Barentsen (@GeertHub)
    Despite Type Ia supernovae being used to discover the
    accelerating expansion of the Universe, we still do not
    understand the nature of the progenitor system, e.g.
    • White Dwarf accreting from a companion?

    (single degenerate scenario)
    • Merger of two White Dwarfs?

    (double degenerate scenario)
    Do multiple scenarios lead to SN Ia’s?

    In what proportion?!

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  10. *
    Observational tests for the single degenerate scenario
    arise from the fact that the companion is struck by
    ejecta from the supernova shortly after the explosion
    Animation: NASA/JPL-Caltech

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  11. Geert Barentsen (@GeertHub)
    During Kepler’s original mission, three
    Type Ia SN were observed. (Olling+ 2015)
    Result: none showed excess flux in the
    early-rise lightcurve.
    Were they all double degenerate
    progenitors, or single degenerate
    systems with a particular line of sight?
    The K2 Supernova Experiment aims
    to increase the sample ten-fold.

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  12. Geert Barentsen (@GeertHub)
    Dec 2017 - May 2018: “K2 Supernova Experiment”
    => Kepler studied 50,000 galaxies in two fields across 6 months,
    accompanied by multi-color monitoring from the ground.

    (Including PanSTARRS and ASASSN.)

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  14. http://lightkurve.keplerscience.org
    We recently released new Python tools and
    tutorials for Kepler data analysis

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  15. Geert Barentsen (@GeertHub)
    Kepler’s recent surveys of galaxies is
    able to add a new dimension to the
    study of high energy transients.
    The data are public and await analysis;
    including Supernovae, AGN, and CVs.
    Significant opportunities exist for future
    exoplanet transit surveys!

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  16. Geert Barentsen (@GeertHub)

    [email protected]


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