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Kepler/K2 Status Update & New Software Tools

Kepler/K2 Status Update & New Software Tools

A talk presented by Geert Barentsen (NASA Ames) 
at #TASC4/#KASC11 in Aarhus, Denmark, on July 9, 2018.

Geert Barentsen

July 09, 2018

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  1. Kepler/K2 update &
 new software tools A talk presented by

    Geert Barentsen (@GeertHub)
 at KASC11 in Aarhus, Denmark, on July 9, 2018 Cartoon by Christina Hedges
  2. At present, 2.1 publications per day use Kepler or K2

    data Photo credit: motorverso.com (cc-by) 2016: 1.2 per day 2013: 0.8 per day 2010: 0.2 per day
  3. The distribution of planet radii is bimodal Photoevaporation appears to

    herd small planets into either bare cores or mini-Neptunes.
 Fulton+ 2017 Owen & Wu 2017 and others
  4. Atmospheric erosion appears to be a function of incident flux

    High-precision planet radii obtained via asteroseismology reveal a slope in the planet radius bimodality.
 Van Eylen+ 2017 See talks by Thompson, Lundkvist, Montet, Kjeldsen, Chaplin, Huber, Chontos, and others.
  5. The number of planets discovered across open clusters is starting

    to constrain the timescales of inward planet migration. Rizzuto+ in prep Mann+ 2017 and others 1 10 100 1000 Age (Myr) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 Relative Planet Occurence (P < 20 d) Migration? Kepler Upper Scorpius Pleiades Hyades & Praesepe Close-in planets appear to be less common around young stars
  6. Late M-dwarfs spin down
 in a radically different way Also:

    Rebull+ 2016a,b, 2017,
 Somers+ 2017,
 Barnes+ 2016,
 Stauffer+ 2016,
 Nardiello+ 2015,
 Scholz+ 2015,
 and others.
  7. Model prediction: Matt et al. (2015), 653 Myr Late M-dwarfs

    spin down
 in a radically different way Also: Rebull+ 2016a,b, 2017,
 Somers+ 2017,
 Barnes+ 2016,
 Stauffer+ 2016,
 Nardiello+ 2015,
 Scholz+ 2015,
 and others.
  8. Transients can have the shape of a Type Ia SN

    but show a rise time of just 2 days The median rise time of Type Ia SN is ~17 days?! 
 Rest+ 2018
  9. These results were all published within the past year …

    nine years after Kepler’s launch!
  10. The number of targets with Kepler data increased by 30%

    over the past year +150,000 targets K2 observed 2,065 targets in 1-minute cadence so far;
 564 are bright (Kp < 10).
  11. Red squares indicate pipeline features not used during the original

 cf. https://keplerscience.arc.nasa.gov/k2-uniform-global-reprocessing-underway.html K2’s re-processing will ensure that all Campaigns benefit from a high-quality, uniform calibration Work led by Jeff Coughlin (@JeffLCoughlin)
  12. Campaign 20 plans to target Taurus-Auriga
 and the Hyades cluster

    region Target proposal deadline:
 July 19, 2018 Aug 16, 2018 Details: https://keplerscience.arc.nasa.gov
  13. K2 has observed two dozen clusters across all ages •

    Young open clusters (1-10 Myr)
 Taurus, Upper Sco, rho Ophiuchus, Lagoon (NGC 6530). • Moderately young open clusters (0.1-1 Gyr)
 Pleiades, Hyades, M35, M44 (Beehive), NGC 1647, NGC 1746, NGC 1750, NGC 1758, NGC 1817. • Middle-aged clusters
 M67, Ruprecht 147, NGC 2158. • Globular clusters
 M4, M9, M19, M80, Terzan 5.
 NGC 5897, NGC 6293, NGC 6355. Campaigns 5, 16, & 18 overlap
 => M67 & M44 were observed for 3 x 80 days (3-yr baseline)
  14. See talks by Brown, Hall, Huber, Martig, Pedersen, and others.

    GAIA! Photo by Sebastian Davenport on unsplash.com
  15. Probabilistic measurements of asteroseismic parameters in the time domain are

    becoming computationally tractable.
 Foreman-Mackey+ 2017
 Ambikasaran+ 2015 + talk by Pereira Opportunity: who wants to trial this method on K2’s 2,000 short cadence targets? Gaussian Processes
  16. Creative use of pixels in the PSF wings of bright

    stars enables the investigation of bright stars, including OB- type supergiants. 
 Pope+ 2016 White+ 2017 Aerts+ 2017 Aerts+ 2018 See talks by White & Aerts HD 188209 (O9.5Iab) rho Leo (B1Iab) Creative analyses enable the study of stars brighter than ~5th magnitude
  17. The intra-pixel response function of Kepler’s CCDs is being measured

    to an unprecedented precision A new measurement apparatus was designed which uses small spots of light across a range of wavelengths. 
 Vorobiev+ in prep => opens the door towards high-precision PSF-fitting photometry with Kepler
  18. The field is getting ever better at leveraging machine learning

    Careful feature engineering allows a classifier to provide a complete and unbiased census of different types of stars.
 Hedges+ 2018 and others
  19. http://lightkurve.keplerscience.org/tutorials/2.09-how-to-use-lightkurve-for-asteroseismology.html Our latest tutorial demonstrates how you can investigate the

    dependency of a periodogram on aperture mask and detrending parameters Work led by Christina Hedges (@TheChedgehog)
  20. Ann Marie Cody Michael Gully-Santiago Christina Hedges Zé Vinícius https://github.com/KeplerGO/lightkurve

    Everyone is welcome to join the development and become a co-author on the lightkurve paper!
  21. While Kepler’s fuel is running low, the space photometry revolution

    is only just getting started! 
 Try lightkurve today at
 https://keplerscience.arc.nasa.gov/lightkurve Cartoon by Christina Hedges
  22. KEPLER&K2 SciConV: 2019 10 years since launch March 4 –

    8, 2019 Glendale, CA Abstracts due Nov 15, 2018