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
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.
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
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.
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.
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).
Red squares indicate pipeline features not used during the original processing. 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)
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
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)
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
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
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
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
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)
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!