white dwarfs from space with help from Boris Gänsicke, Steve Kawaler, Sandra Greiss, Pier-Emmanuel Tremblay, Nicola Pietro Gentile Fusillo, Roberto Raddi, Keaton J. Bell, Erik Dennihy, Bart Dunlap, Chris Clemens, Mike Montgomery, Don Winget, Tom Marsh, Seth Redfield, Mukremin Kilic, Matt Burleigh, Ian Braker, Stéphane Charpinet, Noemi Giammichele, Judi Provencal, et al.
All K2 selection was done without Gaia DR2 (Hundreds more candidate WDs were observed by programs led by Matt Burleigh, Steve Kawaler, Mukremin Kilic, John Lewis, and Seth Redfield but turned out to be non-WDs) JJ Hermes, Boston University | IAU 357: WD Tracers | 2 2212 unique WDs with long- cadence (30-min) exposures: 7.1 million frames 572 unique WDs with short- cadence (1-min) exposures: 61.5 million frames All numbers up to Campaign 18
showed a significant peak in FT at 3 ppt = 0.3% 5 hr 2 hr 1 hr SDSS ν Nyq JJ Hermes, Boston University | IAU 357: WD Tracers | 10 SDSSJ082547.52+174818.4 g=18.9 mag DC in Nicola’s DR10 catalog K2 Campaign 5
Boston University | IAU 357: WD Tracers | 11 0.0 0.5 1.0 1.5 2.0 Rotational Phase °6 °4 °2 0 2 4 6 Relative Flux (%) ν Nyq 2ν Nyq 3ν Nyq 18.04410 min dark spot 2 hr 30 min 20 min Folded SOAR High-speed photometry from SOAR shows this was a superNyquist signal at 18 min! K2 Campaign 5 SOAR, 5-pt smoothed
Boston University | IAU 357: WD Tracers | 14 Reding et al., in prep. A 315.96 s (5.3 min) signal! 3. On 24 April 2018, the SOAR Goodman slit mask motor burned out, forcing us to do photometry instead of spectroscopy. ν Nyq 3 ν Nyq 7 ν Nyq 11 ν Nyq
space JJ Hermes, Boston University | IAU 357: WD Tracers e.g. Anomalously fast-rotating WDs are often strongly magnetic and likely connect to failed SN Ia The stars have set on K2, which observed >2000 WDs TESS picks up the torch: we are monitoring >3500 WDs with GRP < 16.5 mag