Peter R. McCullough STSci Jun 19, 2014 CMU.
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1 Peter R. McCullough STSci Jun 19, 2014 CMU
2 Outline and Summary People Scientific motivations 100,000 eyes 100,000 computers Cultural benefits & challenges Status report 2/28
3 My font is bigger than your font. 3/28
4 P. R. McCullough (STScI, JHU) Ellen Price (Caltech & STScI) Scott W. Fleming (STScI) Andrea Zonca (San Diego Supercomputer Center) Jack Flowers (Reed College) Duy Cuong Nguyen (U. Toronto) Robert Sinkovits (San Diego Supercomputer Center) James Davenport (U. Washington) Pavel Machalek (JHU alum)
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7 None of us is smarter than all of us Dear Peter, Marvelous! It works fine now, many thanks, also for the link to the local users group at STScI. I'm writing a little program. This little issue has held me up for a couple of days and half the night! I clearly should have ed you earlier. Dear [colleague], I found the following [hyperlink] by googling "idl mac cursor I verified that Good luck. Also, thanks for the tip Peter Peter; Apologies for bothering you with this, but your [programming language] skills are so infinitely better than mine you may have an answer at hand. I have been struggling to Do you have any suggestions? -[your colleague]
8 Lots of Work!! Not much time!! Kepler 2.0 TESS JWST 8/28
9 Single-star Planets: Detection methods Transiting planets (Single Star): Constant period, duration and depth Transit signal is extremely nonsinusoidal, transit depth and duration (compared to the orbital period) are very small Box-Least Squares (BLS, Kovacs et al., 2002) algorithm searches for a box-like periodic signal in photometric time series Kepler TESS Slide: Kostov 2012
10 Scientific Applications Single-transit events: Kepler (4-yr dwell) Cold-Jupiters Triple stars K2 (3 month dwell) TESS (1 month to 1 year dwell) PLATO (few month dwell) Aperiodic pulse trains: Circumbinary Planets Inclined & precessing circumbinary planets, i.e. transit pulse trains with gaps Flares on stars 10/28
11 Let s find the best-fitting single dip in each segment of a light curve Kostov et al. 2013
12 A Blip is a Flip of a Dip Kostov et al. 2013
13 A Blip is a Flip of a Dip Kostov et al. 2013
14 B b A Adapted from slide by Josh Carter, ESS 2011
15 B b A PlanetHunters.org and student armies find plausible transit events by eye.
16 Transit Durations of KIC486 Kostov et al. 2013
17 CBP Transits are only approximately periodic. Arrival times are off by many transit durations. Durations vary too. B A P Josh Carter, ESS 2011
18 BLS Pulse Break light curve into segments, run a modified BLS Calculate (Burke et al. 2006): Large delta_chisq à significant improvement of transit model with respect to a constant-flux model.
19 Dip-Blip diagrams Slide: Kostov 2012 Kostov et al. 2013
20 Dip-Blip diagram of Kepler-47 Lots of outliers on the side of the dips, i.e. transits. For the N segments best fitting dip/blip pairs (+ symbols), if we choose k outliers: Are their times of arrival approximately periodic? with a plausible period? (given the eclipsing binary stars period) Are the following approximately consistent? Depths? Durations?
21 Flares Flares will be identified as blips. Fast-Rise Exponential Decays (FREDs) Nearly* 1-1 relationship of FRED with its best-fit box * Challenge: prove/disprove this analytically? 21/28
22 Status report / Summary slide Implement BLS pulse and vectorized version Basic detrending module (from Pyke) Create unit tests of simulated transits Execute on laptops, Amazon cloud, and UCSD supercomputer for small # of stars Transfer all Kepler light curves to UCSD (3 TB) KOIs (3k) & EBs (2k) Analyze runtime vs N light curves Box-car fit à physical parameter fit Inject/recovery for Completeness & Sensitivity Astrophysical Signal / Instrumental False Positive discriminator Short cadence capability Flare detection & parameterization 22/28
23 One more thing Sonification of light curves Can people, in particular blind people, find interesting characteristics of light curves that we miss because we are looking at them? Elena Sabbi and I are going to investigate as a small out-reach component of a much larger astrobiology proposal. Want to join us? 23/28
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