the k2 campaign 9 microlensing experimentnexsci.caltech.edu/.../barentsen_k2c9-pasadena.pdf ·...
TRANSCRIPT
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The K2 Campaign 9Microlensing Experiment
A talk by Geert Barentsen for the 21st Microlensing conference in Pasadena on 3 Feb 2017.
K2 Guest Observer Office
http://keplerscience.arc.nasa.gov
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Kepler was launched on 6 March 2009
0.95-m Schmidt100 Mpixel array (100 deg2) 4 arcsec pixels
1 or 30 min cadence wide passband (V+R+I)
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Due to the loss of two reaction wheels, Kepler is now kept stable by balancing solar radiation on its solar panels=> K2 Mission
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9
K2 Campaign 9 monitored the Bulge
Apr-Jul 2016
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K2 C9 monitored 3.7 deg2 of the Bulge for ~70 days using 30-min cadence
Henderson et al (2016); survey area selected following Poleski (2016).
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Why care about K2 C9?• First large, automated, space-based ulens survey
• Satellite parallaxes for short-lived events; free-floating planets? • Galactic distribution of exoplanets
• A data set that is fully public
• Synergy with Spitzer • ~25+ targets shared with K2C9, ~33 with K2C11
• Excellent practice for WFIRST • Length of observing season (~72 d) • Coordination of ground and space
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Credit: Calen Henderson(http://www.astronomy.ohio-state.edu/~henderson/k2c9_parallax_animations)
Orbital motion
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Simulated event
Credit: Calen Henderson(http://www.astronomy.ohio-state.edu/~henderson/k2c9_parallax_animations)
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Many ground-based facilities monitored the K2 C9 field — thank you!
Henderson et al (2016)
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Coordination via K2 C9 ExoFOP (NExScI)=> See poster by Rachel Akeson!
exofop.ipac.caltech.edu
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K2 C9 Science Team
• To maximize the scientific return, NASA funded a K2 C9 Microlensing Science Team.
• PIs: Bennett, Henderson, Hogg, Penny, Street + Poleski (C11).
• The team was recruited to … • help plan the K2 observations; • facilitate coordinated ground-based observations; • detect and characterize the events observed by K2.
• Value-added products are expected to become public.
✓✓ongoing
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So what does the data look like?
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Challenge: under-sampled crowded field photometry
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K2’s roll motion introduces millimag-level systematics, which can be removed by modeling the noise.
Foreman-Mackey et al. 2015
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After systematics removal, the photometric performance of K2 is in family with Kepler
Vanderburg et al. 2015
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Data products• All K2C9 data are now publicly available at MAST
• http://archive.stsci.edu/k2
• “Target Pixel Files” provide time series for ~1000 pixels at a time
• User-friendly FITS images are being created by Radek Poleski • http://www.astronomy.ohio-state.edu/~poleski/K2C9_SFFI/
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How to get involved?
Join the mailing list: [email protected] (Rachel Street)
Visit ExoFOP:https://exofop.ipac.caltech.edu/k2/microlensing
Talk to Rachel, Radek, Calen, Dun, Matt, Dave++Apply for ADAP funding to work on K2C9!(US-based institutions only)
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K2 C9 offers an opportunity to putmicrolensing even more on the radar
Please keep us informed of interesting results in the pipeline!
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Kepler/K2 Visiting Scientist Program
• We welcome visitors at Kepler/K2 HQ (NASA Ames).
• Opportunity to interface directly with instrument experts.
• Funds available to cover travel and lodging;apply at keplerscience.arc.nasa.gov
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Kepler/K2 is seeking to hire multiple support scientists.
Visit keplerscience.arc.nasa.gov
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