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Campaign 9 of K2: News from the K2 team

Campaign 9 of K2: News from the K2 team

A talk by Geert Barentsen & Tom Barclay
 for the 20th Microlensing workshop in Paris
 on 14 January 2016.

Geert Barentsen

January 14, 2016
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  1. Campaign 9 of K2:
 News from the K2 team A

    talk by Geert Barentsen & Tom Barclay
 for the 20th Microlensing workshop in Paris
 on 14 January 2016.
 
 K2 Guest Observer Office (NASA Ames) http://keplerscience.arc.nasa.gov
  2. Geert Barentsen (@GeertHub) Kepler was launched on 6 March 2009

    0.95-m Schmidt 100 Mpixel array (100 deg2)
 1 or 30 min cadence wide passband (~V+R+I)
  3. As of 2013, the solar radiation pressure needs to be

    balanced on the solar panels to minimize torques around the roll axis
  4. Mar-May
 2014 May-Aug
 2014 Aug-Nov
 2014 Nov-Feb
 2015 Feb-Apr
 2015

    Apr-Jul
 2015 Kepler now changes its pointing every 80 days 0 1 2 3 4 5 9 => “K2 mission”
  5. Geert Barentsen (@GeertHub) What is K2? • K2 is a

    two-reaction wheel mission
 utilizing the Kepler spacecraft • Targets 100 deg2 fields
 during 80-day campaigns • Limited by on-board storage:
 3-5 Mpix per cadence • Community mission: all targets selected through peer review • Open data
  6. The roll motion of the spacecraft is visible in K2

    data taken towards focal plane edges Note: thrusters correct
 the attitude every ~6h
 (cf. “jumps”)
  7. Earth Kepler Spitzer View from above on 15 May 2016

    Sun “Backward facing”
 (—Velocity Vector)
  8. Earth Kepler Spitzer View from above on 15 May 2016

    Sun “Forward facing”
 (+ Velocity Vector)
  9. Geert Barentsen (@GeertHub) C9 operations have been in preparation for

    8 months • Engineers have worked on 53 issues related to C9, including: • turning the spacecraft in the opposite direction; • adding a mid-campaign downlink to obtain more pixels; • overcoming data compression issues; • enabling fast access to the raw data; • enabling ongoing events to be added to the target list. • Please credit the efforts from the engineers at NASA Ames & Ball Aerospace where you can.
  10. Geert Barentsen (@GeertHub) Schedule Exact times will be known ~2

    months in advance
 when the Deep Space Network schedule settles (K2C9 white paper, Henderson et al 2016)
  11. Geert Barentsen (@GeertHub) K2C9 Science Team • To maximize the

    scientific return, NASA has funded 
 a C9 Microlensing Science Team. • The team has been recruited to … • make recommendations on the observation planning; • facilitate coordinated ground-based observations; • detect, characterize, and understand the events observed by K2,
 e.g. address under-sampled crowded field photometry. • All data, products, results obtained by the team are expected to be made public.
  12. Geert Barentsen (@GeertHub) K2C9 Science Team (II) • Team was

    selected in Oct 2015 through a peer-review process. • Selected PIs are David Bennett (Goddard), Calen Henderson (JPL/Caltech), David Hogg (NYU), Matthew Penny (Ohio), and Rachel Street (LCOGT).
 
 
 
 
 
 • Joined by Radek Poleski, co-investigators, K2 personnel. Bennett Henderson Hogg Penny Street
  13. Geert Barentsen (@GeertHub) K2C9 Science Team (III) • Achievements of

    the team so far include: • the white paper (arXiv:1512.09142); • presentations at the AAS (6 Jan) and today’s workshop (14 Jan); • setting up an open mailing list and wiki; • guiding NExSci to adapt the ExoFOP system for C9; • advocacy for UKIRT time (successful — NASA funds 180h); • advocacy for later K2 deadlines to add ongoing events (successful); • a strategy to obtain lightcurves from the K2 pixel data. • … • See other talks today!
  14. Preliminary pixel selection (Poleski) Module 10 Module 15 Final selection

    will also include thousands of small masks spread across the field to cover DDT targets & ongoing events
  15. Channel 31 Channel 32 Channel 52 Channel 49 Channel 30

    Preliminary pixel selection (Poleski)
  16. Geert Barentsen (@GeertHub) Pixel selection deadlines • Pixels need to

    be selected by 25 Jan 2016 • Operators need to prepare, validate, and uplink spacecraft command sequences in a timely fashion. • Science Team advocated for a later deadline to be able to include ongoing events; engineers have committed to append a small number of targets (~100 i.e. <0.5%) at a later deadline.
 • Targets for C9a (7/Apr-18/May) can be added up to 1/Mar. • Targets for C9b (22/May - 1/Jul) can be added up to 25/Apr.
  17. Geert Barentsen (@GeertHub) Mid-campaign offset • K2 photometry is challenged

    by intra- and inter-pixel sensitivity variations which come into play due to the spacecraft roll. • Dithering would offer a better handle on these variations than the rolling motion alone. • Dithering before or during C9 was deemed too risky;
 a mid-campaign offset will be performed instead.
  18. Geert Barentsen (@GeertHub) We are happy to help! • Kepler

    GO office: Tom Barclay, Knicole Colon, Geert Barentsen • E-mail us at [email protected] • Tweet us at @KeplerGO • Visit our new website: http://keplerscience.arc.nasa.gov
  19. Geert Barentsen (@GeertHub) “K2fov”: a Python package for querying and

    plotting K2 Campaign fields https://github.com/KeplerGO/K2fov
  20. Geert Barentsen (@GeertHub) We will be releasing the K2 C9

    data
 as soon as possible • Release plan: • 2016 May 24: C9a raw images • 2016 July 6: C9b raw images • 2016 Sep 26: C9a + C9b reduced images
 (+ lightcurves for isolated targets)
 • Data will be public. No old-fashioned proprietary period! • We encourage other facilities to embrace the openness.
  21. Geert Barentsen (@GeertHub) Accessing raw K2 data • The “kadenza”

    Python package makes raw data accessible:
 https://github.com/KeplerGO/kadenza • A 10-day sample of raw C0 data has been posted at
 https://archive.stsci.edu/missions/k2/c0_raw_cadence_data/
  22. We have unearthed the raw PRF characterization data (April 2009)

    • Dithering data obtained during commissioning. • Talk to me if you’re interested in obtained these files!
  23. Geert Barentsen (@GeertHub) Press and outreach support • We have

    skilled PR and outreach staff embedded within the Kepler/K2 office • They are experts at crafting press releases and preparing visuals • They can coordinate with your institutions • Please keep us updated on likely news stories!
  24. Geert Barentsen (@GeertHub) Visiting the Kepler/K2 team • We can

    host visitors at NASA Ames (California). • Opportunity to interface directly with instrument expertise. • Would particularly benefit those tackling K2 data reduction.
 (Hack week?) • E-mail us at [email protected] if you are interested. • (Non US-citizens must apply >1 month in advance.)
  25. Geert Barentsen (@GeertHub) Future target & funding opportunities 11 12

    13 • A call is open for proposals related to Campaigns 11, 12, 13 • Step 1 deadline: Feb 5, 2016 • Step 2 deadline: Mar 4, 2016 • Funding via formula ($30,000 to $150,000)
  26. Geert Barentsen (@GeertHub) A second microlensing experiment in C11? •

    K2 will survey the Northern Bulge during Campaign 11:
 24 Sep 2016 - 8 Dec 2016. • Subject to K2 passing the senior review. • Likely K2’s final visit to the Galactic Center & Bulge. • We encourage proposals from the microlensing community. • Microlensing proposals will compete with other science; need to request a pixel budget that is justifiable. (Think 10%-30%?) • Step 1 deadline is 5 Feb 2016.
  27. Geert Barentsen (@GeertHub) • ESO public survey using the 2.5-meter

    VLT Survey Telescope (VST) in Paranal. • u, g, r, i, Halpha imaging to 21st magnitude (complements VVV in optical). • Median seeing 0.8-0.9 arcsec. • Public band-matched catalogue available (daophot psf photom) VPHAS+ Survey
  28. Geert Barentsen (@GeertHub) Summary & closing remarks • K2 Campaign

    9 offers an exciting opportunity for microlensing. • The experiment represent a significant investment of public resources from NASA and Kepler/K2 into microlensing science. • We encourage the entire community to get together to make C9 a success — this is an opportunity to strengthen the field and secure future resources.