Recent Operational Improvements To High Precision Photometric Observations With Warm IRAC

Details Recent Operational Improvements To High Precision Photometric Observations With Warm IRAC Recent Operational Improvements To High Precision Photometric Observations With Warm IRAC

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924512c&link_type=abstract

American Astronomical Society, AAS Meeting #219, #245.12

Astronomy and Astrophysics

Astronomy

Scientific paper

We present recent improvements to the data taking for high precision photometric observations with warm IRAC. The IRAC 3.6 and 4.5 μm observations have significant photometric systematics due to a coupling of telescope motions with intra-pixel gain variations. These systematics are being trended with increasingly sophisticated techniques by the community (e.g. Ballard et al. 2010). A significant systematic due to a pointing wobble was reduced by 50% permitting observers to achieve precisions of 60 ppm (Demory et al. 2011). Most recently, use of the optical peakup instrument aboard Spitzer has been tested to place all IRAC staring mode observations on the same portion of a pixel. These tests have been effective in placing repeated epochs in the same 0.24 by 0.24 arcsec region of a pixel which has a minimal gain variation (sweet-spot). Preliminary high precision ( 10-4) gain maps of the sweet-spots will be presented. Coupled with science data taken at these sweet-spots, the gain maps will improve the ability to remove systematics from photometry. Results from demonstration observations of KOI-069 will be presented. The peakup mode has been tested for targets with V magnitude between 7 and 12.5. In limited testing, peakups using guide stars have been shown effective for stars outside this magnitude range. Full commissioning of the mode is ongoing with the expectation that all high-precision photometric observations will use peakups by the beginning of 2012. Use of the mode can continue as long as Spitzer is operating and should permit photon-limited follow-up and characteriztion of all Kepler discoveries. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech.

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