Targeted-mode pipeline for the Evryscope: a minute cadence, 10,000-square-degree FoV, gigapixel-scale telescope
The Everyscope consists of 27 mass-produced telescopes placed into a dome which mimics the sky's hemisphere. It has a field of view of 10,200 square degrees, a pixel sampling of 13.3 arcsec, 778MPix per exposure, a two-minute imaging cadence, and a limiting magnitude V=16.4 (3-σ) for that exposure time. Among other observational programs, transits surveys around nearby bright, M-dwarfs, and bright white dwarfs hosts stars will be conducted with unprecedented level of efficiency thanks to the unique Evryscope specifications. All data will be stored to be to made available to interested astronomers.Evryscope brings a unique opportunity to tackle challenges in the areas of computation and data analysis, given its sustained 0.76Gb/min data-flow. We have implemented an initial targeted-mode version of the Evryscope pipeline (Evrypipe-I), which delivers to end user science products from a limited list of targets of interest. The pipeline first performs CCD calibration, astrometric reduction, and source extraction, and generates uncalibrated photometry catalogs for all acquired images. Next, image cutouts around the compiled targets are considered. These much smaller images allow us to feasibly compute multi-epoch light curves on the reduced data-sets, including proper systematics analysis which the millimagnitude precision goals require. This last step includes source association, differential photometry, polynomial differential airmass correction, detrending, and phase folding.From end user point of view, Evrypipe-I delivers fully calibrated WCS FITS image cutouts and multi-epoch light curves around the compiled/requested targets. The development of a more complex all-sky every-star analysis pipeline, covering the 10s of millions of targets measured in each Evryscope exposure, is planned to start in the near future.
American Astronomical Society Meeting Abstracts #225
- Pub Date:
- January 2015