Abstract
We report on the design and first year of operations of the DEdicated MONitor of EXotransits and Transients (DEMONEXT). DEMONEXT is a 20-inch (0.5-m) robotic telescope using a PlaneWave CDK20 telescope on a Mathis instruments MI-750/1000 fork mount. DEMONEXT is equipped with a 2048 × 2048 pixel Finger Lakes Instruments (FLI) detector; a 10-position filter wheel with an electronic focuser and B, V, R, and I, , , , ; and clear filters. DEMONEXT operates in a continuous observing mode and achieves 2-4 mmag raw, unbinned, precision on bright targets with 20–120 second exposures, and 1 mmag precision achieved by binning on 5–6 minute timescales. DEMONEXT maintains sub-pixel ( pixels) target position stability on the CCD over 8 hours in good observing conditions, with degraded performance in poor weather ( pixel). DEMONEXT achieves 1%–10% photometry on single-epoch targets with in 5 minute exposures, with detection thresholds of . The DEMONEXT automated software has produced 143 planetary candidate transit light curves for the KELT collaboration and 48 supernovae and transient light curves for the ASAS-SN supernovae group in the first year of operation. DEMONEXT has also observed for a number of ancillary science projects including Galactic microlensing, active galactic nuclei, stellar variability, and stellar rotation.
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