http://arxiv.org/abs/1709.05353
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 $2048\times2048$ pixel Finger Lakes Instruments (FLI) detector, a 10-position filter wheel with an electronic focuser and $B$, $V$, $R$, $I$, $g’$, $r’$, $i’$, $z’$, and clear filters. DEMONEXT operates in a continuous observing mode and achieves 2-4 mmag raw, unbinned, precision on bright $V<13$ targets with 20-120 second exposures, and 1 mmag precision achieved by binning on 5-6 minute timescales. DEMONEXT maintains sub-pixel ($<0.5$ pixels) target position stability on the CCD over 8 hours in good observing conditions, with degraded performance in poor weather ($<1$ pixel). DEMONEXT achieves 1-10% photometry on single-epoch targets with $V<17$ in 5 minute exposures, with detection thresholds of $V\approx21$. 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.
S. Villanueva, B. Gaudi, R. Pogge, et. al.
Tue, 19 Sep 17
49/57
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