摘要：From the experiences learned in three decades of exoplanet search, wide-field transit surveys have proven to be one of the most effective ways to detect exoplanets.Wide field of view, however, suffers from high false-positive rates caused by blended eclipsing binaries.The chromaticity in eclipse depth is an effective feature to distinguish low-depth eclipsing binaries from transiting exoplanets, making multiple-band photometry follow-up advantageous before a target is passed onto more expensive spectroscopic follow-up.Moreover, a multiple-band photometric survey is itself a powerful method to find and vet planetary candidates and narrow down the candidate list of high-priority targets.In this work, we report the first results of a dual-band (Sloan-g and -i) wide-field photometry survey—the Chinese Small Telescope ARray II (CSTAR-II), an updated version of the original CSTAR.As a key component of the Chinese Exoplanet Searching Program from Antarctica, CSTAR-II has been tested thoroughly at a remote arctic site near Mohe during the winter of 2014.In total, 13,531 light curves with the best overall photometric precision of ~3 mmag were extracted from 7721 stars in the Sloan-g and -i bands.Using a robust method, we have detected 63 variables, of which 48 are newly discovered.The dual-band photometric results as well as the stellar properties of the detected sources are provided in this work.
