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We present the first results of K2-OjOS, a collaborative project betweenprofessional and amateur astronomers primarily aimed to detect, characterize,and validate new extrasolar planets. For this work, 10 amateur astronomerslooked for planetary signals by visually inspecting the 20 427 light curves ofK2 campaign 18 (C18). They found 42 planet candidates, of which 18 are newdetections and 24 had been detected in the overlapping C5 by previous works. Weused archival photometric and spectroscopic observations, as well as newhigh-spatial resolution images in order to carry out a complete analysis of thecandidates found, including a homogeneous characterization of the host stars,transit modelling, search for transit timing variations and statisticalvalidation. As a result, we report four new planets (K2-355 b, K2-356 b, K2-357b, and K2-358 b) and 14 planet candidates. Besides, we refine the transitephemeris of the previously published planets and candidates by modelling C5,C16 (when available) and C18 photometric data jointly, largely improving theperiod and mid-transit time precision. Regarding individual systems, wehighlight the new planet K2-356 b and candidate EPIC 211537087.02 being near a2:1 period commensurability, the detection of significant TTVs in the brightstar K2-184 (V = 10.35), the location of K2-103 b inside the habitable zoneaccording to optimistic models, the detection of a new single transit in theknown system K2-274, and the disposition reassignment of K2-120 b, which weconsider as a planet candidate as the origin of the signal cannot beascertained.

The K2-OjOS Project: New and revisited planets and candidates in K2 campaigns 5, 16, & 18