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We report the latest Planet Hunter results, including PH2 b, a Jupiter-size(R_PL = 10.12 \pm 0.56 R_E) planet orbiting in the habitable zone of asolar-type star. PH2 b was elevated from candidate status when a series offalse positive tests yielded a 99.9% confidence level that transit eventsdetected around the star KIC 12735740 had a planetary origin. Planet Huntervolunteers have also discovered 42 new planet candidates in the Kepler publicarchive data, of which 33 have at least three transits recorded. Most of thesetransit candidates have orbital periods longer than 100 days and 20 arepotentially located in the habitable zones of their host stars. Nine candidateswere detected with only two transit events and the prospective periods arelonger than 400 days. The photometric models suggest that these objects haveradii that range between Neptune to Jupiter. These detections nearly double thenumber of gas giant planet candidates orbiting at habitable zone distances. Weconducted spectroscopic observations for nine of the brighter targets toimprove the stellar parameters and we obtained adaptive optics imaging for fourof the stars to search for blended background or foreground stars that couldconfuse our photometric modeling. We present an iterative analysis method toderive the stellar and planet properties and uncertainties by combining theavailable spectroscopic parameters, stellar evolution models, and transitinglight curve parameters, weighted by the measurement errors. Planet Hunters is acitizen science project that crowd-sources the assessment of NASA Kepler lightcurves. The discovery of these 43 planet candidates demonstrates the success ofcitizen scientists at identifying planet candidates, even in longer periodorbits with only two or three transit events.

Planet Hunters. V. A Confirmed Jupiter-Size Planet in the Habitable Zone and 42 Planet Candidates from the Kepler Archive Data