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However, for a system with one known transiting planet (with mass <jats:italic>m<\/jats:italic><jats:sub>1<\/jats:sub>), we can detect a co-orbital companion (with mass <jats:italic>m<\/jats:italic><jats:sub>2<\/jats:sub>) by combining the time of mid-transit with the radial-velocity data of the star. Here, we propose a simple method that allows the detection of co-orbital companions, valid for eccentric orbits, that relies on a single parameter <jats:italic>\u03b1<\/jats:italic>, which is proportional to the mass ratio <jats:italic>m<\/jats:italic><jats:sub>2<\/jats:sub>\/<jats:italic>m<\/jats:italic><jats:sub>1<\/jats:sub>. Therefore, when <jats:italic>\u03b1<\/jats:italic> is statistically different from zero, we have a strong candidate to harbour a co-orbital companion. We also discuss the relevance of false positives generated by different planetary configurations. <\/jats:p>","DOI":"10.1051\/0004-6361\/201630073","type":"journal-article","created":{"date-parts":[[2017,2,20]],"date-time":"2017-02-20T07:32:53Z","timestamp":1487575973000},"page":"L7","source":"Crossref","is-referenced-by-count":30,"title":["Detection of co-orbital planets by combining   transit and radial-velocity measurements"],"prefix":"10.1051","volume":"599","author":[{"given":"A.","family":"Leleu","sequence":"first","affiliation":[]},{"given":"P.","family":"Robutel","sequence":"additional","affiliation":[]},{"given":"A. C. 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