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We report the discovery of the transiting hot Jupiter XO-7 b and of a second, massive companion on a wide orbit around a circumpolar, bright, and metal-rich G0 dwarf (<jats:italic>V<\/jats:italic>\u00a0=\u00a010.52, <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"ajab5b12ieqn1.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula>, <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"ajab5b12ieqn2.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula>). We conducted photometric and radial velocity follow-up with a team of amateur and professional astronomers. XO-7 b has a period of <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"ajab5b12ieqn3.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula> days, a mass of <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"ajab5b12ieqn4.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula>, a radius of <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"ajab5b12ieqn5.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula>, a density of <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"ajab5b12ieqn6.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula>, and an equilibrium temperature of <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"ajab5b12ieqn7.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula>. Its large atmospheric scale height and the brightness of the host star make it well suited to atmospheric characterization. The wide-orbit companion is detected as a linear trend in radial velocities with an amplitude of <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"ajab5b12ieqn8.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula> over two years, yielding a minimum mass of 4 <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"ajab5b12ieqn9.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula>; it could be a planet, a brown dwarf, or a low-mass star. The hot Jupiter orbital parameters and the presence of the wide-orbit companion point toward a high-eccentricity migration for the hot Jupiter. Overall, this system will be valuable to understand the atmospheric properties and migration mechanisms of hot Jupiters and will help constrain the formation and evolution models of gas giant exoplanets.<\/jats:p>","DOI":"10.3847\/1538-3881\/ab5b12","type":"journal-article","created":{"date-parts":[[2020,1,10]],"date-time":"2020-01-10T15:27:14Z","timestamp":1578670034000},"page":"44","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":9,"title":["XO-7 b: A Transiting Hot Jupiter with a Massive Companion on a Wide Orbit"],"prefix":"10.3847","volume":"159","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7866-8738","authenticated-orcid":false,"given":"Nicolas","family":"Crouzet","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7718-7884","authenticated-orcid":false,"given":"Brian F.","family":"Healy","sequence":"additional","affiliation":[]},{"given":"Guillaume","family":"H\u00e9brard","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9165-9799","authenticated-orcid":false,"given":"P. 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