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D\\'iaz, N\\'estor Espinoza, Pascal Torres, Paula Sarkis, Rafael Brahm, Thomas Henning","submitted_at":"2018-11-06T04:34:09Z","abstract_excerpt":"We report the discovery of a transiting planet first identified as a candidate in Sector 1 of the Transiting Exoplanet Survey Satellite (TESS), and then confirmed with precision radial velocities. HD1397b has a mass of ${\\rm M_P}$ = $0.335_{-0.018}^{+0.018}$ ${\\rm M_J}$, a radius of ${\\rm R_P}$ = $1.021_{-0.014}^{+0.015}$ ${\\rm M_J}$, and orbits its bright host star ($V = 7.8$ mag) with an orbital period of $11.53508 \\pm 0.00057 $ d, on a moderately eccentric orbit ($e$ = 0.210 $\\pm$ 0.038). 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