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Nielsen, L. D.; Bouchy, F.; Turner, O.; Giles, H.; Mascareño, A. Suárez; Lovis, C.; Marmier, M.; Pepe, F.; Ségransan, D.; Udry, S.; Otegi, J. F.; Ottoni, G.; Stalport, M.; Ricker, G.; Vanderspek, R.; Latham, D. W.; Seager, S.; Winn, J. N.; Jenkins, J. M.; Kane, S. R.; Wittenmyer, R. A.; Bowler, B.; Crossfield, I.; Horner, J.; Kielkopf, J.; Morton, T.; Plavchan, P.; Tinney, C. G.; Zhang, Hui; Wright, D. J.; Mengel, M. W.; Clark, J. T.; Okumura, J.; Addison, B.; Caldwell, D. A.; Cartwright, S. M.; Collins, K. A.; Francis, J.; Guerrero, N.; Huang, C. X.; Matthews, E. C.; Pepper, J.; Rose, M.; Villaseñor, J.; Wohler, B.; Stassun, K.; Howell, S.; Ciardi, D.; Gonzales, E.; Matson, R.; Beichman, C.; Schlieder, J.
Astronomy and astrophysics (Berlin), 03/2019, Volume: 623Journal Article
The Transiting Exoplanet Survey Satellite TESS has begun a new age of exoplanet discoveries around bright host stars. We present the discovery of HD 1397b (TOI-120.01), a giant planet in an 11.54-day eccentric orbit around a bright (V = 7.9) G-type subgiant. We estimate both host star and planetary parameters consistently using EXOFASTv2 based on TESS time-series photometry of transits and radial velocity measurements with CORALIE and MINERVA-Australis. We also present high angular resolution imaging with NaCo to rule out any nearby eclipsing binaries. We find that HD 1397b is a Jovian planet, with a mass of 0.415 ± 0.020 MJ and a radius of 1.026 ± 0.026 RJ. Characterising giant planets in short-period eccentric orbits, such as HD 1397b, is important for understanding and testing theories for the formation and migration of giant planets as well as planet-star interactions.
