A Jovian planet in an eccentric 11.5 day orbit around HD 1397 discovered by TESS
- Nielsen, L. D.
- Bouchy, F.
- Turner, O.
- Giles, H.
- Suarez Mascareno, A.
- Lovis, C.
- Marmier, M.
- Pepe, F.
- Segransan, D.
- Udry, S.
- Otegi, J. F.
- Ottoni, G.
- Staport, 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.
- Villasenor, J.
- Wohler, B.
- Stassun, K.
- Howell, S.
- Ciardi, D.
- Gonzales, E.
- Matson, R.
- Beichman, C.
- Schlieder, J.
DOIAbstract
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...
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