A Jovian planet in an eccentric 11.5 day orbit around HD 1397 discovered by TESS
- L. D. Nielsen
- F. Bouchy
- O. Turner
- H. Giles
- A. Suárez Mascareño
- C. Lovis
- M. Marmier
- F. Pepe
- D. Ségransan
- S. Udry
- J. F. Otegi
- G. Ottoni
- M. Stalport
- G. Ricker
- R. Vanderspek
- D. W. Latham
- S. Seager
- J. N. Winn
- J. M. Jenkins
- S. R. Kane
- R. A. Wittenmyer
- B. Bowler
- I. Crossfield
- J. Horner
- J. Kielkopf
- T. Morton
- P. Plavchan
- C. G. Tinney
- Hui Zhang
- D. J. Wright
- M. W. Mengel
- J. T. Clark
- J. Okumura
- B. Addison
- D. A. Caldwell
- S. M. Cartwright
- K. A. Collins
- J. Francis
- N. Guerrero
- C. X. Huang
- E. C. Matthews
- J. Pepper
- M. Rose
- J. Villaseñor
- B. Wohler
- K. Stassun
- S. Howell
- D. Ciardi
- E. Gonzales
- R. Matson
- C. Beichman
- J. Schlieder
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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