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The Transiting Exoplanet Survey Satellite TESS has begun a new age ofexoplanet discoveries around bright host stars. We present the discovery of HD1397b (TOI-120.01), a giant planet in an 11.54day eccentric orbit around abright (V=7.9) G-type subgiant. We estimate both host star and planetaryparameters consistently using EXOFASTv2 based on TESS time-series photometry oftransits and CORALIE radial velocity measurements. We find that HD 1397b is aJovian planet, with a mass of $0.419\pm-0.024$ M$_{\rm Jup}$ and a radius of$1.023^{+0.023}_{-0.026$}$ R$_{\rm Jup}$. Characterising giant planets inshort-period eccentric orbits, such as HD 1397b, is important for understandingand testing theories for the formation and migration of giant planets as wellas planet-star interactions.

A Jovian planet in an eccentric 11.5 day orbit around HD1397 discovered by TESS