An ultra-short-period exoplanet discovered with TESS arxiv
We used TESS light curves and HARPS-N spectrograph radial velocity measurements to establish the physical properties of the transiting exoplanet candidate found around the star HD 20329 . We performed a joint fit of the light curves and radial velocity time series to measure the mass, radius, and orbital parameters of the candidate. We confirm and characterize HD 20329b, an ultra-short-period planet transiting a solar-type star.
05$ M$_\odot$, $\mathrm{R}_\star=1.13 \pm 0.02$ R$_\odot$, and $\mathrm{T}_{\mathrm{eff}}= 5596 \pm 50$ K; it is located at a distance $d=63.68 \pm 0.29$ pc. By jointly fitting the available TESS transit light curves and follow-up radial velocity measurements, we find an orbital period of $0.9261 \pm $ days, a planetary radius of $1.72 \pm 0.07$ $\mathrm{R}_\oplus$, and a mass of $7.42 \pm 1.09$ $\mathrm{M}_\oplus$, implying a mean density of $\rho_\mathrm{p}=8.06 \pm 1.53$ g cm$^{-3}$.
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