Detalles de publicación
PP 022070
HD 20329b: An ultra-short-period planet around a solar-type star found by TESS
(1) IAC
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 (TOI-4524). 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. The host star (HD 20329, V = 8.74 mag, J = 7.5 mag) is characterized by its G5 spectral type with M = 0.90 +/- 0.05 Msun, R = 1.13 +/- 0.02 Rsun, and Teff = 5596 +/- 50 K; it is located at a distance d = 63.68 +/- 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 +/- (0.5 x 10^-4) days, a planetary radius of Rp = 1.72 +/- 0.07 Rearth, and a mass of Mp = 7.42 +/- 1.09 Mearth, implying a mean density of 8.06 +/- 1.53 g/cm^3. HD 20329b joins the ~30 currently known USP planets with radius and Doppler mass measurements.

