The Orbital Parameters of the Spectroscopic Binary WISPIT 2

We report the updated orbital solution for the spectroscopic binary WISPIT 2 based on 17 spectra collected with VLT/X-Shooter and the MPG/ESO 2.2 m FEROS spectrograph. The addition of ten new FEROS epochs extends the observational baseline to 144 days. Our new orbital parameters yield a period of P = 4.8026 ± 0.0001 days, a radial velocity (RV) semiamplitude of K 1 = 26.665 ± 0.014 km s −1 , a systemic velocity of V 0 = 5.81 ± 0.01 km s −1 , and a non-zero eccentricity of e = 0.0079 ± 0.0004 with argument of periastron ω = 9 . ° 81 ± 1 . ° 65 . Adopting a total disk dynamical mass range between 1.30 and 1.39 M ⊙ at an inclination of i = 45 . ° 66 , these results resolve the individual components to M 1 = 0.95–1.02 M ⊙ and M 2 = 0.35–0.37 M ⊙ ( q = 0.36–0.37), providing better estimates for the evolutionary stage of the system, ongoing accretion line studies, and circumbinary disk modeling.