2025ApJ...987...89Y

Using high-precision photometric data from the Transiting Exoplanet Survey Satellite, medium-resolution spectroscopic data from the Large Sky Area Multi-Object Fiber Spectroscopy Telescope, and long-term eclipse timings, we provide orbital parameters for two early-type detached eclipsing binary systems: TYC 3740-2072-1 and TYC 2888-780-1, and analyze the orbital period variations and evolutionary status of these two targets. TYC 3740-2072-1, with a spectral type of B1V, consists of a 6.914 M_⊙ subgiant and a 6.233 M_⊙ main-sequence component. It is expected to evolve into a semidetached binary, potentially serving as a progenitor of a Type Ia supernova. TYC 2888-780-1 has a spectral type of A3 and consists of two main-sequence components with masses of 1.682 and 1.673 M_⊙, respectively. It is undergoing stable evolution. Through eclipse timing analysis, we find that both targets exhibit apsidal motion effects, with observed apsidal motion rates of ${\dot{\omega }}_{\mathrm{obs}}=0.0412\,\,\rm{deg}\,\,{\,\rm{cycle}\,}^{-1}$ and ${\dot{\omega }}_{\mathrm{obs}}=0.0205\,\,\rm{deg}\,\,{\,\rm{cycle}\,}^{-1}$, respectively. Additionally, TYC 2888-780-1 exhibits orbital period variations, which we attribute to the light travel time effect caused by a third body; the minimum mass of this third body is estimated to be 0.598 M_⊙.