Program: GS-2022A-Q-247

Eclipsing binary systems (EBs) are crucial tools for deriving precise stellar masses and radii, which can then be used to test stellar evolution models. The identification and follow-up of very young (<10 Myr) eclipsing systems is particularly crucial, as stellar radii contract rapidly on the pre-main sequence, and theoretical isochrones are not well constrained here. Through analysis of K2 Mission photometric data, we have discovered five new EBs in the ~1-2 Myr Lagoon Nebula Cluster (NGC 6530). We are requesting multi-epoch spectroscopy with Gemini South and IGRINS, to obtain radial velocity measurements of these systems as well as constrain components' effective temperatures. By simultaneously modeling the IGRINS radial velocity time series along with the K2 light curves, we aim to derive masses and radii at the few percent precision level for all five sets of stars. Our determined parameters will enlarge the pre-main sequence EB sample by ~50%, enabling stringent testing of stellar models in a regime where there are few existing constraints.