Determining the Mass and Characteristic Disk Radii of Per-Emb-14 Using Rotation and Infall

Abstract Class 0/I protostars are in the earliest phases of formation and are deeply embedded in their environments. The dense natal surroundings impede kinematic measurements of parameters such as protostellar masses and disk radii. We present a study of gas dynamical mass measurements of Class 0 protostar Per-Emb-14 in the Perseus Molecular Cloud. We use FERIA—a combined Keplerian disk and infalling-rotating envelope model—to create position–position–velocity cubes using a grid search method for comparison with ALMA C 18 O observations. We find a protostellar mass of 0.41 ± 0.17 M ⊙ , similar to simpler Keplerian disk fitting. We also report a maximum system outer radius R out = 758 ± 177 au. However, the spatial resolution of the observations limits accuracy. We also find a centrifugal barrier radius of 430 ± 174 au, indicating Keplerian motions dominate over infall out to a relatively large radius.