Phosphorus (P) is a critical element for life on Earth, yet the cosmic production sites of P are relatively uncertain. To understand how P has evolved in the solar neighborhood, we measured abundances for 163 FGK stars over a range of -1.09<[Fe/H]<0.47 using observations from the Habitable-zone Planet Finder instrument on the Hobby-Eberly Telescope. Atmospheric parameters were calculated by fitting a combination of astrometry, photometry, and Fe I line equivalent widths. Phosphorus abundances were measured by matching synthetic spectra to a P I feature at 10529.52{AA}. Our [P/Fe] ratios show that chemical evolution models generally underpredict P over the observed metallicity range. Additionally, we find that the [P/Fe] differs by ~0.1dex between thin disk and thick disk stars that were identified with kinematics. The P abundances were compared with {alpha}-elements, iron-peak, odd-Z, and s-process elements, and we found that the evolution of P in the disk most strongly resembles that of the {alpha}-elements. We also find that molar P/C and N/C ratios for our sample match the scatter seen from other abundance studies. Finally, we measure a [P/Fe]=0.09{+/-}0.1 ratio in one low-{alpha} halo star and probable Gaia-Sausage-Enceladus member, an abundance ratio ~0.3-0.5 dex lower than the other Milky Way disk and halo stars at similar metallicities. Overall, we find that P is likely most significantly produced by massive stars in core-collapse supernovae, based on the largest P abundance survey to date.

Cone search capability for table J/AJ/164/61/table1 (*Parallaxes and observation summary)