The Radial and Rotational Velocities of PSO J318.5338$-$22.8603, a Newly Confirmed Planetary-Mass Member of the $\beta$ Pictoris Moving Group

K. N. Allers, J. F. Gallimore, Michael C. Liu +1

PSO J318.5338$-$22.8603 is an extremely-red planetary-mass object that has been identified as a candidate member of the $\beta$ Pictoris moving group based on its spatial position and…