Weighing The Options: The Unseen Companion in LAMOST J2354 is Likely a Massive White Dwarf

M. A. Tucker, A. J. Wheeler, D. M. Rowan +1

LAMOST J235456.73+335625 (J2354) is a binary system hosting a $\sim 0.7{\mathrm{M}}_{\odot }$ K dwarf and a $\sim 1.4{\mathrm{M}}_{\odot }$ dark companion, supposedly a neutron star, in a 0.48d orbi…