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We sample over $500$ relativistic mean-field theories constrained by chiraleffective field theory and properties of isospin-symmetric nuclear matter andtest them against known stellar structure constraints. This includes a recentmass and radius measurement of a compact object in supernova remnant HESSJ1731-347, with an unusually low mass of $M=0.77^{+0.20}_{-0.17}\,M_{\odot}$and a compact radius of $R=10.4^{+0.86}_{-0.78}$ km. We show that none of thesampled nuclear models meet all constraints at the $68\,\%$ credibility level,but that hybrid equations of state with a quark matter inner core and nuclearouter core easily can. This indicates a tension between astrophysicalconstraints and low-energy nuclear theory.

Nuclear and Hybrid Equations of State in Light of the Low-Mass Compact Star in HESS J1731-347