Article révisé par les pairs
Résumé : We describe distinctive stellar features indicating the presence of hyperons in neutron stars as compared to purely nucleonic systems. A strongly negative curvature of the mass-radius relation R ( M ) is characteristic of hyperons, which can be determined from measurements of neutron stars with three different masses. Similarly, a reduced second derivative of the tidal deformability as a function of mass λ ( M ) points to hyperonic degrees of freedom in neutron star matter. The slopes of such curves R ( M ) and λ ( M ) can distinguish a hyperonic equation of state from purely nucleonic models if they appear increased [decreased for λ ( M ) ] relative to the maximum mass of neutron stars.

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