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We study $D$ and $D_s$ mesons at finite temperature using an effective fieldtheory based on chiral and heavy-quark spin-flavor symmetries within theimaginary-time formalism. Interactions with the light degrees of freedom areunitarized via a Bethe-Salpeter approach, and the $D$ and $D_s$ self-energiesare calculated self-consistently. We generate dynamically the $D^*_0(2300)$ and$D_s(2317)$ states, and study their possible identification as the chiralpartners of the $D$ and $D_s$ ground states, respectively. We show theevolution of their masses and decay widths as functions of temperature, andprovide an analysis of the chiral-symmetry restoration in the heavy-flavorsector below the transition temperature. In particular, we analyse the veryspecial case of the $D$-meson, for which the chiral partner is associated tothe double-pole structure of the $D^*_0(2300)$.

Impact of a thermal medium on $D$ mesons and their chiral partners