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In this work, we explore a systematic investigation on $S$-wave interactionsbetween a doubly charmed baryon $\Xi_{cc}(3621)$ and a charmed meson in a $T$doublet $(D_1,\,D_2^*)$. We first analyze the possibility for forming$\Xi_{cc}D_1/\Xi_{cc}D_2^*$ bound states with the heavy quark spin symmetry.Then, we further perform a dynamical study on the $\Xi_{cc}D_1/\Xi_{cc}D_2^*$interactions within a one-boson-exchange model by considering both the $S$-$D$wave mixing and coupled channel effect. Finally, our numerical results conformthe proposals from the heavy quark spin symmetry analysis: the $\Xi_{cc}D_1$systems with $I(J^P)=$ $0(1/2^+,\,3/2^+)$ and the $\Xi_{cc}D_2^*$ systems with$I(J^P)=$ $0(3/2^+,\,5/2^+)$ can possibly be loose triple-charm molecularpentaquarks. Meanwhile, we also extend our model to the $\Xi_{cc}\bar{D}_1$ and$\Xi_{cc}\bar D_2^*$ systems, and our results indicate the isoscalars of$\Xi_{cc}\bar{D}_1$ and $\Xi_{cc}\bar{D}_2^*$ can be possible molecularcandidates.

Possible triple-charm molecular pentaquarks from $\Xi_{cc}D_1/\Xi_{cc}D_2^*$ interactions