Real-rootedness of Kazhdan--Lusztig and $Z$-polynomials of thagomizer matroids and graphic matroids of $K_{2,n}$

Let $T_n=K_{1,1,n}$, and let $P_n(x)$ denote the Kazhdan–Lusztig polynomial of its graphic matroid. We prove that, whenever $n\ge 2$ and $0\le \lambda \le n\mathrm{/}2$, the polynomial $P_n(x)+\lambda x$ has exactly $\lfloor n\mathrm{/}2\rfloor$ zeros, all of which are negative and simple. In particular, the Kazhdan–Lusztig polynomials of the graphic matroids of $T_n$ and $K_{2,n}$ are real-rooted. We also prove that, for $n\ge 2$, the common polynomial $Z_{T_n}(x)=Z_{K_{2,n}}(x)$ has $n+1$ distinct negative zeros. The proofs use a common rational transformation, reducing the Kazhdan–Lusztig case to alternating sign evaluations at the zeros of a Chebyshev polynomial and the $Z$-polynomial case to a unit-circle criterion for self-inversive polynomials.