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We calculate the excitation spectra of a spin-polarized Hubbard chain awayfrom half-filling, using a high-precision momentum-resolved time-dependentDensity Matrix Renormalization Group method. Focusing on the U<0 case, wepresent in some detail the single-fermion, pair, density and spin spectra, anddiscuss how spin-charge separation is altered for this system. The pair spectrashow a quasi-condensate at a nonzero momentum proportional to the polarization,as expected for this Fulde-Ferrel-Larkin-Ovchinnikov-like superfluid.

Spectral properties of a partially spin-polarized one-dimensional Hubbard/Luttinger superfluid