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The question whether stellar bars are either transitory features orlong-lived structures is still matter of debate. This problem is more acute fordouble-barred systems where even the formation of the inner bar remains achallenge for numerical studies. We present a thorough study of the centralstructures of the double-barred galaxy NGC1291. We used a two-dimensionalmulti-component photometric decomposition performed on the 3.6$\mu$m imagesfrom S$^4$G, combined with both stellar kinematics and stellar populationanalysis carried out using integral field data from the MUSE TIMER project. Wereport on the discovery of the first Box-Peanut (B/P) structure in an inner bardetected in the face-on galaxy NGC1291. The B/P structure is detected asbi-symmetric minima of the $h_4$ moment of the line-of-sight velocitydistribution along the major axis of the inner bar, as expected from numericalsimulations. Our observations demonstrate that inner bars (similarly as outerbars) can suffer buckling instabilities, thus suggesting they can survive along time after bar formation. The analysis of the star formation history forthe structural components shaping the central regions of NGC 1291 alsoconstrains the epoch of dynamical assembly of the inner bar, which took place$>$6.5 Gyr ago for NGC1291. Our results imply that the inner bar of NGC1291 isa long-lived structure.

The long-lived inner bar of NGC1291