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The low mass X-ray binary (LMXB) IGR J17480-2446 is an 11 Hz accreting pulsarlocated in the core of the globular cluster Terzan 5. This is a mildly recycledaccreting pulsar with a peculiar evolutionary history since its total age hasbeen suggested to be less than a few hundred Myr, despite the very old age ofTerzan 5 (~12 Gyr). Solving the origin of this age discrepancy might be veryvaluable because it can reveal why systems like IGR J17480-2446 are so rare inour Galaxy. We have performed numerical simulations (dynamical and binaryevolution) to constrain the evolutionary history of IGR J17480-2446 . We findthat the binary has a high probability to be the result of close encounters,with a formation mechanism compatible with the tidal capture of the donor star.The result reinforces the hypothesis that IGR J17480-2446 is a binary thatstarted mass transfer in an exceptionally recent time. We also show thatprimordial interacting binaries in the core of Terzan 5 are strongly affectedby a few hundred close encounters (fly-by) during their lifetime. This effectmight delay, accelerate or even interrupt the Roche lobe overflow (RLOF) phase.Our calculations show that systems of this kind can form exclusively in denseenvironments like globular clusters.

A Tidal Capture Formation Scenario for the Accreting Pulsar IGR J17480-2446 in Terzan 5