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The recently-discovered accreting X-ray pulsar IGR J17480--2446 spins at afrequency of ~11 Hz. We show that Type I X-ray bursts from this source displayoscillations at the same frequency as the stellar spin. IGR J17480--2446 is thefirst secure case of a slowly rotating neutron star which shows Type I burstoscillations, all other sources featuring such oscillations spin at hundreds ofHertz. This means that we can test burst oscillation models in a completelydifferent regime. We explore the origin of Type I burst oscillations in IGRJ17480--2446 and conclude that they are not caused by global modes in theneutron star ocean. We also show that the Coriolis force is not able to confinean oscillation-producing hot-spot on the stellar surface. The most likelyscenario is that the burst oscillations are produced by a hot-spot confined byhydromagnetic stresses.

Implications of burst oscillations from the slowly rotating accreting pulsar IGR 17480-2446 in the globular cluster Terzan 5