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We present X-ray observations of the transient accretion-powered millisecondpulsar IGR J00291+5934 during quiescence. IGR J00291+5934 is the first sourceamong accretion powered millisecond pulsars to show signs of a thermalcomponent in its quiescent spectrum. Fitting this component with a neutron staratmosphere or a black body model we obtain soft temperatures (~64 eV and ~110eV, respectively). As in other sources of this class a hard spectral componentis also present, comprising more than 60% of the unabsorbed 0.5-10 keV flux.Interpreting the soft component as cooling emission from the neutron star, wecan conclude that the compact object can be spun up to milliscond periods byaccreting only <0.2 solar masses.

XMM-Newton observations of IGR J00291+5934: signs of a thermal spectral component during quiescence