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Here we present the Spitzer IRS spectrum of CVSO 224, the sole transitionaldisk located within the ~10 Myr old 25 Orionis group in Orion OB1a. A model fitto the spectral energy distribution of this object indicates a ~7 AU inner diskhole that contains a small amount of optically thin dust. In previous studies,CVSO 224 had been classified as a weak-line T Tauri star based on its Halphaequivalent width, but here we find an accretion rate of 7x10^-11 Msun/yr basedon high-resolution Hectochelle data. CVSO 224's low mass accretion rate is inline with photoevaporative clearing theories. However, the Spitzer IRS spectrumof CVSO 224 has a substantial mid-infrared excess beyond 20microns whichindicates that it is surrounded by a massive outer disk. Millimetermeasurements are necessary to constrain the mass of the outer disk around CVSO224 in order to confirm that photoevaporation is not the mechanism behindcreating its inner disk hole.

A slowly accreting ~10 Myr old transitional disk in Orion OB1a