HD 172555: detection of 63 μm [OI] emission in a debris disc P. Riviere-Marichalar, D. Barrado, J.-C. Augereau, W. F. Thi, A. Roberge, C. Eiroa, B. Montesinos, G. Meeus, C. Howard, G. Sandell et al. (7 more) A&A, 546 (2012) L8 Published online: 16 October 2012 DOI: 10.1051/0004-6361/201219745