A very cold disc of dust around the G0V star HD 207129
Kessler, M. F.; Siebenmorgen, R.; Bouchet, P.; Metcalfe, L.; Dominik, C.; Laureijs, R. J.; Salama, A.; Trams, N.; Habing, H. J.; Leech, K.; Jourdain de Muizon, M.; Heske, A.
France, Spain, Netherlands, Chile
Abstract
We present ISO observations made between 2.5 and 180 mu m of the nearby G0V dwarf HD 207129 taken as part of a large survey of nearby main-sequence stars in search of debris discs. HD 207129 emits radiation in excess of the photospheric flux density between at least 60 and 180 mu m. The infrared excess is explained by a disc of cold dust particles (25 to 50 K) and, to account for the absence of a significant 25 mu m excess, the disc must have a central hole of several 100 AU radius. We discuss various models and show how the disc will evolve in time under the influence of radiation pressure and Poynting-Robertson drift. The presence of the large hole suggests that HD 207129 has at least one planet. Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, The Netherlands and the United Kingdom) with the participation of ISAS and NASA.