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Astron. Astrophys. 350, 875-882 (1999)

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A very cold disc of dust around the G0V star HD 207129 *

M. Jourdain de Muizon 1,2, R.J. Laureijs 3, C. Dominik 4, H.J. Habing 4, L. Metcalfe 3, R. Siebenmorgen 3, M.F. Kessler 3, P. Bouchet 5, A. Salama 3, K. Leech 3, N. Trams 3 and A. Heske 3

1 DESPA, Observatoire de Paris, 92190 Meudon, France
2 LAEFF-INTA, ESA Vilspa, PO Box 50727, 28080 Madrid, Spain (muizon@laeff.esa.es)
3 ISO Data Center, Astrophysics Division, Space Science Department of ESA, Villafranca del Castillo, P.O. Box 50727, 28080 Madrid, Spain
4 Leiden Observatory, P.O. Box 9513, 2300 RA Leiden, The Netherlands
5 Cerro Tololo Inter-American Observatory, NOAO, Casilla 603, La Serena, Chile 1353

Received 12 February 1999 / Accepted 21 June 1999

Abstract

We present ISO observations made between 2.5 and 180µm 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 180µm. 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 25µm 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.

Key words: stars: general – stars: individual: HD 207129 – stars: planetary systems – infrared: stars

* 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.

Send offprint requests to: M. Jourdain de Muizon

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© European Southern Observatory (ESO) 1999

Online publication: October 14, 1999
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