EDP Sciences
Free Access
Volume 387, Number 1, May III 2002
Page(s) 285 - 293
Section Formation and evolution of planetary systems
DOI https://doi.org/10.1051/0004-6361:20020366

A&A 387, 285-293 (2002)
DOI: 10.1051/0004-6361:20020366

A 25 micron search for Vega-like disks around main-sequence stars with ISO

R. J. Laureijs1, M. Jourdain de Muizon2, 3, K. Leech1, R. Siebenmorgen4, C. Dominik5, H. J. Habing6, N. Trams7 and M. F. Kessler1

1  ISO Data Centre, ESA Astrophysics Division, Villafranca del Castillo, PO Box 50727, 28080 Madrid, Spain
2  LAEFF-INTA, ESA VILSPA, PO Box 50727, 28080 Madrid, Spain
3  DESPA, Observatoire de Paris, 92190 Meudon, France
4  ESO, K. Schwarzschildstr. 2, 85748 Garching bei München, Germany
5  Astr. Inst. Anton Pannekoek, Univ. Amsterdam, Kruislaan 403, 1098 SJ, Amsterdam, The Netherlands
6  Leiden Observatory, PO Box 9513, 2300 RA Leiden, The Netherlands
7  Integral Science Operations, ESA ESTEC, Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands

(Received 10 August 2001 / Accepted 8 March 2002 )

We present an ISO 25 $\mu$m photometric survey of a sample of 81 nearby main-sequence stars in order to determine the incidence of "warm" dust disks. All stars were detected by ISO. We used an empirical relation to estimate the photospheric flux of the stars at 25 $\mu$m. We find 5 stars (6%) with excess above the photospheric flux which we attribute to a Vega-like disk. These stars show disk temperatures not warmer than 120 K. Our study indicates that warm disks are relatively rare. Not a single star in our sample older than 400 Myr has a warm disk. We find an upper limit of $M_{\rm disk}\,=~2\times 10^{-5}~M_{\oplus}$ for the mass of the disks which we did not detect.

Key words: stars: planetary systems -- stars: general -- infrared: stars

Offprint request: R. J. Laureijs, Rene.Laureijs@esa.int

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© ESO 2002