[en] Many nearby main-sequence stars have been searched for debris using the far-infrared Herschel satellite, within the DEBRIS, DUNES and Guaranteed-Time Key Projects. We discuss here 11 stars of spectral types A-M where the stellar inclination is known and can be compared to that of the spatially resolved dust belts. The discs are found to be well aligned with the stellar equators, as in the case of the Sun's Kuiper belt, and unlike many close-in planets seen in transit surveys. The ensemble of stars here can be fitted with a star-disc tilt of ≲ 10°. These results suggest that proposed mechanisms for tilting the star or disc in fact operate rarely. A few systems also host imaged planets, whose orbits at tens of au are aligned with the debris discs, contrary to what might be expected in models where external perturbers induce tilts.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Greaves, J. S.; SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, UK
Kennedy, G. M.; Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
Thureau, N.; SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, UK
Eiroa, C.; Dpt. Física Teórica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, E-28049 Madrid, Spain
Marshall, J. P.; Dpt. Física Teórica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, E-28049 Madrid, Spain
Maldonado, J.; Dpt. Física Teórica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, E-28049 Madrid, Spain
Matthews, B. C.; National Research Council of Canada, 5071 West Saanich Road., Victoria, BC V9E 2E7, Canada ; University of Victoria, Finnerty Road, Victoria, BC V8W 3P6 Canada
Olofsson, G.; Stockholm Observatory, SCFAB, SE-106 91 Stockholm, Sweden
Barlow, M. J.; Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
Moro-Martín, A.; Centro de Astrobiología (CSIC-INTA), E-28850 Torrejón de Ardoz, Madrid, Spain
Sibthorpe, B.; UK Astronomy Technology Center, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK ; SRON, Postbus 800, NL-9700 AV Groningen, the Netherlands
Absil, Olivier ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Ardila, D. R.; NASA Herschel Science Center, IPAC, MS 100-22, California Institute of Technology, Pasadena, CA 91125, USA
Booth, M.; University of Victoria, Finnerty Road, Victoria, BC V8W 3P6 Canada
Broekhoven-Fiene, H.; University of Victoria, Finnerty Road, Victoria, BC V8W 3P6 Canada
Brown, D. J. A.; SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, UK
Cameron, A. Collier; SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, UK
del Burgo, C.; Instituto Nacional de Astrofísica, Óptica y Electrónica, Luis Enrique Erro 1, Sta. Ma. Tonantzintla, Puebla, Mexico
Di Francesco, J.; National Research Council of Canada, 5071 West Saanich Road., Victoria, BC V9E 2E7, Canada ; University of Victoria, Finnerty Road, Victoria, BC V8W 3P6 Canada
Duchêne, G.; Astronomy Department, University of California, Berkeley, CA 94720, USA ; IPAG, Université Joseph Fourier / CNRS, 414 Rue de la Piscine, F-38400 St-Martin d'Hères, France
Ertel, S.; IPAG, Université Joseph Fourier / CNRS, 414 Rue de la Piscine, F-38400 St-Martin d'Hères, France
Holland, W. S.; UK Astronomy Technology Center, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
Horner, J.; Department of Astrophysics and Optics, School of Physics, University of New South Wales, Sydney, NSW 2052, Australia
Kalas, P.; Thüringer Landessternwarte, Sternwarte 5, D-07778, Tautenburg, Germany ; SETI Institute, Mountain View, CA 94043, USA
Kavelaars, J. J.; National Research Council of Canada, 5071 West Saanich Road., Victoria, BC V9E 2E7, Canada ; University of Victoria, Finnerty Road, Victoria, BC V8W 3P6 Canada
Lestrade, J.-F.; Observatoire de Paris - CNRS, 77 Av. Denfert Rochereau, F-75014 Paris, France
Vican, L.; Department of Physics and Astronomy, University of California, Los Angeles, CA 90095, USA
Wilner, D. J.; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
Wolf, S.; Institut für Theoretische Physik und Astrophysik, Universität zu Kiel, Liebnizstr. 15, D-24118 Kiel, Germany
Wyatt, M. C.; Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK)
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