Alignment in star-debris disc systems seen by Herschel

Greaves, J. S. and Kennedy, G. M. and Thureau, N. and Eiroa, C. and Marshall, J. P. and Maldonado, J. and Matthews, B. C. and Olofsson, G. and Barlow, M. J. and Moro-Martin, A. and Sibthorpe, B. and Absil, O. and Ardila, D. R. and Booth, M. and Broekhoven-Fiene, H. and Brown, D. J. A. and Collier Cameron, A. and Del Burgo, C. and Di Francesco, J. and Eisloffel, J. and Duchene, G. and Ertel, S. and Holland, W. S. and Horner, J. and Kalas, P. and Kavelaars, J. J. and Lestrade, J. -F. and Vican, L. and Wilner, D. J. and Wolf, S. and Wyatt, M. C. (2014) Alignment in star-debris disc systems seen by Herschel. Monthly Notices of the Royal Astronomical Society: Letters, 438 (1). L31-L35. ISSN 1745-3925

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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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2013 The Authors. This publication is copyright. It may be reproduced in whole or in part for the purposes of study, research, or review, but is subject to the inclusion of an acknowledgment of the source.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 22 Jul 2014 06:02
Last Modified: 10 Mar 2017 03:05
Uncontrolled Keywords: circumstellar matter; planetary systems; infrared; stars
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020102 Astronomical and Space Instrumentation
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020109 Space and Solar Physics
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1093/mnrasl/slt153

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