Fulltext

The non-convex shape of (234) Barbara, the first Barbarian

Tanga, P. ; Carry, B. ; Colas, F. ; Delbo, M. ; Matter, A. ; Hanuš, J. ; Alí Lagoa, V. ; Andrei, A. H. ; Assafin, M. ; Audejean, M. ; Behrend, R. ; Camargo, J. I. B. ; Carbognani, A. ; Cedrés Reyes, M. ; Conjat, M. ; Cornero, N. ; Coward, D. ; Crippa, R. ; de Ferra Fantin, E. ; Devogéle, M. ; Dubos, G. ; Frappa, E. ; Gillon, M. ; Hamanowa, H. ; Jehin, E. ; Klotz, A. ; Kryszczyńska, A. ; Lecacheux, J. ; Leroy, A. ; Manfroid, J. ; Manzini, F. ; Maquet, L. ; Morelle, E. ; Mottola, S. ; Polińska, M. ; Roy, R. ; Todd, M. ; Vachier, F. ; Vera Hernández, C. ; Wiggins, P.

In: Monthly Notices of the Royal Astronomical Society, 2015, vol. 448, no. 4, p. 3382-3390

Add to personal list
    Title
    • The non-convex shape of (234) Barbara, the first Barbarian
    Author
    • Tanga, P.. Laboratoire Lagrange, UMR7293 CNRS, UNS, Observatoire de la Côte d'Azur, Nice, F-06304, France
    • Carry, B.. IMCCE, Observatoire de Paris, UMR8028 CNRS, F-75014 Paris, France
    • Colas, F.. IMCCE, Observatoire de Paris, UMR8028 CNRS, F-75014 Paris, France
    • Delbo, M.. Laboratoire Lagrange, UMR7293 CNRS, UNS, Observatoire de la Côte d'Azur, Nice, F-06304, France
    • Matter, A.. Laboratoire Lagrange, UMR7293 CNRS, UNS, Observatoire de la Côte d'Azur, Nice, F-06304, France
    • Hanuš, J.. Laboratoire Lagrange, UMR7293 CNRS, UNS, Observatoire de la Côte d'Azur, Nice, F-06304, France
    • Alí Lagoa, V.. Laboratoire Lagrange, UMR7293 CNRS, UNS, Observatoire de la Côte d'Azur, Nice, F-06304, France
    • Andrei, A. H.. Observatório do Valongo/UFRJ, 20-080-090 Rio de Janeiro, Brazil
    • Assafin, M.. Observatório do Valongo/UFRJ, 20-080-090 Rio de Janeiro, Brazil
    • Audejean, M.. CdR & CdL Group: Lightcurves of Minor Planets and Variable Stars, Observatoire de Genève, CH-1290 Sauverny, Switzerland
    • Behrend, R.. CdR & CdL Group: Lightcurves of Minor Planets and Variable Stars, Observatoire de Genève, CH-1290 Sauverny, Switzerland
    • Camargo, J. I. B.. Observatório Nacional/MCTI, 20921-400 Rio de Janeiro, Brazil
    • Carbognani, A.. Osservatorio Astronomico della regione autonoma Valle d'Aosta, Saint-Barthélemy, Loc. Lignan, I-35 11020 Nus (Aosta), Italy
    • Cedrés Reyes, M.. Agrupación Astronómica de Fuerteventura, E-35600 Puerto del Rosario, Spain
    • Conjat, M.. Observatoire de Cabris, F-06530 Cabris, France
    • Cornero, N.. CdR & CdL Group: Lightcurves of Minor Planets and Variable Stars, Observatoire de Genève, CH-1290 Sauverny, Switzerland
    • Coward, D.. Department of Imaging and Applied Physics, Curtin University of Technology, Bentley WA 6102, Australia
    • Crippa, R.. CdR & CdL Group: Lightcurves of Minor Planets and Variable Stars, Observatoire de Genève, CH-1290 Sauverny, Switzerland
    • de Ferra Fantin, E.. Agrupación Astronómica de Fuerteventura, E-35600 Puerto del Rosario, Spain
    • Devogéle, M.. Institut d'Astrophysique, Géophysique et Océanographie, Université de Liège, B-4000 Liège, Belgium
    • Dubos, G.. Association des Utilisateurs de Détecteurs Électroniques (AUDE), F-75014 Paris, France
    • Frappa, E.. Euraster, F-42000 St Etienne, France
    • Gillon, M.. Institut d'Astrophysique, Géophysique et Océanographie, Université de Liège, B-4000 Liège, Belgium
    • Hamanowa, H.. CdR & CdL Group: Lightcurves of Minor Planets and Variable Stars, Observatoire de Genève, CH-1290 Sauverny, Switzerland
    • Jehin, E.. Institut d'Astrophysique, Géophysique et Océanographie, Université de Liège, B-4000 Liège, Belgium
    • Klotz, A.. CNRS, IRAP, F-31028 Toulouse, France
    • Kryszczyńska, A.. Astronomical Observatory Inst., Faculty of Physics, Adam Mickiewicz University, PL-67-712 Poznań, Poland
    • Lecacheux, J.. LESIA-Observatoire de Paris, CNRS, UPMC Univ. Paris 06, Univ. Paris-Diderot, F-92195 Meudon, France
    • Leroy, A.. CdR & CdL Group: Lightcurves of Minor Planets and Variable Stars, Observatoire de Genève, CH-1290 Sauverny, Switzerland
    • Manfroid, J.. Institut d'Astrophysique, Géophysique et Océanographie, Université de Liège, B-4000 Liège, Belgium
    • Manzini, F.. CdR & CdL Group: Lightcurves of Minor Planets and Variable Stars, Observatoire de Genève, CH-1290 Sauverny, Switzerland
    • Maquet, L.. IMCCE, Observatoire de Paris, UMR8028 CNRS, F-75014 Paris, France
    • Morelle, E.. CdR & CdL Group: Lightcurves of Minor Planets and Variable Stars, Observatoire de Genève, CH-1290 Sauverny, Switzerland
    • Mottola, S.. Institute of Planetary Research, German Aerospace Center, D-12489 Berlin, Germany
    • Polińska, M.. Astronomical Observatory Inst., Faculty of Physics, Adam Mickiewicz University, PL-67-712 Poznań, Poland
    • Roy, R.. CdR & CdL Group: Lightcurves of Minor Planets and Variable Stars, Observatoire de Genève, CH-1290 Sauverny, Switzerland
    • Todd, M.. Department of Imaging and Applied Physics, Curtin University of Technology, Bentley WA 6102, Australia
    • Vachier, F.. IMCCE, Observatoire de Paris, UMR8028 CNRS, F-75014 Paris, France
    • Vera Hernández, C.. Agrupación Astronómica de Fuerteventura, E-35600 Puerto del Rosario, Spain
    • Wiggins, P.. Wiggins Observatory, Tooele, UT 84074, USA
    Document Type
    • Postprint
    Language
    • English
    Published in
    • Monthly Notices of the Royal Astronomical Society, 2015, vol. 448, no. 4, p. 3382-3390. Oxford University Press
    Other Version
    OAI-PMH Identifier
    • oai:doc.rero.ch:304260
    Summary
    Asteroid (234) Barbara is the prototype of a category of asteroids that has been shown to be extremely rich in refractory inclusions, the oldest material ever found in the Solar system. It exhibits several peculiar features, most notably its polarimetric behaviour. In recent years other objects sharing the same property (collectively known as ‘Barbarians') have been discovered. Interferometric observations in the mid-infrared with the ESO VLTI (Very Large Telescope Interferometer) suggested that (234) Barbara might have a bi-lobated shape or even a large companion satellite. We use a large set of 57 optical light curves acquired between 1979 and 2014, together with the timings of two stellar occultations in 2009, to determine the rotation period, spin-vector coordinates, and 3-D shape of (234) Barbara, using two different shape reconstruction algorithms. By using the light curves combined to the results obtained from stellar occultations, we are able to show that the shape of (234) Barbara exhibits large concave areas. Possible links of the shape to the polarimetric properties and the object evolution are discussed. We also show that VLTI data can be modelled without the presence of a satellite