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The parsec program: a large sample of brown dwarf trigonometric parallaxes

Published online by Cambridge University Press:  26 February 2013

Alexandre H. Andrei ,
Richard L. Smart ,
Beatrice Bucciarelli ,
Jucira L. Penna ,
Federico Marocco ,
Mario G. Lattanzi ,
Mariateresa Crosta  and
Ramakrishna Teixeira
Alexandre H. Andrei
Affiliation:
Observatório Nacional/MCTI, Brazil; Osservatorio Astrofisico di Torino/INAF, Italy; SYRTE/Observatoire de Paris, France; Observatório do Valongo/UFRJ, Brazil email: oat1@on.br Present address: Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China
Richard L. Smart
Affiliation:
Osservatorio Astrofisico di Torino/INAF, Italy
Beatrice Bucciarelli
Affiliation:
Osservatorio Astrofisico di Torino/INAF, Italy
Jucira L. Penna
Affiliation:
Observatório Nacional/MCTI, Brazil
Federico Marocco
Affiliation:
CAR/University of Hertfordshire, United Kingdom
Mario G. Lattanzi
Affiliation:
Osservatorio Astrofisico di Torino/INAF, Italy
Mariateresa Crosta
Affiliation:
Osservatorio Astrofisico di Torino/INAF, Italy
Ramakrishna Teixeira
Affiliation:
IAG/Universidade de São Paulo, Brazil
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Abstract

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We report on the parsec program, which observed 140 L and T dwarfs on a regular basis from 2007 to 2011, using the WIFI camera on the ESO/2.2 m telescope. Trigonometric parallaxes at 5 mas precision are derived for 49 objects, and mas yr−1-level proper motions are derived for approximately 200,000 objects in the same fields. We discuss image cleaning, object centroiding, and astrometric methods, in particular three different approaches for trigonometric parallax determination.

Keywords

astrometrystars: low-massbrown dwarfsstars: luminosity function
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S289: Advancing the Physics of Cosmic Distances , August 2012 , pp. 48 - 51
Copyright
Copyright © International Astronomical Union 2013

References

Andrei, A. H., Smart, R. L., Penna, J. L., et al. 2011, AJ, 141, 54Google Scholar
Bucciarelli, B., Andrei, A. H., Smart, R. L., et al. 2010, Journees Systeme de Reference Space–Temporel 2010, p. 105Google Scholar
Smart, R. L., Lattanzi, M. G., Bucciarelli, B., et al. 2003, A&A, 404, 317Google Scholar
Marocco, F., Andrei, A. H., Smart, R. L., et al. 2012, AJ, submittedGoogle Scholar