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Photometric quality of Dome C for the winter 2008 from ASTEP South

Published online by Cambridge University Press:  24 December 2009

N. Crouzet
Affiliation:
University of Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, BP. 4229, 06304 Nice Cedex 4, France
T. Guillot
Affiliation:
University of Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, BP. 4229, 06304 Nice Cedex 4, France
A. Agabi
Affiliation:
University of Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, BP. 4229, 06304 Nice Cedex 4, France
Y. Fanteï-Caujolle
Affiliation:
University of Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, BP. 4229, 06304 Nice Cedex 4, France
F. Fressin
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
J.-P. Rivet
Affiliation:
University of Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, BP. 4229, 06304 Nice Cedex 4, France
E. Bondoux
Affiliation:
University of Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, BP. 4229, 06304 Nice Cedex 4, France Concordia Station, Dome C, Antarctica
Z. Challita
Affiliation:
University of Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, BP. 4229, 06304 Nice Cedex 4, France Concordia Station, Dome C, Antarctica
L. Abe
Affiliation:
University of Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, BP. 4229, 06304 Nice Cedex 4, France
A. Blazit
Affiliation:
University of Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, BP. 4229, 06304 Nice Cedex 4, France
S. Bonhomme
Affiliation:
University of Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, BP. 4229, 06304 Nice Cedex 4, France
J.-B. Daban
Affiliation:
University of Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, BP. 4229, 06304 Nice Cedex 4, France
C. Gouvret
Affiliation:
University of Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, BP. 4229, 06304 Nice Cedex 4, France
D. Mékarnia
Affiliation:
University of Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, BP. 4229, 06304 Nice Cedex 4, France
F.-X. Schmider
Affiliation:
University of Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, BP. 4229, 06304 Nice Cedex 4, France
F. Valbousquet
Affiliation:
Optique et Vision, 6 bis avenue de l'Estérel, BP. 69, 06162 Juan-Les-Pins, France
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Abstract

ASTEP South is an Antarctic Search for Transiting ExoPlanets in the South pole field, from the Concordia station, Dome C, Antarctica. The instrument consists of a thermalized 10 cm refractor observing a fixed 3.88° × 3.88° field of view to perform photometry of several thousand stars at visible wavelengths (700–900 nm). The first winter campaign in 2008 led to the retrieval of nearly 1600 hours of data. We derive the fraction of photometric nights by measuring the number of detectable stars in the field. The method is sensitive to the presence of small cirrus clouds which are invisible to the naked eye. The fraction of night-time for which at least 50% of the stars are detected is 74% from June to September 2008. Most of the lost time (18.5% out of 26%) is due to periods of bad weather conditions lasting for a few days (“white outs”). Extended periods of clear weather exist. For example, between July 10 and August 10, 2008, the total fraction of time (day+night) for which photometric observations were possible was 60%. This confirms the very high quality of Dome C for nearly continuous photometric observations during the Antarctic winter.

Type
Research Article
Copyright
© EAS, EDP Sciences, 2010

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References

Agabi, K., et al., 2006, ASP, 118, 344 CrossRef
Aristidi, E., et al., 2009, EDP, 499, 955
Crouzet, N., et al., 2009, Transiting Planets, Proc. Int. Astron. Union, IAU Symp., 253, 336
Crouzet, N., Guillot, T., Fressin, F., & Blazit, A., 2007, Astron. Nachr., 328, 805 CrossRef
Fressin, F., Guillot, T., et al., 2005, EAS Publ. Series, 14, 309 CrossRef
Mosser, B., & Aristidi, E., 2007, PASP, 119, 127 CrossRef

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Photometric quality of Dome C for the winter 2008 from ASTEP South
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