Bibcode
Crouzet, N.; Chapellier, E.; Guillot, T.; Mékarnia, D.; Agabi, A.; Fanteï-Caujolle, Y.; Abe, L.; Rivet, J.-P.; Schmider, F.-X.; Fressin, F.; Bondoux, E.; Challita, Z.; Pouzenc, C.; Valbousquet, F.; Bayliss, D.; Bonhomme, S.; Daban, J.-B.; Gouvret, C.; Blazit, A.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 619, id.A116, 22 pp.
Advertised on:
11
2018
Revista
Número de citas
9
Número de citas referidas
9
Descripción
Context. Dome C in Antarctica is a promising site for photometric
observations thanks to the continuous night during the Antarctic winter
and favorable weather conditions. Aims.We developed instruments to
assess the quality of this site for photometry in the visible and to
detect and characterize variable objects through the Antarctic Search
for Transiting ExoPlanets (ASTEP) project. Methods: Here, we
present the full analysis of four winters of data collected with ASTEP
South, a 10 cm refractor pointing continuously toward the celestial
south pole. We improved the instrument over the years and developed
specific data reduction methods. Results: We achieved nearly
continuous observations over the winters. We measure an average sky
background of 20 mag arcsec-2 in the 579-642 nm bandpass. We
built the lightcurves of 6000 stars and developed a model to infer the
photometric quality of Dome C from the lightcurves themselves. The
weather is photometric 67.1 ± 4.2% of the time and veiled 21.8
± 2.0% of the time. The remaining time corresponds to poor
quality data or winter storms. We analyzed the lightcurves of σ
Oct and HD 184465 and find that the amplitude of their main frequency
varies by a factor of 3.5 and 6.7 over the four years, respectively. We
also identify 34 new variable stars and eight new eclipsing binaries
with periods ranging from 0.17 to 81 days. Conclusion. The phase
coverage that we achieved with ASTEP South is exceptional for a
ground-based instrument and the data quality enables the detection and
study of variable objects. These results demonstrate the high quality of
Dome C for photometry in the visible and for time series observations in
general.
Lightcurves are only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr
(ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/619/A116
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