ASTEP

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ASTEP

Post by Borislav on 19th July 2010, 6:24 pm

http://www.obs-hp.fr/ohp2010/submitted_abstracts-1.pdf

Title : ASTEP: Towards the detection and characterization of exoplanets from Dome C
The Concordia base in Dome C, Antarctica, is an extremely promising site for photometric
astronomy due to the 3-month long night during the Antarctic winter, favorable weather
conditions, and low scintillation. The ASTEP project (Antarctic Search for Transiting
ExoPlanets) is a pilot project to discover transiting planets, and understand the limits of
visible photometry from this site. ASTEP South is the first phase of the project. The
instrument is a fixed 10 cm refractor with a 4k x 4k CCD camera in a thermalized box,
pointing continuously a 3.88 x 3.88 field of view centered on the celestial south pole. The
instrument observed nearly continuously during the 2008 and 2009 Antarctic winters, and
the data are of good quality. The weather conditions are estimated from the number of
stars detected in the field. For the 2008 winter, the statistics are between 56.3% and
68.4% of excellent weather, 17.9% to 30% of veiled weather and 13.7% of bad weather.
Using these results, we show that the detection efficiency of transiting exoplanets in one
given field is improved at Dome C compared to a temperate site such as La Silla (Crouzet
et al. A&A 2010). The second phase of the project is ASTEP 400, an equatorial 40 cm
telescope entirely designed and built for photometry under the extreme conditions of the
Antarctic winter. The instrument is now installed at Concordia. First tests showed that the
PSFs are well in the specifications across the field of view. ASTEP 400 has been
functioning nominally since the beginning of the first campaign in March 2010, and
continuous observations have been carried out. We obtain a dispersion close to 200 ppm
for 12 magnitude stars for 1 month lightcurves folded over ~1 day. This shows the high

potential of Dome C for photometry, future planet discoveries and planet characterization.

Antarctica is the best place for ground-based transit surveys

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Re: ASTEP

Post by Borislav on 20th July 2010, 2:56 pm

http://nexsci.caltech.edu/workshop/2010/pops/Crouzet_pop.pdf

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Re: ASTEP

Post by Lazarus on 13th November 2012, 6:53 pm

ASTEP South: a first photometric analysis
http://arxiv.org/abs/1211.2772

Including a detection of an F+M binary

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