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Crouzet N., Guillot T., Abe L., Mékarnia D., Agabi K., Bresson Y., Bailet C., Mauclert N., Heras A., Ferruit P., Triaud A., Lagrange A., Schmider ., Giardino G., Isaak K., Kohley R., Michalik D., Foing B., Pilbratt G., Stankov A., Gondoin P., Birkmann S., O'Rourke L. |
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Title |
Two-colour photometry to search for transiting exoplanets with ASTEP at Dome C, Antarctica |
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2020 |
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Scar 2020 open science conference |
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Dome C in Antarctica provides exceptional conditions for photometry thanks to the continuous night during the Antarctic winter, a high clear sky fraction, low wind speeds, and a cold and dry atmosphere. The ASTEP project (Antarctic Search for Transiting ExoPlanets) aims at detecting and characterising transiting exoplanets and qualifying this site for photometry in the visible. The main instrument, a 40 cm telescope, has been designed to perform high precision photometry under the extreme conditions of the Antarctic winter and has operated at the Concordia station since 2010. It will be upgraded with two new cameras and a new camera box in order to provide simultaneous two-colour photometry and substantially increase its throughput. The new setup will be operational for the winter campaign 2021 and will allow us to discover transiting exoplanets orbiting bright stars in particular low mass exoplanets, temperate exoplanets, exoplanets around young stars, and to refine the ephemerides of exoplanets discovered by the TESS mission. These observations will provide targets for first characterisation with the CHEOPS mission and atmospheric studies with the JWST and ARIEL missions. In this talk, I will describe the science goals and the upgrade of the ASTEP telescope. |
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7806 |
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Crouzet N., Mékarnia D., Agabi K., Guillot T., Abe L., Bayliss D., Deeg H., Murgas F., Palle E., Schmider F. |
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Title |
Searching for long period transiting exoplanets with ASTEP South at Dome C, Antarctica |
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2020 |
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SCAR 2020 Open Science Conference (abstract only) |
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Much of our understanding of gas giant exoplanets come from those transiting in front of bright stars at short orbital separations (P ~ 3 days, a ~ 0.05 au). However, these |
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Bachelor's thesis |
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7807 |
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Martischang J-P. |
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Title |
Exoplanètes : sélection de calibrateurs et ajustements de transits |
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2020 |
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Master, Ecole Nationale d'art et Métiers (ENSAM), Paris, juin-août 2020 |
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1066 |
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7817 |
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Crouzet, N., Guillot T., Abe L., Mékarnia D., Agabi A., Schmider F.-X., Vauglin I. |
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Title |
Astronomie à Concordia : projets et besoins |
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2020 |
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Prospective INSU 2020, 6 février 2020, Paris, France |
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1066 |
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7828 |
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Author |
Guillot T. |
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Title |
Discovering Exoplanets from Antarctica with ASTEP |
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Conference - International - Communication |
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2020 |
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On the way to Antarctica seminar, 29 october 2020 |
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1066 |
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yes |
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7829 |
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Crouzet N., et al. |
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Title |
Towards a two-colour photometer at Dome C, Antartica |
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Communication |
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2020 |
Publication |
ESA SCI Science Workshop #13, 1-3 December 2020, Virtual Meeting |
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1066 |
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7830 |
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Crouzet N., et al. |
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Towards ASTEP+, a two-color photometric telescope at Dome C, Antarctica |
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Conference - International - Communication |
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2020 |
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SPIE Astronomical Telescopes + Instrumentation (AS20), online, 14-18 December 2020 |
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Paper 11447-23 |
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1066 |
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7831 |
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Ricaud, P., Del Guasta M., Bazile E., Azouz N., Lupi A., Durand P., Attié J.-L., Veron D., Guidard V., Grigioni P. |
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Title |
Supercooled Liquid Water Cloud observed, analysed and modelled at the Top of the Planetary Boundary Layer above Dome C |
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Communication |
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2020 |
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Antarctica, SCAR, Visio, Hobart, Australia, August 2020 |
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7839 |
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Philippe Ricaud, Paolo Grigioni, Romain Roehrig, Pierre Durand, Dana E. Veron |
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Title |
Trends in Atmospheric Humidity and Temperature above Dome C |
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Communication |
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2020 |
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Antarctica Evaluated from Observations and Reanalyses, SCAR, Visio, Hobart, Australia, August 2020. |
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7840 |
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Barbero A. Grilli R., Blouzon C., Caillon N., Savarino, J. |
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New Observations to Better Constrain NOx (NO + NO2) Concentrations on the Antarctic Plateau and to Resolve the Ambiguity in the NO2:NO Ratio |
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Communication |
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2020 |
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AGU Fall Meeting 2020, 1-17 December 2020 San Francisco, USA |
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High southern latitude regions present specificities that are highly relevant for studying the climate in connection with the atmospheric chemistry. Contrary to regions of the rest of the world, Antarctica is still considered as a pristine environment not yet influenced by predominant anthropogenic emissions (with the notable exceptions of GHG) and thus represents the last continental-size natural laboratory. Polar snow-air-radiation interactions and the specific oxidant character of the polar atmosphere are key in order to decipher the right information buried in the ice and the current chemical stability of the polar atmosphere. Previous Antarctic campaigns have shown atmospheric similarities between the Antarctic Plateau (at Dome C, Concordia) and other regions. However, several differences are yet to be explained: the large NO2:NO ratios previously found in ambient air indicates the existence of an unknown source of NO2 above the Antarctic Plateau. These observations question either the reliability of previous measurements or the lack of our understanding of the NOx chemistry. Novel optical instruments based on the incoherent broadband cavity enhanced absorption spectroscopy technique (IBBCEAS) were developed. The instruments can measure simultaneously NO2, NOx and NO with detection limits of 11, 10 and 21 ppt, respectively (1σ) within 22 minutes of measurements. The two compact and transportable instruments were deployed during the 2019/20 Dome C summer campaign. Atmospheric measurements together with flux chamber experiments were performed for determining the snowpack NOx emissions and the NO2:NO ratio. The observations seem to differ from the conclusions of the previous Antarctic campaigns. Assuming steady state and maximum radiations, the theoretical NO2:NO ratio from the period observed in December was calculated to be 0.38 ± 0.15 and 0.31 ± 0.12 in January. The instruments measured a ratio close to steady state in December (0.25 ± 0.25) while the ratio observed in January (1.248 ± 0.792) indicates the presence of a strong NO oxidant or an unknown source of NO2. Flux chamber experiments on different types of snow were done during this campaign, and the results will help deepen our knowledge of Antarctic atmospheric chemistry. |
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7864 |
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