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Moreau, J., Bollache, L., Sittler, B., Gilg, O. (2019). La dynamique des populations du lemming face aux changements climatiques. La nature arctique dans un climat d'urgence, 5ème colloque dédié à l’environnement polaire, 12-13 Avril 2019, Cité des Sciences et de l'Industrie, Paris.
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Enstipp M., Bost C.-A., Weimerskirch H. & Y. Handrich. (2019). Thermal challenges during foraging suggest an energetic bottleneck for juvenile king penguins during their early life at sea. ‘SEB’2019 Annual Meeting (Society for Experimental Biology), 2-5th July 2019, Seville, Spain.
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Nebot M., Chaise L., Ancel A., Gilbert C. (2019). Déplacements en mer des éléphants de mer austraux au cours de la mue. 15 émes journées scientifiques du cnfra, 16-17 mai 2019, paris, france.
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N. Fuller, K. L. Klein, J. F. Bottollier-Depois, P. Yaya, Y. Kubo, T. Sato. (2019). Neutron monitors and the evaluation of radiation doses for civil aviation (Vol. 31).
Abstract: Cosmic rays at energies that are able to trigger particle cascades in the Earth's atmosphere are the main source of radiation at aircraft altitudes. In 2018 the International Civil Aviation Organisation (ICAO) identified consortia for a worldwide space weather service that will operate starting November 2019. In this contribution we describe how the Australia-Canada-France-Japan (ACFJ) consortium intends to provide the service monitoring radiation due to galactic cosmic rays and solar energetic particles. It will be shown that neutron monitor measurements from ground are an essential ingredient to assess radiation doses aboard aircraft due to solar energetic particles, while space-borne measurements at lower energies (up to a few hundreds of MeV) may provide valuable additional information. We then briefly describe two types of models used to detect a solar event and evaluate dose rates: a semi-empirical model called SIGLE-RT developed at Paris Observatory, which has been employed since many years in cooperation with Institut de Radioprotection et Sûreté Nucléaire (IRSN) for the a posteriori evaluation of radiation doses for French aviation, and a physics-based model called WASAVIES employing particle transport and air shower calculations developed by National Institute of Information and Communications Technology (NICT), Japan Atomic Energy Agency (JAEA), and others in Japan. The two models are being compared for opposite extremes of recent solar energetic particle events, namely the strong event on 2005 Jan 20 and the rather weak one on 2017 Sep 10. Results will be presented and discussed.
Keywords: 7924 Forecasting 7934 Impacts on technological systems 7944 Ionospheric effects on radio waves SPACE WEATHER
Programme: 227
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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. (2020). Two-colour photometry to search for transiting exoplanets with ASTEP at Dome C, Antarctica.
Abstract: 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.
Programme: 1066
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Crouzet N. (2017). Detection of variable stars and transiting planet candidates with ASTEP at Dome C.
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Samuel N. Mellon, Remko Stuik, Matthew Kenworthy, Eric E. Mamajek, Konstanze Zwintz, Tristan Guillot, Paul Kalas, Geert Jan Talens, Iva Laginja, John Bailey, Blaine Lomberg, Rudi Kuhn, Michael Ireland, Anne-Marie Lagrange, Jason J. Wang, Djamel Mekarnia, Lyu Abe, François-Xavier Schmider, Abdelkrim Agabi, Kevin Stevenson. (2019). Photometric results of the β Pictoris b Hill sphere transit as observed by bRing, ASTEP, BRITE, and the HST.
Abstract: The β Pictoris b Hill Sphere transit occurred between early-2017 and early-2018. During this event, high precision, high cadence photometry of β Pictoris was obtained by the bRing (β Pictoris b Ring) and ASTEP (Antarctic Search for Transiting ExoPlanets) ground-based observatories, the BRITE (Bright Target Explorer) satellite, and the HST (Hubble Space Telescope). The data from each source were combined and analyzed to search for evidence of occultation of the star by circumplanetary matter. While the star's pulsations were detected, none of the surveys detected any unexplained fluctuations, which might have been due to circumplanetary matter. This poster presents the overall light curve of β Pictoris during the Hill sphere transit and presents preliminary estimates of upper limits on the amount of circumplanetary dust at a wide range of orbital radii around the exoplanet β Pictoris b.
Programme: 1066
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Guillot, T. (2018). ASTEP Observations of HD172555: A twin of Beta Pic.
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Mékarnia, D. (2018). Caractérisation de Beta Pictoris et sa planète.
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Mékarnia D., Guillot T., Abe A., Agabi K., Chapellier E., Schmider F.-X. (2019). Exoplanètes avec ASTEP.
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