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14 results on '"A. Lagain"'

1. Recalibration of the lunar chronology due to spatial cratering-rate variability

Author

Lagain, Anthony, primary, Devillepoix, Hadrien A.R., additional, Vernazza, Pierre, additional, Robertson, Darrel, additional, Granvik, Mikael, additional, Pokorny, Petr, additional, Ozerov, Anthony, additional, Shober, Patrick M., additional, Jorda, Laurent, additional, Servis, Konstantinos, additional, Fairweather, John H., additional, Quesnel, Yoann, additional, and Benedix, Gretchen K., additional

Published
2024
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9. Impact cratering rate consistency test from ages of layered ejecta on Mars

Author

François Costard, Mark A. Wieczorek, Anthony Lagain, Sylvain Bouley, David Baratoux, Géosciences Paris Sud (GEOPS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Institut de Mécanique Céleste et de Calcul des Ephémérides (IMCCE), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Lille-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut de recherche en astrophysique et planétologie (IRAP), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Interactions et dynamique des environnements de surface (IDES), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Joseph Louis LAGRANGE (LAGRANGE), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Géosciences Paris Saclay (GEOPS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, and COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
education.field_of_study, 010504 meteorology & atmospheric sciences, Population, Mars, Flux, Astronomy and Astrophysics, Mars Exploration Program, Geophysics, 01 natural sciences, Consistency test, [SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology, Impact crater, Impact craters, Space and Planetary Science, 0103 physical sciences, Layered ejecta craters, Impact rate, Ejecta, education, Constant (mathematics), 010303 astronomy & astrophysics, Geology, 0105 earth and related environmental sciences, Chronology
Abstract

International audience; Ages of geological units of planetary bodies are determined from impact crater counts on their surface. These ages are model-dependent, and several models largely used in the community assume a constant production function and a constant cratering rate over the last 3 Ga. We have mapped the population of small impact craters (>200 m in diameter) formed over a population of large impact craters (>5 km in diameter) with layered ejecta on Acidalia Planitia, Mars. We have deduced the age of each large impact crater under the assumption of a constant impact rate and constant production function. The impact rate inferred from this set of ages is, however, not constant and show a significant increasing during the last~1 Ga compared to chronology models commonly used. We interpret this inconsistency as an evidence for temporal variations in the size-frequency distribution (SFD) of impactors in the main belt, consistent with recent studies argued for a late increasing of the large impactor flux on Earth and the Moon.

Published
2020
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10. VESPA: A community-driven Virtual Observatory in Planetary Science

Author

Erard, S., primary, Cecconi, B., additional, Le Sidaner, P., additional, Rossi, A.P., additional, Capria, M.T., additional, Schmitt, B., additional, Génot, V., additional, André, N., additional, Vandaele, A.C., additional, Scherf, M., additional, Hueso, R., additional, Määttänen, A., additional, Thuillot, W., additional, Carry, B., additional, Achilleos, N., additional, Marmo, C., additional, Santolik, O., additional, Benson, K., additional, Fernique, P., additional, Beigbeder, L., additional, Millour, E., additional, Rousseau, B., additional, Andrieu, F., additional, Chauvin, C., additional, Minin, M., additional, Ivanoski, S., additional, Longobardo, A., additional, Bollard, P., additional, Albert, D., additional, Gangloff, M., additional, Jourdane, N., additional, Bouchemit, M., additional, Glorian, J.-M., additional, Trompet, L., additional, Al-Ubaidi, T., additional, Juaristi, J., additional, Desmars, J., additional, Guio, P., additional, Delaa, O., additional, Lagain, A., additional, Soucek, J., additional, and Pisa, D., additional

Published
2018
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11. Preparation et dimerisation de la butene-3 thione-3 et de la methyl-4 pentene-3 thione-2 (1)

Author

Pierre Beslin, D. Lagain, and Jean Vialle

Subjects
Stereochemistry, Chemistry, Organic Chemistry, Drug Discovery, Thermal decomposition, Biochemistry, Medicinal chemistry
Abstract

3-buten-2-thione and 4-methyl-3-penten-2 thione are prepared by a retro- Diels reaction using flahs thermolysis technique. Their particular mode of dimerisation is elucidated.

Published
1979
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12. Préparation de thiocétones acycliques α-insaturées. dimérisation régiosélective en 4h-dithiine-1,3

Author

C. Minot, D. Lagain, Jean Vialle, and Pierre Beslin

Subjects
chemistry.chemical_classification, NMR spectra database, chemistry.chemical_compound, Monomer, Ketone, chemistry, Stereochemistry, Organic Chemistry, Drug Discovery, Thermal decomposition, Spectral data, Biochemistry, Medicinal chemistry
Abstract

α-Unsaturated acyclic thioketones 6 a–d were prepared by a retro-Diels-Alder reaction using flash thermolysis technique. They were detected at low temperature (blue coloured pyrolysate) but dimerize in solution as soon as the temperature rose to −60° (case 6 a–c) and −20° (case 6 d). The structure of 6 d was established by UV and NMR spectra taken at −60°. Dimeric products were proved to be 4H - 1,3 dithiin by spectral data and by univocal synthesis of 7 c and 7 d from the corresponding monomeric ketone. 1–3 Dithiin 7 d was isomerized at 190° into the thermodynamic isomer ( 8 ). This observed orientation of dimerisation agrees with theorical results obtained from molecular frontier orbital calculations.

Published
1981
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