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| cOmetary GRains and Early Solar System Evolution: Isotopic analyses of cometary polar micrometeorites | |
| 项目编号 | ANR-11-BS56-0026 |
| Monsieur Jean DUPRAT | |
| 项目主持机构 | CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE - DELEGATION REGIONALE ILE-DE-FRANCE SECTEUR SUD |
| 开始日期 | 2012 |
| 结束日期 | 2016-1-01 |
| 英文摘要 | The general framework of the present project is the astrophysical context of the solar system formation and its evolution during the first millions of years after the gravitational collapse of the proto-Sun. It is in the continuity of a previous ANR (MICMET-ISO, 2005-2008) on the study of the asteroid-comet continuum through the analyses of micrometeorites (interplanetary dust particles) collected from central Antarctic snow (CONCORDIA Collection). Major results of our previous ANR program include: (i) the discovery of a new type of interplanetary dust (i.e. ultracarbonaceous micrometeorites, UCAMMs) of most probable cometary origin (Duprat et al., Science 2010), (ii) the evaluation of the maximum mass of short lived radionuclides that can be produced by irradiation in the early solar system (Duprat & Tatischeff ApJ 2007). This latter theoretical work allowed us to set constraints on the origin of extinct radioactivities that might be identified in cometary samples such as STARDUST samples or UCAMMs. From these results, our new program OGRESSE proposes to tackle several fundamental questions: - Is it possible to quantify the upper limit on interstellar material in cometary samples? - What is the origin of organic matter in the protoplanetary disk? - Is it possible to conceive a coherent and self-consistent astrophysical scenario to account for the origin of the short-lived radionuclides present in the protoplanetary disk and how are they related to the formation of the solar system? This OGRESSE multitask program will involve isotopic analyses of cometary UCAMMs to investigate both the interstellar heritage of cometary grains and the origin of organic matter (OM) in the solar system. The latter will benefit from instrumental developments on secondary ion mass spectrometry using state-of-the-art instruments (NanoSIMS). In parallel, the input from a runaway Wolf-Rayet star in the protosolar nebula will be theoretically estimated. We will also search for new objects in the CSNSM micrometeorite collections, and open them to the international community through the development of a digitized web-based database. The UCAMMs from the CONCORDIA collection have no counterparts in any other collection of extraterrestrial matter, but they show similarities with the CHON particles observed in comet Halley in 1986. UCAMMs are most probably of cometary origin, and they are more than 10 times more massive than the comet Wild 2 samples returned by the STARDUST mission. The UCAMMs represent a unique opportunity to study an ultra-primitive OM reservoir from the cold regions of the protoplanetary disk, and its associated mineral phases, without any chemical processing of the samples. To assess the interstellar heritage of the protosolar nebula and the dynamics of the protoplanetary disk, we will use isotopic analyses to quantify the presolar grain concentration of UCAMMs. To shed light on physico-chemical processes acting in the cold regions of the protoplanetary disk, we will study the isotopic compositions of light elements (H and N) in the UCAMM OM, in comparison with those of comet Wild2 samples. We will develop analytical procedures in secondary ion mass spectrometry (SIMS) using the polyatomic secondary (ionic) emission (PSE) to improve the precision of isotopic measurements with the state-of-the-art NanoSIMS. In the continuity of the scenario in which the solar system formed at the vicinity of a runaway Wolf-Rayet star (Tatischeff, Duprat et al., ApJ 2010), we propose to study from a theoretical point of view the implications of this specific astrophysical context on the isotopic heritage expected in the protoplanetary disk. Finally, we propose to open the unique resources of the CONCORDIA collection to the international community. In order to achieve this goal, we need to identify and characterize more UCAMM particles, search for other types of exotic particles, and create a web-based database for all types of micrometeorites. |
| 资助机构 | FR-ANR |
| 项目类型 | Blanc - SIMI 5-6 - Environnement, Terre et Espace (Blanc SIMI 5-6) 2011 |
| URL | http://www.agence-nationale-recherche.fr/en/anr-funded-project/?solr=run&tx_lwmsuivibilan_pi2%5BCODE%5D=ANR-11-BS56-0026 |
| 国家 | FR |
| 语种 | 英语 |
| 文献类型 | 项目 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/70924 |
| 推荐引用方式 GB/T 7714 | Monsieur Jean DUPRAT.cOmetary GRains and Early Solar System Evolution: Isotopic analyses of cometary polar micrometeorites.2012. |
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