Nitrogen in Titan’s Atmospheric Aerosol Factory

Carrasco, Nathalie; Westlake, J. H.; Pernot, Pascal; Waite, Hunter

doi:10.1007/978-1-4614-5191-4_11

Cited by 4 publications

(3 citation statements)

References 32 publications

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“…Mid-and far-IR absorption properties of Titan's aerosol analogues helped to identify and confirm aerosols signatures obtained by the Visible and Infrared Mapping Spectrometer (VIMS) and the Composite Infrared Spectrograph (CIRS) instruments Sebree et al 2014), but also identified some limitations of the laboratory approach through discrepancies between laboratory analogues and Titan's aerosols signatures Imanaka et al 2012;Kim et al 2011). Mass analysis at high resolution of laboratory analogues also provided some leads on the chemical composition of the large species detected in Titan's ionosphere by the Cassini Plasma Spectrometer (CAPS) instrument at low mass resolution (Carrasco et al 2013a(Carrasco et al , 2013b. Moreover, laboratory analogues are used as model organic matter to calibrate and optimize space instrumentation for future space missions in order to detect and analyze organics in space.…”

Section: Simulation Facilities For Organic Aerosols In Planetary Atmomentioning

confidence: 54%

“…Pressure and temperature are strongly dependent on the experiments, and can hardly reproduce the whole range and extreme conditions occurring in real atmospheres. As developed in (Carrasco et al 2013a(Carrasco et al , 2013b, wall effects can be encountered at low pressure conditions, when the mean free path exceeds the typical dimensions of the photo-reactor. Considering these constraints, it is important to propose and develop various and complementary experiments.…”

Section: Simulation Facilities For Organic Aerosols In Planetary Atmomentioning

confidence: 99%

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Earth as a Tool for Astrobiology—A European Perspective

et al. 2017

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Scientists use the Earth as a tool for astrobiology by analyzing planetary field analogues (i.e. terrestrial samples and field sites that resemble planetary bodies in our Solar System). In addition, they expose the selected planetary field analogues in simulation chambers to conditions that mimic the ones of planets, moons and Low Earth Orbit (LEO) space conditions, as well as the chemistry occurring in interstellar and cometary ices. This paper reviews the ways the Earth is used by astrobiologists: (i) by conducting planetary field analogue studies to investigate extant life from extreme environments, its metabolisms, adaptation strategies and modern biosignatures; (ii) by conducting planetary field analogue studies to investigate extinct life from the oldest rocks on our planet and its biosignatures; (iii) by exposing terrestrial samples to simulated space or planetary environments and producing a sample analogue to investigate changes in minerals, biosignatures and microorganisms. The European Space Agency (ESA) created a topical team in 2011 to investigate recent activities using the Earth as a tool for astrobiology and to formulate recommendations and scientific needs to improve ground-based astrobiological research. Space is an important tool for astrobiology (see Horneck et al. in Astrobiology, 16:201-243, 2016;Cottin et al., 2017), but access to space is limited. Complementing research on Earth provides fast access, more replications and higher sample throughput. The major conclusions of the topical team and suggestions for the future include more scientifically qualified calls for field campaigns with planetary analogy, and a centralized point of contact at ESA or the EU for the organization of a survey of such expeditions. An improvement of the coordinated logistics, infrastructures and funding system supporting the combination of field work with planetary simulation investigations, as well as an optimization of the scientific return and data processing, data storage and data distribution is also needed. Finally, a coordinated EU or ESA education and outreach program would improve the participation of the public in the astrobiological activities.

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Section: Simulation Facilities For Organic Aerosols In Planetary Atmomentioning

confidence: 54%

Section: Simulation Facilities For Organic Aerosols In Planetary Atmomentioning

confidence: 99%

Earth as a Tool for Astrobiology—A European Perspective

et al. 2017

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“…Of particular interest is the role of ion chemistry on the formation of heavy N-bearing molecules in ionospheric conditions [16]. The present article uses this model to show how dissociative recombination impacts molecular growth in these plasmas and to compare the predictions of our "FullDR" model with those of the corresponding "H-loss" model.…”

Section: Apsismentioning

confidence: 99%

Dissociative recombination exalts molecular growth in N₂/CH₄plasmas

Pernot

Peng²,

Plessis³

et al. 2015

EPJ Web of Conferences

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Abstract. We present a comparison of the outcomes of two models of N 2 /CH 4 VUV plasmas in two sets of conditions representative of a laboratory experiment and of Titan's ionosphere. The "FullDR" model incorporates all available experimental data on dissociative recombination od C x H y N + z ions thanks to the probabilistic tree technique recently developed in our group, whereas the "Hloss" model implements the H-loss pathways used by default in many models. We show that the FullDR model enhances globally the production of neutrals and ions, through the production of C 2 H x fragments. These species are efficient promoters of molecular growth, notably in the higher pressure conditions of the laboratory experiment.

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