TY - JOUR A1 - Rinaldi, G. A1 - Formisano, M. A1 - Kappel, David A1 - Capaccioni, F. A1 - Bockelee-Morvan, D. A1 - Cheng, Y-C A1 - Vincent, J-B A1 - Deshapriya, P. A1 - Arnold, G. A1 - Capria, M. T. A1 - Ciarniello, M. A1 - De Sanctis, M. C. A1 - Doose, L. A1 - Erard, S. A1 - Federico, C. A1 - Filacchione, G. A1 - Fink, U. A1 - Leyrat, C. A1 - Longobardo, A. A1 - Magni, G. A1 - Mighorini, A. A1 - Mottola, S. A1 - Naletto, G. A1 - Raponi, A. A1 - Taylor, F. A1 - Tosi, F. A1 - Tozzi, G. P. A1 - Salatti, M. T1 - Analysis of night-side dust activity on comet 67P observed by VIRTIS-M BT - a new method to constrain the thermal inertia on the surface JF - Astronomy and astrophysics : an international weekly journal N2 - On 2015 July 18, near perihelion at a heliocentric distance of 1.28 au, the Visible InfraRed Thermal Imaging Spectrometer (VIRTIS-M) on board the Rosetta spacecraft had the opportunity of observing dust activity in the inner coma with a view of the night side (shadowed side) of comet 67P/Churyumov-Gerasimenko. At the time of the measurements we present here, we observe a dust plume that originates on the far side of the nucleus. We are able to identify the approximate location of its source at the boundary between the Hapi and Anuket regions, and we find that it has been in darkness for some hours before the observation. Assuming that this time span is equal to the conductive time scale, we obtain a thermal inertia in the range 25-36 W K-1 m(-2) s(-1/2). These thermal inertia values can be used to verify with a 3D finite-element method (REM) numerical code whether the surface and subsurface temperatures agree with the values found in the literature. We explored three different configurations: (1) a layer of water ice mixed with dust beneath a dust mantle of 5 mm with thermal inertia of 36 J m(-2) K-1 S-0.5 ; (2) the same structure, but with thermal inertia of 100 J m(-2) K-1 S-0.5; (3) an ice-dust mixture that is directly exposed. Of these three configurations, the first seems to be the most reasonable, both for the low thermal inertia and for the agreement with the surface and subsurface temperatures that have been found for the comet 67P/Churyumov-Gerasimenko. The spectral properties of the plume show that the visible dust color ranged from 16 +/- 4.8%/100 nm to 13 +/- 2.6%/100 nm, indicating that this plume has no detectable color gradient. The morphology of the plume can be classified as a narrow jet that has an estimated total ejected mass of between 6 and 19 tons when we assume size distribution indices between -2.5 and -3. KW - comets: general KW - comets: individual: 67P/Churyumov-Gerasimenko KW - infrared: planetary systems Y1 - 2019 U6 - https://doi.org/10.1051/0004-6361/201834907 SN - 1432-0746 VL - 630 PB - EDP Sciences CY - Les Ulis ER - TY - JOUR A1 - Tosi, Federico A1 - Capaccioni, F. A1 - Capria, M. T. A1 - Mottola, Stefano A1 - Zinzi, A. A1 - Ciarniello, M. A1 - Filacchione, G. A1 - Hofstadter, M. A1 - Fonti, S. A1 - Formisano, M. A1 - Kappel, David A1 - Kührt, E. A1 - Leyrat, C. A1 - Vincent, J-B A1 - Arnold, G. A1 - De Sanctis, M. C. A1 - Longobardo, Andrea A1 - Palomba, E. A1 - Raponi, A. A1 - Rousseau, Batiste A1 - Schmitt, Bernard A1 - Barucci, Maria Antonietta A1 - Bellucci, Giancarlo A1 - Benkhoff, Johannes A1 - Bockelee-Morvan, D. A1 - Cerroni, P. A1 - Combe, J-Ph A1 - Despan, D. A1 - Erard, Stéphane A1 - Mancarella, F. A1 - McCord, T. B. A1 - Migliorini, Alessandra A1 - Orofino, V A1 - Piccioni, G. T1 - The changing temperature of the nucleus of comet 67P induced by morphological and seasonal effects JF - Nature astronomy N2 - Knowledge of the surface temperature distribution on a comet’s nucleus and its temporal evolution at different timescales is key to constraining its thermophysical properties and understanding the physical processes that take place at and below the surface. Here we report on time-resolved maps of comet 67P/Churyumov–Gerasimenko retrieved on the basis of infrared data acquired by the Visible InfraRed and Thermal Imaging Spectrometer (VIRTIS) onboard the Rosetta orbiter in 2014, over a roughly two-month period in the pre-perihelion phase at heliocentric distances between 3.62 and 3.31 au from the Sun. We find that at a spatial resolution ≤15 m per pixel, the measured temperatures point out the major effect that self-heating, due to the complex shape of the nucleus, has on the diurnal temperature variation. The bilobate nucleus of comet 67P also induces daytime shadowing effects, which result in large thermal gradients. Over longer periods, VIRTIS-derived temperature values reveal seasonal changes driven by decreasing heliocentric distance combined with an increasing abundance of ice within the uppermost centimetre-thick layer, which implies the possibility of having a largely pristine nucleus interior already in the shallow subsurface Y1 - 2019 U6 - https://doi.org/10.1038/s41550-019-0740-0 SN - 2397-3366 VL - 3 IS - 7 SP - 649 EP - 658 PB - Nature Publ. Group CY - London ER - TY - JOUR A1 - Weber, Michael A1 - Scholz, Denis A1 - Schröder-Ritzrau, Andrea A1 - Deininger, Michael A1 - Spötl, Christoph A1 - Lugli, Federico A1 - Mertz-Kraus, Regina A1 - Jochum, Klaus Peter A1 - Fohlmeister, Jens Bernd A1 - Stumpf, Cintia F. A1 - Riechelmann, Dana F. C. T1 - Evidence of warm and humid interstadials in central Europe during early MISSUE 3 revealed by a multi-proxy speleothem record JF - Quaternary science reviews : the international multidisciplinary research and review journal N2 - Marine Isotope Stage 3 (MIS 3, 57-27 ka) was characterised by numerous rapid climate oscillations (i.e., Dansgaard-Oeschger (D/O-) events), which are reflected in various climate archives. So far, MIS 3 speleothem records from central Europe have mainly been restricted to caves located beneath temperate Alpine glaciers or close to the Atlantic Ocean. Thus, MIS 3 seemed to be too cold and dry to enable speleothem growth north of the Alps in central Europe. Here we present a new speleothem record from Bunker Cave, Germany, which shows two distinct growth phases from 52.0 (+0.8, -0.5) to 50.9 (+0.6, -1.3) ka and 473 (+1.0, -0.6) to 42.8 (+/- 0.9) ka, rejecting this hypothesis. These two growth phases potentially correspond to the two warmest and most humid phases in central Europe during MIS 3, which is confirmed by pollen data from the nearby Eifel. The hiatus separating the two phases is associated with Heinrich stadial 5 (HS 5), although the growth stop precedes the onset of HS 5. The first growth phase is characterised by a fast growth rate, and Mg concentrations and Sr isotope data suggest high infiltration and the presence of soil cover above the cave. The second growth phase was characterised by drier, but still favourable conditions for speleothem growth. During this phase, the delta C-13 values show a significant decrease associated with D/O-event 12. The timing of this shift is in agreement with other MIS 3 speleothem data from Europe and Greenland ice core data. (C) 2018 Elsevier Ltd. All rights reserved. KW - Speleothems KW - Pleistocene KW - Palaeoclimatology KW - Europe KW - Dansgaard-Oeschger event KW - Marine isotope stage 3 KW - Bunker cave KW - Multi-proxy approach KW - U-Th series Y1 - 2018 U6 - https://doi.org/10.1016/j.quascirev.2018.09.045 SN - 0277-3791 VL - 200 SP - 276 EP - 286 PB - Elsevier CY - Oxford ER - TY - JOUR A1 - Rousseau, Batiste A1 - Erard, Stéphane A1 - Beck, P. A1 - Quirico, Eric A1 - Schmitt, B. A1 - Brissaud, O. A1 - Montes-Hernandez, G. A1 - Capaccioni, F. A1 - Filacchione, Gianrico A1 - Bockelee-Morvan, Dominique A1 - Leyrat, C. A1 - Ciarniello, M. A1 - Raponi, Andrea A1 - Kappel, David A1 - Arnold, G. A1 - Moroz, L. V. A1 - Palomba, Ernesto A1 - Tosi, Federico T1 - Laboratory simulations of the Vis-NIR spectra of comet 67P using sub-mu m sized cosmochemical analogues JF - Icarus : international journal of solar system studies N2 - Laboratory spectral measurements of relevant analogue materials were performed in the framework of the Rosetta mission in order to explain the surface spectral properties of comet 67P. Fine powders of coal, iron sulphides, silicates and their mixtures were prepared and their spectra measured in the Vis-IR range. These spectra are compared to a reference spectrum of 67P nucleus obtained with the VIRTIS/Rosetta instrument up to 2.7 mu m, excluding the organics band centred at 3.2 mu m. The species used are known to be chemical analogues for cometary materials which could be present at the surface of 67P. Grain sizes of the powders range from tens of nanometres to hundreds of micrometres. Some of the mixtures studied here actually reach the very low reflectance level observed by VIRTIS on 67P. The best match is provided by a mixture of sub-micron coal, pyrrhotite, and silicates. Grain sizes are in agreement with the sizes of the dust particles detected by the GIADA, MIDAS and COSIMA instruments on board Rosetta. The coal used in the experiment is responsible for the spectral slope in the visible and infrared ranges. Pyrrhotite, which is strongly absorbing, is responsible for the low albedo observed in the NIR. The darkest components dominate the spectra, especially within intimate mixtures. Depending on sample preparation, pyrrhotite can coat the coal and silicate aggregates. Such coating effects can affect the spectra as much as particle size. In contrast, silicates seem to play a minor role. (c) 2017 Elsevier Inc. All rights reserved. KW - Comets KW - Comets nucleus KW - Comets composition KW - Spectroscopy KW - Experimental techniques Y1 - 2018 U6 - https://doi.org/10.1016/j.icarus.2017.10.015 SN - 0019-1035 SN - 1090-2643 VL - 306 SP - 306 EP - 318 PB - Elsevier CY - San Diego ER - TY - JOUR A1 - Khudair, Mohammed A1 - Marcuzzi, Anna A1 - Ng, Kwok A1 - Tempest, Gavin Daniel A1 - Bartoš, František A1 - Peric, Ratko A1 - Maier, Maximilian A1 - Beccia, Flavia A1 - Boccia, Stefania A1 - Brandes, Mirko A1 - Cardon, Greet A1 - Carlin, Angela A1 - Castagna, Carolina A1 - Chaabene, Helmi A1 - Chalkley, Anna A1 - Ciaccioni, Simone A1 - Cieślińska-Świder, Joanna A1 - Čingienė, Vilma A1 - Cortis, Cristina A1 - Corvino, Chiara A1 - de Geus, Eco J. C. A1 - Di Baldassarre, Angela A1 - Di Credico, Andrea A1 - Drid, Patrik A1 - Tarazaga, Rosa Ma Fernández A1 - Gallè, Francesca A1 - Sánchez, Esther Garcia A1 - Gebremariam, Mekdes A1 - Ghinassi, Barbara A1 - Goudas, Marios A1 - Hayes, Grainne A1 - Honorio, Samuel A1 - Izzicupo, Pascal A1 - Jahre, Henriette A1 - Jelsma, Judith A1 - Juric, Petra A1 - Kolovelonis, Athanasios A1 - Kongsvold, Atle A1 - Kouidi, Evangelia A1 - Mansergh, Fiona A1 - Masanovic, Bojan A1 - Mekonnen, Teferi A1 - Mork, Paul Jarle A1 - Murphy, Marie A1 - O'Hara, Kelly A1 - Torun, Ayse Ozbil A1 - Palumbo, Federico A1 - Popovic, Stevo A1 - Prieske, Olaf A1 - Puharic, Zrinka A1 - Ribeiro, José Carlos A1 - Rumbold, Penny Louise Sheena A1 - Sandu, Petru A1 - Soric, Maroje A1 - Stavnsbo, Mette A1 - Syrmpas, Ioannis A1 - van der Ploeg, Hidde P. A1 - Van Hoye, Aurélie A1 - Vilela, Sofia A1 - Woods, Catherine A1 - Wunsch, Kathrin A1 - Caprinica, Laura A1 - MacDonncha, Ciaran A1 - Ling, Fiona Chun Man T1 - DE-PASS Best Evidence Statement (BESt): modifiable determinants of physical activity and sedentary behaviour in children and adolescents aged 5-19 years-a protocol for systematic review and meta-analysis JF - BMJ open N2 - Introduction Physical activity among children and adolescents remains insufficient, despite the substantial efforts made by researchers and policymakers. Identifying and furthering our understanding of potential modifiable determinants of physical activity behaviour (PAB) and sedentary behaviour (SB) is crucial for the development of interventions that promote a shift from SB to PAB. The current protocol details the process through which a series of systematic literature reviews and meta-analyses (MAs) will be conducted to produce a best-evidence statement (BESt) and inform policymakers. The overall aim is to identify modifiable determinants that are associated with changes in PAB and SB in children and adolescents (aged 5-19 years) and to quantify their effect on, or association with, PAB/SB. Methods and analysis A search will be performed in MEDLINE, SportDiscus, Web of Science, PsychINFO and Cochrane Central Register of Controlled Trials. Randomised controlled trials (RCTs) and controlled trials (CTs) that investigate the effect of interventions on PAB/SB and longitudinal studies that investigate the associations between modifiable determinants and PAB/SB at multiple time points will be sought. Risk of bias assessments will be performed using adapted versions of Cochrane's RoB V.2.0 and ROBINS-I tools for RCTs and CTs, respectively, and an adapted version of the National Institute of Health's tool for longitudinal studies. Data will be synthesised narratively and, where possible, MAs will be performed using frequentist and Bayesian statistics. Modifiable determinants will be discussed considering the settings in which they were investigated and the PAB/SB measurement methods used. Ethics and dissemination No ethical approval is needed as no primary data will be collected. The findings will be disseminated in peer-reviewed publications and academic conferences where possible. The BESt will also be shared with policy makers within the DE-PASS consortium in the first instance. Systematic review registration CRD42021282874. KW - public health KW - health policy KW - community child health Y1 - 2022 U6 - https://doi.org/10.1136/bmjopen-2021-059202 SN - 2044-6055 VL - 12 IS - 9 PB - BMJ Publishing Group CY - London ER -