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1. A PRECISE ASTEROSEISMIC AGE AND RADIUS FOR THE EVOLVED SUN-LIKE STAR KIC 11026764

Author

V. Silva Aguirre, Graham A. Verner, David G. Koch, J. Molenda-Zakowicz, O. L. Creevey, P. Eggenberger, William J. Chaplin, Daniel Huber, Savita Mathur, S. Frandsen, A.-M. Broomhall, T. S. Metcalfe, Tiago L. Campante, Stephen T. Fletcher, Michael Thompson, Antonio Frasca, Roger New, Alfio Bonanno, P.-O. Quirion, Rasmus Handberg, M. Di Mauro, I. N. Kitiashvili, D. Salabert, Jesper Schou, Timothy M. Brown, Timothy R. White, K. H. Sato, Timothy R. Bedding, S. Dreizler, Rafael A. García, Jørgen Christensen-Dalsgaard, Saskia Hekker, Juan Carlos Suárez, L. Esch, A. Moya, Hans Kjeldsen, Paul Wilson, J. P. Marques, Thierry Appourchaux, Clara Régulo, Yvonne Elsworth, Dennis Stello, G. Doğan, J. Ballot, Sarbani Basu, William J. Borucki, Jon M. Jenkins, R. L. Gilliland, Christoffer Karoff, Katia Biazzo, Alexander G. Kosovichev, S. G. Sousa, Ian W. Roxburgh, Ning Gai, M. Bazot, L. Piau, Mário J. P. F. G. Monteiro, H. Bruntt, Faculdade de Ciências, High Altitude Observatory, National Center for Atmospheric Research, Centro de Astrofísica, Universidade do Porto, University of Sheffield [Sheffield], Astronomical Institute, University of Wroclaw, Institut d'astrophysique spatiale (IAS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), School of Physics and Astronomy, University of Birmingham, Danish AsteroSeismology Centre (DASC), Observatoire Astronomique de l'Université de Genève, Sydney Institute for Astronomy (SIfA), Observatoire de Paris, Université Paris sciences et lettres (PSL), Instituto de Astrofísica de Canarias (IAC), Canadian Space Agency (CSA), INAF-Osservatorio Astrofisico di Catania (INAF-OACt), Max-Planck-Institut für Astrophysik (MPA), Department of Astronomy, Yale University, Istituto di Astrofisica Spaziale e Fisica Cosmica (IASF-Roma), HEPL, Stanford University, Stanford, Center for Turbulence Research, Stanford University, Instituto de Astrofisica de Andalucia, CSIC (IAA), Laboratorio de Astrofísica, CAB (CSIC-INTA), Villanueva de la Cañada, Madrid, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-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 Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), INAF-Osservatorio Astrofisico di Arcetri (INAF-OAA), Institut für Astrophysik, Universität Göttingen, Nordic Optical Telescope, Las Cumbres Observatory, Goleta, Space Telescope Science Institute (STScI), Materials Engineering Research Institute, Sheffield Hallam University, Sheffield, Astronomy Unit, Queen Mary, Laboratoire Astrophysique de Toulouse-Tarbes (LATT), 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), National Aeronautics and Space Administration, Ames Research Center, and SETI Institute, NASA Ames Research Center, Moffett Field

Subjects
Astronomia, Física, Física [Ciências exactas e naturais], FOS: Physical sciences, Astrophysics, Star (graph theory), 01 natural sciences, Physical sciences [Natural sciences], Planet, Astronomy, Physical sciences, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, Solar and Stellar Astrophysics (astro-ph.SR), Astrophysics::Galaxy Astrophysics, Physics, Earth and Planetary Astrophysics (astro-ph.EP), 010308 nuclear & particles physics, Oscillation, Subgiant, Astronomy and Astrophysics, Radius, Exoplanet, Stars, Photometry (astronomy), Astrophysics - Solar and Stellar Astrophysics, 13. Climate action, Space and Planetary Science, Astrophysics::Earth and Planetary Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - Earth and Planetary Astrophysics
Abstract

The primary science goal of the Kepler Mission is to provide a census of exoplanets in the solar neighborhood, including the identification and characterization of habitable Earth-like planets. The asteroseismic capabilities of the mission are being used to determine precise radii and ages for the target stars from their solar-like oscillations. Chaplin et al. (2010) published observations of three bright G-type stars, which were monitored during the first 33.5 days of science operations. One of these stars, the subgiant KIC 11026764, exhibits a characteristic pattern of oscillation frequencies suggesting that it has evolved significantly. We have derived asteroseismic estimates of the properties of KIC 11026764 from Kepler photometry combined with ground-based spectroscopic data. We present the results of detailed modeling for this star, employing a variety of independent codes and analyses that attempt to match the asteroseismic and spectroscopic constraints simultaneously. We determine both the radius and the age of KIC 11026764 with a precision near 1%, and an accuracy near 2% for the radius and 15% for the age. Continued observations of this star promise to reveal additional oscillation frequencies that will further improve the determination of its fundamental properties., Comment: 16 pages, 6 figures, 4 tables, ApJ in press

Published
2010

2. Fluorescence explorer (FLEX): An optimised payload to map vegetation photosynthesis from space

Author

Elizabeth M. Middleton, Dan Lobb, Yasunori Saito, Alexander Dudelzak, Jose Moreno, Andrew Court, Gregory P. Asner, Jaume Flexas, Massimo Menenti, Jean-Louis Roujean, Richard Fernandes, Michael E. Schaepman, Federico Magnani, Wout Verhoef, Jesus B. Serrano, Carsten Tobehn, Roberto Pedrós, Ray Merton, Jim Gower, Alfonso Martinez, Andries Rosema, Guido D'Urso, Albert Olioso, Javier Calpe, Mercedes Sierra, Roberto Colombo, Alfonso Calera, Antonio Palucci, Heike Bach, Z. Bob Su, Jan Polcher, Joachim Hill, Giovanna Cecchi, Edward J. Milton, Philip Lewis, Claus Buschmann, Robert O. Green, Ladislav Nedbal, Frank Veroustraete, Ismael Moya, Wolfgang Knorr, Pablo J. Zarco-Tejada, Uwe Rascher, Anatoly A. Gitelson, Gina H. Mohammed, Mathias Kneubühler, Li Jia, Antonio Plaza, Stéphane Jacquemoud, Stefania Pace, Pablo Martinez-Cobo, Michel M. Verstraete, Petya K. E. Campbell, Peter Gege, Tuomas Laurila, José A. Sobrino, Michal V. Marek, Andrew Bell, Rainer Reuter, Nicolas Tremblay, Piero Mazzinghi, Mathias Disney, J. J. Settle, Lawrence A. Corp, Stefan W. Maier, Tomás Belenguer, Jouni Peltoniemi, Marc Philippe Stoll, Eduardo de Miguel, Mike A. Cutter, Birgit Gielen, Bernard Saugier, Roland Valcke, Catherine Ottlé, Emanuel U. Gloor, Fermín Morales, Josep Peñuelas, John R. Miller, TNO Industrie en Techniek, Moreno, J. F., Asner, G. P., Bach, H., Belenguer, T., Bell, A., Buschmann, C., Calera, A., Calpe, J., Campbell, P., Cecchi, G., Colombo, R., Corp, L. A., Court, A., Cutter, M. A., Disney, M., Dudelzak, A., D'Urso, Guido, Fernandes, R., Flexas, J., Gege, P., Gielen, B., Gitelson, A., Gloor, E. U., Gower, J., Green, R. O., Hill, J., Jacquemoud, S., Jia, L., Kneubuhler, M., Laurila, T., Lewis, P., Lobb, D., Magnani, F., Maier, S. W., Marek, M. V., Martinez, A., Martinez Cobo, P., Mazzinghi, P., Menenti, M., Merton, R., Middleton, E., De Miguel, E., Miller, J., Mohammed, G., Milton, E. J., Morales, F., Moya, I., Nedbal, L., Knorr, W., Ottle, C., Olioso, A., Pace, S., Palucci, A., Pedros, R., Peltoniemi, J., Penuelas, J., Plaza, A., Polcher, J., Rascher, U., Reuter, R., Rosema, A., Roujean, J. L., Saito, Y., Saugier, B., Schaepman, M., Serrano, J. B., Settle, J. J., Sierra, M., Sobrino, J., Stoll, M. P., Bob Su, Z., Tobehn, C., Tremblay, N., Valcke, R., Verhoef, W., Veroustraete, F., Verstraete, M., Zarco Tejada, P., Department of Earth Physics and Thermodynamics [Valencia], Universitat de València (UV), Stanford University, VISTA GmbH, Laboratorio de Astrofísica, CAB (CSIC-INTA), Villanueva de la Cañada, Madrid, EMS Technologies Canada Ltd, Universität Karlsruhe (TH), Universidad de Castilla-La Mancha = University of Castilla-La Mancha (UCLM), NASA Goddard Space Flight Center (GSFC), Institute of Applied Physics 'Nello Carrara' (IFAC), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), Università degli Studi di Milano-Bicocca = University of Milano-Bicocca (UNIMIB), Hydrology and Remote Sensing Laboratory, USDA Agricultural Research Service [Beltsville, Maryland], USDA-ARS : Agricultural Research Service-USDA-ARS : Agricultural Research Service, TNO Science and Industry, The Netherlands Organisation for Applied Scientific Research (TNO), Sira Technology Ltd, University College of London [London] (UCL), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Institut de Physique du Globe de Paris (IPGP (UMR_7154)), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), York University [Toronto], Laboratoire pour l'utilisation du rayonnement électromagnétique (LURE), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-MENRT-Centre National de la Recherche Scientifique (CNRS), Environnement Méditerranéen et Modélisation des Agro-Hydrosystèmes (EMMAH), Avignon Université (AU)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Centre national de recherches météorologiques (CNRM), 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)-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 -Centre National de la Recherche Scientifique (CNRS), Ecologie Systématique et Evolution (ESE), AgroParisTech-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), National Aerospace Laboratory [Amsterdam] (NLR), National Aerospace, Flemish Institute for Technological Research (VITO), European Commission - Joint Research Centre [Ispra] (JRC), Faculty of Geo-Information Science and Earth Observation, UT-I-ITC-WCC, and Department of Water Resources

Subjects
Optimization, Earth observation, Atmospheric chemistry, Alterra - Centrum Geo-informatie, Fluorescence, remote sensing, Laboratory of Geo-information Science and Remote Sensing, Three-instrument array, FLEX, Life Science, Laboratorium voor Geo-informatiekunde en Remote Sensing, Wageningen Environmental Research, Photosynthesis, Space research, Water balance, Chlorophyll fluorescence, Remote sensing, Vegetation, Resilience, Payload, Chemistry, Centre Geo-information, PE&RC, Earth system science, FLuorescence EXplorer (FLEX), [SDE]Environmental Sciences, Earth (planet), Soils, Terrestrial vegetation, Satellite
Abstract

The FLuorescence EXplorer (FLEX) mission proposes to launch a satellite for the global monitoring of steady-state chlorophyll fluorescence in terrestrial vegetation. Fluorescence is a sensitive probe of photosynthetic function in both healthy and physiologically perturbed vegetation, and a powerful non-invasive tool to track the status, resilience, and recovery of photochemical processes and moreover provides important information on overall photosynthetic performance with implications for related carbon sequestration. The early responsiveness of fluorescence to atmospheric, soil and plant water balance, as well as to atmospheric chemistry and human intervention in land usage makes it an obvious biological indicator in improving our understanding of Earth system dynamics. The amenability of fluorescence to remote, even space-basedobservation qualifies it to join the emerging suite of space-based technologies for Earth observation. FLEX would encompass a three-instrument array for measurement of the interrelated features of fluorescence, hyperspectral reflectance, and canopy temperature. FLEX would involve a space and ground-truthing program of 3-years duration and would provide data formats for research and applied science.

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