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359 results on '"Hainaut, O."'

52. Charon's size and an upper limit on its atmosphere from a stellar occultation

Author

Sicardy, B., Bellucci, A., Gendron, E., Lacombe, F., Lacour, S., Lecacheux, J., Lellouch, E., Renner, S., Pau, S., Roques, F., Widemann, T., Colas, F., Vachier, F., Vieira Martins, R., Ageorges, N., Hainaut, O., Marco, O., Beisker, W., Hummel, E., Feinstein, C., Levato, H., Maury, A., Frappa, E., Gaillard, B., Lavayssière, M., Di Sora, M., Mallia, F., Masi, G., Behrend, R., Carrier, F., Mousis, O., Rousselot, P., Alvarez-Candal, A., Lazzaro, D., Veiga, C., Andrei, A. H., Assafin, M., da Silva Neto, D. N., Jacques, C., Pimentel, E., Weaver, D., Lecampion, J.-F., Doncel, F., Momiyama, T., and Tancredi, G.

Published
2006

54. Large changes in Plutoʼs atmosphere as revealed by recent stellar occultations

Author

Sicardy, B., Widemann, T., Lellouch, E., Veillet, C., Cuillandre, J.-C., Colas, F., Roques, F., Beisker, W., Kretlow, M., Lagrange, A.-M., Gendron, E., Lacombe, F., Lecacheux, J., Birnbaum, C., Fienga, A., Leyrat, C., Maury, A., Raynaud, E., Renner, S., Schultheis, M., Brooks, K., Delsanti, A., Hainaut, O. R., Gilmozzi, R., Lidman, C., Spyromilio, J., Rapaport, M., Rosenzweig, P., Naranjo, O., Porras, L., Díaz, F., Calderón, H., Carrillo, S., Carvajal, A., Recalde, E., Cavero, Gaviria L., Montalvo, C., Barría, D., Campos, R., Duffard, R., and Levato, H.

Published
2003

56. Observations of the volcanoes of Io, Loki and Pele, made in 1991 at the ESO during occultation by Europa

Author

Descamps, P., Arlot, J.E., Thuillot, W., Colas, F., Vu, D.T., Bouchet, P., and Hainaut, O.

Subjects
Io (Satellite) -- Observations, Occultations -- Observations, Astronomy, Earth sciences
Abstract

Mutual eclipses and occultations between the Galilean satellites were observed and investigated. Two volcanoes with 3.8 micrometer signatures were occulted. A model was used to analyze the infrared lightcurve to determine the temperature and size of the major known volcano on Io and Loki. The results showed that Pele has undergone a significant decrease in thermal emission.

Published
1992

58. An Unusual Supernova in the Error Box of the Gamma-Ray Burst of 25 April 1998

Author

Galama , T. J, Vreeswijk, P. M, vanParadijs, J, Kouveliotou, C, Augusteijn, T, Boehnhardt, H, Brewer, J. P, Doublier, V, Gonzalez, J.-F, Leibundgut, B, Lidman, C, Hainaut, O. R, Patat, F, Heise, J, intZand, J, Hurley, K, Groot, P. J, Strom, R. G, Mazzali, P. A, and Iwamoto, K

Subjects
Astronomy
Abstract

The discovery of afterglows associated with gamma-ray bursts at X-ray, optical and radio wavelengths and the measurement of the redshifts of some of these events has established that gamma-ray bursts lie at extreme distances, making them the most powerful photon-emitters known in the Universe. Here we report the discovery of transient optical emission in the error box of the gamma-ray burst GRB980425, the light curve of which was very different from that of previous optical afterglows associated with gamma-ray bursts. The optical transient is located in a spiral arm of the galaxy ESO 184-GS2, which has a redshift velocity of only 2,550 km/ s. Its optical spectrum and location indicate that it is a very luminous supernova, which has been identified as SN1998bw. If this supernova and GRB980425 are indeed associated, the energy radiated in gamma-rays is at least four orders of magnitude less than in other gamma-ray bursts, although its appearance was otherwise unremarkable: this indicates that very different mechanisms can give rise to gamma-ray bursts. But independent of this association, the supernova is itself unusual, exhibiting an unusual light curve at radio wavelengths that requires that the gas emitting the radio photons be expanding relativistically.

Published
1999

59. A hypernova model for the supernova associated with the gamma-ray burst of 25 April 1998

Author

Iwamoto, K., Mazzali, P. A., Nomoto, K., Umeda, H., Nakamura, T., Patat, F., Danziger, I. J., Young, T. R., Suzuki, T., Shigeyama, T., Augusteijn, T., Doublier, V., Gonzalez, J.-F., Boehnhardt, H., Brewer, J., Hainaut, O. R., Lidman, C., Leibundgut, B., Cappellaro, E., Turatto, M., Galama, T. J., Vreeswijk, P. M., Kouveliotou, C., van Paradijs, J., Pian, E., Palazzi, E., and Frontera, F.

Published
1998

60. An unusual supernova in the error box of the gamma-ray burst of 25 April 1998

Author

Galama, T. J., Vreeswijk, P. M., van Paradijs, J., Kouveliotou, C., Augusteijn, T., Bohnhardt, H., Brewer, J. P., Doublier, V., Gonzalez, J.-F., Leibundgut, B., Lidman, C., Hainaut, O. R., Patat, F., Heise, J., 't Zand, J., Hurley, K., Groot, P. J., Strom, R. G., Mazzali, P. A., Iwamoto, K., Nomoto, K., Umeda, H., Nakamura, T., Young, T. R., Suzuki, T., Shigeyama, T., Koshut, T., Kippen, M., Robinson, C., de Wildt, P., Wijers, R. A. M. J., Tanvir, N., Greiner, J., Pian, E., Palazzi, E., Frontera, F., Masetti, N., Nicastro, L., Feroci, M., Costa, E., Piro, L., Peterson, B. A., Tinney, C., Boyle, B., Cannon, R., Stathakis, R., Sadler, E., Begam, M. C., and Ianna, P.

Published
1998

62. The Castalia mission to Main Belt Comet 133P/Elst-Pizarro

Author

Science and Technology Facilities Council (UK), European Southern Observatory, Snodgrass, C., Jones, G. H., Boehnhardt, H., Gibbings, A., Homeister, M., Andre, N., Beck, P., Bentley, M. S., Bertini, I., Bowles, Neil, Capria, M. T., Carr, C., Ceriotti, M., Coates, A. J., Della Corte, V., Donaldson Hanna, K. L., Fitzsimmons, A., Gutiérrez, Pedro J., Hainaut, O. R., Herique, A., Hilchenbach, M., Hsieh, H. H., Jehin, E., Karatekin, O., Kofman, W., Lara, Luisa María, Laudan, K., Licandro, J., Lowry, S. C., Marzari, F., Masters, A., Meech, K. J., Moreno, Fernando, Morse, A., Orosei, R., Pack, A., Plettemeier, D., Prialnik, D., Rotundi, A., Rubin, M., Sánchez, J. P., Sheridan, S., Trieloff, M., Winterboer, A., Science and Technology Facilities Council (UK), European Southern Observatory, Snodgrass, C., Jones, G. H., Boehnhardt, H., Gibbings, A., Homeister, M., Andre, N., Beck, P., Bentley, M. S., Bertini, I., Bowles, Neil, Capria, M. T., Carr, C., Ceriotti, M., Coates, A. J., Della Corte, V., Donaldson Hanna, K. L., Fitzsimmons, A., Gutiérrez, Pedro J., Hainaut, O. R., Herique, A., Hilchenbach, M., Hsieh, H. H., Jehin, E., Karatekin, O., Kofman, W., Lara, Luisa María, Laudan, K., Licandro, J., Lowry, S. C., Marzari, F., Masters, A., Meech, K. J., Moreno, Fernando, Morse, A., Orosei, R., Pack, A., Plettemeier, D., Prialnik, D., Rotundi, A., Rubin, M., Sánchez, J. P., Sheridan, S., Trieloff, M., and Winterboer, A.

Abstract

We describe Castalia, a proposed mission to rendezvous with a Main Belt Comet (MBC), 133P/Elst-Pizarro. MBCs are a recently discovered population of apparently icy bodies within the main asteroid belt between Mars and Jupiter, which may represent the remnants of the population which supplied the early Earth with water. Castalia will perform the first exploration of this population by characterising 133P in detail, solving the puzzle of the MBC's activity, and making the first in situ measurements of water in the asteroid belt. In many ways a successor to ESA's highly successful Rosetta mission, Castalia will allow direct comparison between very different classes of comet, including measuring critical isotope ratios, plasma and dust properties. It will also feature the first radar system to visit a minor body, mapping the ice in the interior. Castalia was proposed, in slightly different versions, to the ESA M4 and M5 calls within the Cosmic Vision programme. We describe the science motivation for the mission, the measurements required to achieve the scientific goals, and the proposed instrument payload and spacecraft to achieve these. © 2017 COSPAR

Published
2018

63. High-resolution imaging of the Pluto-Charon system with the Faint Object Camera of the Hubble Space Telescope

Author

Albrecht, R, Barbieri, C, Adorf, H.-M, Corrain, G, Gemmo, A, Greenfield, P, Hainaut, O, Hook, R. N, Tholen, D. J, and Blades, J. C

Subjects
Astronomy
Abstract

Images of the Pluto-Charon system were obtained with the Faint Object Camera (FOC) of the Hubble Space Telescope (HST) after the refurbishment of the telescope. The images are of superb quality, allowing the determination of radii, fluxes, and albedos. Attempts were made to improve the resolution of the already diffraction limited images by image restoration. These yielded indications of surface albedo distributions qualitatively consistent with models derived from observations of Pluto-Charon mutual eclipses.

Published
1994
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64. Major outburst of periodic Comet Halley at a heliocentric distance of 14 AU

Author

Sekanina, Z, Larson, S. M, Hainaut, O, Smette, A, and West, R. M

Subjects
Astrophysics
Abstract

The properties and evolution of the major outburst experienced by Comet Halley at 14 AU during February-March 1991 are studied. It is found that the observed halo is a segment of a conical surface populated by solid particles ejected from a localized, temporarily activated region on the sunlit hemisphere of the spinning nucleus. The total mass of the ejecta was at least 10 exp 12 g and CO was probably the prime driver, accelerating the smallest grains to a terminal velocity of about 45 m/s. The mass loading of the gas flow by particulate matter is enormous, with the mass production rate exceeding the expected production rate of CO by a factor of several tens.

Published
1992

68. The 67P/Churyumov–Gerasimenko observation campaign in support of the Rosetta mission

Author

Snodgrass, C., primary, A'Hearn, M. F., additional, Aceituno, F., additional, Afanasiev, V., additional, Bagnulo, S., additional, Bauer, J., additional, Bergond, G., additional, Besse, S., additional, Biver, N., additional, Bodewits, D., additional, Boehnhardt, H., additional, Bonev, B. P., additional, Borisov, G., additional, Carry, B., additional, Casanova, V., additional, Cochran, A., additional, Conn, B. C., additional, Davidsson, B., additional, Davies, J. K., additional, de León, J., additional, de Mooij, E., additional, de Val-Borro, M., additional, Delacruz, M., additional, DiSanti, M. A., additional, Drew, J. E., additional, Duffard, R., additional, Edberg, N. J. T., additional, Faggi, S., additional, Feaga, L., additional, Fitzsimmons, A., additional, Fujiwara, H., additional, Gibb, E. L., additional, Gillon, M., additional, Green, S. F., additional, Guijarro, A., additional, Guilbert-Lepoutre, A., additional, Gutiérrez, P. J., additional, Hadamcik, E., additional, Hainaut, O., additional, Haque, S., additional, Hedrosa, R., additional, Hines, D., additional, Hopp, U., additional, Hoyo, F., additional, Hutsemékers, D., additional, Hyland, M., additional, Ivanova, O., additional, Jehin, E., additional, Jones, G. H., additional, Keane, J. V., additional, Kelley, M. S. P., additional, Kiselev, N., additional, Kleyna, J., additional, Kluge, M., additional, Knight, M. M., additional, Kokotanekova, R., additional, Koschny, D., additional, Kramer, E. A., additional, López-Moreno, J. J., additional, Lacerda, P., additional, Lara, L. M., additional, Lasue, J., additional, Lehto, H. J., additional, Levasseur-Regourd, A. C., additional, Licandro, J., additional, Lin, Z. Y., additional, Lister, T., additional, Lowry, S. C., additional, Mainzer, A., additional, Manfroid, J., additional, Marchant, J., additional, McKay, A. J., additional, McNeill, A., additional, Meech, K. J., additional, Micheli, M., additional, Mohammed, I., additional, Monguió, M., additional, Moreno, F., additional, Muñoz, O., additional, Mumma, M. J., additional, Nikolov, P., additional, Opitom, C., additional, Ortiz, J. L., additional, Paganini, L., additional, Pajuelo, M., additional, Pozuelos, F. J., additional, Protopapa, S., additional, Pursimo, T., additional, Rajkumar, B., additional, Ramanjooloo, Y., additional, Ramos, E., additional, Ries, C., additional, Riffeser, A., additional, Rosenbush, V., additional, Rousselot, P., additional, Ryan, E. L., additional, Santos-Sanz, P., additional, Schleicher, D. G., additional, Schmidt, M., additional, Schulz, R., additional, Sen, A. K., additional, Somero, A., additional, Sota, A., additional, Stinson, A., additional, Sunshine, J. M., additional, Thompson, A., additional, Tozzi, G. P., additional, Tubiana, C., additional, Villanueva, G. L., additional, Wang, X., additional, Wooden, D. H., additional, Yagi, M., additional, Yang, B., additional, Zaprudin, B., additional, and Zegmott, T. J., additional

Published
2017
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69. CASTALIA : A mission to a main belt comet

Author

Jones, G. H., Altwegg, K., Bertini, I., Bieler, A., Boehnhardt, H., Bowles, N., Braukhane, A., Capria, M., T., Coates, A. J., Ciarletti, Valérie, Davidsson, B., Engrand, Cécile, Fitzsimmons, A., Gibbings, A., Hainaut, O., Hallmann, M., Herique, Alain, Hilchenbach, M., Homeister, M., Hsieh, H., Jehin, E., Kofman, W., Lara, L. M., Licandro, J., Lowry, S.C., Moreno, F., Muinonen, Karri, Paetzold, M., Penttilä, Antti, Plettmeier, Dirk, Prialnik, D., Marboeuf, U., Marzari, F., Meech, Karen J., Rotundi, A., Smith, A., Snodgrass, C., Thomas, I., Trieloff, M., Mullard Space Science Laboratory (MSSL), University College of London [London] (UCL), Physikalisches Institut [Bern], Universität Bern [Bern], Centro di Ateneo di Studi e Attività Spaziali 'Giuseppe Colombo' (CISAS), Universita degli Studi di Padova, Department of Atmospheric, Oceanic, and Space Sciences [Ann Arbor] (AOSS), University of Michigan [Ann Arbor], University of Michigan System-University of Michigan System, Max-Planck-Institut für Sonnensystemforschung (MPS), Max-Planck-Gesellschaft, Department of Atmospheric, Oceanic and Planetary Physics [Oxford] (AOPP), University of Oxford [Oxford], DLR Institute of Space Systems, German Aerospace Center (DLR), Istituto di Astrofisica e Planetologia Spaziali - INAF (IAPS), Istituto Nazionale di Astrofisica (INAF), PLANETO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Department of Physics and Astronomy [Uppsala], Uppsala University, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Astrophysics Research Centre [Belfast] (ARC), Queen's University [Belfast] (QUB), Department of Mechanical and Aerospace Engineering [Univ Strathclyde], University of Strathclyde [Glasgow], European Southern Observatory (ESO), Institut de Planétologie et d'Astrophysique de Grenoble (IPAG ), Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), OHB Systems AG, Institute for Astronomy [Honolulu], University of Hawai‘i [Mānoa] (UHM), Academia Sinica Institute of Astronomy and Astrophysics (ASIAA), Academia Sinica, Institut d'Astrophysique et de Géophysique [Liège], Université de Liège, Instituto de Astrofísica de Andalucía (IAA), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Instituto de Astrofisica de Canarias (IAC), Centre for Astrophysics and Planetary Science [Canterbury] (CAPS), University of Kent [Canterbury], Department of Physics [Helsinki], Falculty of Science [Helsinki], University of Helsinki-University of Helsinki, Universität zu Köln, Helsinki Institute of Physics (HIP), University of Helsinki, Technische Universität Dresden = Dresden University of Technology (TU Dresden), Tel Aviv University [Tel Aviv], Istituto Nazionale di Fisica Nucleare, Sezione di Padova (INFN, Sezione di Padova), Istituto Nazionale di Fisica Nucleare (INFN), Universita degli studi di Napoli 'Parthenope' [Napoli], The Open University [Milton Keynes] (OU), Universität Heidelberg [Heidelberg], IMPEC - LATMOS, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Department of Mechanical and Aerospace Engineering [Glasgow], University of Strathclyde, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), Centre National d'Études Spatiales [Toulouse] (CNES)-Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Consejo Superior de Investigaciones Científicas [Spain] (CSIC), Technische Universität Dresden (TUD), National Institute for Nuclear Physics (INFN), Cardon, Catherine, Universität Bern [Bern] (UNIBE), Università degli Studi di Padova = University of Padua (Unipd), Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research (MPS), University of Oxford, Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Orbitale Hochtechnologie Bremen (OHB Systems AG), Helsingin yliopisto = Helsingfors universitet = University of Helsinki-Helsingin yliopisto = Helsingfors universitet = University of Helsinki, Universität zu Köln = University of Cologne, Helsingin yliopisto = Helsingfors universitet = University of Helsinki, Tel Aviv University (TAU), Università degli Studi di Napoli 'Parthenope' = University of Naples (PARTHENOPE), Universität Heidelberg [Heidelberg] = Heidelberg University, Mullard Space Science Laboratory ( MSSL ), University College of London [London] ( UCL ), Centro di Ateneo di Studi e Attività Spaziali 'Giuseppe Colombo' ( CISAS ), Universita degli Studi di Padova = University of Padua = Université de Padoue, Department of Atmospheric, Oceanic, and Space Sciences [Ann Arbor] ( AOSS ), Max-Planck-Institut für Sonnensystemforschung ( MPS ), Department of Atmospheric, Oceanic and Planetary Physics [Oxford] ( AOPP ), German Aerospace Center ( DLR ), Istituto di Astrofisica e Planetologia Spaziali ( IAPS ), Istituto Nazionale di Astrofisica ( INAF ), Laboratoire Atmosphères, Milieux, Observations Spatiales ( LATMOS ), Université de Versailles Saint-Quentin-en-Yvelines ( UVSQ ) -Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Versailles Saint-Quentin-en-Yvelines ( UVSQ ) -Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS ), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse ( CSNSM ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Astrophysics Research Centre [Belfast] ( ARC ), Queen's University [Belfast] ( QUB ), European Southern Observatory ( ESO ), Institut de Planétologie et d'Astrophysique de Grenoble ( IPAG ), Observatoire des Sciences de l'Univers de Grenoble ( OSUG ), Université Joseph Fourier - Grenoble 1 ( UJF ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Grenoble Alpes ( UGA ) -Université Joseph Fourier - Grenoble 1 ( UJF ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Grenoble Alpes ( UGA ) -Centre National de la Recherche Scientifique ( CNRS ), University of Hawaii at Manoa ( UHM ), Institute of Astronomy and Astrophysics [Taipei] ( ASIAA ), Instituto de Astrofísica de Andalucía ( IAA ), Consejo Superior de Investigaciones Científicas [Spain] ( CSIC ), Instituto de Astrofisica de Canarias ( IAC ), Centre for Astrophysics and Planetary Science [Canterbury] ( CAPS ), University of Helsinki [Helsinki], Helsinki Institute of Physics ( HIP ), Technische Universität Dresden ( TUD ), Istituto Nazionale di Fisica Nucleare, Sezione di Padova ( INFN, Sezione di Padova ), National Institute for Nuclear Physics ( INFN ), and The Open University [Milton Keynes] ( OU )

Subjects
[SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [SDU.ASTR.EP] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [ SDU.ASTR.EP ] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP]
Abstract

International audience; Main Belt Comets (MBCs), a type of Active Asteroid , constitute a newly identified class of solar system objects. They have stable, asteroid-like orbits and some exhibit a recurrent comet-like appearance. It is believed that they survived the age of the solar system in a dormant state and that their current ice sublimation driven activity only began recently. Buried water ice is the only volatile expected to survive under an insulating surface. Excavation by an impact can expose the ice and trigger the start of MBC activity. We present the case for a mission to one of these objects, to be submitted to the European Space Agency's current call for an M-class mission. The specific science goals of the Castalia mission are: 1. Characterize a new Solar System family, the MBCs, by in-situ investigation 2. Understand the physics of activity on MBCs 3. Directly sample water in the asteroid belt and test if MBCs are a viable source for Earth's water 4. Use the observed structure of an MBC as a tracer of planetary system formation and evolution.

Published
2015

70. Distant activity of 67P/Churyumov-Gerasimenko in 2014: Ground-based results during the Rosetta pre-landing phase

Author

Snodgrass, C., Jehin, E., Manfroid, J., Opitom, C., Fitzsimmons, A., Tozzi, G. P., Faggi, S., Yang, B., Knight, M. M., Conn, B. C., Lister, T., Hainaut, O., Bramich, D. M., Lowry, S. C., Rożek, A., Tubiana, C., Guilbert-Lepoutre, A., Snodgrass, C., Jehin, E., Manfroid, J., Opitom, C., Fitzsimmons, A., Tozzi, G. P., Faggi, S., Yang, B., Knight, M. M., Conn, B. C., Lister, T., Hainaut, O., Bramich, D. M., Lowry, S. C., Rożek, A., Tubiana, C., and Guilbert-Lepoutre, A.

Abstract

Context. As the ESA Rosetta mission approached, orbited, and sent a lander to comet 67P/Churyumov-Gerasimenko in 2014, a large campaign of ground-based observations also followed the comet. Aims. We constrain the total activity level of the comet by photometry and spectroscopy to place Rosetta results in context and to understand the large-scale structure of the comet's coma pre-perihelion. Methods. We performed observations using a number of telescopes, but concentrate on results from the 8 m VLT and Gemini South telescopes in Chile. We use R-band imaging to measure the dust coma contribution to the comet's brightness and UV-visible spectroscopy to search for gas emissions, primarily using VLT/FORS. In addition we imaged the comet in near-infrared wavelengths (JHK) in late 2014 with Gemini-S/Flamingos-2. Results. We find that the comet was already active in early 2014 at heliocentric distances beyond 4 au. The evolution of the total activity (measured by dust) followed previous predictions. No gas emissions were detected despite sensitive searches. Conclusions. The comet maintains a similar level of activity from orbit to orbit, and is in that sense predictable, meaning that Rosetta results correspond to typical behaviour for this comet. The gas production (for CN at least) is highly asymmetric with respect to perihelion, as our upper limits are below the measured production rates for similar distances post-perihelion in previous orbits. © ESO, 2016.

Published
2016

71. Visible and near-IR observations of transneptunian objects

Author

Boehnhardt, H., Tozzi, G. P., Birkle, K., Hainaut, O., Sekiguchi, T., Vair, M., Watanabe, J., Rupprecht, G., and The FORS Instrument Team

Subjects
Absolute magnitude, Physics, education.field_of_study, Brightness, 010308 nuclear & particles physics, Population, Astronomy, Astronomy and Astrophysics, Astrophysics, Centaur, 01 natural sciences, Photometry (optics), Space and Planetary Science, Observatory, transneptunian objects, cubewanos, plutinos, scattered disk objects, Centaurs, photometry, spectroscopy, 0103 physical sciences, Magnitude (astronomy), Spectroscopy, education, 010303 astronomy & astrophysics
Abstract

We present visible (BVRI) and near-IR ( $JHK_{\rm s}$) broadband photometry and visible low-dispersion spectroscopy of Transneptunian Objects (TNOs) and Centaurs. In total, 16 TNOs and 1 Centaur were observed over the past two years at ESO telescopes in La Silla and Paranal in Chile as well as at the Calar Alto Observatory in Spain. The sample consists of objects measured for the first time and those for which comparison data is available from literature. The targets were: 1992QB1, 1993RO, 1994EV3, 1995HM5, 1995SM55, 1996RQ20, 1996TL66, 1996TO66, 1996TP66, 1997CQ29, 1997CS29, 1998HK151, 1998TF35, 1998VG44, 1998WH24, 1998XY95, 1999TC36. The spectra of 5 TNOs (1995SM55, 1996TO66, 1997CQ29, 1997CS29, 1998HK151) show almost constant gradients over the visible wavelength range with only marginal indication for a flatter slope beyond 750-800 nm. The photometric colour gradients obtained quasi-simultaneously are in good agreement with the spectral data. This suggests that in general photometric colour gradients are a valuable diagnostic tool for spectral type classification of TNOs. The photometric study revealed a number of new objects with neutral and red colours. For re-measured objects the published broadband colours were -in general -confirmed, although a few remarkable exceptions exist. Two TNOs appear to be outlyers according to the available broadband colours: 1993EV3 and 1995HM5. 1995SM55 is the bluest TNO measured so far. No clear global correlation between V-I colour and absolute R filter brightness of our TNO targets is found. However, the data for the 5 brightest TNOs (brighter than 5 mag absolute magnitude) could also be interpreted with a linear increase of V-I colour by about 0.75 mag per brightness magnitude. The colour-colour diagrams show continuous reddening of the TNOs in V-R vs. B-V, R-I vs. B-V and R-I vs. V-R. The bimodality suggested from earlier measurements of Tegler & Romanishin (1998) is not confirmed. According to our colour gradient statistics (number of objects per gradient interval) most of the TNOs have surface reddening between 0 and 40% /100 nm. For the Cubewanos the major population falls between 20-40% /100 nm. The Plutinos and Centaurs show a bifold grouping, i.e. a neutral/slightly reddish group (reddening

Published
2001
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73. The dust environment of comet 67P/Churyumov-Gerasimenko from Rosetta OSIRIS and VLT observations in the 4.5 to 2.9 AU heliocentric distance range inbound

Author

Moreno, F., primary, Snodgrass, C., additional, Hainaut, O., additional, Tubiana, C., additional, Sierks, H., additional, Barbieri, C., additional, Lamy, P. L., additional, Rodrigo, R., additional, Koschny, D., additional, Rickman, H., additional, Keller, H. U., additional, Agarwal, J., additional, A’Hearn, M. F., additional, Barucci, M. A., additional, Bertaux, J.-L., additional, Bertini, I., additional, Besse, S., additional, Bodewits, D., additional, Cremonese, G., additional, Da Deppo, V., additional, Davidsson, B., additional, Debei, S., additional, De Cecco, M., additional, Ferri, F., additional, Fornasier, S., additional, Fulle, M., additional, Groussin, O., additional, Gutiérrez, P. J., additional, Gutiérrez-Marques, P., additional, Güttler, C., additional, Hviid, S. F., additional, Ip, W.-H., additional, Jorda, L., additional, Knollenberg, J., additional, Kovacs, G., additional, Kramm, J.-R., additional, Kührt, E., additional, Küppers, M., additional, Lara, L. M., additional, Lazzarin, M., additional, López-Moreno, J. J., additional, Marzari, F., additional, Mottola, S., additional, Naletto, G., additional, Oklay, N., additional, Pajola, M., additional, Thomas, N., additional, Vincent, J. B., additional, Della Corte, V., additional, Fitzsimmons, A., additional, Faggi, S., additional, Jehin, E., additional, Opitom, C., additional, and Tozzi, G.-P., additional

Published
2016
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74. EChO

Author

Tinetti, G, Beaulieu, JP, Henning, T, Meyer, M, Micela, G, Ribas, I, Stam, D, Swain, M, Krause, O, Ollivier, M, Pace, E, Swinyard, B, Aylward, A, van Boekel, R, Coradini, A, Encrenaz, T, Snellen, I, Zapatero-Osorio, MR, Bouwman, J, Cho, JY-K, du Foresto, VC, Guillot, T, Lopez-Morales, M, Mueller-Wodarg, I, Palle, E, Selsis, F, Sozzetti, A, Ade, PAR, Achilleos, N, Adriani, A, Agnor, CB, Afonso, C, Allende Prieto, C, Bakos, G, Barber, RJ, Barlow, M, Batista, V, Bernath, P, Bezard, B, Borde, P, Brown, LR, Cassan, A, Cavarroc, C, Ciaravella, A, Cockell, C, Coustenis, A, Danielski, C, Decin, L, De Kok, R, Demangeon, O, Deroo, P, Doel, P, Drossart, P, Fletcher, LN, Focardi, M, Forget, F, Fossey, S, Fouque, P, Frith, J, Galand, M, Gaulme, P, Gonzalez Hernandez, JI, Grasset, O, Grassi, D, Grenfell, JL, Griffin, MJ, Griffith, CA, Groezinger, U, Guedel, M, Guio, P, Hainaut, O, Hargreaves, R, Hauschildt, PH, Heng, K, Heyrovsky, D, Hueso, R, Irwin, P, Kaltenegger, L, Kervella, P, Kipping, D, Koskinen, TT, Kovacs, G, La Barbera, A, Lammer, H, Lellouch, E, Leto, G, Lopez Valverde, MA, Lopez-Puertas, M, Lovis, C, Maggio, A, Maillard, JP, Maldonado Prado, J, Marquette, JB, Martin-Torres, FJ, Maxted, P, Miller, S, Molinari, S, Montes, D, Moro-Martin, A, Moses, JI, Mousis, O, Nguyen Tuong, N, Nelson, R, Orton, GS, Pantin, E, Pascale, E, Pezzuto, S, Pinfield, D, Poretti, E, Prinja, R, Prisinzano, L, Rees, JM, Reiners, A, Samuel, B, Sanchez-Lavega, A, Sanz Forcada, J, Sasselov, D, Savini, G, Sicardy, B, Smith, A, Stixrude, L, Strazzulla, G, Tennyson, J, Tessenyi, M, Vasisht, G, Vinatier, S, Viti, S, Waldmann, I, White, GJ, Widemann, T, Wordsworth, R, Yelle, R, Yung, Y, and Yurchenko, SN

Subjects
Science & Technology, Exoplanets, EARTH-LIKE PLANETS, MU-M, Astronomy & Astrophysics, M-DWARFS, ATMOSPHERE, Space mission, EXOPLANET HD 209458B, 0201 Astronomical And Space Sciences, Physical Sciences, astro-ph.EP, UPSILON ANDROMEDAE B, TRANSMISSION SPECTRUM, PHASE CURVE, 189733B, TRANSITING EXTRASOLAR PLANET, Planetary atmospheres, astro-ph.IM
Published
2012

75. EChO

Author

Tinetti, G., Beaulieu, J. P., Henning, T., Meyer, M., Micela, G., Ribas, I., Stam, D., Swain, M., Krause, O., Ollivier, M., Pace, E., Swinyard, B., Aylward, A., van Boekel, R., Coradini, A., Encrenaz, T., Snellen, I., Zapatero-Osorio, M. R., Bouwman, J., Cho, J. Y-K., Coudé de Foresto, V., Guillot, T., Lopez-Morales, M., Mueller-Wodarg, I., Palle, E., Selsis, F., Sozzetti, A., Ade, P. A. R., Achilleos, N., Adriani, A., Agnor, C. B., Afonso, C., Prieto, C. Allende, Bakos, G., Barber, R. J., Barlow, M., Batista, V., Bernath, P., Bézard, B., Bordé, P., Brown, L. R., Cassan, A., Cavarroc, C., Ciaravella, A., Cockell, C., Coustenis, A., Danielski, C., Decin, L., Kok, R. De, Demangeon, O., Deroo, P., Doel, P., Drossart, P., Fletcher, L. N., Focardi, M., Forget, F., Fossey, S., Fouqué, P., Frith, J., Galand, M., Gaulme, P., Hernández, J. I. González, Grasset, O., Grassi, D., Grenfell, J. L., Griffin, M. J., Griffith, C. A., Grözinger, U., Guedel, M., Guio, P., Hainaut, O., Hargreaves, R., Hauschildt, P. H., Heng, Kevin, Heyrovsky, D., Hueso, R., Irwin, P., Kaltenegger, L., Kervella, P., Kipping, D., Koskinen, T. T., Kovács, G., La Barbera, A., Lammer, H., Lellouch, E., Leto, G., Lopez Morales, M., Lopez Valverde, M. A., Lopez-Puertas, M., Lovis, C., Maggio, A., Maillard, J. P., Maldonado Prado, J., Marquette, J. B., Martin-Torres, F. J., Maxted, P., Miller, S., Molinari, S., Montes, D., Moro-Martin, A., Moses, J. I., Mousis, O., Nguyen Tuong, N., Nelson, R., Orton, G. S., Pantin, E., Pascale, E., Pezzuto, S., Pinfield, D., Poretti, E., Prinja, R., Prisinzano, L., Rees, J. M., Reiners, A., Samuel, B., Sánchez-Lavega, A., Forcada, J. Sanz, Sasselov, D., Savini, G., Sicardy, B., Smith, A., Stixrude, L., Strazzulla, G., Tennyson, J., Tessenyi, M., Vasisht, G., Vinatier, S., Viti, S., Waldmann, I., White, G. J., Widemann, T., Wordsworth, R., Yelle, R., Yung, Y., and Yurchenko, S. N.

Subjects
530 Physics, 520 Astronomy, Astrophysics::Earth and Planetary Astrophysics
Abstract

A dedicated mission to investigate exoplanetary atmospheres represents a major milestone in our quest to understand our place in the universe by placing our Solar System in context and by addressing the suitability of planets for the presence of life. EChO—the Exoplanet Characterisation Observatory—is a mission concept specifically geared for this purpose. EChO will provide simultaneous, multi-wavelength spectroscopic observations on a stable platform that will allow very long exposures. The use of passive cooling, few moving parts and well established technology gives a low-risk and potentially long-lived mission. EChO will build on observations by Hubble, Spitzer and ground-based telescopes, which discovered the first molecules and atoms in exoplanetary atmospheres. However, EChO’s configuration and specifications are designed to study a number of systems in a consistent manner that will eliminate the ambiguities affecting prior observations. EChO will simultaneously observe a broad enough spectral region—from the visible to the mid-infrared—to constrain from one single spectrum the temperature structure of the atmosphere, the abundances of the major carbon and oxygen bearing species, the expected photochemically-produced species and magnetospheric signatures. The spectral range and resolution are tailored to separate bands belonging to up to 30 molecules and retrieve the composition and temperature structure of planetary atmospheres. The target list for EChO includes planets ranging from Jupiter-sized with equilibrium temperatures T eq up to 2,000 K, to those of a few Earth masses, with T eq \u223c 300 K. The list will include planets with no Solar System analog, such as the recently discovered planets GJ1214b, whose density lies between that of terrestrial and gaseous planets, or the rocky-iron planet 55 Cnc e, with day-side temperature close to 3,000 K. As the number of detected exoplanets is growing rapidly each year, and the mass and radius of those detected steadily decreases, the target list will be constantly adjusted to include the most interesting systems. We have baselined a dispersive spectrograph design covering continuously the 0.4–16 μm spectral range in 6 channels (1 in the visible, 5 in the InfraRed), which allows the spectral resolution to be adapted from several tens to several hundreds, depending on the target brightness. The instrument will be mounted behind a 1.5 m class telescope, passively cooled to 50 K, with the instrument structure and optics passively cooled to \u223c45 K. EChO will be placed in a grand halo orbit around L2. This orbit, in combination with an optimised thermal shield design, provides a highly stable thermal environment and a high degree of visibility of the sky to observe repeatedly several tens of targets over the year. Both the baseline and alternative designs have been evaluated and no critical items with Technology Readiness Level (TRL) less than 4–5 have been identified. We have also undertaken a first-order cost and development plan analysis and find that EChO is easily compatible with the ESA M-class mission framework.

Published
2012
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76. The European Photon Imaging Camera on XMM-Newton: The MOS Cameras

Author

Turner, M., Abbey, A., Arnaud, M., Balasini, M., Belsole, E., Bennie, P., Bernard, J., Bignami, G., Boer, M., Briel, U., Butler, I., Cara, C., Chabaud, C., Cole, R., Collura, A., Conte, M., Cros, A., Denby, M., Dhez, P., Di Coco, G., Dowson, J., Ferrando, P., Ghizzardi, S., Gianotti, F., Goodall, C., Gretton, L., Griffiths, R., Hainaut, O., Hochedez, J., Holland, A., Jourdain, E., Kendziorra, E., Lagostina, A., Laine, R., La Palombara, N., Lortholary, M., Lumb, D., Marty, P., Molendi, S., Pigot, C., Poindron, E., Pounds, K., Reeves, J., Reppin, C., Rothenflug, R., Salvetat, P., Sauvageot, J., Schmitt, D., Sembay, S., Short, A., Spragg, J., Stephen, J., Strüder, L., Tiengo, A., Trifoglio, M., Trümper, J., Vercellone, S., Vigroux, L., Villa, G., Ward, M., Whitehead, S., Zonca, E., BARBERA, Marco, Turner, M., Abbey, A., Arnaud, M., Balasini, M., Barbera, M., Belsole, E., Bennie, P., Bernard, J., Bignami, G., Boer, M., Briel, U., Butler, I., Cara, C., Chabaud, C., Cole, R., Collura, A., Conte, M., Cros, A., Denby, M., Dhez, P., Di Coco, G., Dowson, J., Ferrando, P., Ghizzardi, S., Gianotti, F., Goodall, C., Gretton, L., Griffiths, R., Hainaut, O., Hochedez, J., Holland, A., Jourdain, E., Kendziorra, E., Lagostina, A., Laine, R., La Palombara, N., Lortholary, M., Lumb, D., Marty, P., Molendi, S., Pigot, C., Poindron, E., Pounds, K., Reeves, J., Reppin, C., Rothenflug, R., Salvetat, P., Sauvageot, J., Schmitt, D., Sembay, S., Short, A., Spragg, J., Stephen, J., Strüder, L., Tiengo, A., Trifoglio, M., Trümper, J., Vercellone, S., Vigroux, L., Villa, G., Ward, M., Whitehead, S., and Zonca, E.

Subjects
Physics, Instrumentation: detector, Photon, Spectrometer, business.industry, Dynamic range, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Astronomy and Astrophysics, Field of view, Astrophysics, X-rays: general, Optics, Cardinal point, Space and Planetary Science, Calibration, Spectral resolution, business, Focus (optics)
Abstract

The EPIC focal plane imaging spectrometers on XMM-Newton use CCDs to record the images and spectra of celestial X-ray sources focused by the three X-ray mirrors. There is one camera at the focus of each mirror; two of the cameras contain seven MOS CCDs, while the third uses twelve PN CCDs, defining a circular field of view of 30 arcmin diameter in each case. The CCDs were specially developed for EPIC, and combine high quality imaging with spectral resolution close to the Fano limit. A filter wheel carrying three kinds of X-ray transparent light blocking filter, a fully closed, and a fully open position, is fitted to each EPIC instrument. The CCDs are cooled passively and are under full closed loop thermal control. A radio-active source is fitted for internal calibration. Data are processed on-board to save telemetry by removing cosmic ray tracks, and generating X-ray event files; a variety of different instrument modes are available to increase the dynamic range of the instrument and to enable fast timing. The instruments were calibrated using laboratory X-ray beams, and synchrotron generated monochromatic X-ray beams before launch; in-orbit calibration makes use of a variety of celestial X-ray targets. The current calibration is better than 10% over the entire energy range of 0.2 to 10 keV. All three instruments survived launch and are performing nominally in orbit. In particular full field-of-view coverage is available, all electronic modes work, and the energy resolution is close to pre-launch values. Radiation damage is well within pre-launch predictions and does not yet impact on the energy resolution. The scientific results from EPIC amply fulfil pre-launch expectations., Comment: 9 pages, 11 figures, accepted for publication in the A&A Special Issue on XMM-Newton

Published
2000
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77. Herschel Open Time Key Programme—TNOs are Cool: A Survey of the Transneptunian Region

Author

Müller, Th. G., Lellouch, E., Böhnhardt, H., Stansberry, J., Barucci, A., Crovisier, J., Delsanti, A., Doressoundiram, A., Dotto, E., Duffard, R., Fornasier, S., Groussin, O., Gutierrez, P. J., Hainaut, O., Harris, A., Hartogh, P., Hestroffer, D., Horner, J., Jewitt, D., Kidger, M., Kiss, C., Lacerda, P., Lara, L., Lim, T., Mueller, M., Moreno, R., Ortiz, J.-L., Rengel, M., Santos-Sanz, P., Swinyard, B., Thomas, N., Trilling, D., and Astronomy

Subjects
Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

Over one thousand objects have been discovered orbiting beyond Neptune. These trans-Neptunian objects (TNOs) represent the primitive remnants of the planetesimal disk from which the outer planets formed, and is an analog for unseen dust parent-bodies in debris disks observed around other main-sequence stars. The dynamical and physical properties of these bodies provide unique and important constraints on formation and evolution models of the outer Solar System. While the dynamical architecture in this region (also known as the Kuiper Belt) is becoming relatively clear, the physical properties of the objects are only beginning to be revealed. In particular, fundamental parameters such as size, albedo, density and thermal properties are difficult to measure. Measurements of their thermal emission, which peaks at far-IR wavelengths, offer the best means available to determine those physical properties. While Spitzer has provided the first results, notably revealing a large albedo diversity in this population, the increased sensitivity of Herschel and its wavelength coverage will permit profound advances in the field. Within our accepted project we propose to perform radiometric measurements of 139 objects, including 25 known multiple systems. This large sample will permit: (i) A determination of the size distribution of the large (> 200 km) objects, thought to have remained unchanged from the accretion phase. (ii) Systematic searches for correlations between size, albedo, and other physical and orbital parameters, diagnostic of formation and evolution processes. (iii) Determination of mass-density for at least 20 binary TNOs, diagnostic of nebular chemistry and interior structure. (iv) The first study of their thermophysical properties, including thermal inertia and surface emissivity. When combined with measurements of the dust population beyond Neptune (e.g. from the New Horizons mission to Pluto), our results will provide a benchmark for understanding the Solar debris disk, and extra-solar ones as well. We will present an overview of this project. Herschel will be the largest space telescope of its kind when launched (early 2009). Herschel's 3.5-metre diameter mirror will collect long-wavelength infrared radiation from some of the coolest and most distant objects in the Universe. Herschel will be the only space observatory to cover the spectral range from far-infrared to sub-millimetre wavelengths. Herschel's Photodetector Array Camera and Spectrometer (PACS) and its Spectral and Photometric Imaging Receiver (SPIRE) are perfectly suited for the characterisation of trans-Neptunian objects (TNOs), the observable targets of our own debris disk.

Published
2008

78. Herschel Open Time Key Programme: TNOs are cool: a survey of the Transneptunian Region

Author

Müller, T.G., Lellouch, E., Böhnhardt, H, Stansberry, J., Barucci, A, Crovisier, J., Delsanti, A., Doressoundiram, A., Dotto, E., Duffard, R., Fornasier, S., Groussin, O, Gutierrez, P.J., Hainaut, O., Harris, A.W., Hartogh, P., Hestroffer, D., Horner, J., Jewitt, D., Kidger, M., Kiss, C., Lacerda, P., Lara, L., Lim, T, Mueller, M., Moreno, R., Ortiz, J.-L., Rengel, M., Santos-Sanz, P., Swinyard, B., Thomas, N., and Trilling, D.

Subjects
Asteroiden und Kometen, Trans-Neptunian objects, Herschel Space Telescope, Infrared observations, Herschel, Kuiper Belt, Astrophysics::Earth and Planetary Astrophysics, thermal emission, Astrophysics::Galaxy Astrophysics, TNOs
Abstract

Over one thousand objects have been discovered orbiting beyond Neptune. These trans-Neptunian objects (TNOs) represent the primitive remnants of the planetesimal disk from which the outer planets formed, and is an analog for unseen dust parent-bodies in debris disks observed around other main-sequence stars. The dynamical and physical properties of these bodies provide unique and important constraints on formation and evolution models of the outer Solar System. While the dynamical architecture in this region (also known as the Kuiper Belt) is becoming relatively clear, the physical properties of the objects are only beginning to be revealed. In particular, fundamental parameters such as size, albedo, density and thermal properties are difficult to measure. Measurements of their thermal emission, which peaks at far-IR wavelengths, offer the best means available to determine those physical properties. While Spitzer has provided the first results, notably revealing a large albedo diversity in this population, the increased sensitivity of Herschel and its wavelength coverage will permit profound advances in the field. Within our accepted project we propose to perform radiometric measurements of 139 objects, including 25 known multiple systems.

Published
2008

80. Jupiter Trojans: The Physical Properties Of Members Of Dynamical Families

Author

Dotto, Elisabetta, Fornasier, S., Barucci, M., Hainaut, O., Boehnhardt, H., Licandro, J., Marzari, F., Bergh, C., Fiore De Luise, 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), Pôle Planétologie du LESIA, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)

Subjects
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

International audience

Published
2006

81. Jupiter Trojans: a Survey of Members of Dynamical Families

Author

Dotto, E., Fornasier, S., Barucci, M. A., Licandro, J., Boehnhardt, H., Hainaut, O., Marzari, F., Bergh, C., Fiore De Luise, 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), Pôle Planétologie du LESIA, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)

Subjects
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

International audience

Published
2005

82. Post-perihelion observations of comet 1P/Halley. V: rh = 28.1 AU

Author

Hainaut, O. R., Delsanti, Audrey, Meech, Karen J., West, Richard M., European Southern Observatory, 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), Pôle Planétologie du LESIA, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Institute for Astronomy, University of Hawaii, and European Southern Observatory (ESO)

Subjects
[SDU]Sciences of the Universe [physics], [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

International audience; Deep CCD observations have been performed simultaneously with the three 8.2 m Very Large Telescopes at Paranal, in the direction of comet 1P/Halley, on March 6-8, 2003. The comet, at heliocentric distance r=28.1 AU, was convincingly detected (at S/N=8) on a composite of 32 284 s exposure, as a point-source located 1.4'' from the expected position. The object is also visible (at the S/N=3-5 level) on independent per-night or per-instrument composites, confirming the reality of the object, and the match of the observed motion over 3 consecutive nights with the predicted motion of 1P/Halley guarantees that this cannot be another Solar System object. The magnitude of the object, R=28.22 ± 0.13, is compatible with the average cross-section of the bare nucleus.

Published
2004
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84. Near Earth Asteroid search and follow-up beyond 22nd magnitude

Author

Boattini, A., D'Abramo, G., Scholl, H., Hainaut, O. R., Boehnhardt, H., West, R., Carpino, M., Hahn, G.J., Michelsen, R., Forti, G., Pravec, P., Valsecchi, G. B., and Asher, D. J.

Subjects
asteroids, surveys, solar system: general, minor planets, astrometry, celestial mechanics
Published
2004

85. Dynamical Modeling of the Deep Impact Dust Ejecta Cloud

Author

Bonev, T., primary, Ageorges, N., additional, Bagnulo, S., additional, Barrera, L., additional, Böhnhardt, H., additional, Hainaut, O., additional, Jehin, E., additional, Käufl, H. U., additional, Kerber, F., additional, LoCurto, G., additional, Manfroid, J., additional, Marco, O., additional, Pantin, E., additional, Pompei, E., additional, Saviane, I., additional, Selman, F., additional, Sterken, C., additional, Rauer, H., additional, Tozzi, G. P., additional, and Weiler, M., additional

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86. ESO Spectrophotometry of Comet 9P/Tempel 1

Author

Weiler, M., primary, Rauer, H., additional, Sterken, C., additional, Knollenberg, J., additional, Jehin, E., additional, Pompei, E., additional, Hainaut, O., additional, Tozzi, G. P., additional, and Manfroid, J., additional

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87. Continued activity in P/2013 P5 PANSTARRS

Author

Hainaut, O. R., primary, Boehnhardt, H., additional, Snodgrass, C., additional, Meech, K. J., additional, Deller, J., additional, Gillon, M., additional, Jehin, E., additional, Kuehrt, E., additional, Lowry, S. C., additional, Manfroid, J., additional, Micheli, M., additional, Mottola, S., additional, Opitom, C., additional, Vincent, J.-B., additional, and Wainscoat, R., additional

Published
2014
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88. Modeling the color diversity of Kuiper Belt Objets : Cometary Activity as an alternative rejuvenating process

Author

Delsanti, Audrey, Hainaut, O. R., Jourdeuil, E., 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), Pôle Planétologie du LESIA, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)

Subjects
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

International audience

Published
2003

89. MBOSS Color Evolution Tracks: A Simple Empirical Model

Author

Hainaut, O. R., Delsanti, Audrey, Jourdeuil, E., 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), Pôle Planétologie du LESIA, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)

Subjects
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

International audience

Published
2002

90. Simultaneous Visible/IR Photometry of Minor Bodies of the Outer Solar System with the ESO-Very Large Telescopes

Author

Delsanti, Audrey, Hainaut, O. R., Boehnhardt, Hermann, Meech, Karen J., Barrera, Luis, 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), Pôle Planétologie du LESIA, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)

Subjects
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

International audience

Published
2002

91. Colors of Minor Bodies in the Outer Solar System (Hainaut+, 2002)

Author

Hainaut, O. R., Delsanti, Audrey, 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), Pôle Planétologie du LESIA, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)

Subjects
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

International audience

Published
2002

94. Photometry of Kuiper Belt objects with the ESO Large Program

Author

Delsanti, A., Boehnhardt, H., Hainaut, O., Barucci, A., Doressoundiram, A., Barrera, L., Bergh, C., Birkle, K., Dotto, E., Lazzarin, M., Meech, K., Jose L. Ortiz, Romon, J., Sekiguchi, T., Thomas, N., Tozzi, G. P., Watanabe, J., West, R., 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), Pôle Planétologie du LESIA, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)

Subjects
Photometry, Kuiper Belt Objects, ESO Large Program, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

International audience

Published
2002

95. GRB 011121

Author

Greiner, J., Klose, S., Zeh, A., Lamer, G., Scholz, R.-D., Lodieu, N., van den Heuvel, E.P.J., Vreeswijk, P.M., Kaper, L., Castro-Tirado, A.J., Fruchter, A., Hjorth, J., Pian, E., Doublier, V., Hainaut, O., Hubrig, S., Johnson, R., Kaufer, A., Kuerster, M., Pompej, E., and High Energy Astrophys. & Astropart. Phys (API, FNWI)

Published
2001

96. Mini, Midi, Maxi TNO Observations at ESO Telescopes

Author

Boehnhardt, H., Barrera, L., Barucci, M. A., DE BERG, C., Birkle, K., Davies, J., Delsanti, A., Doressoundiram, A., Dotto, E., Hainaut, O., Lazzarin, Monica, Meech, K., Ortiz, J. L., Romon, J., Rouselot, P., Sekiguchi, T., Thomas, N., Tozzi, G. P., Watanabe, J., and West, R. M.

Subjects
Spectrophotometry, Trans Neptunian Objects
Published
2001

97. The first year of optical-IR observations of SN1998bw

Author

Danziger, I.J., Augusteijn, T., Brewer, J., Cappellaro, E., Doublier, V., Galama, T.J., Gonzalez, J.F., Hainaut, O., Leibundgut, B., Lidman, C., Mazzali, P., Nomoto, K., Patat, F., Spyromilio, J., Turatto, M., van Paradijs, J.A., Vreeswijk, P.M., Walsh, J., Livio, M., Panagia, N., Sahu, K., and High Energy Astrophys. & Astropart. Phys (API, FNWI)

Published
2001

98. ESO Large Program for TNOs: Presentation and First Results

Author

Barucci, M. A., Boehnhardt, H., Delsanti, A. C., Barrera, L., DE BERGH, C., Birkle, K., Davies, J., Doressoundiram, A., Dotto, E., Hainaut, O. R., Lazzarin, Monica, Meech, K. J., Ortiz, J. L., Romon, J., Rousselot, P., Sekiguchi, T., Thomas, N., Tozzi, G. P., Watanabe, J. I., and West, R.

Subjects
Spectrophotometry, Trans Neptunians Objects, ESO Large Program, Centaurs
Published
2001

99. The nucleus of Comet 67P/Churyumov-Gerasimenko: A new shape model and thermophysical analysis

Author

Lowry, S., Duddy, S.R., Rozitis, B., Green, S.F., Fitzsimmons, A., Snodgrass, C., Hsieh, H.H., Hainaut, O., Lowry, S., Duddy, S.R., Rozitis, B., Green, S.F., Fitzsimmons, A., Snodgrass, C., Hsieh, H.H., and Hainaut, O.

Abstract

Context. Comet 67P/Churyumov-Gerasimenko is the target of the European Space Agency Rosetta spacecraft rendez-vous mission. Detailed physical characteristation of the comet before arrival is important for mission planning as well as providing a test bed for ground-based observing and data-analysis methods. Aims. To conduct a long-term observational programme to characterize the physical properties of the nucleus of the comet, via ground-based optical photometry, and to combine our new data with all available nucleus data from the literature. Methods. We applied aperture photometry techniques on our imaging data and combined the extracted rotational lightcurves with data from the literature. Optical lightcurve inversion techniques were applied to constrain the spin state of the nucleus and its broad shape. We performed a detailed surface thermal analysis with the shape model and optical photometry by incorporating both into the new Advanced Thermophysical Model (ATPM), along with all available Spitzer 8-24 ?m thermal-IR flux measurements from the literature. Results. A convex triangular-facet shape model was determined with axial ratios b/a = 1.239 and c/a = 0.819. These values can vary by as much as 7% in each axis and still result in a statistically significant fit to the observational data. Our best spin state solution has Psid = 12.76137 ± 0.00006 h, and a rotational pole orientated at Ecliptic coordinates ? = 78°(±10°), ? = + 58°(±10°). The nucleus phase darkening behaviour was measured and best characterized using the IAU HG system. Best fit parameters are: G = 0.11 ± 0.12 and H R(1,1,0) = 15.31 ± 0.07. Our shape model combined with the ATPM can satisfactorily reconcile all optical and thermal-IR data, with the fit to the Spitzer 24 ?m data taken in February 2004 being exceptionally good. We derive a range of mutually-consistent physical parameters for each thermal-IR data set, including effective radius, geometric albedo, surface thermal inertia and roughness

Published
2012

100. GRB000607, optical observations

Author

Masetti, N., Eliana Palazzi, Pian, E., Castro-Tirado, A. J., Hudec, R., Soldan, J., Bernas, M., Pata, P., Castro Cerón, J. M., Kouveliotou, C., Hjorth, J., Vreeswijk, P. M., Den Heuvel, E. P. J., Greiner, J., Zoccali, M., Hainaut, O., and High Energy Astrophys. & Astropart. Phys (API, FNWI)

Published
2000

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