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73 results on '"Coudé du Foresto, Vincent"'

51. Studying hot exozodiacal dust with near-infrared interferometry

Author

Absil, Olivier, primary, Defrère, Denis, additional, Le Bouquin, Jean-Baptiste, additional, Mollier, Benjamin, additional, Augereau, Jean-Charles, additional, Coudé du Foresto, Vincent, additional, Di Folco, Emmanuel, additional, Ertel, Steve, additional, and ten Brummelaar, Theo, additional

Published
2012
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52. An integrated payload design for the Exoplanet Characterisation Observatory (EChO)

Author

Swinyard, Bruce, primary, Tinetti, Giovanna, additional, Eccleston, Paul, additional, Adriani, Alberto, additional, Beaulieu, Jean-Philippe, additional, Belenguer Davila, Tomas, additional, Bowles, Neil, additional, Bryson, Ian, additional, Coudé du Foresto, Vincent, additional, Ferlet, Marc, additional, Hartogh, Paul, additional, Lagage, Pierre-Olivier, additional, Lim, Tanya, additional, Malaguti, Giuseppe, additional, López-Morales, Mercedes, additional, Micela, Giuseppina, additional, Morgante, Gianluca, additional, Nørgaard-Nielsen, Hans Ulrik, additional, Ollivier, Marc, additional, Pace, Emanuele, additional, Pascale, Enzo, additional, Piccioni, Giuseppe, additional, Ramos Zapata, Gonzalo, additional, Reess, Jean-Michel, additional, Ribas, Ignasi, additional, Sozzetti, Alessandro, additional, Tennyson, Jonathan, additional, Tessenyi, Marcell, additional, Swain, Mark R., additional, Winter, Berend, additional, Waldmann, Ingo, additional, Wright, Gillian, additional, Zapatero Osorio, Maria-Rosa, additional, and Coustenis, Athena, additional

Published
2012
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53. Antarctic planet interferometer

Author

Traub, Wesley A., Swain, Mark R., Walker, Christopher K., Storey, John W. V., Coudé du Foresto, Vincent, Fossat, Eric, Vakili, Farrokh, Stark, Anthony A., Lloyd, James P., Lawson, Peter R., Burrows, Adam S., Ireland, Michael, Millan-Gabet, Rafael, van Belle, Gerard T., Lane, Benjamin, Vasisht, Gautam, Travouillon, Tony, Traub, Wesley A., Swain, Mark R., Walker, Christopher K., Storey, John W. V., Coudé du Foresto, Vincent, Fossat, Eric, Vakili, Farrokh, Stark, Anthony A., Lloyd, James P., Lawson, Peter R., Burrows, Adam S., Ireland, Michael, Millan-Gabet, Rafael, van Belle, Gerard T., Lane, Benjamin, Vasisht, Gautam, and Travouillon, Tony

Abstract

The Antarctic Planet Interferometer is a concept for an instrument designed to detect and characterize extrasolar planets by exploiting the unique potential of the best accessible site on earth for thermal infrared interferometry. High-precision interferometric techniques under development for extrasolar planet detection and characterization (differential phase, nulling and astrometry) all benefit substantially from the slow, low-altitude turbulence, low water vapor content, and low temperature found on the Antarctic plateau. At the best of these locations, such as the Concordia base being developed at Dome C, an interferometer with two-meter diameter class apertures has the potential to deliver unique science for a variety of topics, including extrasolar planets, active galactic nuclei, young stellar objects, and protoplanetary disks.

Published
2004

54. Design of a star, planet and exo-zodiacal cloud simulator for the nulling testbench PERSEE

Author

Hénault, François, primary, Girard, Paul, additional, Marcotto, Aurelie, additional, Mauclert, Nicolas, additional, Bailet, Christophe, additional, Lopez, Bruno, additional, Millour, Florentin, additional, Rabbia, Yves, additional, Roussel, Alain, additional, Barillot, Marc, additional, Lozi, Julien, additional, Cassaing, Frederic, additional, Houairi, Kamel, additional, Sorrente, Beatrice, additional, Montri, Joseph, additional, Lhome, Emilie, additional, Reess, Jean-Michel, additional, Pham, Laurie, additional, Buey, Jean-Tristan, additional, Coudé du Foresto, Vincent, additional, Jacquinod, Sophie, additional, Ollivier, Marc, additional, and Le Duigou, Jean-Michel, additional

Published
2011
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55. Potential of balloon payloads for in flight validation of direct and nulling interferometry concepts

Author

Demangeon, Olivier, primary, Ollivier, Marc, additional, Le Duigou, Jean-Michel, additional, Cassaing, Frédéric, additional, Coudé du Foresto, Vincent, additional, Mourard, Denis, additional, Kern, Pierre, additional, Lam Trong, Tien, additional, Evrard, Jean, additional, Absil, Olivier, additional, Defrere, Denis, additional, and Lopez, Bruno, additional

Published
2010
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59. Darwin—an experimental astronomy mission to search for extrasolar planets

Author

Cockell, Charles S., primary, Herbst, Tom, additional, Léger, Alain, additional, Absil, O., additional, Beichman, Charles, additional, Benz, Willy, additional, Brack, Andre, additional, Chazelas, Bruno, additional, Chelli, Alain, additional, Cottin, Hervé, additional, Coudé du Foresto, Vincent, additional, Danchi, William, additional, Defrère, Denis, additional, den Herder, Jan-Willem, additional, Eiroa, Carlos, additional, Fridlund, Malcolm, additional, Henning, Thomas, additional, Johnston, Kenneth, additional, Kaltenegger, Lisa, additional, Labadie, Lucas, additional, Lammer, Helmut, additional, Launhardt, Ralf, additional, Lawson, Peter, additional, Lay, Oliver P., additional, Liseau, Rene’, additional, Martin, Stefan R., additional, Mawet, Dimitri, additional, Mourard, Denis, additional, Moutou, Claire, additional, Mugnier, Laurent, additional, Paresce, Francesco, additional, Quirrenbach, Andreas, additional, Rabbia, Yves, additional, Rottgering, Huub J. A., additional, Rouan, Daniel, additional, Santos, Nuno, additional, Selsis, Franck, additional, Serabyn, Eugene, additional, Westall, Frances, additional, White, Glenn, additional, Ollivier, Marc, additional, and Bordé, Pascale, additional

Published
2008
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61. CHARA/FLUOR updates and performance

Author

Mérand, Antoine, primary, Coudé du Foresto, Vincent, additional, Kellerer, Aglaé, additional, ten Brummelaar, Theo, additional, Reess, Jean-Michel, additional, and Ziegler, Denis, additional

Published
2006
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64. Method of estimating time scales of the atmospheric piston and its application at Dome C (Antarctica)

Author

Kellerer, Aglae, Sarazin, Marc, Coudé Du Foresto, Vincent, Agabi, Karim, Aristidi, Eric, Sadibekova, Tatyana, Du Foresto, Vincent Coudé, 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), European Southern Observatory (ESO), Joseph Louis LAGRANGE (LAGRANGE), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), 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)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Université Nice Sophia Antipolis (... - 2019) (UNS), Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), and Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Daytime, Coherence time, Fizeau interferometer, Materials Science (miscellaneous), 01 natural sciences, Industrial and Manufacturing Engineering, law.invention, 010309 optics, Piston, Optics, law, 0103 physical sciences, Astronomical interferometer, Atmospheric and ocean optics, Business and International Management, Instrumentation, 010303 astronomy & astrophysics, Physics, business.industry, Coherence (statistics), Interferometry, Temporal resolution, measurement, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], business, and metrology
Abstract

International audience; Analysis of the first interferometric fringes recorded at Dome C, Antarctica are presented. Measurements were taken 31 January and 1 February 2005 during daytime. Our purpose in performing the analysis was to measure temporal fluctuations of the atmospheric piston, which are critical for interferometers, and determine their sensitivity. These scales are derived through the motion of the image that is formed in the focal plane of a Fizeau interferometer. We could establish a lower limit to the coherence time by studying the decay rate of correlation between successive fringes. Coherence times are measured to be larger than 10 ms, i.e., at least three times higher than the median coherence time measured at the site of Paranal (3.3 ms).

Published
2006

65. Cepheids Observations Using CHARA/FLUOR: αUMi and δCep.

Author

Leibundgut, Bruno, Richichi, A., Delplancke, F., Paresce, F., Chelli, A., Méerand, Antoine, Kervella, Pierre, Coudé du Foresto, Vincent, Ridgway, Stephen T., Aufdenberg, Jason, Brummelaar, Theo ten, Berger, David, Sturmann, Judit, Sturmann, Lazlo, Turner, Nils, and McAlister, Harold A.

Abstract

Over the past decade, stellar interferometry emerged as a powerful tool to measure distances to Cepheids using the pulsation parallax.method, also called the Baade-Wesselink (BW) method. However, as interferometers gain in baseline length and precision, the assumptions on which the interferometric BW method relies have to be refined: the projection factor (to convert radial velocity in pulsation velocity) and the center to limb darkening (to properly interpret interferometric data) have to be studied theoretically and/or observationally. We report here interferometric observations of two classical Cepheids, using the FLUOR beam combiner \cite{Foresto2003} installed at the CHARA Array \cite{tenBrummelaar2005}. αUMi was observed in both the first and the second lobes of the visibility curve, enabling us to potentially measure its center to limb darkening. We measured with high precision the angular diameter variation for δCep. Combined with the distance to this star from HST/FGS cite{Benedict2002}, these measurements provide directly the projection factor [ABSTRACT FROM AUTHOR]

Published
2008
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67. Ultrafast laser inscription of integrated optics two-telescope beam combiners for K-band interferometry at the CHARA array

Author

Mérand, Antoine, Sallum, Stephanie, Sanchez-Bermudez, Joel, Siliprandi, Jacopo, MacLachlan, David G., Ross, Calum A., Sharma, Tarun K., Labadie, Lucas, Madhav, Kalaga, Nayak, Abani S., Dinkelaker, Aline N., Roth, Martin M., Pedretti, Ettore, ten Brummelaar, Theo A., Scott, Nicholas J., Coudé du Foresto, Vincent, Thomson, Robert R., and Benoît, Aurélien

Published
2022
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68. Design and performance of the Exo-planet Characterisation Observatory (EChO) integrated payload

Author

Oschmann, Jacobus M., Clampin, Mark, Fazio, Giovanni G., MacEwen, Howard A., Swinyard, Bruce, Tessenyi, Marcel, Tinetti, Giovanna, Waldmann, Ingo, Eccleston, Paul, Ferlet, Marc, Irshad, Ranah, Lim, Tanya, Middleton, Kevin, Bradshaw, Tom, Crook, Martin, Hunt, Tom, Winter, Berend, Bryson, Ian, Bezawada, Naidu, Taylor, William, Bowles, Neil, Pascale, Enzo, Morgante, Gianluca, Pace, Emanuele, Adriani, Alberto, Reess, Jean-Michel, Drossart, Pierre, Coudé du Foresto, Vincent, Ollivier, Marc, Ottensamer, Roland, Rataj, Mirek, Ramos Zapata, Gonzalo, Schrader, Jan-Rutger, Selig, Avri, Isaak, Kate, Linder, Martin, Puig, Ludovic, Hartogh, Paul, Lovis, Christophe, Micela, Giusi, Ribas, Ignasi, Snellen, Ignas, and Beaulieu, Jean-Phillippe

Published
2014
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69. The Science of Exoplanets and Their Systems

Author

Fridlund, Malcolm, Alibert, Yann, Coudé Du Foresto, Vincent, Elkins-Tanton, Linda T., Rauer, Heike, Kley, Willy, Falanga, Maurizio, Encrenaz, Therese, Chassefière, Eric, Linsky, Jeffrey, Hatzes, Artie P., Lorenzen, Winfried, Bonnet, Roger-Maurice, Udry, Stephane, Liseau, Rene, Lammer, Helmut, Raymond, Sean N., Helled, Ravit, Güdel, Manuel, Blanc, Michel, Lin, Douglas, Charbonneau, David, and Benz, Willy

Subjects
13. Climate action, 530 Physics, 520 Astronomy, 620 Engineering
Abstract

A scientific forum on “The Future Science of Exoplanets and Their Systems,” sponsored by Europlanet* and the International Space Science Institute (ISSI)† and co-organized by the Center for Space and Habitability (CSH)‡ of the University of Bern, was held during December 5 and 6, 2012, in Bern, Switzerland. It gathered 24 well-known specialists in exoplanetary, Solar System, and stellar science to discuss the future of the fast-expanding field of exoplanetary research, which now has nearly 1000 objects to analyze and compare and will develop even more quickly over the coming years. The forum discussions included a review of current observational knowledge, efforts for exoplanetary atmosphere characterization and their formation, water formation, atmospheric evolution, habitability aspects, and our understanding of how exoplanets interact with their stellar and galactic environment throughout their history. Several important and timely research areas of focus for further research efforts in the field were identified by the forum participants. These scientific topics are related to the origin and formation of water and its delivery to planetary bodies and the role of the disk in relation to planet formation, including constraints from observations as well as star-planet interaction processes and their consequences for atmosphere-magnetosphere environments, evolution, and habitability. The relevance of these research areas is outlined in this report, and possible themes for future ISSI workshops are identified that may be proposed by the international research community over the coming 2–3 years.

70. Measuring High Precision and Unbiased Distances to Cepheids using Optical Interferometry: Recent Results from the CHARA Array

Author

ten Brummelaar, Theo, Merand, Antoine, Mcalister, Harold A., Coudé Du Foresto, Vincent, Ridgway, Stephen, Sturmann, Judit, Sturmann, Laszlo, Turner, Nils H., 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 Astronomie du LESIA, and 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)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris

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

International audience

71. Design of a star, planet and exo-zodiacal cloud simulator for the nulling testbench PERSEE

Author

Hénault, François, Girard, Paul, Marcotto, Aurelie, Mauclert, Nicolas, Bailet, Christophe, Lopez, Bruno, Millour, Florentin, Rabbia, Yves, Roussel, Alain, Barillot, Marc, Lozi, Julien, Cassaing, Frederic, Houairi, Kamel, Sorrente, Beatrice, Montri, Joseph, Lhome, Emilie, Reess, Jean-Michel, Pham, Laurie, Buey, Jean-Tristan, Coudé du Foresto, Vincent, Jacquinod, Sophie, Ollivier, Marc, and Le Duigou, Jean-Michel

Abstract

On-going developments on the PERSEE nulling testbench include the realization of a focal plane simulator featuring one central star, an extra-solar planet orbiting around it, and an Exo-Zodiacal Cloud (EZC) surrounding the observed stellar system. PERSEE (Pégase Experiment for Research and Stabilization of Extreme Extinction) is a laboratory testbench jointly developed by a Consortium of six French institutes and companies, incorporating Observatoire de la Côte d'Azur (OCA) who is in charge of the manufacturing and procurement of the future Star and Planet Simulator (SPS). In this communication is presented a complete description of the SPS, including general requirements, techniques employed for simulating the observed planet and EZC, opto-mechanical design and expected performance. The current status of the SPS activities is summarized in the conclusion, pending final integration on the PERSEE test bench in September 2011.

Published
2011
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72. First Science with JouFLU

Author

Scott, Nicholas Jon, Barbet, Virginie, Observatoire de Paris, Université Paris sciences et lettres (PSL), and Coudé du Foresto, Vincent

Subjects
astronomy, Interférométrie, Interféromètres, Grands télescopes, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], [PHYS.ASTR] Physics [physics]/Astrophysics [astro-ph], Enveloppes circumstellaires
Abstract

Jouvence de FLUOR (JouFLU) est une refonte majeure du combineur de faisceaux FLUOR (unité à fibres optiques pour recombinaison optique) construite par le Laboratoire d’études spatiales et d’instrumentation en astrophysique (LESIA) et installée à la base CHARA. Ces mises à niveau améliorent la précision, l’observation de l’efficacité, le débit et l’intégration de FLUOR avec le tableau CHARA, ainsi que l’introduction de nouveaux modes de fonctionnement pour cet instrument d’interférométrie de haute précision. De telles observations de haute précision avec FLUOR ont fourni les premières détections non ambiguës de poussière chaude autour des étoiles de la séquence principale, montrant une population étonnamment dense de grains de poussière (sub) micrométriques proches de leur température de sublimation, 1400 K. Des modèles concurrents expliquent la persistance de ce phénomène. poussière; Certaines d'entre elles suggèrent que la production de poussière est un processus ponctuel et chaotique alimenté par des collisions d'astéroïdes et une chute de la comète qui montrerait une variabilité sur une période de quelques années. En réobservant les étoiles de l’enquête sur les disques exozodiacaux, nous avons recherché des variations dans les disques détectés. Nous avons trouvé des preuves que pour certaines étoiles, la quantité de flux circumstellaire provenant de ces disques exozodiacaux précédemment détectés, ou exozodis, a varié. Le flux de certains exozodis a augmenté, pour certains, il a diminué et pour quelques-uns, la quantité est restée constante. Ces résultats sont intrigants et seront sans aucun doute utiles pour la modélisation future de ce phénomène. En outre, une surveillance à long terme est suggérée pour certains de ces objets afin de confirmer les détections et de déterminer le taux de variation.

Published
2015

73. Filtrage Modal et Recombinaison de Grands Télescopes. Contributions à l'Instrument FLUOR

Author

Ruilier, Cyril, ONERA - The French Aerospace Lab [Châtillon], ONERA-Université Paris Saclay (COmUE), Observatoire de Paris - Site de Meudon (OBSPM), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Diderot - Paris VII, Coudé du Foresto Vincent, and Ruilier, Cyril

Subjects
Spatial filtering, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], Interférométrie stellaire, Atmospheric turbulence, Astronomical instruments, Étoiles: diamètres, Turbulence atmosphérique, [SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph], Stellar interferometry, Haute résolution angulaire, Filtrage spatial, High angular resolution, Fibres optiques monomodes, Optique adaptative, Single-mode optical fibers, Instruments astronomiques, Stars: diameters, Rayonnement infrarouge, Adaptive optics, Infrared radiation
Abstract

Single-mode optical fibers bring a solution to the filtering of wavefront defects and to calibration on the visibilities in stellar interferometry. The recombination instrument FLUOR (Fiber Linked Unit for Optical Recombination), set on the IOTA interferometer in Arizona, is based on this concept. Ground-based large interferometers currently in the design stage will combine single-mode optical fibers and adaptive optics to provide maximum precision and sensitivity. The interfacing of these systems of Adaptive Optics with optical fibers was studied. Analytical laws of dimensioning and prediction of the performances was derived and were confirmed by computer simulations. A qualitative comparison between the spatial filtering provided by a single-mode optical fiber and by a pinhole makes it possible to conclude on the superiority of the first method within the framework of an interferometric use. Limitations in rate of acquisition reduced the possibilities of the instrument FLUOR. A fast system of sweeping of the optical path difference was established in order to better sample the transfer function and to decrease the statistical error on the estimate of the visibilities. Simultaneously with these technical improvements, the former version of the instrument was used for scientific observations. Series of measurements were carried out on pulsating stars. The visibilities are estimated with a precision better than the percent and allow a comparison with the theoretical models representing these objects., Les fibres optiques monomodes apportent une solution au filtrage spatial des défauts du front d'onde et à l'étalonnage des visibilités en interférométrie stellaire. L'instrument de recombinaison FLUOR (Fiber Linked Unit for Optical Recombination), installé sur l'interféromètre IOTA en Arizona, est fondé sur ce principe. De grands interféromètres au sol actuellement en projet utiliseront des fibres optiques monomodes et des systèmes d'Optique Adaptative afin de garantir de meilleures précisions et une meilleure sensibilité. L'interfaçage de ces systèmes d'Optique Adaptative avec des fibres optiques a été étudié. Des lois analytiques de dimensionnement et de prédiction des performances ont été dérivées et confirmées par des simulations numériques. Une comparaison qualitative entre le filtrage spatial opéré par une fibre monomode et celui opéré par un trou permet de conclure sur la supériorité de la première méthode dans le cadre d'une utilisation interférométrique. Des limitations en cadence d'acquisition réduisaient les possibilités de l'instrument FLUOR. Un système de balayage rapide de la différence de marche a été implanté afin de mieux échantillonner la fonction de transfert et de diminuer l'erreur statistique sur l'estimation des visibilités. En parallèle à ces améliorations techniques, la version antérieure de l'instrument a été utilisée pour des observations scientifiques. Des campagnes de mesures ont été menées sur des étoiles pulsantes. Les visibilités sont estimées avec une précision meilleure que le pourcent et permettent une comparaison aux modèles théoriques représentant ces objets.

Published
1999

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