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87 results on '"Chelli, Alain"'

1. Pseudomagnitude Distances: Application to the Pleiades cluster

Author

Chelli, Alain and Duvert, Gilles

Subjects
Astrophysics - Solar and Stellar Astrophysics
Abstract

The concept of pseudomagnitude was recently introduced by Chelli et al. (2016), to estimate apparent stellar diameters using a strictly observational methodology. Pseudomagnitudes are distance indicators, which have the remarkable property of being reddening free. In this study, we use Hipparcos parallax measurements to compute the mean absolute pseudomagnitudes of solar neighbourhood dwarf stars as a function of their spectral type. To illustrate the use of absolute pseudomagnitudes, we derive the distance moduli of $360$ Pleiades stars and find that the centroid of their distribution is $5.715\pm0.018$, corresponding to a distance of $139.0\pm1.2$\,pc. We locate the subset of $\sim 50$ Pleiades stars observed by Hipparcos at a mean distance of $135.5\pm3.7$\,pc, thus confirming the frequently reported anomaly in the Hipparcos measurements of these stars.

Published
2016
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2. Pseudomagnitudes and Differential Surface Brightness: Application to the apparent diameter of stars

Author

Chelli, Alain, Duvert, Gilles, Bourgès, Laurent, Mella, Guillaume, Lafrasse, Sylvain, Bonneau, Daniel, and Chesneau, Olivier

Subjects
Astrophysics - Solar and Stellar Astrophysics
Abstract

The diameter of a star is a major observable that serves to test the validity of stellar structure theories. It is also a difficult observable that is mostly obtained with indirect methods since the stars are so remote. Today only ~600 apparent star diameters have been measured by direct methods: optical interferometry and lunar occultations. Accurate star diameters are now required in the new field of exoplanet studies, since they condition the planets' sizes in transit observations, and recent publications illustrate a visible renewal of interest in this topic. Our analysis is based on the modeling of the relationship between measured angular diameters and photometries. It makes use of two new reddening-free concepts: a distance indicator called pseudomagnitude, and a quasi-experimental observable that is independent of distance and specific to each star, called the differential surface brightness (DSB). The use of all the published measurements of apparent diameters that have been collected so far, and a careful modeling of the DSB allow us to estimate star diameters with a median statistical error of 1%, knowing their spectral type and, in the present case, the VJHKs photometries. We introduce two catalogs, the JMMC Measured Diameters Catalog (JMDC), containing measured star diameters, and the second version of the JMMC Stellar Diameter Catalog (JSDC), augmented to about 453000 star diameters. Finally, we provide simple formulas and a table of coefficients to quickly estimate stellar angular diameters and associated errors from (V, Ks) magnitudes and spectral types., Comment: 9 pages, 4 figures, 2 tables + tables electronically available on http://www.jmmc.fr/jmdc and http://www.jmmc.fr/jsdc

Published
2016
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3. High spectral resolution imaging of the dynamical atmosphere of the red supergiant Antares in the CO first overtone lines with VLTI/AMBER

Author

Ohnaka, Keiichi, Hofmann, Karl-Heinz, Schertl, Dieter, Weigelt, Gerd, Baffa, Carlo, Chelli, Alain, Petrov, Romain, and Robbe-Dubois, Sylvie

Subjects
Astrophysics - Solar and Stellar Astrophysics
Abstract

We present high spectral resolution aperture-synthesis imaging of the red supergiant Antares (alpha Sco) in individual CO first overtone lines with VLTI/AMBER. The reconstructed images reveal that the star appears differently in the blue wing, line center, and red wing and shows an asymmetrically extended component. The appearance of the star within the CO lines changes drastically within one year, implying a significant change in the velocity field in the atmosphere. Our modeling suggests an outer atmosphere (MOLsphere) extending to 1.2--1.4 stellar radii with CO column densities of (0.5--1)x10^{20} cm^{-2} and a temperature of ~2000 K. While the velocity field in 2009 is characterized by strong upwelling motions at 20--30 km/s, it changed to strong downdrafts in 2010. On the other hand, the AMBER data in the continuum show only a slight deviation from limb-darkened disks and only marginal time variations. We derive a limb-darkened disk diameter of 37.38+/-0.06 mas and a power-law-type limb-darkening parameter of (8.7+/-1.6)x10^{-2} (2009) and 37.31+/-0.09 mas and (1.5+/-0.2)x10^{-1} (2010). We also obtain Teff = 3660+/-120 K and log L/Lsun = 4.88+/-0.23, which suggests a mass of 15+/-5 Msun with an age of 11-15 Myr. This age is consistent with the recently estimated age for the Upper Scorpius OB association. The properties of the outer atmosphere of Antares are similar to those of another well-studied red supergiant, Betelgeuse. The density of the extended outer atmosphere of Antares and Betelgeuse is higher than predicted by the current 3-D convection simulations by at least six orders of magnitude, implying that convection alone cannot explain the formation of the extended outer atmosphere., Comment: 18 pages, 16 figures, accepted for publication in Astronomy and Astrophysics, short discussion on the age of Antares and the Upper Scorpius OB association added, movies of the reconstructed images available at http://www.mpifr-bonn.mpg.de/staff/kohnaka/

Published
2013
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4. High precision astrometry mission for the detection and characterization of nearby habitable planetary systems with the Nearby Earth Astrometric Telescope (NEAT)

Author

Malbet, Fabien, Léger, Alain, Shao, Michael, Goullioud, Renaud, Lagage, Pierre-Olivier, Brown, Anthony G. A., Cara, Christophe, Durand, Gilles, Eiroa, Carlos, Feautrier, Philippe, Jakobsson, Björn, Hinglais, Emmanuel, Kaltenegger, Lisa, Labadie, Lucas, Lagrange, Anne-Marie, Laskar, Jacques, Liseau, René, Lunine, Jonathan, Maldonado, Jesús, Mercier, Manuel, Mordasini, Christoph, Queloz, Didier, Quirrenbach, Andreas, Sozzetti, Alessandro, Traub, Wesley, Absil, Olivier, Alibert, Yann, Andrei, Alexandre Humberto, Arenou, Frédéric, Beichman, Charles, Chelli, Alain, Cockell, Charles S., Duvert, Gilles, Forveille, Thierry, Garcia, Paulo J. V., Hobbs, David, Krone-Martins, Alberto, Lammer, Helmut, Meunier, Nadège, Minardi, Stefano, de Almeida, André Moitinho, Rambaux, Nicolas, Raymond, Sean, Röttgering, Huub J. A., Sahlmann, Johannes, Schuller, Peter A., Ségransan, Damien, Selsis, Franck, Surdej, Jean, Villaver, Eva, White, Glenn J., and Zinnecker, Hans

Subjects
Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

(abridged) A complete census of planetary systems around a volume-limited sample of solar-type stars (FGK dwarfs) in the Solar neighborhood with uniform sensitivity down to Earth-mass planets within their Habitable Zones out to several AUs would be a major milestone in extrasolar planets astrophysics. This fundamental goal can be achieved with a mission concept such as NEAT - the Nearby Earth Astrometric Telescope. NEAT is designed to carry out space-borne extremely-high-precision astrometric measurements sufficient to detect dynamical effects due to orbiting planets of mass even lower than Earth's around the nearest stars. Such a survey mission would provide the actual planetary masses and the full orbital geometry for all the components of the detected planetary systems down to the Earth-mass limit. The NEAT performance limits can be achieved by carrying out differential astrometry between the targets and a set of suitable reference stars in the field. The NEAT instrument design consists of an off-axis parabola single-mirror telescope, a detector with a large field of view made of small movable CCDs located around a fixed central CCD, and an interferometric calibration system originating from metrology fibers located at the primary mirror. The proposed mission architecture relies on the use of two satellites operating at L2 for 5 years, flying in formation and offering a capability of more than 20,000 reconfigurations (alternative option uses deployable boom). The NEAT primary science program will encompass an astrometric survey of our 200 closest F-, G- and K-type stellar neighbors, with an average of 50 visits. The remaining time might be allocated to improve the characterization of the architecture of selected planetary systems around nearby targets of specific interest (low-mass stars, young stars, etc.) discovered by Gaia, ground-based high-precision radial-velocity surveys., Comment: Accepted for publication in Experimental Astronomy. The full member list of the NEAT proposal and the news about the project are available at http://neat.obs.ujf-grenoble.fr. The final publication is available at http://www.springerlink.com

Published
2011
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5. Building the 'JMMC Stellar Diameters Catalog' using SearchCal

Author

Lafrasse, Sylvain, Mella, Guillaume, Bonneau, Daniel, Duvert, Gilles, Delfosse, Xavier, Chesneau, Olivier, and Chelli, Alain

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The JMMC Calibrator Workgroup has long developed methods to ascertain the angular diameter of stars, and provides this expertise in the SearchCal software. SearchCal dynamically finds calibrators near science objects by querying CDS hosted catalogs according to observational parameters. Initially limited to bright objects (K magnitude

Published
2010
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6. The third version of the AMBER data reduction software

Author

Malbet, Fabien, Duvert, Gilles, Millour, Florentin, Bouquin, Jean-Baptiste Le, Mella, Guillaume, Halipré, Luc, Chelli, Alain, Lafrasse, Sylvain, Altariba, Evelyne, and Zins, Gérard

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We present the third release of the AMBER data reduction software by the JMMC. This software is based on core algorithms optimized after several years of operation. An optional graphic interface in a high level language allows the user to control the process step by step or in a completely automatic manner. Ongoing improvement is the implementation of a robust calibration scheme, making use of the full calibration sets available during the night. The output products are standard OI-FITS files, which can be used directly in high level software like model fitting or image reconstruction tools. The software performances are illustrated on a full data set of calibrators observed with AMBER during 5 years taken in various instrumental setup., Comment: To be published in the proceedings of the SPIE'2010 conference on "Optical and Infrared Interferometry II"

Published
2010
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7. Phase Closure Nulling: results from the 2009 campaign

Author

Duvert, Gilles, Malbet, Fabien, Chelli, Alain, Millan-Gabet, Rafael, Monnier, John D., and Schaefer, Gail H.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We present here a new observational technique, Phase Closure Nulling (PCN), which has the potential to obtain very high contrast detection and spectroscopy of faint companions to bright stars. PCN consists in measuring closure phases of fully resolved objects with a baseline triplet where one of the baselines crosses a null of the object visibility function. For scenes dominated by the presence of a stellar disk, the correlated flux of the star around nulls is essentially canceled out, and in these regions the signature of fainter, unresolved, scene object(s) dominates the imaginary part of the visibility in particular the closure phase. We present here the basics of the PCN method, the initial proof-of-concept observation, the envisioned science cases and report about the first observing campaign made on VLTI/AMBER and CHARA/MIRC using this technique., Comment: To be published in the proceedings of the SPIE'2010 conference on "Optical and Infrared Interferometry II"

Published
2010
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8. Imaging Earth-like planets with Extremely Large Telescopes

Author

Chelli, Alain

Subjects
Astrophysics
Abstract

We investigate the possiblity to detect Earth-like planets, in the visible and the near infrared domains, with ground based Extremely Large Telescopes equipped with adaptive systems capable of providing high Strehl ratios. From a detailed analysis of the speckle noise, we derive analytical expressions of the signal to noise ratio on the planet flux, for direct and differential imaging, in the presence of the speckle noise and the photon noise of the residual stellar halo. We find that a 100m telescope would detect an Earth at a distance of 10pc, with a signal to noise ratio of 5, in an integration time of 12 hours. This requires to control the instrumental aberrations with a precision better than 1 nanometer rms, and to reach an image dynamics of $1.2{\rm x}10^{6}$ at $0\farcs 1$ radius. Under the same conditions, a telescope of 30m would require a dynamics of $1.3{\rm x}10^{7}$ for a positive detection, Comment: Accepted in Astronomy & Astrophysics

Published
2005
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9. High precision astrometry mission for the detection and characterization of nearby habitable planetary systems with the Nearby Earth Astrometric Telescope (NEAT)

Author

Malbet, Fabien, Léger, Alain, Shao, Michael, Goullioud, Renaud, Lagage, Pierre-Olivier, Brown, Anthony G. A., Cara, Christophe, Durand, Gilles, Eiroa, Carlos, Feautrier, Philippe, Jakobsson, Björn, Hinglais, Emmanuel, Kaltenegger, Lisa, Labadie, Lucas, Lagrange, Anne-Marie, Laskar, Jacques, Liseau, René, Lunine, Jonathan, Maldonado, Jesús, Mercier, Manuel, Mordasini, Christoph, Queloz, Didier, Quirrenbach, Andreas, Sozzetti, Alessandro, Traub, Wesley, Absil, Olivier, Alibert, Yann, Andrei, Alexandre Humberto, Arenou, Frédéric, Beichman, Charles, Chelli, Alain, Cockell, Charles S., Duvert, Gilles, Forveille, Thierry, Garcia, Paulo J. V., Hobbs, David, Krone-Martins, Alberto, Lammer, Helmut, Meunier, Nadège, Minardi, Stefano, Moitinho de Almeida, André, Rambaux, Nicolas, Raymond, Sean, Röttgering, Huub J. A., Sahlmann, Johannes, Schuller, Peter A., Ségransan, Damien, Selsis, Franck, Surdej, Jean, Villaver, Eva, White, Glenn J., and Zinnecker, Hans

Published
2012
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10. Darwin—an experimental astronomy mission to search for extrasolar planets

Author

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

Published
2009
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11. Commissioning MATISSE: operation and performances

Author

Petrov, Romain G., primary, Allouche, Fatmé, additional, Matter, Alexis, additional, Meilland, Anthony, additional, Lagarde, Stéphane, additional, Bério, Philippe, additional, Cruzalèbes, Pierre, additional, Millour, Florentin, additional, Robbe-Dubois, Sylvie, additional, Jaffe, Walter J., additional, Hofmann, Karl-Heinz, additional, Varga, Jozsef, additional, Schertl, Dieter, additional, Burtscher, Leonard, additional, Meisenheimer, Klaus, additional, Chelli, Alain E., additional, Zins, Gerard, additional, Woillez, Julien, additional, Schöller, Markus, additional, and Lopez, Bruno, additional

Published
2020
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12. AMBER: a near infrared focal instrument for the VLTI

Author

Petrov, Romain G., Malbet, Fabien, Richichi, Andrea, Hofmann, Karl-Heinz, Mourard, Denis, Agabi, Karim, Antonelli, Pierre, Aristidi, Eric, Baffa, Carlo, Beckmann, Udo, Berio, Philippe, Bresson, Yves, Cassaing, Frederic, Chelli, Alain, Dreiss, Albrecht, Dugué, Michel, Duvert, Gilles, Forveille, Thierry, Gennari, Sandro, Geng, Michael, Glentzlin, André, Kamm, Daniel, Lagarde, Stéphane, LeCoarer, Etienne, LeContel, Danielle, Lisi, Franco, Lopez, Bruno, Marconi, Alessandro, Mars, Gilbert, Martinot-Lagarde, Grégoire, Mekarnia, Djamel, Monin, Jean-Louis, Mouillet, David, Puget, Pascal, Rabbia, Yves, Rebattu, Sylvestre, Reynaud, François, Robbe-Dubois, Sylvie, Rousselet-Perraut, Karine, Sacchettini, Michel, Salinari, Piero, Schoeller, Markus, Tallon-Bosc, Isabelle, Vannier, Martin, and Weigelt, Gerd

Published
2001
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13. MATISSE: Performance in laboratory, results of AIV in Paranal, and first results on sky

Author

Lagarde, Stéphane, primary, Robbe-Dubois, Sylvie, primary, Allouche, Fatmé, primary, Berio, Philippe, primary, Lopez, Bruno, primary, Petrov, Romain, primary, Millour, Florentin, primary, Matter, Alexis, primary, Cruzalèbes, Pierre, primary, Antonelli, Pierre, primary, Bailet, Christophe, primary, Bresson, Yves, primary, Clausse, Jean-Michel, primary, Fantei-Caujolle, Yan, primary, Marcotto, Aurélie, primary, Meilland, Anthony, primary, Morel, Sebastien, primary, Rousseau, Sylvain, primary, Soulain, Anthony, primary, Zins, Gérard, primary, Laun, Werner, primary, Adler, Tobias, primary, Klein, Ralf, primary, Maurer, Tobias, primary, Eldswick, Eddy, primary, Heininger, Matthias, primary, Bristow, Paul, primary, Glindemann, Andreas, primary, Hubin, Norbert, primary, Jochum, Liselotte, primary, Rivinus, Thomas, primary, Schoeller, Markus, primary, Beltran, Juan, primary, Bourget, Pierre, primary, Gallenne, Alexandre, primary, Guerlet, Thibaut, primary, Haubois, Xavier, primary, Ives, Derek, primary, Jakob, Gerd, primary, Meister, Alexander, primary, Riquelme, Miguel, primary, Schuhler, Nicolas, primary, Stephan, Christian, primary, Toledo, Pedro, primary, Tristam, Konrad, primary, Woillez, Julien, primary, Neumann, Udo, primary, Chelli, Alain, primary, Guitton, Florence, primary, Meisenheimer, Klaus, primary, Pichon, Bernard, primary, Spang, Alain, primary, Varga, Jozsef, primary, Henning, Thomas, primary, Jaffe, Walter, primary, Pasquini, Luca, primary, Stee, Philippe, primary, Weigelt, Gerd, primary, Bettonvil, Felix, primary, Lehmitz, Michael, primary, and Beckmann, Udo, primary

Published
2018
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14. Commissioning MATISSE: first results

Author

Cruzalèbes, Pierre, primary, Lagarde, Stéphane, primary, Robbe-Dubois, Sylvie, primary, Lopez, Bruno, primary, Berio, Philippe, primary, Millour, Florentin, primary, Allouche, Fatmé, primary, Fanteï-Caujolle, Yan, primary, Petrov, Romain, primary, Jaffe, Walter, primary, Matter, Alexis, primary, Meilland, Anthony, primary, Morel, Sebastien, primary, Paladini, Claudia, primary, Rivinius, Thomas, primary, Rousseau, Sylvain, primary, Varga, Jozsef, primary, Zins, Gérard, primary, Chelli, Alain, primary, Glidemann, Andreas, primary, and Schöller, Markus, primary

Published
2018
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16. Commissioning MATISSE: operation and performances

Author

Tuthill, Peter G., Mérand, Antoine, Sallum, Stephanie, Petrov, Romain G., Allouche, Fatmé, Matter, Alexis, Meilland, Anthony, Lagarde, Stéphane, Berio, Philippe, Cruzalèbes, Pierre, Millour, Florentin, Robbe-Dubois, Sylvie, Jaffe, Walter, Hofmann, Karl-Heinz, Varga, Jozsef, Schertl, Dieter, Burtscher, Leonard, Meisenheimer, Klaus, Chelli, Alain, Zins, Gerard, Woillez, Julien, Schöller, Markus, and Lopez, Bruno

Published
2020
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17. Commissioning MATISSE: first results.

Author

Petrov, Romain G., Allouche, Fatmé, Berio, Philippe, Chelli, Alain, Cruzalèbes, Pierre, Fanteï, Yan, Jaffe, Walter, Glindemann, Andreas, Lagarde, Stéphane, Lopez, Bruno, Matter, Alexis, Meilland, Antony, Millour, Florentin, Morel, Sebastien, Paladini, Claudia, Rivinius, Thomas, Robbe-Dubois, Sylvie, Rousseau, Sylvain, Schöller, Markus, and Varga, Jozsef

Published
2018
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20. Multiple-beam Fringe Tracking for the VLTI

Author

Cassaing, Frédéric, Baron, Fabien, Mocoeur, Isabelle, Mugnier, Laurent M., Rousset, Gérard, Sorrente, Béatrice, Delplancke, Francoise, Paresce, Francesco, Chelli, Alain 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 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
Interferometry, Optics, Computer science, business.industry, Phase diversity, Multiple beam, Piston (optics), [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Phase retrieval, business, Tracking (particle physics), Deformable mirror
Abstract

The performance of interferometric instruments is strongly linked to the quality of piston stabilization. Next generation VLTI instruments plan to use 4to8 beams simultaneously. In the current VLTI implementation, the maximum number of beams that can be phased using FINITO and PRIMA/FSU simultaneously is5. Therefore, a new fringe sensor is required for the VLTI.

Published
2007

21. Scientific Prospects for VLTI in the Galactic Centre: Getting to the Schwarzschild Radius

Author

Paumard, Thibaut, Perrin, Guy, Eckart, Andreas, Genzel, Reinhard, Léna, Pierre, Schödel, Rainer, Eisenhauer, Frank, Müller, Thomas G., Gillessen, S., Delplancke, Francoise, Paresce, Francesco, Chelli, Alain 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 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
Physics, Proper motion, Astrophysics::High Energy Astrophysical Phenomena, Astronomy, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Galaxy, Black hole, Star cluster, Binary black hole, Intermediate-mass black hole, Stellar black hole, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Schwarzschild radius, Astrophysics::Galaxy Astrophysics
Abstract

The centre of our Galaxy is by far the closest galactic nucleus to theEarth. Not surprisingly, Sgr A*, the super-massive black hole candidate lyingat its gravitational centre, is the black hole (BH) candidate which offersthe best spatial resolution in terms of Schwarzschild radius tpRs, thanksto the good compromise between its mass (≃3.6×106 M⊙)and distance (≃8 kpc). For a 3.6×106 M⊙ BH,tpRs=14 R⊙ (≃8 umuas at 8 kpc). This is still twoorders of magnitudes smaller than the spatial resolution offered by theVLTI, but it is the right scale for studies involving only astrometry withPRIMA. We will show how this property can be used to tremendously improvethe knowledge of the central mass distribution, constrain the properties ofthe BH, and even directly probe the space-time around this object.

Published
2007

23. JMMC Model Fitting Software for optical interferometry

Author

Tallon, Michel, Tallon-Bosc, I., Thiébaut, Eric, Béchet, C., Chadid, M., Chelli, Alain E., Clausse, J.-M., Duvert, Gilles, Mourard, Denis, Perrin, Guy, Petrov, Romain G., Stee, Philippe, Zins, Gerard, 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

Published
2004

24. A global database for optical interferometry

Author

Haubois, Xavier, additional, Bernaud, Patrick, additional, Mella, Guillaume, additional, Duvert, Gilles, additional, Benisty, Myriam, additional, Bério, Philippe, additional, Bourges, Laurent, additional, Chelli, Alain E., additional, Chesneau, Olivier, additional, Lacour, Sylvestre, additional, Lafrasse, Sylvain, additional, Le Bouquin, Jean-Baptiste, additional, Mourard, Denis, additional, Nardetto, Nicolas, additional, and Olofsson, Johan, additional

Published
2014
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25. AMBER: the near-infrared focal instrument for the Very Large Telescope Interferometer

Author

Petrov, Romain G., Malbet, Fabien, Richichi, Andrea, Hofmann, Karl-Heinz, Mourard, Denis, Agabi, Karim, Antonelli, Pierre, Aristidi, Eric, Baffa, Carlo, Beckmann, Udo, Berio, Philippe, Bresson, Yves, Cassaing, Frederic, Petrov, Romain, Chelli, Alain, Dreiss, Albrecht, Dugué, Michel, Duvert, Gilles, Forveille, Thierry, Fossat, E., Gennari, Sandro, Geng, M., Glentzlin, Andre, Kamm, Daniel, Lagarde, Stéphane, Lecoarer, Etienne, LeContel, Danielle, LeContel, John Michel, Lisi, Franco, Lopez, Bruno, Mars, Gilbert, Martinot-Lagarde, Gregoire, Mékarnia, Djamel, Monin, Jean-Louis, Mouillet, David, Perrier-Bellet, Christian, Puget, Pascal, Rabbia, Yves, Rebattu, Sylvestre, Reynaud, François, Robbe-Dubois, Sylvie, Perraut-Rousselet, Karine, Sacchettini, Michel, Schoeller, Markus, Tallon-Bosc, Isabelle, Weigelt, Gerd, Laboratoire Universitaire d'Astrophysique de Nice (LUAN), Université Nice Sophia Antipolis (... - 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)-Centre National de la Recherche Scientifique (CNRS), 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), INAF - Osservatorio Astrofisico di Arcetri (OAA), Istituto Nazionale di Astrofisica (INAF), Darmstadt University of Technology [Darmstadt], Laboratoire Hippolyte Fizeau (FIZEAU), 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, 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), Joseph Louis LAGRANGE (LAGRANGE), Département Fresnel (FRESNEL), Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS), Max-Planck-Institut für Radioastronomie (MPIFR), ONERA - The French Aerospace Lab [Châtillon], ONERA-Université Paris Saclay (COmUE), Observatoire de la Côte d'Azur (OCA), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Gemini (LG), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, Géoazur (GEOAZUR 6526), Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), PHOTONIQUE, XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), European Southern Observatory (ESO), Centre de Recherche Astrophysique de Lyon (CRAL), École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), 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), Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), ONERA, Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Nice Sophia Antipolis (... - 2019) (UNS), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Université Nice Sophia Antipolis (1965 - 2019) (UNS), 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), 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), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-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), Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Nice Sophia Antipolis (1965 - 2019) (UNS), and École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL)

Subjects
Physics, Very Large Telescope, business.industry, Near-infrared spectroscopy, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, 01 natural sciences, Exoplanet, 010309 optics, Interferometry, Optics, Planet, 0103 physical sciences, Astronomical interferometer, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Adaptive optics, business, Visibility, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

International audience; AMBER is a focal instrument for the Very Large Telescope Interferometer working in the near infrared from 1.1 to 2.4 micrometers . It has been designed having in mind the General User of interferometric observations and the full range of his possible astrophysical programs. However the three programs used to define the key specifications have been the study of Young Stellar Objects, the study of Active Galactic Nuclei dust tori and broad line regions and the measure of masses and spectra of hot Extra Solar Planets. AMBER combines up to three beams produced by the VLTI 8 m Unit Telescopes equipped with Adaptive Optics and/or by the 1.8 m Auxiliary Telescopes. The fringes are dispersed with resolutions ranging from 35 to 10000. It is optimized for high accuracy single mode measurements of the absolute visibility, of the variation of the visibility and phase with wavelength (differential interferometry) and of phase closure relations with three telescopes. The instrument and its software are designed to allow a highly automated user friendly operation and an easy maintenance.

Published
2000

26. Phase Closure Nulling: results from the 2009 campaign

Author

Danchi, William C., Delplancke, Françoise, Rajagopal, Jayadev K., Duvert, Gilles, Malbet, Fabien, Chelli, Alain, Millan-Gabet, Rafael, Monnier, John D., Schaefer, Gail H., Danchi, William C., Delplancke, Françoise, Rajagopal, Jayadev K., Duvert, Gilles, Malbet, Fabien, Chelli, Alain, Millan-Gabet, Rafael, Monnier, John D., and Schaefer, Gail H.

Abstract

We present here a new observational technique, Phase Closure Nulling (PCN), which has the potential to obtain very high contrast detection and spectroscopy of faint companions to bright stars. PCN consists in measuring closure phases of fully resolved objects with a baseline triplet where one of the baselines crosses a null of the object visibility function. For scenes dominated by the presence of a stellar disk, the correlated flux of the star around nulls is essentially canceled out, and in these regions the signature of fainter, unresolved, scene object(s) dominates the imaginary part of the visibility in particular the closure phase. We present here the basics of the PCN method, the initial proof-of-concept observation, the envisioned science cases and report about the first observing campaign made on VLTI/AMBER and CHARA/MIRC using this technique.

Published
2010

27. High precision astrometry mission for the detection and characterization of nearby habitable planetary systems with the Nearby Earth Astrometric Telescope (NEAT)

Author

Malbet, Fabien, primary, Léger, Alain, additional, Shao, Michael, additional, Goullioud, Renaud, additional, Lagage, Pierre-Olivier, additional, Brown, Anthony G. A., additional, Cara, Christophe, additional, Durand, Gilles, additional, Eiroa, Carlos, additional, Feautrier, Philippe, additional, Jakobsson, Björn, additional, Hinglais, Emmanuel, additional, Kaltenegger, Lisa, additional, Labadie, Lucas, additional, Lagrange, Anne-Marie, additional, Laskar, Jacques, additional, Liseau, René, additional, Lunine, Jonathan, additional, Maldonado, Jesús, additional, Mercier, Manuel, additional, Mordasini, Christoph, additional, Queloz, Didier, additional, Quirrenbach, Andreas, additional, Sozzetti, Alessandro, additional, Traub, Wesley, additional, Absil, Olivier, additional, Alibert, Yann, additional, Andrei, Alexandre Humberto, additional, Arenou, Frédéric, additional, Beichman, Charles, additional, Chelli, Alain, additional, Cockell, Charles S., additional, Duvert, Gilles, additional, Forveille, Thierry, additional, Garcia, Paulo J. V., additional, Hobbs, David, additional, Krone-Martins, Alberto, additional, Lammer, Helmut, additional, Meunier, Nadège, additional, Minardi, Stefano, additional, Moitinho de Almeida, André, additional, Rambaux, Nicolas, additional, Raymond, Sean, additional, Röttgering, Huub J. A., additional, Sahlmann, Johannes, additional, Schuller, Peter A., additional, Ségransan, Damien, additional, Selsis, Franck, additional, Surdej, Jean, additional, Villaver, Eva, additional, White, Glenn J., additional, and Zinnecker, Hans, additional

Published
2011
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28. The third version of the AMBER data reduction software

Author

Malbet, Fabien, primary, Duvert, Gilles, additional, Millour, Florentin A., additional, Le Bouquin, Jean-Baptiste, additional, Mella, Guillaume, additional, Halipré, Luc, additional, Chelli, Alain, additional, Lafrasse, Sylvain, additional, Altariba, Evelyne, additional, and Zins, Gérard, additional

Published
2010
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31. 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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32. Data reduction for the AMBER instrument

Author

Millour, Florentin, primary, Tatulli, Eric, additional, Chelli, Alain E., additional, Duvert, Gilles, additional, Zins, Gerard, additional, Acke, B., additional, and Malbet, Fabien, additional

Published
2004
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34. Jean-Marie Mariotti Center for Interferometry

Author

Chelli, Alain, primary, Duvert, Gilles, additional, Bonneau, Daniel, additional, Perrin, Guy S., additional, Thiebaut, Eric M., additional, Mourard, Denis, additional, Petrov, Romain G., additional, Cruzalebes, Pierre, additional, Lopez, Bruno, additional, Malbet, Fabien, additional, Daigne, Gerard, additional, and Ollivier, Marc, additional

Published
2003
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36. Using the near infrared VLTI instrument AMBER

Author

Petrov, Romain G., primary, Malbet, Fabien, additional, Weigelt, Gerd, additional, Lisi, Franco, additional, Puget, Pascal, additional, Antonelli, Pierre, additional, Beckmann, Udo, additional, Lagarde, Stephane, additional, Lecoarer, Etienne, additional, Robbe-Dubois, Sylvie, additional, Duvert, Gilles, additional, Gennari, Sandro, additional, Chelli, Alain, additional, Dugue, Michel, additional, Rousselet-Perraut, Karine, additional, Vannier, Martin, additional, and Mourard, Denis, additional

Published
2003
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44. AMBER: the near-infrared focal instrument for the Very Large Telescope Interferometer

Author

Petrov, Romain G., primary, Malbet, Fabien, additional, Richichi, Andrea, additional, Hofmann, Karl-Heinz, additional, Mourard, Denis, additional, Agabi, Karim, additional, Antonelli, Pierre, additional, Aristidi, Eric, additional, Baffa, Carlo, additional, Beckmann, Udo, additional, Berio, Philippe, additional, Bresson, Yves, additional, Cassaing, Frederic, additional, Chelli, Alain, additional, Dreiss, Albrecht, additional, Dugue, Michel, additional, Duvert, Gilles, additional, Forveille, Thierry, additional, Fossat, E., additional, Gennari, Sandro, additional, Geng, M., additional, Glentzlin, Andre, additional, Kamm, Daniel, additional, Lagarde, Stephane, additional, LeCoarer, Etienne, additional, LeContel, Danielle, additional, LeContel, John Michel, additional, Lisi, Franco, additional, Lopez, Bruno, additional, Mars, Gilbert, additional, Martinot-Lagarde, Gregoire, additional, Mekarnia, Djamel, additional, Monin, Jean-Louis, additional, Mouillet, David, additional, Perrier-Bellet, Christian, additional, Puget, Pascal, additional, Rabbia, Yves, additional, Rebattu, Sylvestre, additional, Reynaud, Francois, additional, Robbe-Dubois, Sylvie, additional, Perraut-Rousselet, Karine, additional, Sacchettini, Michel, additional, Schoeller, Markus, additional, Tallon-Bosc, Isabelle, additional, and Weigelt, Gerd, additional

Published
2000
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49. Angular dimensions of accreting young stars

Author

CHELLI, ALAIN, LÉNA, PIERRE, and SIBILLE, FRANÇOIS

Abstract

ALTHOUGH every star passes through a pre-main sequence stage during its formation, only a few astronomical objects have been considered as likely candidates for the early protostellar evolutionary stage1. The bulk of the energy observed as radiation emitted by a compact source in the near IR, from 2 to 10 µm, is attributed to thermal emission from a dust shell, where the opacity is a rapidly varying function of the wavelength. To study radiative transfer models, the knowledge of the spatial intensity distribution on the object surface in the near IR is crucial. We have developed a method of IR speckle inter-ferometry2which allows the spatial spectrum of an object in a given direction in the modulus sense to be determined up to the frequency cut-off of the telescope. As usual in speckle interferometry techniques the phase is lost unless sophisticated phase-restoration techniques are used. We applied this method to several protostellar candidates: the BN object, W3IRS5, R MonIRS3, CRL2591 and S140IR at wavelengths 4.8 and 3.5 µm. We present here the results of dealing with BN and W3IRS5, and a more detailed interpretation of the whole set will be given elsewhere.

Published
1979
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