Search Results - "Gratadour, D."

Adaptive optics control with multi-agent model-free reinforcement learning by Pou, B, Ferreira, F, Quinones, E, Gratadour, D, Martin, M

“…We present a novel formulation of closed-loop adaptive optics (AO) control as a multi-agent reinforcement learning (MARL) problem in which the controller is…”
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Spatially resolved rotation of the broad-line region of a quasar at sub-parsec scale by Sturm, E, Dexter, J, Pfuhl, O, Stock, M R, Davies, R I, Lutz, D, Clénet, Y, Eckart, A, Eisenhauer, F, Genzel, R, Gratadour, D, Hönig, S F, Kishimoto, M, Lacour, S, Millour, F, Netzer, H, Perrin, G, Peterson, B M, Petrucci, P O, Rouan, D, Waisberg, I, Woillez, J, Amorim, A, Brandner, W, Schreiber, N M Förster, Garcia, P J V, Gillessen, S, Ott, T, Paumard, T, Perraut, K, Scheithauer, S, Straubmeier, C, Tacconi, L J, Widmann, F

“…The broadening of atomic emission lines by high-velocity motion of gas near accreting supermassive black holes is an observational hallmark of quasars 1 …”
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Giant Planet Imaged in the Disk of the Young Star β Pictoris by Lagrange, A.-M, Bonnefoy, M, Chauvin, G, Apai, D, Ehrenreich, D, Boccaletti, A, Gratadour, D, Rouan, D, Mouillet, D, Lacour, S, Kasper, M

“…Here, we show that the approximately 10-million-year-old β Pictoris system hosts a massive giant planet, β Pictoris b, located 8 to 15 astronomical units from…”
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Open-loop tomography with artificial neural networks on CANARY: on-sky results by Osborn, J., Guzman, D., de Cos Juez, F. J., Basden, A. G., Morris, T. J., Gendron, E., Butterley, T., Myers, R. M., Guesalaga, A., Sanchez Lasheras, F., Gomez Victoria, M., Sánchez Rodríguez, M. L., Gratadour, D., Rousset, G.

“…We present recent results from the initial testing of an artificial neural network (ANN)-based tomographic reconstructor Complex Atmospheric Reconstructor…”
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Sensitivity improvements for Shack–Hartmann wavefront sensors using total variation minimization by Basden, A. G., Morris, T. J., Gratadour, D., Gendron, E.

“…We investigate the improvements in Shack–Hartmann wavefront sensor image processing that can be realized using total variation minimization techniques to…”
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The Four‐Quadrant Phase Mask Coronagraph. IV. First Light at the Very Large Telescope by Boccaletti, A., Riaud, P., Baudoz, P., Baudrand, J., Rouan, D., Gratadour, D., Lacombe, F., Lagrange, A.‐M.

“…We present the first high‐contrast images obtained at the ESO Very Large Telescope using a four‐quadrant phase mask coronagraph. The two‐night commissioning…”
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GC-IRS13E—A Puzzling Association of Three Early-type Stars by Fritz, T. K, Gillessen, S, Dodds-Eden, K, Martins, F, Bartko, H, Genzel, R, Paumard, T, Ott, T, Pfuhl, O, Trippe, S, Eisenhauer, F, Gratadour, D

“…We present a detailed analysis of high-resolution near-infrared imaging and spectroscopy of the potential star cluster IRS13E very close to the massive black…”
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Unveiling the Central Parsec Region of an Active Galactic Nucleus: The Circinus Nucleus in the Near-Infrared with the Very Large Telescope by Prieto, M. Almudena, Meisenheimer, K, Marco, Olivier, Reunanen, Juha, Contini, Marcella, Clenet, Y, Davies, R. I, Gratadour, D, Henning, Th, Klaas, U, Kotilanien, J, Leinert, Ch, Lutz, D, Rouan, D, Thatte, N

“…VLT J- to M'-band adaptive optics observations of the Circinus galaxy on parsec scales resolve a central bright K sub(s)-band source with a FWHM size of 1.9…”
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On-sky demonstration of matched filters for wavefront measurements using ELT-scale elongated laser guide stars by Basden, A. G., Bardou, L., Calia, D. Bonaccini, Buey, T., Centrone, M., Chemla, F., Gach, J. L., Gendron, E., Gratadour, D., Guidolin, I., Jenkins, D. R., Marchetti, E., Morris, T. J., Myers, R. M., Osborn, J., Reeves, A. P., Reyes, M., Rousset, G., Stangalini, M., Townson, M. J., Vidal, F.

“…The performance of adaptive optics systems is partially dependent on the algorithms used within the real‐time control system to compute wavefront slope…”
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Gemini multiconjugate adaptive optics system review - I. Design, trade-offs and integration by Rigaut, F., Neichel, B., Boccas, M., d'Orgeville, C., Vidal, F., van Dam, M. A., Arriagada, G., Fesquet, V., Galvez, R. L., Gausachs, G., Cavedoni, C., Ebbers, A. W., Karewicz, S., James, E., Luhrs, J., Montes, V., Perez, G., Rambold, W. N., Rojas, R., Walker, S., Bec, M., Trancho, G., Sheehan, M., Irarrazaval, B., Boyer, C., Ellerbroek, B. L., Flicker, R., Gratadour, D., Garcia-Rissmann, A., Daruich, F.

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A Giant Planet Imaged in the Disk of the Young Star [beta] Pictoris by A.-M. Lagrange, Bonnefoy, M, Chauvin, G, Apai, D, Ehrenreich, D, Boccaletti, A, Gratadour, D, Rouan, D, Mouillet, D, Lacour, S, Kasper, M

“…Here, we show that the ~10-million-year-old β Pictoris system hosts a massive giant planet, β Pictoris b, located 8 to 15 astronomical units from the star…”
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VLTI/GRAVITY Interferometric Measurements of Innermost Dust Structure Sizes around AGNs by GRAVITY Collaboration, Amorim, A, Bourdarot, G, Brandner, W, Cao, Y, Clénet, Y, Davies, R, de Zeeuw, P. T, Dexter, J, Drescher, A, Eckart, A, Eisenhauer, F, Fabricius, M, Feuchtgruber, H, Schreiber, N. M. Förster, Garcia, P. J. V, Genzel, R, Gillessen, S, Gratadour, D, Hönig, S, Kishimoto, M, Lacour, S, Lutz, D, Millour, F, Netzer, H, Ott, T, Perraut, K, Perrin, G, Peterson, B. M, Petrucci, P. O, Pfuhl, O, Prieto, M. A, Rabien, S, Rouan, D, Santos, D. J, Shangguan, J, Shimizu, T, Sternberg, A, Straubmeier, C, Sturm, E, Tacconi, L. J, Tristram, K. R. W, Widmann, F, Woillez, J

“…A&A 690, A76 (2024) We present new VLTI/GRAVITY near-infrared interferometric measurements of the angular size of the innermost hot dust continuum for 14 type…”
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The size-luminosity relation of local active galactic nuclei from interferometric observations of the broad-line region by GRAVITY Collaboration, Amorim, A, Bourdarot, G, Brandner, W, Cao, Y, Clénet, Y, Davies, R, de Zeeuw, P. T, Dexter, J, Drescher, A, Eckart, A, Eisenhauer, F, Fabricius, M, Feuchtgruber, H, Schreiber, N. M. Förster, Garcia, P. J. V, Genzel, R, Gillessen, S, Gratadour, D, Hönig, S, Kishimoto, M, Lacour, S, Lutz, D, Millour, F, Netzer, H, Ott, T, Paumard, T, Perraut, K, Perrin, G, Peterson, B. M, Petrucci, P. O, Pfuhl, O, Prieto, M. A, Rabien, S, Rouan, D, Santos, D. J. D, Shangguan, J, Shimizu, T, Sternberg, A, Straubmeier, C, Sturm, E, Tacconi, L. J, Tristram, K. R. W, Widmann, F, Woillez, J

“…By using the GRAVITY instrument with the near-infrared (NIR) Very Large Telescope Interferometer (VLTI), the structure of the broad (emission-)line region…”
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High angular resolution polarimetric imaging of the nucleus of NGC 1068: Disentangling the polarising mechanisms by Grosset, L, Rouan, D, Marin, F, Gratadour, D, Lagadec, E, Hunziker, S, Montargès, M, Magnard, Y, Carle, M, Pragt, J, Petit, C

“…A&A 648, A42 (2021) Polarisation is a decisive method to study the inner region of active galactic nuclei (AGNs) since it is not affected by contrast issues…”
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Towards measuring supermassive black hole masses with interferometric observations of the dust continuum by GRAVITY Collaboration, Amorim, A, Bourdarot, G, Brandner, W, Cao, Y, Clénet, Y, Davies, R, de Zeeuw, P. T, Dexter, J, Drescher, A, Eckart, A, Eisenhauer, F, Fabricius, M, Schreiber, N. M. Förster, Garcia, P. J. V, Genzel, R, Gillessen, S, Gratadour, D, Hönig, S, Kishimoto, M, Lacour, S, Lutz, D, Millour, F, Netzer, H, Ott, T, Paumard, T, Perraut, K, Perrin, G, Peterson, B. M, Petrucci, P. O, Pfuhl, O, Prieto, M. A, Rouan, D, Santos, D. J. D, Shangguan, J, Shimizu, T, Sternberg, A, Straubmeier, C, Sturm, E, Tacconi, L. J, Tristram, K. R. W, Widmann, F, Woillez, J

“…A&A 669, A14 (2023) This work focuses on active galactic nuclei (AGNs), and the relation between the sizes of the hot dust continuum and the broad-line region…”
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Upgrading the high contrast imaging facility SPHERE: science drivers and instrument choices by Boccaletti, A, Chauvin, G, Wildi, F, Milli, J, Stadler, E, Diolaiti, E, Gratton, R, Vidal, F, Loupias, M, Langlois, M, Cantalloube, F, N'Diaye, M, Gratadour, D, Ferreira, F, Tallon, M, Mazoyer, J, Segransan, D, Mouillet, D, Beuzit, J. -L, Bonnefoy, M, Galicher, R, Vigan, A, Snellen, I, Feldt, M, Desidera, S, Rousseau, S, Baruffolo, A, Goulas, C, Baudoz, P, Bechet, C, Benisty, M, Bianco, A, Carry, B, Cascone, E, Charnay, B, Choquet, E, Christiaens, V, Cortecchia, F, de Caprio, V, De Rosa, A, Desgrange, C, D'Orazi, V, Douté, S, Frangiamore, M, Gendron, E, Ginski, C, Huby, E, Keller, C, Kulcsár, C, Landman, R, Lagarde, S, Lagadec, E, Lagrange, A. -M, Kasper, M. Lombini M, Ménard, F, Magnard, Y, Malaguti, G, Maurel, D, Mesa, D, Morgante, G, Pantin, E, Pichon, T, Potier, A, Rabou, P, Rochat, S, Terenzi, L, Thiébaut, E, Tallon-Bosc, I, Raynaud, H. -F, Rouan, D, Sevin, A, Schiavone, F, Schreiber, L, Zanutta, A

“…SPHERE+ is a proposed upgrade of the SPHERE instrument at the VLT, which is intended to boost the current performances of detection and characterization for…”
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A geometric distance to the supermassive black Hole of NGC 3783 by GRAVITY Collaboration, Amorim, A, Bauböck, M, Bentz, M. C, Brandner, W, Bolzer, M, Clénet, Y, Davies, R, de Zeeuw, P. T, Dexter, J, Drescher, A, Eckart, A, Eisenhauer, F, Schreiber, N. M. Förster, Garcia, P. J. V, Genzel, R, Gillessen, S, Gratadour, D, Hönig, S, Kaltenbrunner, D, Kishimoto, M, Lacour, S, Lutz, D, Millour, F, Netzer, H, Onken, C. A, Ott, T, Paumard, T, Perraut, K, Perrin, G, Petrucci, P. O, Pfuhl, O, Prieto, M. A, Rouan, D, Shangguan, J, Shimizu, T, Stadler, J, Sternberg, A, Straub, O, Straubmeier, C, Street, R, Sturm, E, Tacconi, L. J, Tristram, K. R. W, Vermot, P, von Fellenberg, S, Widmann, F, Woillez, J

“…A&A 654, A85 (2021) The angular size of the broad line region (BLR) of the nearby active galactic nucleus (AGN) NGC 3783 has been spatially resolved by recent…”
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ALMA images the many faces of the NGC1068 torus and its surroundings by Garcia-Burillo, S, Combes, F, Almeida, C. Ramos, Usero, A, Alonso-Herrero, A, Hunt, L. K, Rouan, D, Aalto, S, Querejeta, M, Viti, S, van der Werf, P. P, Vives-Arias, H, Fuente, A, Colina, L, Martin-Pintado, J, Henkel, C, Martin, S, Krips, M, Gratadour, D, Neri, R, Tacconi, L. J

“…A&A 632, A61 (2019) We investigate the fueling and the feedback of nuclear activity in the Seyfert 2 galaxy NGC1068, by studying the distribution and…”
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The central parsec of NGC 3783: a rotating broad emission line region, asymmetric hot dust structure, and compact coronal line region by GRAVITY Collaboration, Amorim, A, Bauböck, M, Brandner, W, Bolzer, M, Clénet, Y, Davies, R, de Zeeuw, P. T, Dexter, J, Drescher, A, Eckart, A, Eisenhauer, F, Schreiber, N. M. Förster, Gao, F, Garcia, P. J. V, Genzel, R, Gillessen, S, Gratadour, D, Hönig, S, Kaltenbrunner, D, Kishimoto, M, Lacour, S, Lutz, D, Millour, F, Netzer, H, Ott, T, Paumard, T, Perraut, K, Perrin, G, Peterson, B. M, Petrucci, P. O, Pfuhl, O, Prieto, M. A, Rouan, D, Sanchez-Bermudez, J, Shangguan, J, Shimizu, T, Schartmann, M, Stadler, J, Sternberg, A, Straub, O, Straubmeier, C, Sturm, E, Tacconi, L. J, Tristram, K. R. W, Vermot, P, von Fellenberg, S, Waisberg, I, Widmann, F, Woillez, J

“…A&A 648, A117 (2021) Using VLTI/GRAVITY and SINFONI data, we investigate the sub-pc gas and dust structure around the nearby type 1 AGN hosted by NGC 3783. The…”
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Understanding Active Galactic Nuclei using near-infrared high angular resolution polarimetry II: Preliminary results by Marin, F, Grosset, L, Goosmann, R, Gratadour, D, Rouan, D, Clénet, Y, Pelat, D, Lobos, P. Andrea Rojas

“…In this second research note of a series of two, we present the first near-infrared results we obtained when modeling Active Galactic Nuclei (AGN). Our first…”
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