Search

Your search keyword '"Pragt, Johan H."' showing total 10 results
Start Over Author "Pragt, Johan H."
10 results on '"Pragt, Johan H."'

2. 4MOST : the 4-metre Multi-Object Spectroscopic Telescope project at preliminary design review

Author

de Jong, Roelof S., Barden, Samuel C., Bellido-Tirado, Olga, Brynnel, Joar G., Frey, Steffen, Giannone, Domenico, Haynes, Roger, Johl, Diana, Phillips, Daniel, Schnurr, Olivier, Walcher, Jakob C., Winkler, Roland, Ansorge, Wolfgang R., Feltzing, Sofia, McMahon, Richard G., Baker, Gabriella, Caillier, Patrick, Dwelly, Tom, Gaessler, Wolfgang, Iwer, Olaf, Mandel, Holger G., Piskunov, Nikolai, Pragt, Johan H., Walton, Nicholas A., Bensby, Thomas, Bergemann, Maria, Chiappini, Cristina, Christlieb, Norbert, Cioni, Maria-Rosa L., Driver, Simon, Finoguenov, Alexis, Helmi, Amina, Irwin, Michael J., Kitaur, Francisco-Shu, Kneib, Jean-Paul, Liske, Jochen, Merloni, Andrea, Minchev, Ivan, Richard, Johan, Starkenburg, Else, de Jong, Roelof S., Barden, Samuel C., Bellido-Tirado, Olga, Brynnel, Joar G., Frey, Steffen, Giannone, Domenico, Haynes, Roger, Johl, Diana, Phillips, Daniel, Schnurr, Olivier, Walcher, Jakob C., Winkler, Roland, Ansorge, Wolfgang R., Feltzing, Sofia, McMahon, Richard G., Baker, Gabriella, Caillier, Patrick, Dwelly, Tom, Gaessler, Wolfgang, Iwer, Olaf, Mandel, Holger G., Piskunov, Nikolai, Pragt, Johan H., Walton, Nicholas A., Bensby, Thomas, Bergemann, Maria, Chiappini, Cristina, Christlieb, Norbert, Cioni, Maria-Rosa L., Driver, Simon, Finoguenov, Alexis, Helmi, Amina, Irwin, Michael J., Kitaur, Francisco-Shu, Kneib, Jean-Paul, Liske, Jochen, Merloni, Andrea, Minchev, Ivan, Richard, Johan, and Starkenburg, Else

Abstract

We present an overview of the 4MOST project at the Preliminary Design Review. 4MOST is a major new wide-field, high-multiplex spectroscopic survey facility under development for the VISTA telescope of ESO. 4MOST has a broad range of science goals ranging from Galactic Archaeology and stellar physics to the high-energy physics, galaxy evolution, and cosmology. Starting in 2021, 4MOST will deploy 2436 fibres in a 4.1 square degree field-of-view using a positioner based on the tilting spine principle. The fibres will feed one high-resolution (R similar to 20,000) and two medium-resolution (R similar to 5000) spectrographs with fixed 3-channel designs and identical 6k x 6k CCD detectors. 4MOST will have a unique operations concept in which 5-year public surveys from both the consortium and the ESO community will be combined and observed in parallel during each exposure. The 4MOST Facility Simulator (4FS) was developed to demonstrate the feasibility of this observing concept, showing that we can expect to observe more than 25 million objects in each 5-year survey period and will eventually be used to plan and conduct the actual survey.

Published
2016
Full Text
View/download PDF

3. 4MOST: the 4-metre Multi-Object Spectroscopic Telescope project at preliminary design review

Author

de Jong, Roelof S., additional, Barden, Samuel C., additional, Bellido-Tirado, Olga, additional, Brynnel, Joar G., additional, Frey, Steffen, additional, Giannone, Domenico, additional, Haynes, Roger, additional, Johl, Diana, additional, Phillips, Daniel, additional, Schnurr, Olivier, additional, Walcher, Jakob C., additional, Winkler, Roland, additional, Ansorge, Wolfgang R., additional, Feltzing, Sofia, additional, McMahon, Richard G., additional, Baker, Gabriella, additional, Caillier, Patrick, additional, Dwelly, Tom, additional, Gaessler, Wolfgang, additional, Iwert, Olaf, additional, Mandel, Holger G., additional, Piskunov, Nikolai A., additional, Pragt, Johan H., additional, Walton, Nicholas A., additional, Bensby, Thomas, additional, Bergemann, Maria, additional, Chiappini, Cristina, additional, Christlieb, Norbert, additional, Cioni, Maria-Rosa L., additional, Driver, Simon, additional, Finoguenov, Alexis, additional, Helmi, Amina, additional, Irwin, Michael J., additional, Kitaura, Francisco-Shu, additional, Kneib, Jean-Paul, additional, Liske, Jochen, additional, Merloni, Andrea, additional, Minchev, Ivan, additional, Richard, Johan, additional, and Starkenburg, Else, additional

Published
2016
Full Text
View/download PDF

4. First results of tests on the WEAVE fibres

Author

Sayède, Frédéric, additional, Younes, Youssef, additional, Fasola, Gilles, additional, Dorent, Stéphane, additional, Abrams, Don Carlos, additional, L. Aguerri, J. Alphonso, additional, Bonifacio, Piercarlo, additional, Carrasco, Esperanza, additional, Dalton, Gavin, additional, Dee, Kevin, additional, Laporte, Philippe, additional, Lewis, Ian, additional, Lhome, Emilie, additional, Middleton, Kevin, additional, Pragt, Johan H., additional, Rey, Juerg, additional, Stuik, Remko, additional, Trager, Scott C., additional, and Vallenari, Antonella, additional

Published
2016
Full Text
View/download PDF

5. Direct Detection of Giant Extrasolar Planets with SPHERE on the VLT

Author

Beuzit, Jean-Luc, Boccaletti, Anthony, Feldt, M., Dohlen, Kjetil, Mouillet, David, Puget, Pascal, Wildi, François, Abe, Lyu, Antichi, Jacopo, Baruffolo, Andrea, Baudoz, Pierre, Carbillet, Marcel, Charton, J., Claudi, Riccardo U., Desidera, Silvano, Downing, Mark, Fabron, Christophe, Feautrier, P., Fedrigo, Enrico, Fusco, Thierry, Gach, Jean-Luc, Giro, Enrico, Gratton, R. G., Henning, Thomas, Hubin, Norbert N., Joos, F., Kasper, Markus E., Lagrange, Anne-Marie, Langlois, Maud, Lenzen, Rainer, Moutou, Claire, Pavlov, Alexey, Petit, Cyril, Pragt, Johan H., Rabou, Patrick, Rigal, Florence, Rochat, Sylvain, Roelfsema, R., Rousset, Gérard, Saisse, Michel, Schmid, Hans-Martin, Stadler, Eric, Thalmann, Christian, Turatto, Massimo, Udry, Stéphane, Vakili, Farrokh, Vigan, Arthur, Waters, Rens, Gelino, Dawn M., Ribas, Ignasi, 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
2009

7. SPHERE ZIMPOL: overview and performance simulation

Author

Thalmann, Christian, primary, Schmid, Hans M., additional, Boccaletti, Anthony, additional, Mouillet, David, additional, Dohlen, Kjetil, additional, Roelfsema, Ronald, additional, Carbillet, Marcel, additional, Gisler, Daniel, additional, Beuzit, Jean-Luc, additional, Feldt, Markus, additional, Gratton, Raffaele, additional, Joos, Franco, additional, Keller, Christoph U., additional, Kragt II, Jan, additional, Pragt, Johan H., additional, Puget, Pascal, additional, Rigal, Florence, additional, Snik, Frans, additional, Waters, Rens, additional, and Wildi, François, additional

Published
2008
Full Text
View/download PDF

8. 4MOST: the 4-metre Multi-Object Spectroscopic Telescope project at preliminary design review

Author

Evans, Christopher J., Simard, Luc, Takami, Hideki, de Jong, Roelof S., Barden, Samuel C., Bellido-Tirado, Olga, Brynnel, Joar G., Frey, Steffen, Giannone, Domenico, Haynes, Roger, Johl, Diana, Phillips, Daniel, Schnurr, Olivier, Walcher, Jakob C., Winkler, Roland, Ansorge, Wolfgang R., Feltzing, Sofia, McMahon, Richard G., Baker, Gabriella, Caillier, Patrick, Dwelly, Tom, Gaessler, Wolfgang, Iwert, Olaf, Mandel, Holger G., Piskunov, Nikolai A., Pragt, Johan H., Walton, Nicholas A., Bensby, Thomas, Bergemann, Maria, Chiappini, Cristina, Christlieb, Norbert, Cioni, Maria-Rosa L., Driver, Simon, Finoguenov, Alexis, Helmi, Amina, Irwin, Michael J., Kitaura, Francisco-Shu, Kneib, Jean-Paul, Liske, Jochen, Merloni, Andrea, Minchev, Ivan, Richard, Johan, and Starkenburg, Else

Published
2016
Full Text
View/download PDF

9. First scattered light detection of a nearly edge-on transition disk around the T Tauri star RY Lupi

Author

Langlois, Maud, Pohl, Adriana, Lagrange, Anne-Marie, Maire, Anne-Lise, Mesa, Dino, Boccaletti, Anthony, Gratton, Raffaele G., Denneulin, Laurence, Klahr, Hubert, Vigan, Arthur, Benisty, Myriam, Dominik, Carsten, Bonnefoy, Mickaël, Ménard, François, Avenhaus, Henning, Cheetham, Anthony, Van Boekel, Roy, De Boer, Jos, Chauvin, Gaël, Desidera, Silvano, Feldt, Markus, Galicher, Raphaël, Ginski, Christian, Girard, Julien H., Henning, Thomas, Janson, Markus, Kopytova, Taisiya G., Kral, Quentin, Ligi, Roxanne, Messina, Sergio, Peretti, Sébastien, Pinte, Christophe, Sissa, Elena, Stolker, Tomas, Zurlo, Alice, Magnard, Yves, Blanchard, Philippe, Buey, Tristan, Suárez Valles, Marcos, Cascone, Enrico, Möller-Nilsson, Ole, Weber, Luc, Petit, Cyril, and Pragt, Johan H.

Subjects
planet-disk interactions, techniques: polarimetric, 13. Climate action, protoplanetary disks, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, methods: observational, Astrophysics::Galaxy Astrophysics, methods: numerical
Abstract

Context. Transition disks are considered sites of ongoing planet formation, and their dust and gas distributions could be signposts of embedded planets. The transition disk around the T Tauri star RY Lup has an inner dust cavity and displays a strong silicate emission feature. Aims. Using high-resolution imaging we study the disk geometry, including non-axisymmetric features, and its surface dust grain, to gain a better understanding of the disk evolutionary process. Moreover, we search for companion candidates, possibly connected to the disk. Methods. We obtained high-contrast and high angular resolution data in the near-infrared with the VLT/SPHERE extreme adaptive optics instrument whose goal is to study the planet formation by detecting and characterizing these planets and their formation environments through direct imaging. We performed polarimetric imaging of the RY Lup disk with IRDIS (at 1.6 μm), and obtained intensity images with the IRDIS dual-band imaging camera simultaneously with the IFS spectro-imager (0.9–1.3 μm). Results. We resolved for the first time the scattered light from the nearly edge-on circumstellar disk around RY Lup, at projected separations in the 100 au range. The shape of the disk and its sharp features are clearly detectable at wavelengths ranging from 0.9 to 1.6 μm. We show that the observed morphology can be interpreted as spiral arms in the disk. This interpretation is supported by in-depth numerical simulations. We also demonstrate that these features can be produced by one planet interacting with the disk. We also detect several point sources which are classified as probable background objects., Astronomy & Astrophysics, 614, ISSN:0004-6361, ISSN:1432-0746

10. First results of tests on the WEAVE fibres

Author

Navarro, Ramón, Burge, James H., Sayède, Frédéric, Younes, Youssef, Fasola, Gilles, Dorent, Stéphane, Abrams, Don Carlos, L. Aguerri, J. Alphonso, Bonifacio, Piercarlo, Carrasco, Esperanza, Dalton, Gavin, Dee, Kevin, Laporte, Philippe, Lewis, Ian, Lhome, Emilie, Middleton, Kevin, Pragt, Johan H., Rey, Juerg, Stuik, Remko, Trager, Scott C., and Vallenari, Antonella

Published
2016
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results