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20 results on '"Traub, Wesley A."'

1. Review of small-angle coronagraphic techniques in the wake of ground-based second-generation adaptive optics systems

Author

Mawet, Dimitri, primary, Pueyo, Laurent, additional, Lawson, Peter, additional, Mugnier, Laurent, additional, Traub, Wesley, additional, Boccaletti, Anthony, additional, Trauger, John T., additional, Gladysz, Szymon, additional, Serabyn, Eugene, additional, Milli, Julien, additional, Belikov, Ruslan, additional, Kasper, Markus, additional, Baudoz, Pierre, additional, Macintosh, Bruce, additional, Marois, Christian, additional, Oppenheimer, Ben, additional, Barrett, Harrisson, additional, Beuzit, Jean-Luc, additional, Devaney, Nicolas, additional, Girard, Julien, additional, Guyon, Olivier, additional, Krist, John, additional, Mennesson, Bertrand, additional, Mouillet, David, additional, Murakami, Naoshi, additional, Poyneer, Lisa, additional, Savransky, Dmitri, additional, Vérinaud, Christophe, additional, and Wallace, James K., additional

Published
2012
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2. Coronagraphic imaging of debris disks from a high altitude balloon platform

Author

Unwin, Stephen, primary, Traub, Wesley, additional, Bryden, Geoffrey, additional, Brugarolas, Paul, additional, Chen, Pin, additional, Guyon, Olivier, additional, Hillenbrand, Lynn, additional, Krist, John, additional, Macintosh, Bruce, additional, Mawet, Dimitri, additional, Mennesson, Bertrand, additional, Moody, Dwight, additional, Roberts, Lewis C., additional, Stapelfeldt, Karl, additional, Stuchlik, David, additional, Trauger, John, additional, and Vasisht, Gautam, additional

Published
2012
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7. TPF-C: status and recent progress

Author

Traub, Wesley A., primary, Levine, Marie, additional, Shaklan, Stuart, additional, Kasting, James, additional, Angel, J. Roger, additional, Brown, Michael E., additional, Brown, Robert A., additional, Burrows, Christopher, additional, Clampin, Mark, additional, Dressler, Alan, additional, Ferguson, Henry C., additional, Hammel, Heidi B., additional, Heap, Sara R., additional, Horner, Scott D., additional, Illingworth, Garth D., additional, Kasdin, N. Jeremy, additional, Kuchner, Mark J., additional, Lin, Douglas, additional, Marley, Mark S., additional, Meadows, Victoria, additional, Noecker, Charley, additional, Oppenheimer, Ben R., additional, Seager, Sara, additional, Shao, Michael, additional, Stapelfeldt, Karl R., additional, and Trauger, John T., additional

Published
2006
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9. Fringe tracking at the IOTA interferometer

Author

Pedretti, Ettore, primary, Thureau, Nathalie D., additional, Wilson, Edward, additional, Traub, Wesley A., additional, Monnier, John D., additional, Ragland, Sam, additional, Carleton, Nathaniel P., additional, Millan-Gabet, Rafael, additional, Schloerb, F. Peter, additional, Brewer, Michael K., additional, Berger, Jean-Philippe, additional, and Lacasse, Marc G., additional

Published
2004
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12. Characterizing closure-phase measurements at IOTA

Author

Ragland, Sam, primary, Traub, Wesley A., additional, Berger, Jean-Philippe, additional, Millan-Gabet, Rafael, additional, Monnier, John D., additional, Pedretti, Ettore, additional, Schloerb, F. P., additional, Carleton, Nathaniel P., additional, Haguenauer, Pierre, additional, Kern, Pierre Y., additional, Labeye, Pierre R., additional, Lacasse, Marc G., additional, Malbet, Fabien, additional, and Rousselet-Perraut, Karine, additional

Published
2004
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17. Current status of the IOTA interferometer

Author

Carleton, Nathaniel P., primary, Traub, Wesley A., additional, Lacasse, Marc G., additional, Nisenson, Peter, additional, Pearlman, Michael R., additional, Reasenberg, Robert D., additional, Xu, Xinqi, additional, Coldwell, Charles M., additional, Panasyuk, Alexander, additional, Benson, James A., additional, Papaliolios, Costas D., additional, Predmore, Read, additional, Schloerb, F. Peter, additional, Dyck, H. M., additional, and Gibson, David M., additional

Published
1994
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18. Aperture synthesis using multiple facilities: Keck aperture masking and the IOTA interferometer

Author

Wesley A. Traub, Marc G. Lacasse, Irene L. Porro, John D. Monnier, Peter G. Tuthill, William C. Danchi, Nathaniel P. Carleton, Guy Perrin, Sebastien Morel, Vincent Coudé du Foresto, Rafael Millan-Gabet, and Traub, Wesley A.

Subjects
Masking (art), Physics, Aperture, business.industry, Aperture synthesis, Astrophysics::Instrumentation and Methods for Astrophysics, Interferometry, Optics, Closure phase, Astronomical interferometer, Spatial frequency, Focus (optics), business, Remote sensing
Abstract

As the number of optical interferometers increase, multi-facility observations become both feasible and scientifically interesting. For imaging of complex sources, the capability of increasing (u,v) coverage by using multiple arrays may be necessary for accurately interpreting the fringe visibility and closure phase data. Toward this end, coordinated observations with the IOTA interferometer and Keck aperture masking have been carried out to test techniques for synthesizing images using data from heterogeneous arrays with sparse (u,v) coverage. In particular, we will focus on how the image prior in the Maximum Entropy Method can be used to efficiently incorporate very high spatial frequency information with "low-resolution" data for imaging the generic prototype "Star + Dust Shell" image morphology. Preliminary results using real data for a few dusty evolved stars are presented.

Published
2003

19. JHK-band spectro-interferometry of T Cep with the IOTA interferometer

Author

V. Malanushenko, Michael K. Brewer, B. F. Yudin, Udo Beckmann, Dieter Schertl, John D. Monnier, Gerd Weigelt, Rafael Millan-Gabet, Jean-Philippe Berger, Michael Scholz, Ettore Pedretti, Karl-Heinz Hofmann, F. Peter Schloerb, Marc G. Lacasse, T. Bloecker, Keiichi Ohnaka, Wesley A. Traub, and Traub, Wesley A.

Subjects
Physics, Interferometry, Wavelength, Optics, business.industry, Near-infrared spectroscopy, Astronomical interferometer, Solar radius, Radius, Astrophysics, Prism, Effective temperature, business
Abstract

Our new IOTA JHK-band beam combiner allows the simultaneous recording of spectrally dispersed J-, H- and K-band Michelson interferograms. In this paper we present our IOTA observations of the Mira star T Cep with this beam combiner (observations in June 2001; four baselines in the range of 14 m to 27 m). The beam combiner optics consists of an anamorphic cylindrical lens system and a prism. From the interferograms of T Cep we derive the visibilities and the J-, H-, and K-band uniform-disk diameters of 14.0 ± 0.6 mas, 13.7 ± 0.6 mas and 15.0 ± 0.6 mas, respectively. Angular stellar filter radii and Rosseland radii are derived from the measured visibilities by fitting theoretical center-to-limb intensity variations (CLVs) of different Mira star models. The available HIPPARCOS parallax (4.76 ± 0.75 mas) of T Cep allows us to determine linear radii. For example, from the K-band visibility we derive a Rosseland radius of 329-50/+70 solar radii if we use the CLVs of the M-models as fit functions. This radius is in good agreement with the theoretical M-model Rosseland radius of 315 solar radii. The comparison of measured stellar parameters (e.g. diameters, effective temperature, visibility shape) with theoretical parameters indicates whether any of the models is a fair representation of T Cep. The ratios of visibilities of different spectral channels can be measured with higher precision than absolute visibilities. Therefore, we use the visibility ratios V(λ1)/V(λ2) to investigate the wavelength dependence of the stellar diameter. We find that the 2.03 μm uniform-disk diameter of T Cep is about 1.26 times larger than the 2.26 μm uniform-disk diameter.

Published
2003

20. SMART precision interferometry at 794 nm

Author

Ettore Pedretti, John D. Monnier, Nathaniel P. Carleton, Rafael Millan-Gabet, Charles M. Coldwell, Wesley A. Traub, Jean-Philippe Berger, C. Papaliolios, and Traub, Wesley A.

Subjects
Physics, Optical fiber, Photon, Birefringence, Spatial filter, business.industry, Astrophysics::Instrumentation and Methods for Astrophysics, Physics::Optics, Polarization (waves), law.invention, Interferometry, Optics, law, Astronomical interferometer, Calibration, business
Abstract

Single-mode fibers have been used in the near-infrared to dramatically reduce calibration error for long-baseline interferometry. We have begun an effort to apply the advantages of spatial filtering at visible wavelengths for precision measurements of pulsating Cepheids using the IOTA interferometer. Rather than employing photometric taps to calibrate fluctuating coupling efficiency, we are using an "asymmetric" coupler which allows this calibration to be done without losing photons. The Single-Mode Asymmetric Recombination Technique (SMART) experiment has finished lab-testing, and has been installed at IOTA for full commissioning in Summer 2002. We report the results of lab characterization and first sky tests, as well as first fringes on a star using a visible-wavelength single-mode coupler. With both lab and sky experience using unpolarized light, we have found that circular silica fibers are quite practical for precision interferometric measurements. We conclude that circular fibers (as opposed to polarization maintaining fibers) have an undeserved poor reputation and that birefringence effects pose no significant difficulty.

Published
2003

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