Dr. Alice Zurlo Profile

Dr. Alice Zurlo

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Publications (8)

Proceedings Article | 12 September 2017 Presentation + Paper

Combining angular differential imaging and accurate polarimetry with SPHERE/IRDIS to characterize young giant exoplanets

Rob van Holstein, Frans Snik, Julien Girard, Jozua de Boer, C. Ginski, Christoph Keller, Daphne Stam, Jean-Luc Beuzit, David Mouillet, Markus Kasper, Maud Langlois, Alice Zurlo, Remco de Kok, Arthur Vigan

Proceedings Volume 10400, 1040015 (2017) https://doi.org/10.1117/12.2272554

KEYWORDS: Polarization, Polarimetry, Planets, Signal detection, Principal component analysis, Exoplanets, Telescopes, Stars, Solids, Speckle

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Young giant exoplanets emit infrared radiation that can be linearly polarized up to several percent. This linear polarization can trace: 1) the presence of atmospheric cloud and haze layers, 2) spatial structure, e.g. cloud bands and rotational flattening, 3) the spin axis orientation and 4) particle sizes and cloud top pressure. We introduce a novel high-contrast imaging scheme that combines angular differential imaging (ADI) and accurate near-infrared polarimetry to characterize self-luminous giant exoplanets. We implemented this technique at VLT/SPHEREIRDIS and developed the corresponding observing strategies, the polarization calibration and the data-reduction approaches. The combination of ADI and polarimetry is challenging, because the field rotation required for ADI negatively affects the polarimetric performance. By combining ADI and polarimetry we can characterize planets that can be directly imaged with a very high signal-to-noise ratio. We use the IRDIS pupil-tracking mode and combine ADI and principal component analysis to reduce speckle noise. We take advantage of IRDIS’ dual-beam polarimetric mode to eliminate differential effects that severely limit the polarimetric sensitivity (flat-fielding errors, differential aberrations and seeing), and thus further suppress speckle noise. To correct for instrumental polarization effects, we apply a detailed Mueller matrix model that describes the telescope and instrument and that has an absolute polarimetric accuracy ≤ 0.1%. Using this technique we have observed the planets of HR 8799 and the (sub-stellar) companion PZ Tel B. Unfortunately, we do not detect a polarization signal in a first analysis. We estimate preliminary 1σ upper limits on the degree of linear polarization of ∼ 1% and ∼ 0.1% for the planets of HR 8799 and PZ Tel B, respectively. The achieved sub-percent sensitivity and accuracy show that our technique has great promise for characterizing exoplanets through direct-imaging polarimetry

Proceedings Article | 9 August 2016 Paper

Pushing down with the contrast: scientific performances with SPHERE-IFS

R. Claudi, J. Antichi, A. Baruffolo, P. Bruno, E. Cascone, V. DeCaprio, M. DePascale, S. Desidera, V. D'Orazi, D. Fantinel, G. Farisato, E. Giro, R. Gratton, L. Lessio, A.L. Maire, D. Mesa, B. Salasnich, S. Scuderi, E. Sissa, M. Turatto, A. Zurlo, JL Beuzit, A. Boccaletti, G. Chauvin, K. Dohlen, G. Finger, J. Girard, M. Kasper, N. Hubin, M. Langlois, J. L. Lizon, D. Mouillet, P. Puget, F. Wildi

Proceedings Volume 9908, 99083H (2016) https://doi.org/10.1117/12.2232827

KEYWORDS: Iterated function systems, Optical spheres, Imaging systems, Exoplanets, Stars, Polarization, Visible radiation, Iterated function systems, Optical spheres, Principal component analysis, Coronagraphy, Planets

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Proceedings Article | 6 August 2014 Paper

Methods for the detection and the characterization of low mass companions using the IFS of SPHERE

A. Zurlo, D. Mesa, R. Gratton, R. Claudi, S. Desidera, E. Giro, J.-L. Beuzit, K. Dohlen, D. Mouillet, P. Puget, F. Wildi, M. Feldt, O. Moeller-Nilsson, A. Baruffolo, D. Fantinel, B. Salasnich, M. Kasper, A. Costille, J.-F. Sauvage, A. Vigan, C. Moutou, M. Langlois, J. Antichi, A. Pavlov, N. Zimmerman, M. Turatto

Proceedings Volume 9147, 914770 (2014) https://doi.org/10.1117/12.2055085

KEYWORDS: Planets, Iterated function systems, Stars, Principal component analysis, Optical spheres, Photometry, Point spread functions, Speckle pattern, Device simulation, Telescopes

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Proceedings Article | 28 July 2014 Paper

Infrared differential imager and spectrograph for SPHERE: performance assessment for on-sky operation

Maud Langlois, Arthur Vigan, Kjetil Dohlen, Claire Moutou, Jean-Luc Beuzit, A. Boccaletti, Michael Carle, Anne Costille, R. Dorn, Laurence Gluck, C. Gry, N. Hubin, M. Feldt, M. Kasper, Fabrice Madec, David Le Mignant, J.-L. Lizon, David Mouillet, A. Origné, P. Puget, Jean-François Sauvage, F. Wildi, A. Zurlo

Proceedings Volume 9147, 91479P (2014) https://doi.org/10.1117/12.2055535

KEYWORDS: Optical spheres, Stars, Imaging spectroscopy, Adaptive optics, Calibration, Image filtering, Point spread functions, Imaging systems, Telescopes, Infrared imaging

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Proceedings Article | 24 July 2014 Paper

SPHERE/IRDIS: final performance assessment of the dual-band imaging and long slit spectroscopy modes

A. Vigan, M. Langlois, K. Dohlen, A. Zurlo, C. Moutou, A. Costille, C. Gry, F. Madec, D. Le Mignant, Laurence Gluck, J.-F. Sauvage

Proceedings Volume 9147, 91474T (2014) https://doi.org/10.1117/12.2055374

KEYWORDS: Coronagraphy, Planets, Point spread functions, Optical spheres, Imaging spectroscopy, Device simulation, Stars, Telescopes, Spectroscopy, Data acquisition

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Proceedings Article | 8 July 2014 Paper

The SPHERE IFS at work

R. Claudi, E. Giro, M. Turatto, A. Baruffolo, P. Bruno, E. Cascone, V. DeCaprio, S. Desidera, R. Dorn, D. Fantinel, G. Finger, R. Gratton, L. Lessio, J. Lizon, A. Maire, D. Mesa, B. Salasnich, S. Scuderi, A. Zurlo, K. Dohlen, J. Beuzit, D. Mouillet, P. Puget, Francois Wildi, N. Hubin, M. Kasper

Proceedings Volume 9147, 91471L (2014) https://doi.org/10.1117/12.2055087

KEYWORDS: Iterated function systems, Optical spheres, Calibration, Stars, Cameras, Sensors, Near infrared, Telescopes, Adaptive optics, Coronagraphy

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Proceedings Article | 8 July 2014 Paper

High contrast polarimetry in the infrared with SPHERE on the VLT

M. Langlois, K. Dohlen, A. Vigan, A. Zurlo, C. Moutou, H. Schmid, J. Mili, Jean-Luc Beuzit, A. Boccaletti, Michael Carle, Anne Costille, R. Dorn, L. Gluck, N. Hubin, M. Feldt, M. Kasper, L. Lizon, F. Madec, David Le Mignant, David Mouillet, J.-P. Puget, Jean-François Sauvage, F. Wildi

Proceedings Volume 9147, 91471R (2014) https://doi.org/10.1117/12.2055549

KEYWORDS: Polarimetry, Optical spheres, Polarization, Stars, Infrared imaging, Infrared radiation, Adaptive optics, Image filtering, Telescopes, Imaging systems

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Proceedings Article | 26 September 2013 Paper

Sphere: complete laboratory performance and prediction for on-sky first light

Jean-François Sauvage, Jean-Luc Beuzit, Ronald Roelfsema, Markus Feldt, Kjetil Dohlen, David Mouillet, Pascal Puget, Francois Wildi, Lyu Abe, Andrea Baruffolo, Pierre Baudoz, Andreas Bazzon, Anthony Boccaletti, Tristan Buey, Marcel Carbillet, Julien Charton, Riccardo Claudi, Anne Costille, Alain Delboulbé, Silvano Desidera, Carsten Dominik, Mark Downing, Christophe Fabron, Philippe Feautrier, Enrico Fedrigo, Thierry Fusco, Enrico Giro, Laurence Gluck, Raffaele Gratton, Thomas Henning, Norbert Hubin, Markus Kasper, Anne-Marie Lagrange, Maud Langlois, David Le Mignant, Jean-Louis Lizon, Fabrice Madec, Yves Magnard, Patrice Martinez, Dino Mesa, Ole Möller-Nilsson, Thibaut Moulin, Claire Moutou, Alexey Pavlov, Denis Perret, Cyril Petit, Johan Pragt, Patrick Rabou, Sylvain Rochat, Bernardo Salasnich, Gérard Rousset, Hans-Martin Schmid, Arnaud Sevin, Christian Soenke, Eric Stadler, Marcos Suarez, Massimo Turatto, Stéphane Udry, Arthur Vigan, Farrokh Vakili, Gérard Zins, Alice Zurlo

Proceedings Volume 8864, 88640B (2013) https://doi.org/10.1117/12.2025562

KEYWORDS: Optical spheres, Coronagraphy, Turbulence, Exoplanets, Stars, Planets, Iterated function systems, Adaptive optics, Visible radiation, Polarimetry

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Showing 5 of 8 publications

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