Dr. Christian Ginski Profile

Dr. Christian Ginski

at Leiden Observatory

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Publications (3)

Proceedings Article | 29 August 2022 Presentation + Paper

Upgrading the high contrast imaging facility SPHERE: science drivers and instrument choices

A. Boccaletti, G. Chauvin, F. Wildi, J. Milli, E. Stadler, E. Diolaiti, R. Gratton, F. Vidal, M. Loupias, M. Langlois, F. Cantalloube, M. N’Diaye, D. Gratadour, F. Ferreira, M. Tallon, J. Mazoyer, D. Segransan, D. Mouillet, J.-L. Beuzit, M. Bonnefoy, R. Galicher, A. Vigan, I. Snellen, M. Feldt, S. Desidera, S. Rousseau, A. Baruffolo, C. Goulas, P. Baudoz, C. Bechet, M. Benisty, A. Bianco, B. Carry, E. Cascone, B. Charnay, E. Choquet, V. Christiaens, F. Cortecchia, V. Di Capprio, A. De Rosa, C. Desgrange, V. D'Orazi, S. Douté, M. Frangiamore, E. Gendron, C. Ginski, E. Huby, C. Keller, C. Kulcsár, R. Landman, S. Lagarde, E. Lagadec, A.-M. Lagrange, M. Lombini, M. Kasper, F. Ménard, Y. Magnard, G. Malaguti, D. Maurel, D. Mesa, G. Morgante, E. Pantin, T. Pichon, A. Potier, P. Rabou, S. Rochat, l. Terenzi, E. Thiébaut, I. Tallon-Bosc, H.-F Raynaud, D. Rouan, A. Sevin, F. Schiavone, L. Schrieber, A. Zanutta

Proceedings Volume 12184, 121841S (2022) https://doi.org/10.1117/12.2630154

KEYWORDS: Optical spheres, Planets, Exoplanets, Astronomy, Astrophysics, Spectral resolution, Adaptive optics, Stars, Wavefront sensors, Coronagraphy

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Proceedings Article | 29 August 2022 Poster + Paper

First on-sky results of ERIS at VLT

Kateryna Kravchenko, Yigit Dallilar, Olivier Absil, Alex Agudo Berbel, Andrea Baruffolo, Markus Bonse, Alexander Buron, Yixian Cao, Angela Cortes, Felix Dannert, Richard Davies, Robert De Rosa, Matthias Deysenroth, David Doelman, Frank Eisenhauer, Simone Esposito, Helmut Feuchtgruber, Natascha Förster Schreiber, Xiaofeng Gao, Hans Gemperlein, Reinhard Genzel, Stefan Gillessen, Christian Ginski, Adrian Glauser, Andreas Glindemann, Paolo Grani, Pierre Haguenauer, Johannes Hartwig, Jean Hayoz, Marianne Heida, Matthew Kenworthy, Johann Kolb, Harald Kuntschner, Dieter Lutz, Daizhong Liu, Mike MacIntosh, Michael Marsset, Gilles Orban de Xivry, Hakan Özdemir, Alfio Puglisi, Sascha Quanz, Christian Rau, Armando Riccardi, Daniel Schuppe, Frans Snik, Eckhard Sturm, Linda Tacconi, William Taylor, Erich Wiezorrek

Proceedings Volume 12184, 121845M (2022) https://doi.org/10.1117/12.2629258

KEYWORDS: Astronomical instrumentation, Near infrared, Sensors, Calibration, Cameras, Point spread functions, Adaptive optics, Spectral resolution, Galactic astronomy, Optical filters, Mirrors, Astronomical imaging, Astronomical instrumentation, Near infrared

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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

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