Polarimetric imaging mode of VLT/SPHERE/IRDIS: II. Characterization and correction of instrumental polarization effects,
Context. Circumstellar disks and self-luminous giant exoplanets or companion brown dwarfs can be characterized through direct-imaging polarimetry at near-infrared wavelengths. SPHERE/IRDIS at the Very Large Telescope has the capabilities to perform such measurements, but uncalibrated instrumental po...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
14 January 2020
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| In: |
Astronomy and astrophysics
Year: 2020, Jahrgang: 633, Pages: A64 |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/201834996 |
| Online-Zugang: | Verlag, Volltext: https://doi.org/10.1051/0004-6361/201834996 Verlag: https://www.aanda.org/articles/aa/abs/2020/01/aa34996-18/aa34996-18.html 
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| Verfasserangaben: | R.G. van Holstein, J.H. Girard, J. de Boer, F. Snik, J. Milli, D.M. Stam, C. Ginski, D. Mouillet, Z. Wahhaj, H.M. Schmid, C.U. Keller, M. Langlois, K. Dohlen, A. Vigan, A. Pohl, M. Carbillet, D. Fantinel, D. Maurel, A. Origné, C. Petit, J. Ramos, F. Rigal, A. Sevin, A. Boccaletti, H. Le Coroller, C. Dominik, T. Henning, E. Lagadec, F. Ménard, M. Turatto, S. Udry, G. Chauvin, M. Feldt, and J.-L. Beuzit |
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| 100 | 1 | |a Holstein, R. G. van |e VerfasserIn |0 (DE-588)1205268014 |0 (DE-627)1690825359 |4 aut | |
| 245 | 1 | 0 | |a Polarimetric imaging mode of VLT/SPHERE/IRDIS |b II. Characterization and correction of instrumental polarization effects, |c R.G. van Holstein, J.H. Girard, J. de Boer, F. Snik, J. Milli, D.M. Stam, C. Ginski, D. Mouillet, Z. Wahhaj, H.M. Schmid, C.U. Keller, M. Langlois, K. Dohlen, A. Vigan, A. Pohl, M. Carbillet, D. Fantinel, D. Maurel, A. Origné, C. Petit, J. Ramos, F. Rigal, A. Sevin, A. Boccaletti, H. Le Coroller, C. Dominik, T. Henning, E. Lagadec, F. Ménard, M. Turatto, S. Udry, G. Chauvin, M. Feldt, and J.-L. Beuzit |
| 264 | 1 | |c 14 January 2020 | |
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| 520 | |a Context. Circumstellar disks and self-luminous giant exoplanets or companion brown dwarfs can be characterized through direct-imaging polarimetry at near-infrared wavelengths. SPHERE/IRDIS at the Very Large Telescope has the capabilities to perform such measurements, but uncalibrated instrumental polarization effects limit the attainable polarimetric accuracy.<i>Aims.<i/> We aim to characterize and correct the instrumental polarization effects of the complete optical system, that is, the telescope and SPHERE/IRDIS.<i>Methods.<i/> We created a detailed Mueller matrix model in the broadband filters <i>Y, J, H,<i/> and <i>K<i/><sub><i>s<i/><sub/> and calibrated the model using measurements with SPHERE’s internal light source and observations of two unpolarized stars. We developed a data-reduction method that uses the model to correct for the instrumental polarization effects, and applied it to observations of the circumstellar disk of T Cha.<i>Results.<i/> The instrumental polarization is almost exclusively produced by the telescope and SPHERE’s first mirror and varies with telescope altitude angle. The crosstalk primarily originates from the image derotator (K-mirror). At some orientations, the derotator causes severe loss of signal (> 90% loss in the <i>H<i/>- and <i>K<i/><sub><i>s<i/><sub/>-band) and strongly offsets the angle of linear polarization. With our correction method we reach, in all filters, a total polarimetric accuracy of ≲0.1% in the degree of linear polarization and an accuracy of a few degrees in angle of linear polarization.<i>Conclusions.<i/> The correction method enables us to accurately measure the polarized intensity and angle of linear polarization of circumstellar disks, and is a vital tool for detecting spatially unresolved (inner) disks and measuring the polarization of substellar companions. We have incorporated the correction method in a highly-automated end-to-end data-reduction pipeline called IRDAP, which we made publicly available online. | ||
| 700 | 1 | |a Girard, J. H. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Boer, J. de |e VerfasserIn |4 aut | |
| 700 | 1 | |a Snik, F. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Milli, J. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Stam, D. M. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Ginski, C. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Mouillet, D. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Wahhaj, Z. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Schmid, H. M. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Keller, C. U. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Langlois, M. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Dohlen, K. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Vigan, A. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Pohl, A. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Carbillet, M. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Fantinel, D. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Maurel, D. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Origné, A. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Petit, C. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Ramos, J. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Rigal, F. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Sevin, A. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Boccaletti, A. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Coroller, H. Le |e VerfasserIn |4 aut | |
| 700 | 1 | |a Dominik, C. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Henning, Thomas |d 1956- |e VerfasserIn |0 (DE-588)124568637 |0 (DE-627)526967811 |0 (DE-576)294236120 |4 aut | |
| 700 | 1 | |a Lagadec, E. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Ménard, F. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Turatto, M. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Udry, S. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Chauvin, G. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Feldt, M. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Beuzit, J.-L. |e VerfasserIn |4 aut | |
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