New inverse method for circumstellar environments reconstruction in polarimetry with the ESO/VLT-SPHERE IRDIS instrument

Laurence Denneulin; Maud Langlois; Éric Thiébaut

doi:10.1117/12.2313901

8 July 2018 New inverse method for circumstellar environments reconstruction in polarimetry with the ESO/VLT-SPHERE IRDIS instrument

Laurence Denneulin, Maud Langlois, Éric Thiébaut

Author Affiliations +

Proceedings Volume 10702, Ground-based and Airborne Instrumentation for Astronomy VII; 1070245 (2018) https://doi.org/10.1117/12.2313901
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

The instrument IRDIS on ESO/VLT-SPHERE allows for observations in polarimetry of circumstellar disks in the near infrared. Since circumstellar disks light is partially linearly polarized by the reflection of the star light on its surface, the DPI mode (Dual Polarimetry Imaging) allows us to recover the intensity and the angle of polarization leading to morphology and dust size studies of these disks. We have developed a new method to reduce the IRDIS-DPI data based on an inverse approach method. This method is based on an optimization using the electric field (Jones Matrices) rather than the intensity (Mueller matrices) and relies on the inverse approach (i.e. fitting a model of the data to the observed dataset) which is significantly less biased and more efficient at minimizing instrumental artefacts. We describe, in this paper, this new method and we compare it to the state of the art methods. Using two IRDIS-DPI datasets we also demonstrate its ability to reconstruct polarized intensities maps and the angle of polarization.

Citation Download Citation

Laurence Denneulin, Maud Langlois, and Éric Thiébaut "New inverse method for circumstellar environments reconstruction in polarimetry with the ESO/VLT-SPHERE IRDIS instrument", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 1070245 (8 July 2018); https://doi.org/10.1117/12.2313901

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