مؤتمر
The expected performance of nulling at the VLTI down to 5 mas
| العنوان: | The expected performance of nulling at the VLTI down to 5 mas |
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| المؤلفون: | Laugier, Romain, Defrere, Denis, Matter, Alexis, Gross, Simon, Courtney-Barrer, Benjamin, Dannert, Felix, Woillez, Julien, Absil, Olivier, Dandumont, Colin |
| المساهمون: | CSL - Centre Spatial de Liège - ULiège, STAR - Space sciences, Technologies and Astrophysics Research - ULiège |
| المصدر: | Proceedings of SPIE: The International Society for Optical Engineering, 12183 (2022-08-26); SPIE Astronomical Telescopes + Instrumentation 2022, Montréal, Canada [CA], du 17 juillet au 22 juillet 2022 |
| بيانات النشر: | International Society for Optical Engineering, 2022. |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | Nulling interferometry, simulator, kernel-nulling, VLTI, Hi-5, Photonics, Double-Bracewell, Physical, chemical, mathematical & earth Sciences, Space science, astronomy & astrophysics, Physique, chimie, mathématiques & sciences de la terre, Aérospatiale, astronomie & astrophysique |
| الوصف: | While VLTI offers the recombination of four 8-m telescopes with baselines of more than 100m, it has never hosted a dedicated high-contrast nulling beam-combiner. The SCIFY project aims to design, build and commission Hi- 5, the first nulling beam-combiner of the VLTI, optimized for the detection and characterization of young giant exoplanets near the snow line, with spectroscopy up to R=2000 in the L’ band. It will make use of advanced four-beam nulling combination schemes, like double-Bracewell and kernel-nulling implemented in a single-mode photonic device to produce differential nulled outputs with self-calibrating properties. In the wavelength range of interest, both instrumental errors and background noise are significant. In order to estimate the practical performance of these different configurations in the presence of instrumental errors and further optimize the instrumental design, we have developed SCIFYsim. SCIFYsim is an end-to-end simulator geared towards single- mode beam combiners with of a wide variety of instrumental errors, like optical path difference residuals from fringe tracking, wavefront error at the injection, longitudinal dispersion, chromaticity of the combiner chip, and more. In order to evaluate the performance of the combined spectral channels, we use statistical tests based on likelihood ratios, and account for the covariance in the data. In this paper, we present the expected performance of Hi-5 with a few examples and discuss the main technical limitations to reach the contrast required to image young giant exoplanets. SCIFY |
| نوع الوثيقة: | conference paper http://purl.org/coar/resource_type/c_5794 conferenceObject |
| اللغة: | English |
| Relation: | info:eu-repo/grantAgreement/EC/H2020/866070; urn:issn:0277-786X; urn:issn:1996-756X |
| DOI: | 10.1117/12.2629292 |
| URL الوصول: | https://orbi.uliege.be/handle/2268/294132 |
| حقوق: | open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess |
| رقم الأكسشن: | edsorb.294132 |
| قاعدة البيانات: | ORBi |
| DOI: | 10.1117/12.2629292 |
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