VERMILION: Visitor Extension spectRal sub-Mid-Infrared Light InterferOmeter iNstrument

Hadjara, M.; Petrov, Romain G.; Lagarde, S.; Chen, Xinyang; He, Jian‐Jun; Li, Zhu; López, B.; Millour, F.; Meilland, A.; Gallenne, A.; Leftley, James; Boskri, Abdelkarim; Chen, Jun-Cheng; Michael, Ernest; Diaz, Marcos P.; Méndez, René A.; Bayo, A.; Miguel, Piña,; Pereira, Gabriel Kalil Rocha; Manosalva, Sebastian; Nitschelm, Christian; Colque, Juan; Zhang, Congcong; Zhou, Dan; Allouche, F.; Hao, Yue; Berdja, A.; Besser, Felipe; Bechet, Clémentine Marie Zélia; Meissner, Andrés Guesalaga; Vanzi, L.; Mezaoui, Abderrahmane; Moussaoui, Nourredine

doi:10.1117/12.2627736

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“…Section 4 describes the way to combine the HFT chips in a very broad band instrument covering the J, H and K band, with an active correction of transverse and longitudinal atmospheric dispersion, validates the Boskri+ SNR prediction and presents a first estimation of the benefit of such a HFT for the AGN program of the VLTI in the J, L and N bands that are decisive to achieve the full cosmological potential based on QSOs direct distance estimates from the combination of VLTI and Reverberation Mapping observations [13]. The discussion section 5 lists the developments needed to achieve an operational HFT [14].…”

Section: Introductionmentioning

confidence: 61%

“…We have to finalize a servo loop optimized for an HFT and test it, first in computer simulations and then on the bench. And we need tests and demonstrations on the sky on the VLTI as key part of a visitor instrument [14] or at CHARA. This would help sorting some key questions:…”

Section: Discussionmentioning

confidence: 99%

“…This feature is decisive for the study of AGNs as we should have access to targets with redshifts from zero to 2. This design is the baseline of our proposals for a VLTI visitor instrument (VIPS proposal to the EII in December 2021 and VERMILION proposal described in another paper in these proceedings [14]).…”

Section: A Very Broad Band Hft and Its Potential For Agns On The Vlti...mentioning

confidence: 99%

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Hierarchical Fringe Tracking, sky coverage and AGNs with the VLTI

Petrov

Allouche

Boskri

et al. 2022

Optical and Infrared Interferometry and Imaging VIII

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Hierarchical Fringe Tracking (HFT) is a fringe tracking concept optimizing the sensitivity in optical long baseline by reducing to an absolute minimum the number of measurements used to correct the OPD fluctuations. By nature, the performances of an HFT do not decreases with the number of apertures of the interferometer and are set only by the flux delivered by the individual telescopes. This a critical feature for future interferometers with large number of apertures both for homodyne and heterodyne operation. Here we report the design and first optical bench tests of integrated optics HFT chips for a 4 telescopes interferometer such as the VLTI. These tests validate the HFT concept and confirm previous estimates that we could track accurately fringes on the VLTI up to nearly K~15.9 with the UTs and K~12.2 with the ATs with a J+H+K fringe tracker with one HFT chip per band. This is typically 2.5 magnitudes fainter than the best potential performance of the current ABCD fringe tracker in the K band. An active longitudinal and transverse chromatic dispersion correction allows the optimization of broad band fiber injections and instrumental contrast. We also present a preliminary evaluation of the potential of such a gain of sensitivity for the observations of AGNs with the VLTI.

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Section: Introductionmentioning

confidence: 61%

Section: Discussionmentioning

confidence: 99%

Section: A Very Broad Band Hft and Its Potential For Agns On The Vlti...mentioning

confidence: 99%

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