Spectrograph design for the Asgard/BIFROST spectro-interferometric instrument for the VLTI

Chhabra, Sorabh; Frangiamore, Michele; Kraus, Stefan; Bianco, Andrea; Garzón, F.; Mortimer, Daniel J.

doi:10.1117/12.2628805

Cited by 3 publications

(3 citation statements)

References 17 publications

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“…On the YJ arm, we plan for 3 gratings (R=1000, R=5000, R=25,000), where the considered grating technologies (volume Phase Holographic gratings and Binary gratings) are discussed in. 54 • Beam Splitter for high-resolution YJ arm: For high-spectral resolution observations, an asymmetric beam splitter can be moved into the beampath to redirect ∼ 90% of the light to the YJ arm.…”

Section: Subsystemsmentioning

confidence: 99%

High spectral-resolution interferometry down to 1 micron with Asgard/BIFROST at VLTI: science drivers and project overview

Kraus

Mortimer

Chhabra

et al. 2022

Optical and Infrared Interferometry and Imaging VIII

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We present science cases and instrument design considerations for the BIFROST instrument that will open the short-wavelength (Y/J/H-band), high spectral dispersion (up to R=25,000) window for the VLT Interferometer. BIFROST will be part of the Asgard Suite of instruments and unlock powerful venues for studying accretion & mass-loss processes at the early/late stages of stellar evolution, for detecting accreting protoplanets around young stars, and for probing the spin-orbit alignment in directly-imaged planetary systems and multiple star systems. Our survey on GAIA binaries aims to provide masses and precision ages for a thousand stars, providing a legacy data set for improving stellar evolutionary models as well as for Galactic Archaeology. BIFROST will enable off-axis spectroscopy of exoplanets in the 0.025-1" separation range, enabling high-SNR, high spectral resolution follow-up of exoplanets detected with ELT and JWST. We give an update on the status of the project, outline our key technology choices, and discuss synergies with other instruments in the proposed Asgard Suite of instruments.

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Section: Subsystemsmentioning

confidence: 99%

High spectral-resolution interferometry down to 1 micron with Asgard/BIFROST at VLTI: science drivers and project overview

Kraus

Mortimer

Chhabra

et al. 2022

Optical and Infrared Interferometry and Imaging VIII

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“…It also contains a 90/10 beam splitter that can be moved in to record data simultaneously with BIFROST's Low-Resolution arm (BIF-LR) and High-Resolution arm (BIF-HR). 13 The former comprises imaging optics, a prism for low-spectral dispersion at a fixed resolving power (R ¼ 50 to 80), and a camera. Also, it contains a Wollaston prism on a translation stage that can be moved in to measure separate polarization states to improve the calibration of the visibility.…”

Section: Introductionmentioning

confidence: 99%

High-angular resolution and high contrast observations from Y to L band at the Very Large Telescope Interferometer with the Asgard Instrumental suite

Martinod

Defrère

Ireland

et al. 2023

J. Astron. Telesc. Instrum. Syst.

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European Southern Observatory (ESO)'s Very Large Telescope Interferometer (VLTI), Paranal, Chile, is one of the most proficient observatories in the world for high angular resolution astronomy. It has hosted several interferometric instruments operating in various bandwidths in the infrared. As a result, the VLTI has yielded countless discoveries and technological breakthroughs. We propose to ESO a new concept for a visitor instrument for the VLTI: Asgard. It is an instrumental suite comprised of four natively collaborating instruments: High-Efficiency Multiaxial Do-it ALL Recombiner (HEIMDALLR), an all-in-one instrument performing both fringe tracking and stellar interferometry with the same optics; Baldr, a Strehl optimizer; Beam-combination Instrument for studying the Formation and fundamental paRameters of Stars and planeTary systems (BIFROST), a combiner whose main science case is studying the formation processes and properties of stellar and planetary systems; and Nulling Observations of dusT and planeTs (NOTT), a nulling interferometer dedicated to imaging young nearby planetary systems in the L band. The overlap between the science cases across different spectral bands yields the idea of making the instruments complementary to deliver sensitivity and accuracy from the J to L bands. Asgard is to be set on the former AMBER optical table. Its control architecture is a hybrid between custom and ESO-compliant developments to benefit from the flexibility offered to a visitor instrument and foresee a deeper long-term integration into VLTI for an opening to the community.

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“…New ideas and laboratory demonstrations have also emerged in recent years opening and enabling the path to novel scientific capabilities for optical interferometry. Leveraging these recent developments, the Asgard instrument suite will extend the scientific capabilities of the VLTI with a set of four instrument modules: BIFROST [1][2][3] (Beam-combination Instrument for studying the Formation and fundamental paRameters of Stars and planeTary systems) which is a Y/J/H-band combiner optimized for high spectral resolution, Baldr which is an H-band Further author information: Marc-Antoine Martinod: E-mail: marc-antoine.martinod@kuleuven.be injection optimizer for BIFROST, HEIMDALLR 4 which is a high-sensitivity K-band fringe tracker, and Hi-5 [5][6][7][8][9][10] which is an L-band nuller optimized for high-contrast observations. This paper presents the instrument capabilities and key scientific objectives of Asgard.…”

Section: Introductionmentioning

confidence: 99%

High-angular and high-contrast VLTI observations from J to M band with the Asgard instrumental suite

Martinod

Defrère

Ireland

et al. 2022

Optical and Infrared Interferometry and Imaging VIII

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The Very Large Telescope Interferometer is one of the most proficient observatories in the world for high angular resolution. Since its first observations, it has hosted several interferometric instruments operating in various bandwidths in the infrared. As a result, the VLTI yields countless discoveries and technological breakthroughs. We introduce to the VLTI the new concept of Asgard: an instrumental suite including four natively collaborating instruments: BIFROST, a stellar interferometer dedicated to the study of the formation of multiple systems; Hi-5, a nulling interferometer dedicated to imaging young nearby planetary systems in the M band; HEIMDALLR, an all-in-one instrument performing both fringe tracking and stellar interferometry with the same optics; Baldr, a fibre-injection optimiser. These instruments share common goals and technologies. Thus, the idea of this suite is to make the instruments interoperable and complementary to deliver unprecedented sensitivity and accuracy from J to M bands. The interoperability of the Asgard instruments and their integration in the VLTI are the main challenges of this project. In this paper, we introduce the overall optical design of the Asgard suite, the different modules, and the main challenges ahead.

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Spectrograph design for the Asgard/BIFROST spectro-interferometric instrument for the VLTI

Cited by 3 publications

References 17 publications

High spectral-resolution interferometry down to 1 micron with Asgard/BIFROST at VLTI: science drivers and project overview

High spectral-resolution interferometry down to 1 micron with Asgard/BIFROST at VLTI: science drivers and project overview

High-angular resolution and high contrast observations from Y to L band at the Very Large Telescope Interferometer with the Asgard Instrumental suite

High-angular and high-contrast VLTI observations from J to M band with the Asgard instrumental suite

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