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Pushing high angular resolution and high contrast observations on the VLTI from Y to L band with the Asgard instrumental suite: integration status and plans
Marc-Antoine Martinod, Michael J. Ireland, Denis Defrère +39
ESO's VLTI has a history of record-breaking discoveries in astrophysics using high-angular resolution instrumentation. Its latest visitor instrument, the Asgard instrumental suite,…
Recent and Upcoming Upgrades for MIRC-X and MYSTIC on the CHARA Array
Noura Ibrahim, Mayra Gutierrez, John D. Monnier +17
MIRC-X and MYSTIC are six-telescope near-infrared beam (1.08-2.38 m) combiners at the CHARA Array on Mt Wilson CA, USA. Ever since the commissioning of MIRC-X (J and H bands) in…
Pushing high angular resolution and high contrast observations on the VLTI from Y to L band with the Asgard instrumental suite: integration status and plans
Marc-Antoine Martinod, Denis Defrère, Michael J. Ireland +35
ESO's Very Large Telescope Interferometer has a history of record-breaking discoveries in astrophysics and significant advances in instrumentation. The next leap forward is its new…
High-angular resolution and high-contrast VLTI observations from Y to L band with the Asgard instrumental suite
Marc-Antoine Martinod, Denis Defrère, Michael Ireland +17
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 in…
Gaussian phase autocorrelation as an accurate compensator for FFT-based atmospheric phase screen simulations
Sorabh Chhabra, Jyotirmay Paul, A. N. Ramaprakash +1
Accurately simulating the atmospheric turbulence behaviour is always challenging. The well-known FFT based method falls short in correctly predicting both the low and high frequenc…
Speckle simulation tool for automated modelling of a large range of telescope aperture to fried parameter ratios
Sorabh Chhabra, Abhay A. Kohok, Bhushan S. Joshi +3
The Speckle Imager via MUlti Layer Atmospheric Turbulence Object Reconstructor (SIMULATOR) is a lab-based testbed instrument developed to test for speckle correlation-based techniq…
Spectrograph design for the Asgard/BIFROST spectro-interferometric instrument for the VLTI
Sorabh Chhabra, Michele Frangiamore, Stefan Kraus +4
The BIFROST instrument will be the first VLTI instrument optimised for high spectral resolution up to R=25,000 and operate between 1.05 and 1.7 m. A key component of the instrum…
Beam combiner for the Asgard/BIFROST instrument
Daniel J. Mortimer, Sorabh Chhabra, Stefan Kraus +4
BIFROST will be a short-wavelength ( = 1.0 - 1.7m) beam combiner for the VLT Interferometer, combining both high spatial (/2B = 0.8 mas) and spectral (up to R = 25,000) re…
High spectral-resolution interferometry down to 1 micron with Asgard/BIFROST at VLTI: Science drivers and project overview
Stefan Kraus, Daniel Mortimer, Sorabh Chhabra +10
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)…
A generalized approach to compensate for low and high frequency errors in FFT based phase screen simulations
Sorabh Chhabra, Jyotirmay Paul, Anamparambu N. Ramaprakash +1
Fast Fourier Transform based phase screen simulations give accurate results only when the screen size () is much larger than the outer scale parameter (). Otherwise, they f…