First On-Sky Demonstration of a Scintillation Correction technique using Tomographic Wavefront Sensing (2023)
Journal Article
Hartley, K. E., Farley, O. J., Townson, M. J., Osborn, J., & Wilson, R. (2023). First On-Sky Demonstration of a Scintillation Correction technique using Tomographic Wavefront Sensing. Monthly Notices of the Royal Astronomical Society, 520(3), 4134-4146. https://doi.org/10.1093/mnras/stad420

Scintillation noise significantly limits high precision ground-based photometry of bright stars. In this paper we present the first ever on-sky demonstration of scintillation correction. The technique uses tomographic wavefront sensing to estimate th... Read More about First On-Sky Demonstration of a Scintillation Correction technique using Tomographic Wavefront Sensing.

SHIMM: a versatile seeing monitor for astronomy (2023)
Journal Article
Perera, S., Wilson, R. W., Butterley, T., Osborn, J., Farley, O. J., & Laidlaw, D. J. (2023). SHIMM: a versatile seeing monitor for astronomy. Monthly Notices of the Royal Astronomical Society, 520(4), 5475-5486. https://doi.org/10.1093/mnras/stad339

Characterization of atmospheric optical turbulence is crucial for the design and operation of modern ground-based optical telescopes. In particular, the effective application of adaptive optics correction on large and extremely large telescopes relie... Read More about SHIMM: a versatile seeing monitor for astronomy.

Demonstrating 24-hour continuous vertical monitoring of atmospheric optical turbulence (2023)
Journal Article
Griffiths, R., Osborn, J., Farley, O., Butterley, T., Townson, M. J., & Wilson, R. (2023). Demonstrating 24-hour continuous vertical monitoring of atmospheric optical turbulence. Optics Express, 31(4), 6730-6740. https://doi.org/10.1364/oe.479544

We report what is believed to be the first example of fully continuous, 24-hour vertical monitoring of atmospheric optical turbulence. This is achieved using a novel instrument, the 24-hour Shack-Hartmann Image Motion Monitor (24hSHIMM). Optical turb... Read More about Demonstrating 24-hour continuous vertical monitoring of atmospheric optical turbulence.

FAST: Fourier domain adaptive optics simulation tool for bidirectional ground-space optical links through atmospheric turbulence (2022)
Journal Article
Farley, O., Townson, M., & Osborn, J. (2022). FAST: Fourier domain adaptive optics simulation tool for bidirectional ground-space optical links through atmospheric turbulence. Optics Express, 30(13), 23050-23064. https://doi.org/10.1364/oe.458659

Free space optical links between the ground and space may be severely degraded by atmospheric turbulence. Adaptive Optics, a technique allowing partial correction of this degradation, is beginning to see use in the field with the potential to achieve... Read More about FAST: Fourier domain adaptive optics simulation tool for bidirectional ground-space optical links through atmospheric turbulence.

Correction of finite spatial and temporal sampling effects in stereo-SCIDAR (2020)
Conference Proceeding
Butterley, T., Sarazin, M., Le Louarn, M., Osborn, J., & Farley, O. J. (2020). Correction of finite spatial and temporal sampling effects in stereo-SCIDAR. . https://doi.org/10.1117/12.2562559

Stereo scintillation detection and ranging (S-SCIDAR) is a development of the well-established SCIDAR turbulence profiling technique. An S-SCIDAR instrument has been installed at the focus of one of the 1.8m Auxiliary Telescopes at Paranal observator... Read More about Correction of finite spatial and temporal sampling effects in stereo-SCIDAR.

Wind-driven halo in high-contrast images (2020)
Journal Article
Cantalloube, F., Farley, O., Milli, J., Bharmal, N., Brandner, W., Correia, C., …Vigan, A. (2020). Wind-driven halo in high-contrast images. Astronomy & Astrophysics, 638, Article A98. https://doi.org/10.1051/0004-6361/201937397

Context. The wind-driven halo is a feature that is observed in images that were delivered by the latest generation of ground-based instruments that are equipped with an extreme adaptive optics system and a coronagraphic device, such as SPHERE at the... Read More about Wind-driven halo in high-contrast images.

Limitations imposed by optical turbulence profile structure and evolution on tomographic reconstruction for the ELT (2020)
Journal Article
Farley, O., Osborn, J., Morris, T., Fusco, T., Neichel, B., Correia, C., & Wilson, R. (2020). Limitations imposed by optical turbulence profile structure and evolution on tomographic reconstruction for the ELT. Monthly Notices of the Royal Astronomical Society, 494(2), 2773-2784. https://doi.org/10.1093/mnras/staa795

The performance of tomographic adaptive optics (AO) systems is intrinsically linked to the vertical profile of optical turbulence. First, a sufficient number of discrete turbulent layers must be reconstructed to model the true continuous turbulence p... Read More about Limitations imposed by optical turbulence profile structure and evolution on tomographic reconstruction for the ELT.

Identifying optical turbulence profiles for realistic tomographic error in adaptive optics (2019)
Journal Article
Farley, O., Osborn, J., Morris, T., Fusco, T., Neichel, B., Correia, C., & Wilson, R. (2019). Identifying optical turbulence profiles for realistic tomographic error in adaptive optics. Monthly Notices of the Royal Astronomical Society, 488(1), 213-221. https://doi.org/10.1093/mnras/stz1669

For extremely large telescopes, adaptive optics will be required to correct the Earth’s turbulent atmosphere. The performance of tomographic adaptive optics is strongly dependent on the vertical distribution (profile) of this turbulence. An important... Read More about Identifying optical turbulence profiles for realistic tomographic error in adaptive optics.

Representative optical turbulence profiles for ESO Paranal by hierarchical clustering (2018)
Journal Article
Farley, O., Osborn, J., Morris, T., Sarazin, M., Butterley, T., Townson, M., …Wilson, R. (2018). Representative optical turbulence profiles for ESO Paranal by hierarchical clustering. Monthly Notices of the Royal Astronomical Society, 481(3), 4030-4037. https://doi.org/10.1093/mnras/sty2536

Knowledge of the optical turbulence profile is important in adaptive optics (AO) systems, particularly tomographic AO systems such as those to be employed by the next generation of 40-m class extremely large telescopes. Site characterization and moni... Read More about Representative optical turbulence profiles for ESO Paranal by hierarchical clustering.

Optical turbulence profiling with Stereo-SCIDAR for VLT and ELT (2018)
Journal Article
Osborn, J., Wilson, R., Sarazin, M., Butterley, T., Chacon, A., Derie, F., …Townson, M. (2018). Optical turbulence profiling with Stereo-SCIDAR for VLT and ELT. Monthly Notices of the Royal Astronomical Society, 478(1), 825-834. https://doi.org/10.1093/mnras/sty1070

Knowledge of the Earth’s atmospheric optical turbulence is critical for astronomical instrumentation. Not only does it enable performance verification and optimisation of existing systems but it is required for the design of future instruments. As a... Read More about Optical turbulence profiling with Stereo-SCIDAR for VLT and ELT.