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Professor James Osborn's Outputs (74)

Scintillation correction for astronomical photometry on large and extremely large telescopes with tomographic atmospheric reconstruction (2014)
Journal Article
Osborn, J. (2015). Scintillation correction for astronomical photometry on large and extremely large telescopes with tomographic atmospheric reconstruction. Monthly Notices of the Royal Astronomical Society, 446(2), 1305-1311. https://doi.org/10.1093/mnras/stu2175

We describe a new concept to correct for scintillation noise on high-precision photometry in large and extremely large telescopes using telemetry data from adaptive optics (AO) systems. Most wide-field AO systems designed for the current era of very... Read More about Scintillation correction for astronomical photometry on large and extremely large telescopes with tomographic atmospheric reconstruction.

Daytime site characterisation of La Palma, and its relation to night-time conditions (2014)
Presentation / Conference Contribution
Townson, M., Kellerer, A., Osborn, J., Butterley, T., Morris, T., & Wilson, R. (2014, December). Daytime site characterisation of La Palma, and its relation to night-time conditions. Presented at Ground-based and Airborne Instrumentation for Astronomy V, Montréal, Quebec

This paper presents preliminary daytime profiles taken using a Wide-Field Shack-Hartmann Sensor at the Swedish Solar Telescope (SST), La Palma. These are contrasted against Stereo-SCIDAR data from corresponding nights to assess the validity of the as... Read More about Daytime site characterisation of La Palma, and its relation to night-time conditions.

Open loop tomography with artificial neural networks on CANARY: on-sky results (2014)
Journal Article
Osborn, J., Guzman, D., De Cos Juez, F., Basden, A., Morris, T., Gendron, E., …Rousset, G. (2014). Open loop tomography with artificial neural networks on CANARY: on-sky results. Monthly Notices of the Royal Astronomical Society, 441(3), 2508-2514. https://doi.org/10.1093/mnras/stu758

We present recent results from the initial testing of an artificial neural network (ANN)-based tomographic reconstructor Complex Atmospheric Reconstructor based on Machine lEarNing (CARMEN) on CANARY, an adaptive optics demonstrator operated on the 4... Read More about Open loop tomography with artificial neural networks on CANARY: on-sky results.

Stereo-SCIDAR: optical turbulence profiling with high sensitivity using a modified SCIDAR instrument (2013)
Journal Article
Shepherd, H., Osborn, J., Wilson, R., Butterley, T., Avila, R., Dhillon, V., & Morris, T. (2014). Stereo-SCIDAR: optical turbulence profiling with high sensitivity using a modified SCIDAR instrument. Monthly Notices of the Royal Astronomical Society, 437(4), 3568-3577. https://doi.org/10.1093/mnras/stt2150

The next generation of adaptive optics systems will require tomographic reconstruction techniques to map the optical refractive index fluctuations, generated by the atmospheric turbulence, along the line of sight to the astronomical target. These sys... Read More about Stereo-SCIDAR: optical turbulence profiling with high sensitivity using a modified SCIDAR instrument.

Atmospheric turbulence profiling using multiple laser star wavefront sensors (2012)
Journal Article
Cortés, A., Neichel, B., Guesalaga, A., Osborn, J., Rigaut, F., & Guzman, D. (2012). Atmospheric turbulence profiling using multiple laser star wavefront sensors. Monthly Notices of the Royal Astronomical Society, 427(3), 2089-2099. https://doi.org/10.1111/j.1365-2966.2012.22076.x

This paper describes the data pre-processing and reduction methods together with SLOpe Detection And Ranging (SLODAR) analysis and wind profiling techniques for the Gemini South Multi-Conjugate Adaptive Optics System (GeMS). The wavefront gradient me... Read More about Atmospheric turbulence profiling using multiple laser star wavefront sensors.

Using artificial neural networks for open-loop tomography (2012)
Journal Article
Osborn, J., De Cos Juez, F. J., Guzman, D., Butterley, T., Myers, R., Guesalaga, A., & Laine, J. (2012). Using artificial neural networks for open-loop tomography. Optics Express, 20(3), 2420-2434. https://doi.org/10.1364/oe.20.002420

Modern adaptive optics (AO) systems for large telescopes require tomographic techniques to reconstruct the phase aberrations induced by the turbulent atmosphere along a line of sight to a target which is angularly separated from the guide sources tha... Read More about Using artificial neural networks for open-loop tomography.

Conjugate-plane photometry: reducing scintillation in ground-based photometry (2011)
Journal Article
Osborn, J., Wilson, R. W., Dhillon, V., Avila, R., & Love, G. D. (2011). Conjugate-plane photometry: reducing scintillation in ground-based photometry. Monthly Notices of the Royal Astronomical Society, 411(2), 1223-1230. https://doi.org/10.1111/j.1365-2966.2010.17759.x

High-precision fast photometry from ground-based observatories is a challenge due to intensity fluctuations (scintillation) produced by the Earth's atmosphere. Here we describe a method to reduce the effects of scintillation by a combination of pupil... Read More about Conjugate-plane photometry: reducing scintillation in ground-based photometry.

Profiling the surface layer of optical turbulence with SLODAR (2010)
Journal Article
Osborn, J., Wilson, R., Butterley, T., Shepherd, H., & Sarazin, M. (2010). Profiling the surface layer of optical turbulence with SLODAR. Monthly Notices of the Royal Astronomical Society, 406(2), 1405-1408. https://doi.org/10.1111/j.1365-2966.2010.16795.x

A prototype of a new SLope Detection And Ranging (SLODAR) instrument for atmospheric optical turbulence profiling has been developed by the Centre for Advanced Instrumentation at Durham University. The instrument targets double stars with wide separa... Read More about Profiling the surface layer of optical turbulence with SLODAR.