| 1. |
- Di Marcantonio, P., et al.
(författare)
-
ELT High Resolution Spectrograph : Phase-A software architecture study
- 2018
-
Ingår i: SOFTWARE AND CYBERINFRASTRUCTURE FOR ASTRONOMY V. - : SPIE-INT SOC OPTICAL ENGINEERING. - 9781510619685
-
Konferensbidrag (refereegranskat)abstract
- High resolution spectroscopy has been considered of a primary importance to exploit the main scientific cases foreseen for ESO ELT, the Extremely Large Telescope, the future largest optical-infrared telescope in the world. In this context ESO commissioned a Phase-A feasibility study for the construction of a high resolution spectrograph for the ELT, tentatively named HIRES. The study, which lasted 1.5 years, started on March 2016 and was completed with a review phase held at Garching ESO headquarters with the aim to assess the scientific and technical feasibility of the proposed instrument. One of the main tasks of the study is the architectural design of the software covering all the aspects relevant to control an astronomical instrument: from observation preparation through instrument hardware and detectors control till data reduction and analysis. In this paper we present the outcome of the Phase-A study for the proposed HIRES software design highlighting its peculiarities, critical areas and performance aspects for the whole data flow. The End-to-End simulator, a tool already capable of simulating HIRES end products and currently being used to drive some design decision, is also shortly described.
|
|
| 2. |
- Genoni, M., et al.
(författare)
-
End to end simulators : a flexible and scalable cloud-based architecture Application to high resolution spectrographs ESPRESSO and ELT-HIRES
- 2020
-
Ingår i: Experimental astronomy. - : SPRINGER. - 0922-6435 .- 1572-9508. ; 50:2-3, s. 215-232
-
Tidskriftsartikel (refereegranskat)abstract
- Simulations of frames from existing and upcoming high-resolution spectrographs, targeted for high accuracy radial velocity measurements, are computationally demanding (both in time and space). We present in this paper an innovative approach based on both parallelization and distribution of the workload. By using NVIDIA CUDA custom-made kernels and state-of-the-art cloud-computing architectures in a Platform as a Service (PaaS) approach, we implemented a modular and scalable end-to-end simulator that is able to render synthetic frames with an accuracy of the order of few cm/sec, while keeping the computational time low. We applied our approach to two spectrographs. For VLT-ESPRESSO we give a sound comparison between the actual data and the simulations showing the obtained spectral formats and the recovered instrumental profile. We also simulate data for the upcoming HIRES at the ELT and investigate the overall performance in terms of computational time and scalability against the size of the problem. In addition we demonstrate the interface with data-reduction systems and we preliminary show that the data can be reduced successfully by existing methods.
|
|
| 3. |
- Genoni, M., et al.
(författare)
-
ELT -HIRES the High Resolution Spectrograph for the ELT : End to End simulator. Design approach and results
- 2018
-
Ingår i: MODELING, SYSTEMS ENGINEERING, AND PROJECT MANAGEMENT FOR ASTRONOMY VIII. - : SPIE-INT SOC OPTICAL ENGINEERING. - 9781510619647
-
Konferensbidrag (refereegranskat)abstract
- We present the updated design and architecture of the End-to-End simulator model of the high resolution spectrograph HIRES for the future Extremely Large Telescope (ELT). The model allows to simulate the propagation of photons starting from the scientific object of interest up to the detector, allowing to evaluate the performance impact of the different parameters in the spectrograph design. The model also includes a calibration light module, suitable to evaluate data reduction requirements. In this paper, we will detail the architecture of the simulator and the computational model which are strongly characterized by modularity and flexibility that will be crucial in the next generation instrumentation for projects such as the ELT due to of the high complexity and long-time design and development. We also highlight the Cloud Computing Architecture adopted for this software based on Amazon Web Services (AWS). We also present synthetic images obtained with the current version of the End-to-End simulator based on the requirements for ELT-HIRES (especially high radial velocity accuracy) that are then ingested in the Data reduction Software (DRS) of CRIRES+ as case study.
|
|
| 4. |
- Shulyak, D., et al.
(författare)
-
Analysis of surface structures of chemically peculiar stars with modern and future interferometers
- 2014
-
Ingår i: OPTICAL AND INFRARED INTERFEROMETRY IV. - : SPIE. - 9780819496140
-
Konferensbidrag (refereegranskat)abstract
- Interferometry is a very powerful observational technique known in astronomy for many decades. Its application to main-sequence stars, however, is still limited to only brightest objects. In this work we aim to explore the application of interferometry to a special class of main-sequence stars known as chemically peculiar (CP) stars. These stars demonstrate surface chemical abundance inhomogeneities (spots) that usually cover a considerable part of the stellar surface and induce a pronounced spectral and photometric variability. Interferometry thus has a potential to naturally resolve such spots in single stars, providing unique complementary information about spots sizes and contrasts. By means of numerical experiments we derive the actual interferometric requirements essential for the CP stars research that can be addressed in future instrument development. The first comparison between theoretical predictions and already available observations will also be discussed.
|
|
| 5. |
- Shulyak, D., et al.
(författare)
-
Interferometry of chemically peculiar stars : theoretical predictions versus modern observing facilities
- 2014
-
Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 443:2, s. 1629-1642
-
Tidskriftsartikel (refereegranskat)abstract
- By means of numerical experiments we explore the application of interferometry to the detection and characterization of abundance spots in chemically peculiar (CP) stars using the brightest star epsilon UMa as a case study. We find that the best spectral regions to search for spots and stellar rotation signatures are in the visual domain. The spots can clearly be detected already at a first visibility lobe and their signatures can be uniquely disentangled from that of rotation. The spots and rotation signatures can also be detected in near-infrared at low spectral resolution but baselines longer than 180 m are needed for all potential CP candidates. According to our simulations, an instrument like VEGA (or its successor e. g. Fibered and spectrally Resolved Interferometric Equipment New Design) should be able to detect, in the visual, the effect of spots and spots+rotation, provided that the instrument is able to measure V-2 approximate to 10(-3), and/or closure phase. In infrared, an instrument like AMBER but with longer baselines than the ones available so far would be able to measure rotation and spots. Our study provides necessary details about strategies of spot detections and the requirements for modern and planned interferometric facilities essential for CP star research.
|
|
| 6. |
|
|
