Results 21 to 30 of about 1,141 (166)
EPJ Web of Conferences, 2013 Ground-based high-dispersion (R ∼ 100,000) spectroscopy provides unique information on exoplanet atmospheres, inaccessible from space - even using the JWST or other future space telescopes. Recent successes in transmission- and dayside spectroscopy using
Snellen Ignas
doaj +1 more source
High-Resolution Arrayed-Waveguide-Gratings in Astronomy: Design and Fabrication Challenges
Photonics, 2017 A comprehensive design of a folded-architecture arrayed-waveguide-grating (AWG)-device, targeted at applications as integrated photonic spectrographs (IPS) in near-infrared astronomy, is presented.
Andreas Stoll +3 more
doaj +1 more source
Remote SensingUvsq-Sat NG is a French 6U CubeSat (10 × 20 × 30 cm) of the International Satellite Program in Research and Education (INSPIRE) designed primarily for observing greenhouse gases (GHG) such as CO2 and CH4, measuring the Earth’s radiation budget (ERB), and
Mustapha Meftah +27 more
doaj +1 more source
Nature Communications, 2016 Laser frequency combs emit a spectrum of equally spaced peaks that can provide precise frequency references useful for astronomy. Here, the authors demonstrate a frequency comb using electro-optical modulation, which has a line spacing that is resolvable
X. Yi +17 more
doaj +1 more source
Development of gas absorption cells for infrared echelle spectrographs
EPJ Web of Conferences, 2011 High-resolution spectroscopy in the near-infrared could become the leading method for discovering extra-solar planets around very low-mass stars and brown dwarfs.
Martín E.L. +4 more
doaj +1 more source
THE COSMIC ORIGINS SPECTROGRAPH [PDF]
The Astrophysical Journal, 2011 The Cosmic Origins Spectrograph (COS) is a moderate-resolution spectrograph with unprecedented sensitivity that was installed into the Hubble Space Telescope (HST) in May 2009, during HST Servicing Mission 4 (STS-125). We present the design philosophy and summarize the key characteristics of the instrument that will be of interest to potential ...
James C. Green +26 more
openaire +2 more sources
The GlobalJetWatch spectrographs: a fibre-fed spectrograph for small telescopes
SPIE Proceedings, 2008 The GlobalJetWatch project (www.globaljetwatch.net) will place small (0.5-metre) commerical telescopes in four schools around the world. Each telescope will be equipped with a custom designed spectrograph, currently being built by the Astrophysics sub-department of the University of Oxford.
Clarke, F +7 more
openaire +1 more source
MEGARA spectrograph optics [PDF]
SPIE Proceedings, 2012 MEGARA is the next optical Integral-Field Unit (IFU) and Multi-Object Spectrograph (MOS) for Gran Telescopio Canarias. The instrument offers two IFUs plus a Multi-Object Spectroscopy (MOS) mode: a large compact bundle covering 12.5 arcsec x 11.3 arcsec on sky with 100 μm fiber-core; a small compact bundle, of 8.5 arcsec x 6.7 arcsec with 70 μm fiber ...
Carrasco, E. +7 more
openaire +2 more sources
On the instrument profile of slit spectrographs [PDF]
Journal of the Optical Society of America A, 2014 We derive an analytic expression for the instrument profile of a slit spectrograph, also known as the line spread function. While this problem is not new, our treatment relies on the operatorial approach to the description of diffractive optical systems, which provides a general framework for the analysis of the performance of slit spectrographs under ...
Casini, R., de Wijn, A. G.
openaire +3 more sources
Detecting Exoplanets Closer to Stars with Moderate Spectral Resolution Integral-field Spectroscopy
The Astronomical Journal, 2023 While radial velocity surveys have demonstrated that the population of gas giants peaks around 3 au, the most recent high-contrast imaging surveys have only been sensitive to planets beyond ∼10 au.
Shubh Agrawal +12 more
doaj +1 more source