Results 31 to 40 of about 5,753 (177)

Stability analysis of VBT Echelle spectrograph for precise radial velocity measurements

, 2017
A fiber-fed Echelle spectrograph at 2.3 m Vainu Bappu Telescope (VBT), Kavalur, has been in operation since 2005. Owing to various technological advancements in precision spectroscopy in recent years, several research avenues have been opened in ...
Banyal, Ravinder K., Chamarthi, Sireesha, Pandey, Gajendra, Sriram, S.   +3 more
core   +1 more source

Infrared Helium-Hydrogen Line Ratios as a Measure of Stellar Effective Temperature [PDF]

, 2000
We have observed a large sample of compact planetary nebulae in the near-infrared to determine how the 2^1P-2^1S HeI line at 2.058um varies as a function of stellar effective temperature, Teff.
Hoare, M. G., Lumsden, S. L., Puxley, P. J.   +2 more
core   +3 more sources

Geological processes shaping freshwater biodiversity: a synthesis of global evidence

Biological Reviews, EarlyView.
ABSTRACT Recent genomic data highlight the key roles of geological processes in shaping the diversification and biogeography of freshwater lineages. Specifically, physical processes such as tectonic uplift, erosion, glaciation, lake formation, and sea‐level fluctuation contribute extensively to the evolution of biotic diversity within and among ...
Jonathan M. Waters, Christopher P. Burridge, David Craw, James S. Albert   +3 more
wiley   +1 more source

CHISL: The Combined High-resolution and Imaging Spectrograph for the LUVOIR Surveyor

, 2016
NASA is currently carrying out science and technical studies to identify its next astronomy flagship mission, slated to begin development in the 2020s. It has become clear that a Large Ultraviolet/Optical/IR (LUVOIR) Surveyor mission (primary diameter 12
Fleming, Brian, France, Kevin, Hoadley, Keri   +2 more
core   +1 more source

Water Vapor Vertical Distribution on Mars After Six Years of TGO/NOMAD Solar Occultations: 1. Global Climatology

Journal of Geophysical Research: Planets, Volume 131, Issue 2, February 2026.
Abstract We present vertical profiles of water vapor obtained during six continuous years of solar occultation observations in the infrared by the Nadir and Occultation for MArs Discovery (NOMAD) instrument on board Trace Gas Orbiter. The retrievals have been performed with an inversion code previously applied to smaller samples of this data set, but ...
A. Brines, M. A. López‐Valverde, B. Funke, F. González‐Galindo, S. Aoki, I. R. Thomas, G. L. Villanueva, G. Liuzzi, J. T. Erwin, U. Grabowski, F. Forget, J. J. Lopez‐Moreno, J. Rodriguez‐Gomez, F. Daerden, L. Trompet, B. Ristic, M. R. Patel, J. A. Holmes, G. Bellucci, A. Modak, A. C. Vandaele   +20 more
wiley   +1 more source

Single mode, extreme precision Doppler spectrographs

, 2012
The 'holy grail' of exoplanet research today is the detection of an earth-like planet: a rocky planet in the habitable zone around a main-sequence star.
Betters, Christopher H., Bland-Hawthorn, Joss, Leon-Saval, Sergio G., Mahadevan, Suvrath, Schwab, Christian   +4 more
core   +1 more source

A Calibrated Measurement of the Near-IR Continuum Sky Brightness Using Magellan/FIRE [PDF]

, 2012
We characterize the near-IR sky background from 308 observations with the FIRE spectrograph at Magellan. A subset of 105 observations selected to minimize lunar and thermal effects gives a continuous, median spectrum from 0.83 to 2.5 microns which we ...
Simcoe, Robert A., Sullivan, Peter W.
core   +2 more sources

Water Vapor Vertical Distribution on Mars After Six Years of TGO/NOMAD Solar Occultations: 2. Cross‐Validation Within TGO and Comparison With MPCM

Journal of Geophysical Research: Planets, Volume 131, Issue 2, February 2026.
Abstract This is the second part of an investigation of water vapor in the Martian atmosphere using solar occultation observations by the Nadir and Occultation for MArs Discovery (NOMAD) spectrometer on board the ExoMars Trace Gas Orbiter. Following the analysis of six Earth years of NOMAD observations performed in the first part, a cross‐validation ...
A. Brines, M. A. López‐Valverde, F. González‐Galindo, S. Aoki, A. Fedorova, D. Belyaev, F. Forget, E. Vos, F. Montmessin, B. Funke, J. J. Lopez‐Moreno, J. Rodriguez‐Gomez, F. Daerden, I. R. Thomas, L. Trompet, A. Modak, G. L. Villanueva, M. R. Patel, G. Bellucci, A. C. Vandaele   +19 more
wiley   +1 more source

A Tunable Echelle Imager [PDF]

, 2000
We describe and evaluate a new instrument design called a Tunable Echelle Imager (TEI). In this instrument, the output from an imaging Fabry-Perot interferometer is cross-dispersed by a grism in one direction and dispersed by an echelle grating in the ...
Atherton P. D., Bacon R., Bland-Hawthorn J., Bottema M., I. K. Baldry, J. Bland‐Hawthorn, Jacquinot P., le Coarer E.   +7 more
core   +3 more sources

An arbuscular mycorrhiza from the 407‐million‐year‐old Windyfield Chert identified through advanced fluorescence and Raman imaging

New Phytologist, Volume 249, Issue 1, Page 448-459, January 2026.
Summary Mycorrhizal associations between fungi and plants are a fundamental aspect of terrestrial ecosystems. Mycorrhizas occur in c. 85% of extant plants, yet their geological record remains sparse. Rare fossil evidence from early terrestrial environments offers crucial insights into these ancient symbioses, but visualizing fossil fungi at the ...
Christine Strullu‐Derrien, Raymond Wightman, Liam Patrick McDonnell, Gareth Evans, Frédéric A. Fercoq, Paul Kenrick, Andrea C. Ferrari, Sebastian Schornack   +7 more
wiley   +1 more source