Results 11 to 20 of about 292,552 (259)

The Pathfinder testbed: exploring techniques for achieving precision radial velocities in the near infrared [PDF]

open access: greenSPIE Proceedings, 2010
The Penn State Pathfinder is a prototype warm fiber-fed Echelle spectrograph with a Hawaii-1 NIR detector that has already demonstrated 7-10 m/s radial velocity precision on integrated sunlight. The Pathfinder testbed was initially setup for the Gemini PRVS design study to enable a systematic exploration of the challenges of achieving high radial ...
L. W. Ramsey   +7 more
semanticscholar   +6 more sources

Search for exoplanets with the radial-velocity technique: quantitative diagnostics of stellar activity [PDF]

open access: bronzeAstronomy & Astrophysics, 2007
Aims: Stellar activity may complicate the analysis of high-precision radial-velocity spectroscopic data when looking for exoplanets signatures. We aim at quantifying the impact of stellar spots on stars with various spectral types and rotational velocities and comparing the simulations with data obtained with the HARPS spectrograph.
M. Desort   +4 more
openalex   +5 more sources

Search for Large Radial Velocities in Direction of NGP Using the Fehrenbach Techniques [PDF]

open access: bronzeHighlights of Astronomy, 1977
The Observatory of Strasbourg will participate in the future in the general radial velocity survey which is in hand at the Observatories of Haute-Provence and of Marseille with FEHRENBACH’s Objective-prism astrograph. A programme of this type, providing a large number of data, is particularly suitable at the place where the “Data Center” is growing up ...
A. Florsch
openalex   +3 more sources

Detectability of quasi-circular co-orbital planets. Application to the radial velocity technique [PDF]

open access: bronzeAstronomy & Astrophysics, 2015
Several celestial bodies in co-orbital configurations exist in the solar system. However, co-orbital exoplanets have not yet been discovered. This lack may result from a degeneracy between the signal induced by co-orbital planets and other orbital configurations.
A. Leleu   +2 more
openalex   +7 more sources

Consistent radial velocities of classical Cepheids from the cross-correlation technique [PDF]

open access: hybridAstronomy & Astrophysics, 2019
Context. Accurate radial velocities (vrad) of Cepheids are mandatory within the context of Cepheid distance measurements using the Baade-Wesselink technique. The most common vrad derivation method consists in cross-correlating the observed stellar spectra with a binary template and measuring a velocity on the resulting mean profile.
S. Borgniet   +13 more
openalex   +6 more sources

Radial velocity technique [PDF]

open access: green
The precise Doppler method for measuring stellar radial velocities (RV) is a fundamental technique in modern astronomy. This method records a star's spectrum and detects periodic Doppler shifts in its spectral features, which indicate the gravitational influences induced by orbiting companions.
T. Trifonov
openalex   +3 more sources

Detection of Planetary and Stellar Companions to Neighboring Stars via a Combination of Radial Velocity and Direct Imaging Techniques [PDF]

open access: bronzeThe Astronomical Journal, 2019
Abstract The sensitivities of radial velocity (RV) surveys for exoplanet detection are extending to increasingly longer orbital periods, where companions with periods of several years are now being regularly discovered. Companions with orbital periods that exceed the duration of the survey manifest in the data as an incomplete orbit or ...
Stephen R. Kane   +15 more
openalex   +6 more sources

Development of Iodine Cells for Subaru HDS and Okayama HIDES. III. An Improvement on the Radial-Velocity Measurement Technique [PDF]

open access: bronzePublications of the Astronomical Society of Japan, 2008
Abstract An improvement of the radial-velocity measurement accuracy is crucial for the detection of tiny stellar oscillations and exoplanets. Through the analysis of week-long extensive observations of solar-type stars (Procyon in 2000, 2002, and 2006/2007 and $\tau$ Cet in 2002 and 2006/2007), we have carefully examined, revised, and ...
Eiji Kambe   +16 more
openalex   +4 more sources

Inversion technique to obtain local ion temperature profiles for an axisymmetric plasma with toroidal and radial velocities

open access: greenPlasma Physics and Controlled Fusion, 2021
Abstract A matrix inversion technique is derived to calculate local ion temperature from line-integrated measurements of an extended emission source in an axisymmetric plasma which exactly corrects for both toroidal velocity and radial velocity components.
R. E. Bell
  +6 more sources

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