Results 21 to 30 of about 2,439,305 (313)
TOI 560: Two Transiting Planets Orbiting a K Dwarf Validated with iSHELL, PFS, and HIRES RVs
The Astronomical Journal, 2022 We validate the presence of a two-planet system orbiting the 0.15–1.4 Gyr K4 dwarf TOI 560 (HD 73583). The system consists of an inner moderately eccentric transiting mini-Neptune (TOI 560 b, $P={6.3980661}_{-0.0000097}^{+0.0000095}$ days, $e={0.294}_{-0.
Mohammed El Mufti +95 more
doaj +1 more source
Correction of Dual-PRF Velocity for Operational S-Band Doppler Weather Radar
Remote Sensing, 2023 The Weather Radar Center (WRC) of the Korea Meteorological Administration (KMA) has been providing three-dimensional radar wind fields based on the “WInd Synthesis System using Doppler Measurements (WISSDOM)” in real time since February 2019.
So-Yeon Park +2 more
doaj +1 more source
Three years of HARPS-N high-resolution spectroscopy and precise radial velocity data for the Sun [PDF]
Astronomy & Astrophysics, 2020 Context. The solar telescope connected to HARPS-N has been observing the Sun since the summer of 2015. Such a high-cadence, long-baseline data set is crucial for understanding spurious radial-velocity signals induced by our Sun and by the instrument.
X. Dumusque +37 more
semanticscholar +1 more source
Precise Radial Velocities and Radial Velocity Standards [PDF]
Symposium - International Astronomical Union, 1985 By imposing absorption lines of HF in stellar spectra we can measure changes in r.v. with a precision of ~10m/s from a single spectrum, provided stellar line profiles are not distorted by atmospheric motions. The precision of absolute radial velocities is currently limited to ~100m/s by knowledge of rest wavelengths.
G. A. H. Walker +3 more
openaire +1 more source
PRECISION RADIAL VELOCITIES WITH CSHELL [PDF]
The Astrophysical Journal, 2011 31 pages, 3 figures, 2 tables, accepted for publication in ...
Crockett, Christopher J. +5 more
openaire +3 more sources
A wide star–black-hole binary system from radial-velocity measurements [PDF]
Nature, 2019 All stellar-mass black holes have hitherto been identified by X-rays emitted from gas that is accreting onto the black hole from a companion star. These systems are all binaries with a black-hole mass that is less than 30 times that of the Sun1–4. Theory
Jifeng Liu +54 more
semanticscholar +1 more source
Photometry as a Proxy for Stellar Activity in Radial Velocity Analyses [PDF]
Astronomical Journal, 2020 Stellar activity remains a limiting factor in measuring precise planet parameters from radial velocity spectroscopy, not least in the search for Earth-mass planets orbiting in the habitable zones of Sun-like stars.
M. Kosiarek, I. Crossfield
semanticscholar +1 more source
The fundamental definition of “radial velocity” [PDF]
Astronomy & Astrophysics, 2003 19 pages, 1 figure.
Lindegren, Lennart, Dravins, Dainis
openaire +2 more sources
Automated Recognition of Macro Downburst Using Doppler Weather Radar
Atmosphere, 2022 In light of the macro downburst’s ground divergent flow field characteristics and high reflectivity, this paper proposes an algorithm for identifying the downburst area using a Doppler weather radar low-level radial velocity and reflectivity factor ...
Xu Wang +4 more
doaj +1 more source
Hydrodynamic flow between rotating stretchable disks in an orthotropic porous medium [PDF]
Songklanakarin Journal of Science and Technology (SJST), 2020 A mathematical model of convective steady flow over rotating disks in an orthotropic porous medium has been developed and solved the non-dimentional governing equations for flow by the shooting method that uses fourth order Runge- Kutta integration ...
K. Gowthami +3 more
doaj +1 more source