Results 41 to 50 of about 10,029 (146)

Radial velocities of planetary nebulae towards the Galactic bulge

open access: yes, 2007
. Accurate radial velocities for a sample of 71 planetary nebulae, mostly located in the direction of the Galactic Centre, are presented. Most of the nebulae discussed in this paper are likely members of the Galactic bulge, based on their radial velocity,
J. R. Walsh, Albert Zijlstra, A. Acker
core  

Radial velocity technique

open access: yes
Preprint of a chapter for the 'Encyclopedia of Astrophysics' (Editor-in-Chief Ilya Mandel, Section Editor Dimitri Veras) to be published by Elsevier as a Reference Module.
openaire   +2 more sources

Photoelectric Radial Velocities – I: TECHNIQUE [PDF]

open access: yesMonthly Notices of the Royal Astronomical Society, 1974
G. W. van Citters, B. Warner
openaire   +1 more source

BEBOP VI. enabling the detection of circumbinary planets orbiting double-lined binaries with the DOLBY method of radial-velocity extraction

open access: yes
Circumbinary planets, orbiting both stars in a binary system, offer the opportunity to study planet formation and orbital migration in an environment different from that around single stars.
Nelson, Richard P   +15 more
core   +1 more source

The S B 9 catalogue: status, comparison with non-single stars from Gaia DR3, and evolution to S B X

open access: yes
The Ninth Catalogue of Spectroscopic Binary Orbits (S) is a comprehensive compilation of spectroscopic binaries (SBs) with orbital parameters sourced from the literature, comprising approximately 4000 systems with about 2800 single-lined and 1200 double ...
Traven, G   +11 more
core   +1 more source

The TOI-2427 system: Two close-in planets orbiting a late K-dwarf star

open access: yes
Using high-precision photometry, NASA’s TESS space mission has discovered many intriguing transiting planet candidates. These discoveries require ground-based follow-up observations, including high-precision Doppler spectroscopy, to rule out false ...
Acuña, L.   +22 more
core   +1 more source

Improved characterization of the TOI-2141 system: A dense sub-Neptune with non-transiting inner and outer companions

open access: yes
Aims. We aim to refine the fundamental parameters of the TOI-2141 planetary system, which includes a transiting sub-Neptune orbiting a Sun-like star on a relatively long orbit of 18.26 days, by combining new photometric and spectroscopic observations ...
Ragazzoni, R.   +89 more
core   +1 more source

HARPS-N, TESS, and CHEOPS discover a transiting sub-Neptune and two outer companions around the bright solar analogue HD 85426

open access: yes
We provide a detailed characterisation of the planetary system orbiting HD 85426 (TOI-1774). This bright G-type star (M*: 0.99 M⊙; R*: 1.13 R⊙; age: 7.4 Gyr; V mag: 8.25) hosts a transiting sub-Neptune, HD 85426 b, with an orbital period of 16.71 days ...
Lam, K W F   +98 more
core   +1 more source

How Close Are We To Detecting Earth-like Planets in the Habitable Zone Using the Radial Velocity Technique?

open access: yes, 2011
Discovering an Earth-like exoplanet in habitable zone is an important milestone for astronomers in search of extra-terrestrial life. While the radial velocity (RV) technique remains one the most powerful tools in detecting and characterizing exo-planetary sys- tems, we calculate the uncertainties in precision RV measurements considering stellar ...
Wang, Ji, Ge, Jian
openaire   +2 more sources

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