Sentences with phrase «star velocity measurements»
Vogt and Butler's team found the new planet by combining 119 star velocity measurements from HARPS with 122 measurements taken with a similar instrument called HIRES, which is mounted on the 10 - metre Keck 1 telescope in Hawaii.
https://www.newscientist.com/ Not exact matches
Fellow IoA astronomer Floor van Leeuwen agrees, adding that individual velocity measurements of the stars will resolve the question definitively, but probably not before 10 to 15 years from now, when new satellites take to the skies.
HARPS allows for measurements of radial velocities of stars, which can be affected by the presence of nearby planets, to be taken with the highest accuracy currently available.
That could be caused by spots on the star, which could confuse velocity measurements, or by the star expanding and contracting (known as stellar pulsations).
It appears to be a main sequence red dwarf star of spectral and luminosity type M4.5 V. Because of its small mass and great distance from the primary (Star A), Upsilon Andromedae B appears to have a negligible effect on the radial velocity measurements used to determine that Star A has at least three large planets (Lowrance et al, 20star of spectral and luminosity type M4.5 V. Because of its small mass and great distance from the primary (Star A), Upsilon Andromedae B appears to have a negligible effect on the radial velocity measurements used to determine that Star A has at least three large planets (Lowrance et al, 20Star A), Upsilon Andromedae B appears to have a negligible effect on the radial velocity measurements used to determine that Star A has at least three large planets (Lowrance et al, 20Star A has at least three large planets (Lowrance et al, 2002).
The Keck / DEIMOS combination is the only one in the world capable of making these velocity measurements for large numbers of Andromeda stars.»
For low - mass eclipsing binary stars, the method of eclipse minimum timing allows astronomers to search for smaller masses than those feasible with radial velocity measurements.
Abstract: We report precise radial velocity (RV) measurements of WASP - 47, a G star that hosts three transiting planets in close proximity (a hot Jupiter, a super-Earth and a Neptune - sized planet) and a non-transiting planet at 1.4 AU.
The host star is bright (V = 11.2, J = 9.1) and so may be a good target for precise radial velocity measurements.
For the super-Earth WA... ▽ More We report precise radial velocity (RV) measurements of WASP - 47, a G star that hosts three transiting planets in close proximity (a hot Jupiter, a super-Earth and a Neptune - sized planet) and a non-transiting planet at 1.4 AU.
Because the star is evolving up the sub-giant branch, K2 - 66b receives a high level... ▽ More We report precise mass and density measurements of two extremely hot sub-Neptune-size planets from the K2 mission using radial velocities, K2 photometry, and adaptive optics imaging.
As a subgiant star subject to pulsations which affect careful measurements of variations in radial velocity caused by the gravitational pull of substellar companions, astronomers would find it very difficult to detect any Earth - type planet around Beta Hydri using present methods.
[18] The internal dynamics have been analyzed using measurements of the radial velocities of 469 stars.
We present new mass measurements of three of the planets in the Kepler - 20 system facilitated by 104 radial velocity measurements from the HARPS - N spectrograph and 30 archival Keck / HIRES observations, as well as an updated photometric analysis of the Kepler data and an asteroseismic analysis of the host star (MStar = 0.948 + -0.051 Msun and Rstar = 0.964 + -0.018 Rsun).
We also used radial velocity measurements of the host star, spanning a time range of $ \ sim $ 30 yr, to constrain the companion's mass and orbital properties, as well as to probe the host star's spectral age indicators and general spectral energy distribution.
Radial velocity measurements of Alpha Centauri B with High Accuracy Radial Velocity Planet Searcher spectrograph ruled out planets of more than 4 M ⊕ to the distance of the habitable zone of the star (orbital period P = 20velocity measurements of Alpha Centauri B with High Accuracy Radial Velocity Planet Searcher spectrograph ruled out planets of more than 4 M ⊕ to the distance of the habitable zone of the star (orbital period P = 20Velocity Planet Searcher spectrograph ruled out planets of more than 4 M ⊕ to the distance of the habitable zone of the star (orbital period P = 200 days).
Follow - up radial velocity measurements with th... ▽ More We present 44 days of high duty cycle, ultra precise photometry of the 13th magnitude star Kepler - 5 (KIC 8191672, Teff = 6300 K, logg = 4.1), which exhibits periodic transits with a depth of 0.7 %.
In the EDEN / RV component we are utilizing stellar reflex motion (radial velocity measurements) to search for extrasolar planets around nearby stars.
Putting the measurements together, the team determined the star is moving at about 1,200 kilometers per second — much higher than the velocities of previously known stars in the Milky Way galaxy.
As a subgiant star subject to pulsations which affect careful measurements of radial velocity, astronomers would find it very difficult to detect any Earth - type planet arond this star using present methods.
By carefully combining position measurements from digital archives with newer positions measured from images taken during the course of the Pan-STARRS1 survey, they were able to derive the tangential component of the star's velocity (across our line of sight).
This low - mass companion was discovered using radial velocity measurements in 1996, possibly confirming Louis Berman's discovery of a spectroscopic companion to Star B in 1931.
We find that the asteroseismic parameters allow us to test cluster - membership of the stars, and even with the limited seismic data in hand, we can already identify four possible non-members despite their having a better than 80 % membership probability from radial velocity measurements.
By contrast, Hubble's measurements are based on the velocities of stars whirling around in the dense cores of globular clusters, which yield a direct measurement of the black hole masses.
This gave them 25 small planets in 12 star systems from radial velocity measurements.
By re-observing the photometric transit, we attempt to determine the transit parameters to high precision, and, by spectroscopic observations, to estimate the properties of the host star and determine the mass of the transiting object by means of radial - velocity measurements.