Sentences with phrase «velocity measurements of»

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 = 200 days).

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.

Tracking relative motions within the volume, though, is tough; it requires distance and velocity measurements of high precision.

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.

Not exact matches

Measurement of Hydrodynamic Growth near Peak Velocity in an Inertial Confinement Fusion Capsule Implosion using a Self - Radiography Technique

Measurements of collective fuel velocities in deuterium - tritium exploding pusher and cryogenically layered deuterium - tritium implosions on the NIF

At one point Fizeau's measurement of the velocity of light in water seemed a conclusive refutation of the corpuscular theory of light; but the latter returned, in a new form, in Einstein's theory of photons.

If nothing is found wrong with this neutrino - velocity measurement, then of course the modern understanding of physics is thrown entirely «up in the air.»

There must have been something wrong with Jackson's velocity measurements because there is no way he has the weakest arm of that bunch.

Precise measurements of their velocities, ages and distances would allow astronomers to trace the stellar fugitives back to their homes, even on the far side.

As detailed in this video, Laniakea's discovery emerged from measurements of galactic positions and velocities that reveal how galaxies are moving in relation to concentrations of nearby matter and the universe's overall expansion.

Semantic Scholar tries to reveal what's «hot» in the field by measuring the «velocity» and «acceleration» of bodies of work, measurements of how rapidly others are citing certain work, and whether that is trending.

The inset diagram at bottom left shows the measurement of gas moving toward and away from Earth, indicating the material is traveling at a high velocity.

The velocity measurement is «a great step forward,» says Douglas Finkbeiner of Harvard University, one of the astronomers who discovered the Fermi bubbles.

«If you really want to have a precise mass measurement of the black hole in a specific galaxy, you'd better use the slightly more cumbersome velocity dispersion method,» Ferrarese says.

In 1929 Edwin Hubble used these velocities and his own measurements of these galaxies» distances from Earth to deduce that the Universe is expanding.

These two figures show the internal waves at Dongsha Island on April 23, 2010, as seen by the radar on TerraSAR - X in its conventional mode of operation (left) and in the experimental new mode that permits direct velocity measurements (right), with the measured surface velocities shown in color.

To model the projected impact of climate change on marine biodiversity, the researchers used climate - velocity trajectories, a measurement which combines the rate and direction of movement of ocean temperature bands over time, together with information about thermal tolerance and habitat preference.

Estimates of data like temperature and wind velocity also had to be used in some border areas, which were under control of FARC (the Revolutionary Armed Forces of Colombia) and were not easily accessible for measurements, he adds.

Experts urged caution, especially because an earlier measurement of neutrino velocity had indicated, to high precision and accuracy, that neutrinos do respect the cosmic speed limit.

However, no data on airflow velocity measurement or research on the influence of AC airflow have been available.

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.

The research team, led by professor Kazuyo Tsuzuki, had the subjects sleep in two bedrooms set to the same temperature using ACs set at different airflow velocities, then made a comparison of the depth of sleep and body temperature control using electroencephalogram (EEG) measurements as well as subjective reporting by the subjects.

Right: A Doppler measurement of velocity, with winds exceeding 135 miles per hour.

Kopeikin and Fomalont's experiment, they said, was merely an inaccurate measurement of light's velocity.

This measurement is also a gauge of the black hole's velocity, because the gas is gravitationally locked to the monster object.

The researchers took measurements of small - scale temperature and velocity fluctuations, to measure the diapycnal movements in the Antarctic Circumpolar Current (ACC) across the Drake Passage region of the Southern Ocean.

NSCAT will provide regular measurements of ocean surface wind velocity from space.

«When the electron comes out, we measure its energy and velocity, and what we found is that electrons coming out of the cadmium arsenide had measurements that were similar to what is seen in particles that are massless,» Neupane said.

Laughlin says it's frustrating that the most interesting planets — small ones like Earth — are so challenging to detect: «You have to get tons and tons and tons of velocity measurements over many years, and then you really, really have to take extreme care — as this Tuomi et al. paper does — to get rid of all the systematic noise.»

However, this would require measurements of Doppler velocity drifts of ∼ 1 centimeter per second per year, and astronomical spectrographs have not yet been calibrated to this tolerance.

These seismic measurements enabled scientists to visualize these ultralow velocity zones in some regions along the core - mantle boundary, by observing the slowing down of seismic waves passing through them.

In July 2008, astronomers (Michael Endl and Martin Kürster) analyzed used seven years of differential radial velocity measurements for Proxima Centauri to submit a paper indicating that large planets are unlikely to be orbiting Sol's closest stellar neighbor within its habitable zone — around 0.022 to 0.054 AU with a corresponding orbital period of 3.6 to 13.8 days.

Still, many of the nearby planets are detectable via three exoplanet hunting methods: planetary transits, high - contrast imaging, and stellar radial velocity measurements.

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, 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.

Even though the radial velocity method can only give some rough measurements of an exoplanet's properties, like minimum mass and orbital period, it nevertheless allows astronomers to make some educated guesses regarding the planet's overall structure.

Measurements of Gl 105A's radial velocity over 12 years show a linear trend and slope which is consistent with these orbital constraints and a nearly face - on orbit.

Based on 14 years of radial velocity observations from four ground - based observatories as well as astrometric measurements with the Hubble Space Telescope, the astronomers found that planets «c» and «d» are inclined by 30 + / - 1 degrees with respect to each other is expected to affect theories of how multi-planet systems evolve.

I. Performances of radial velocity measurements, first analyses of variations.

Based on astrometic as well as high - cadence radial velocity measurements, planetary candidate «c» appears to have around 14.0 +2.3 / -5.3 times the mass of Jupiter (McArthur et al, 2010).

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.

It has at least 3.75 times Jupiter's mass, but subsequent astrometic as well as high - cadence radial velocity measurements suggest that planet d may have 10.25 +0.7 / -3.3 times the mass of Jupiter with an inclination of 155.5 ° from Earth's line of sight (McArthur et al, 2010); Han et al, 2000; and Mazeh et al, 1999).

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.

The initial transit signal was identified in KELT - North survey data, and the planetary nature of the occulter was established using a combination of follow - up photometry, high - resolution imaging, high - resolution spectroscopy, and precise radial velocity measurements.

We then measured the planet mass by acquiring twelve radial velocity (RV) measurements of the system using HIRES on the 10 - m Keck I Telescope.

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.

The planet has an orbital period of 1.486 days, and radial velocity measurements from the Hobby - Eberly Telescope (HET) show a Doppler signal of 420 + / -15 m.s - 1.

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.