Sentences with phrase «radial velocity studies»

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Meanwhile, a study to be published in Astrophysical Bulletin that used just the radial velocities of stars found, similar to Moni Bidin's team, that much less dark matter than expected was required to explain the motions of stars in the local universe.

The study culminates many years of effort by an international team of scientists who have discovered a large number of the satellite galaxies, developed new techniques to measure their distances, and have used the Keck Observatory with colleagues to measure their radial velocities, or Doppler shifts (the speed of the galaxy relative to the Sun).

A companion study led by Dr. Francesco Pepe (University of Geneva, Switzerland) used the same Kepler data but independent radial velocity observations and is being published in the same issue.

To date, there have been thr... ▽ More Proxima Centauri has become the subject of intense study since the radial - velocity discovery by Anglada - Escud \» e et al. 2016 of a planet orbiting this nearby M - dwarf every ~ 11.2 days.

Abstract: Proxima Centauri has become the subject of intense study since the radial - velocity discovery by Anglada - Escud \» e et al. 2016 of a planet orbiting this nearby M - dwarf every ~ 11.2 days.

[106] Theoretical studies on the detectability via radial velocity analysis have shown that a dedicated campaign of high - cadence observations with a 1 - meter class telescope can reliably detect a hypothetical planet of 1.8 M ⊕ in the habitable zone of B within three years.

Subsequent studies failed to resolve a companion star, both by speckle interferometry (Hartkopf and McAlister, 1983) and by radial velocity analysis (Marcy and Benitz, 1989).

By far the most successful technique for finding and studying extrasolar planets has been the radial velocity method, which measures the motion of host stars in response to gravitational tugs by their planets.

The radial gradient of sap velocity in these trees was quantified in an earlier study (Cohen et al. 2008), indicating a quasi-linear decrease from maximum sap velocity at 5 mm below the cambium down to zero at 40 mm.