Doppler spectroscopy

(redirected from Wobble method)

Doppler spectroscopy

[‚däp·lər spek′träs·kə·pē]
(spectroscopy)
A technique for measuring the speed with which an object is moving toward or away from the observer by measuring the amount that light from the object is shifted to a higher or lower frequency by the Doppler effect.
Mentioned in ?
References in periodicals archive ?
The mass of EBLM J0555-57Ab was established via the Doppler, wobble method, using data from the CORALIE spectrograph.
Cold Jupiters are just beginning to reach detectability by the wobble method, as technology improves and the time span covered by radial-velocity monitoring lengthens.
The discovery was made using the radial velocity or wobble method, which relies on Keck's High Resolution Echelle Spectrometer (HIRES) to spread light collected from the telescope into its component wavelengths or colors, producing a spectrum.
Researchers have previously used astrometry to measure the precise mass of planets found with the wobble method, but this is the first time the technique has been used to discover an extrasolar planet, says Man Boss of the Carnegie Institution for Science in Washington, D.
The researchers used the radial velocity or wobble method, which relies on Keck's High Resolution Echelle Spectrograph, or HIRES instrument, to spread light collected from the telescope into its component wavelengths or colors, in order to find the planet.
The technique offers a key advantage over the wobble method, which reveals both transiting and nontransiting planets but provides only their minimum mass and the time it takes to orbit.
Charbonneau came not only with enthusiasm but also with some intriguing information: An international team of astronomers had just used the wobble method to find tentative evidence of a giant, Jupiterlike planet circling close to a near-Earth star called HD 209458.
But the wobble method reveals only the minimum mass of an orbiting planet and nothing about its size or density.
But the wobble method provides only a planet's maximum mass.
Whereas the wobble method permits them to infer only the minimum mass of a planet, transits reveal its exact mass and radius.
The transit method, which requires a special alignment among the planet, the star, and Earth, provides enough information to yield the planet's actual mass, but the wobble method doesn't.