What is a major limitation in the Doppler method for detecting extrasolar planets?
The major limitation with Doppler spectroscopy is that it can only measure movement along the line-of-sight, and so depends on a measurement (or estimate) of the inclination of the planet's orbit to determine the planet's mass.
What is the limitation of the transit method?
Disadvantages. The main difficulty with the transit-photometry method is that in order for the photometric effect to be measured, a transit must occur. Not all planets orbiting other stars transit their stars as seen from Earth; a distant planet must pass directly between its star and Earth.
What are the advantages of using the Doppler technique to detect exoplanets?
The Doppler technique is a good method for discovering exoplanets. It uses the Doppler effect to analyze the motion and properties of the star and planet. Both the planet and the star are orbiting a common center of mass.
What advantages are gained if a planet can be detected by both methods?
Advantages gained if a planet can be detected by both methods. If a planet can be detected by both methods, then we can find its density, an indication of its composition.
What are the limitations of finding exoplanets?
challenges, as planets are orders of magnitudes fainter, less massive and smaller than the stars they orbit. Multiple detection techniques exist, all relying on the high accuracy measure- ment of stellar light (flux, spectra, position or wavefront).
What is the Doppler method?
Doppler spectroscopy is used to detect the periodic velocity shift of the stellar spectrum caused by an orbiting giant planet. (This method is also referred to as the radial velocity method.)
What is an advantage of the transit method?
The main advantage of the transit method is that the size of the planet can be determined from the light curve. When combined with the radial-velocity method (which determines the planet's mass), one can determine the density of the planet, and hence learn something about the planet's physical structure.
What is a disadvantage of the transit method quizlet?
The transit method has the advantage of yielding a planet's size. Its disadvantage is that few planets have the necessary orbital alignment to even be detectable.
What are the main limitations of the radial-velocity method for detecting exoplanets?
Drawbacks. It is a fundamental feature of the radial-velocity method that it cannot accurately determine the mass of a distant planet, but only provide an estimate of its minimum mass. This is a serious problem for planet hunters, because mass is the leading criterion for distinguishing between planets and small stars.
Which method has successfully detected the most exoplanets?
Which detection method has discovered more exoplanets so far? Radial Velocity (RV) methods are very successful, responsible for most planet discoveries to date.
What are the main limitations of the radial velocity method for detecting exoplanets?
Drawbacks. It is a fundamental feature of the radial-velocity method that it cannot accurately determine the mass of a distant planet, but only provide an estimate of its minimum mass. This is a serious problem for planet hunters, because mass is the leading criterion for distinguishing between planets and small stars.
What is one of the primary limitations of the indirect techniques of detecting exoplanets?
One of the biggest disadvantages of this method is that the light variation effect is very small. A Jovian-mass planet orbiting 0.025 AU away from a Sun-like star is barely detectable even when the orbit is edge-on.
Why is the transit method valuable?
The planets that have been studied using both of these methods are by far the best-characterized of all known exoplanets. In addition to revealing the diameter of planets, Transit Photometry can allow for a planet's atmosphere to be investigated through spectroscopy.
What can the Doppler method tell us?
What can Doppler shifts tell us? Doppler shift data tell us about a planet's mass and the shape of its orbit. We cannot measure an exact mass for a planet without knowing the tilt of its orbit, because Doppler shift tells us only the velocity toward or away from us. Doppler data give us lower limits on masses.
Why is the astrometry method more difficult than the Doppler method?
Astrometry is more difficult because distant stars move an extremely small amount as viewed from Earth, so it is difficult to measure that motion.
Why is the astrometry method more difficult than the Doppler method quizlet?
Why is the Astrometry method more difficult than the Doppler method? Astrometry is more difficult because distant stars move an extremely small amount as viewed from Earth, so it is difficult to measure that motion.
What does the Doppler method measure?
Doppler spectroscopy is used to detect the periodic velocity shift of the stellar spectrum caused by an orbiting giant planet. (This method is also referred to as the radial velocity method.)