The astrometric technique of planet detection works best for

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Consider the question: 'The astrometric technique of planet detection works best for'.
Since the provided answer indicates 'massive planets around nearby stars' as the correct choice, we can reason why this is the case and also note the absence of other options.
First, astrometry measures the tiny wobble in a star's position on the sky caused by the gravitational tug of an orbiting planet. This method is most sensitive when the star exhibits a relatively large reflex motion, which occurs most prominently when a planet has a substantial mass and orbits relatively close to the star, within the realm where the star experiences a measurable wobble over observable timescales.
Second, proximity matters because angular displacements translate into smaller shifts for distant stars. Nearby stars allow the same physical wobble to correspond to a larger angular shift on the sky, improving detectability. Therefore, a nearby, massive planet induces a more easily detectable astrometric signal than a small planet or a faraway system.
Third, the orbit must be such that the planet’s gravitational influence yields a persistent, trackable wobble over the timespan of observations. Massive planets around nearby stars typically present the strongest and most regular astrometric signatures, aligning with the stated option.
Now, addressing the absence of other answer options: without the alternatives provided, we cannot critique specific alternatives. However, in general, astrometry is least favorable for detecting very low-mass, distant, or perpendicular-orbit configurations where the star’s sky-projected motion is small or cycles slowly, which would weaken the method’s effectiveness relative to the highlighted scenario.
In summary, the reasoning behind the statement hinges on the core astrometric principle: the signal increases with planet mass and with proximity of the system, because both lead to larger and more detectable stellar positional shifts over practical observation timescales.

COS SPR 25 class 2 Feb 25 Ch 13: Other Planetary Systems

The astrometric technique of planet detection works best for

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