When we are lucky enough to see an extrasolar planet transit its star:
A)it will cause the star to vanish for several hours.
B)we can find the planet's size, mass, and density by the drop in light.
C)we can determine what elements are in its atmosphere.
D)we can determine its shape.
E)we can be certain it is a terrestrial, not a jovian.

Question

Quizplus · Accepted Answer

When an extrasolar planet transits its star, it causes a small but measurable drop in the star's brightness. By analyzing this drop in light, astronomers can determine the size of the planet and its distance from the star. Using this information, they can estimate the planet's mass and density. However, it is not possible to determine the planet's shape or whether it is terrestrial or jovian simply from observing its transit. And while analyzing the spectrum of the star's light during the transit can reveal some information about the planet's atmosphere, it is not always possible to do so. When an extrasolar planet transits its star, it causes a drop in the star's brightness. By measuring the size of the planet's shadow and how long it takes to cross the star, we can determine the planet's size and orbital period. By analyzing the amount and shape of the drop in light, we can also infer the planet's mass and density. This allows us to classify whether the planet is a terrestrial or a jovian. However, it is currently difficult to determine the exact elements in a planet's atmosphere during a transit observation.

When We Are Lucky Enough to See an Extrasolar Planet