Please help me 1. Which detection method or methods measure the gravitational tu

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Please help me

1. Which detection method or methods measure the gravitational tug of a planet on its star, allowing us to estimate planetary mass? (B)

A. the transit method only B. the Doppler method only C. the astrometric and Doppler methods

2. What is the transit method of finding extrasolar planets? (C)

A. monitoring a star to detect periodic dips in its brightness from the planet passing in front of the star

B. measuring the spectrum of the star for a periodic variation in its Doppler shift

C. monitoring a star to detect periodic dips in its brightness from the planet passing behind the star

D. observing a star during the rare occasion of another star passing directly in front of it; slight changes in how the light is bent by gravity can indicate the presence of planets around the closer star

3. How does a hot Jupiter differ from Jupiter? (A)

A. It's much more massive.

B. It has a much longer year.

C. It's much closer to its star.

4. Star X has an apparent magnitude of 3, and star Y has an apparent magnitude of 13. How do they compare in observed brightness? (D)

A. Star X is 10 times brighter than star Y.

B. Star Y is 10,000 times brighter than star X.

C. Star X is 10,000 times brighter than star Y.

D. Star Y is 10 times brighter than star X.

Explanation / Answer

1.(C) Astrometric and Doppler methods measure motion caused by the gravitational tug of a planet on a star and both can help us measure and estimate planetary mass.

2.(A) When a planet crosses in front of its star as viewed by an observer, the event is called a transit. Transits by terrestrial planets produce a small change in a star's brightness of about 1/10,000 (100 parts per million, ppm), lasting for 2 to 16 hours.

3.(C)it has a Jupiter like mass but a much higher surface temperature due to close proximity of its system sun

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