Astronomy Chapter 13

The first planets around other Sun-like stars were discovered

Approximately how many other planetary systems have been discovered to date?

Which of the following methods has led to the most discoveries of massive planets orbiting near their parent stars?

Which of the following methods has not yet detected planets around other stars?

Most of the planets discovered around other stars

How much brighter is a Sun-like star than the reflected light from a planet orbiting around it?

What is astrometry

By itself, the Doppler technique provides a measure of a planet's

Planets detected via the Doppler technique have been mostly

Current techniques can measure stellar motion to less than

A planet's density can be measured by combining

The composition of a planet can be determined by

The size and shape of a planet's orbit can be determined by

The astrometric technique of planet detection works best for

The transit method of planet detection works best for

The reason that most extrasolar planets are found close to their parent stars is

The Doppler technique only provides a measure of the minimum mass of a planet because

Which planet can we see occasionally transit across the face of the Sun

Which planet search technique is currently best suited to finding Earth-like planets?

What are the two main differences between extrasolar planetary systems discovered to date and our Solar System?

A planet is detected via the Doppler technique. The velocity change of the star is a measure of

A planet is detected via the Doppler technique. The repeating pattern of the stellar motion tells us

A planet is detected via the Doppler technique. The shape of the periodic velocity pattern tells us

The depth of the dip in a star's brightness due to the transit of a planet depends most directly on

Why are many of the newly detected extrasolar planets called "hot Jupiters

The composition of a planet's atmosphere be measured during a transit by analyzing

What do models suggest make up the clouds on "hot Jupiters"?

How do we think the "hot Jupiters" around other stars were formed

What would happen to the planets in a solar system where the central star did not have a strong wind?

Which of the following is a consequence of the discovery of hot Jupiters for the nebular theory of solar system formation?

Which of the following is a consequence of the discovery of hot Jupiters for understanding our own Solar System?

Viewed from afar, the transit of Earth would cause the Sun's brightness to dim by approximately one part in

If every star had an Earth-like planet in an Earth-like orbit, how many could be detected by a transit?

Astronomers have discovered more planets around other stars than in our Solar System

Most of the planets discovered around other stars are more massive than Jupiter.

The Doppler technique for planet detection has found Earth-like planets around nearby Sun-like stars.

Planetary orbits that are face-on to our line of sight produce no Doppler shift in the stellar spectrum.

The density of a planet can be determined by combining Doppler and astrometric measurements.

A planet's size can be determined by observing its transit across a star

Transits of multiple planet systems can be analyzed to infer planetary masses

Multiple-planet systems have been identified around other stars via the Doppler technique

Because we have not found another planetary system like our own, we can conclude that our Solar System must be quite unusual.

Once a planet forms in a disk-like nebula around a star, its orbit is fixed and will never change.

Multiple planets have been identified around other stars via the transit technique

The signature of a planet is largest in radial velocity measurements when the planet and star are lined up along the line of sight to the telescope

The signature of a planet is largest in transit measurements when the planet and star are lined up along the line of sight to the telescope.

The total amount of light from a star-planet system drops when the planet goes behind the star.

What is an extrasolar planet

About how many extrasolar planets have been discovered (as of 2008)?

As of 2008, most known extrasolar planets have been discovered by

What information does the Doppler technique give about an extrasolar planet

Why do we say that the Doppler technique gives the planet's "minimum mass"?

Which detection techniques can find the planet's orbital distance (assuming we know the mass of the star)?

Which of the following statements is not true about the planets so far discovered around other stars?

What is the closest that extrasolar planets have been found to their stars

Based on available data, what kind of objects in our solar system do most of the known extrasolar planets resemble

How are the orbits of extrasolar planets different from the orbits of planets in our solar system?

Which new idea has been added into our theory of solar system formation as a result of the discoveries of extrasolar planets

How will the Kepler mission (scheduled for 2008 launch) look for planets around other stars?

How do we expect that the first Earth-sized extrasolar planets will be discovered (if they exist)?

In essence, most of the extrasolar planets discovered to date have been found by

Why is it so difficult to take pictures of extrasolar planets

The astrometric technique looks for planets with careful measurements of a star's

Suppose you are using the Doppler technique to look for planets around another star. What must you do?

In general, which type of planet would you expect to cause the largest Doppler shift in the spectrum of its star

Suppose a planet is discovered by the Doppler technique and is then discovered to have transits. In that case, we can determine all the following about the planet except

You observe a star very similar to our own Sun in size and mass. This star moves very slightly back and forth in the sky once every four months, and you attribute this motion to the effect of an orbiting planet. What can you conclude about the orbiting planet?

All the following statements about known extrasolar planets are true. Which one came as a surprise to scientists who expected other solar systems to be like ours?

Which of the following is not expected for a "hot Jupiter" that orbits 0.05 AU from its star?

Based on everything you have learned about the formation of our solar system, which of the following statements is probably not true?

To date, we've found very few planets orbiting their stars at distances comparable to the distances of the jovian planets in our solar system. Why do astronomers think this is the case?

Current evidence suggests that many massive jovian planets orbit at very close orbital distances to their stars. How do we think these planets ended up on these close orbits?

Assuming that our ideas about how "hot Jupiters" ended up on their current orbits are correct, why didn't our own solar system end up with any hot Jupiters?

When is the soonest we are likely to have images and spectra of Earth-like planets around other stars?