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Prof. W Astro 1504 Midterm 2 Exam
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Prof. W Astro 1504 Midterm 2 ExamHow do stars form?
The collapse of a cold clump of molecular gas with the core collapsing faster than
the outer regions
protoplanetary disk
a collection of mainly gas and some dust which guides the accretion of matter onto
a protostar and serves as the birthplace of planets
The horsehead nebula, a famous molecular cloud, is composed primarily of:
hydrogen gas
Clumps of gas will collapse to form stars when:
Gravitational forces exceed the local gas pressure
The Tarantula Nebula is a famous HII region. What is the easiest way to detect this
nebula with a telescope
Via emission line spectroscopy, or via imagery that is sensitive to emission lines
What is one common way that astronomers identify new protoplanetary disks?
by measuring an infrared excess around a source
The cores of planets forming inside (interior to) a protoplanetary disk system's
"snow line" are mainly comprised of:
Dust
7-12 million years
Based on the observed lifetimes of protoplanetary disks in this figure, what is the
maximum time scale for the formation of gas giant planets?
The amount of starlight blocked during an extra-solar planet transit event tells
astronomers about what properties of the planet?
, the planet's radius
Red shifted
If you are performing a radial velocity planet survey and take a spectrum of this
system at this instance in time, the spectrum you would obtain would have:
The cores of planets forming outside (exterior to) a protoplanetary disk system's
"snow line" are mainly comprised of:
Dust and ice
place the steps of the core accretion theory for forming a rocky planet in the correct
chronological order from start to finish
Collisional build-up of dust grains, formation of planetesimals in the midplane,
constructive collisions of planetesimals, differentiation
the steps of the core accretion theory for forming a gas giant planet in the correct
chronological order from start to finish?
Collisional build-up of dust grains, formation of planetesimals in the midplane,
constructive collisions of planetesimals, rapid accumulation of gas after the core
reaches a mass of 10x Earth's mass, differentiation
Which planet detection technique does not involve directly measure the
gravitational influence between a star and planets orbiting that star?
Direct imaging
Where in protoplanetary disks do planets form?
Midplane
C
Which panel shown above provides the BEST observational evidence for the
existence of planetary migration?
A
Which panel shown above illustrates a trend that is expected from the core
accretion theory's basic premise that planetary cores/planets grow from collisional
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