Foundations of Astronomy
13th Edition
ISBN: 9781305079151
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Question
Chapter 14, Problem 5DQ
To determine
The reason why the temperature of an accretion disk orbiting a giant star is than that of an accretion disk orbiting a compact object.
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the co
te
on Pictor.
The
270
TOI
System
TOI 270 c
Earth
365-day orbit
$1 AU from Sun
Habitable
5.7-day orbit
0.05 AU
$2.4 Earth radii
Largest in
system
59 F, 15 C
300 F, 150 C
TOI 270
TOI 270 d
M3-type dwarf star
TOI 270 b
$11.4-day orbit
0.07 AU
3.4-day orbit
2.1 Earth radii
0.03 AU
Temperate
1.25 Earth radii
Likely rocky
150 F. 67 C
490 F. 254 C
Figure taken from https://exoplanets.nasa.gov/news/1593/tess-scores-hat-trick-with-3-new-worlds/
What makes the TOI-270 system particularly interesting is that the three exoplanets detected this far
(there may be more) have sizes comparable to the Earth.
Compare the orbital period of TOI 270 c and TOI 270 d. For every revolution that TOI 270 d makes around
the host star TOI 270, how many revolutions does TOI 270 c make?
H5.
A star with mass 1.05 M has a luminosity of 4.49 × 1026 W and effective temperature of 5700 K. It dims to 4.42 × 1026 W every 1.39 Earth days due to a transiting exoplanet. The duration of the transit reveals that the exoplanet orbits at a distance of 0.0617 AU. Based on this information, calculate the radius of the planet (expressed in Jupiter radii) and the minimum inclination of its orbit to our line of sight.
Follow up observations of the star in part reveal that a spectral feature with a rest wavelength of 656 nm is redshifted by 1.41×10−3 nm with the same period as the observed transit. Assuming a circular orbit what can be inferred about the planet’s mass (expressed in Jupiter masses)?
If the accretion disk around a neutron star has a radius of 2 × 105 km,
what is the orbital velocity of a particle at its outer edge?
Chapter 14 Solutions
Foundations of Astronomy
Ch. 14 - Prob. 1RQCh. 14 - Prob. 2RQCh. 14 - Prob. 3RQCh. 14 - Prob. 4RQCh. 14 - Prob. 5RQCh. 14 - Prob. 6RQCh. 14 - Prob. 7RQCh. 14 - Prob. 8RQCh. 14 - Prob. 9RQCh. 14 - Prob. 10RQ
Ch. 14 - Prob. 11RQCh. 14 - Prob. 12RQCh. 14 - Prob. 13RQCh. 14 - Prob. 14RQCh. 14 - Prob. 15RQCh. 14 - Prob. 16RQCh. 14 - If the Sun has a Schwarzschild radius, why isnt it...Ch. 14 - Prob. 18RQCh. 14 - Prob. 19RQCh. 14 - Prob. 20RQCh. 14 - Prob. 21RQCh. 14 - In what sense is a black hole actually black?Ch. 14 - If you are falling into a black hole and you point...Ch. 14 - Prob. 24RQCh. 14 - Prob. 25RQCh. 14 - Prob. 26RQCh. 14 - How Do We Know? How does peer review make fraud...Ch. 14 - Prob. 1DQCh. 14 - Prob. 2DQCh. 14 - Prob. 3DQCh. 14 - Prob. 4DQCh. 14 - Prob. 5DQCh. 14 - Prob. 6DQCh. 14 - Prob. 1PCh. 14 - Prob. 2PCh. 14 - Prob. 3PCh. 14 - Prob. 4PCh. 14 - Prob. 5PCh. 14 - Prob. 6PCh. 14 - Prob. 7PCh. 14 - Prob. 8PCh. 14 - Prob. 9PCh. 14 - Prob. 10PCh. 14 - Prob. 11PCh. 14 - Prob. 12PCh. 14 - Prob. 13PCh. 14 - Prob. 14PCh. 14 - Prob. 15PCh. 14 - Prob. 16PCh. 14 - Prob. 1LTLCh. 14 - Prob. 2LTLCh. 14 - Prob. 3LTLCh. 14 - Prob. 4LTLCh. 14 - Prob. 5LTL
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- suppose a planetary nebula is 2.8 pc in diameter, and doppler shifts in its spectrum show that the planetary nebula is 33 km/s. how old is the planetary nebula? 1 pc= 3.1 ×10^13 km and 1 yr= 3.2 × 10^7sarrow_forward(Astronomy) Neutron Star Accretion Disk. If the accretion disk around a 2.25-solar-mass neutron star has a radius of 2 × 105 km, what is the orbital velocity of a particle at its outer edge in units of km⁄s? (Hint: Use the formula for circular orbit velocity) *answer in km/s*arrow_forwardIf a transit depth of 0.001 (or 0.1% decrease in brightness) is detected for a star with a radius of 0.3 RSun, what would the radius of the exoplanet be in units of RSun?arrow_forward
- Explain what makes the planetary nebula glow and what makes the supernova remnant glow. Which of these two kinds of gas clouds continues to glow for a longer time and why?arrow_forwardIf a protostellar disk is 240 AU in radius and the disk plus the forming star together contain 9 solar masses, what is the orbital speed at the outer edge of the disk in kilometers per second?arrow_forwardIf a circular accretion disk around a 1.4 M neutron Star has a radius of 5.00 x 10^5 km as measured from the center of the neutron Star to the edge of the disk, what is the orbital velocity (in km/s) of a gas particle located at its outer edge? (The mass of the Sun is 1.99 x 10^30 kg. Hint: Use the circular orbit velocity formula, Vc = GM/R ; make sure to express quantities in units, meters, kilograms, & seconds.) ________ km/sarrow_forward
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