Question 1 1 pts
The star Qo’noS shines most brightly at 415 nanometers. Use Wien’s Law to calculate the star’s surface temperature.
What is the surface temperature of Qo’noS?
Group of answer choices
4110 K
5220 K
6990 K
8670 K
Flag question: Question 2
Question 2 2 pts
Open the NAAP Radial Velocity simulator. Set the inclination and longitude of the system to 90 and 45 degrees, respectively. Then, slide the stellar mass bar until the star’s description matches the temperature you just calculated.
What is the spectral type, mass, and radius of the star Qo’noS?
Group of answer choices
K7V, 0.5 Msun, 0.5 Rsun
K0V, 0.82 Msun, 0.8 Rsun
F0V, 1.37 Msun, 1.3 Rsun
A3V, 1.91 Msun, 1.6 Rsun
Flag question: Question 3
Question 3 2 pts
The radial velocity and transit data provided both indicate the presence of an exoplanet in this system; astronomers have named it Praxis.
Based on the radial velocity data for Qo’noS, what is the orbital period of Praxis?
Group of answer choices
23 hours
35 hours
50 hours
64 hours
Flag question: Question 4
Question 4 2 pts
Slide the semi-major axis bar in the simulator until the system period matches what you determined for Praxis. You can be more precise by typing values into the semi-major axis text box.
What is the semi-major axis of this exoplanet’s orbit?
Group of answer choices
0.028 AU
0.045 AU
0.308 AU
0.720 AU
Flag question: Question 5
Question 5 2 pts
The symmetry of our radial velocity data tells us that Praxis has a circular orbit. Slide the eccentricity bar to 0. Then, slide the planet mass bar until the amplitude of the simulator graph is consistent with the observed data.
What is the mass of Praxis?
Group of answer choices
0.8 Mjupiter
2 Mjupiter
5 Mjupiter
9 Mjupiter
Flag question: Question 6
Question 6 2 pts
Next, turn your attention to the NAAP Transit simulator. Set the inclination, longitude, stellar mass, planet mass, semi-major axis, and eccentricity parameters so that they match those from your radial velocity simulator.
Based on the transit curve of Qo’noS, what is the depth of the transit signal? (This is the difference between the usual flux and transit flux.)
Group of answer choices
0.002
0.008
0.017
0.025
Flag question: Question 7
Question 7 2 pts
Slide the planet radius bar in the transit simulator until the eclipse depth shown below the graph matches the value you just calculated.
What is the radius of Praxis?
Group of answer choices
0.56 Rjupiter
1.13 Rjupiter
1.64 Rjupiter
2 Rjupiter
Flag question: Question 8
Question 8 2 pts
Use your planet mass and planet radius to calculate the density of Praxis. You will need to convert these values to kilograms and meters respectively. For your conversions, you can assume the mass of Jupiter is 1.9 x 1027 kilograms and the radius of Jupiter is 7 x 107 meters.
The density of a planet is given by the following equation where the planet mass is in kilograms, planet radius is in meters, and planet density is in kilograms per cubic meter.
=43 3
=
What is the average density of this planet? What common substance on Earth is this comparable to?
Group of answer choices
1,000 kg/m3, water
2,700 kg/m3, aluminum
7,800 kg/m3, iron
11,300 kg/m3, lead
19,300 kg/m3, gold
