Discuss what you have learned about Exoplanets today. How hard are they to detec

Question

Discuss what you have learned about Exoplanets today. How hard are they to detect, and what are the main techniques astronomers use to find them? Write using complete sentences and proper grammar. You have obtained a radial velocity curve for a transiting exoplanet that orbits the star 18 Scorpii, which is referred to as a "solar twin"(that is, identical in every way to the Sun). The planet has an orbital period of 40 days. The maximum reflex velocity of the star 18 Scorpii is 1 m/s. What is the mass of this exoplanet? You are going to use equations #4 and #5, and the mass (listed in Exercise #4) and radius (from Exercise #1) of the Sun. Remember that you must use a consistent set of units. In equation #4 "G" is listed in "mks". Thus, the period of the exoplanet, must be converted from days to seconds, and the mass and radius of the Sun must be in kilograms and meters, respectively, to correctly use equations #4 and #5. Compare the mass of this exoplanet to the mass of the Earth (6.0 times 10^cap24kg). Show your work. As we noted, the exoplanet around 18 Scorpii is also a transiting system, and F/F = 4.8 times 10|^cap 4. Calculate the radius of this planet (like those in Exercise #3). Compare it to the radius of the Earth. What is the density of this planet in kg/m^3? Compare this to the density of the Earth (5, 511 kg/m^cap3), and Jupiter (1, 326 kg/m^cap3). Is "18 Scorpii B" more like a Terrestrial planet, or a Jovian planet? Show your work.

Explanation / Answer

1) An exoplanet is a planet which will orbit a star except the sun.

These are also called as extrasolar planets.

These exoplanets are very big in size.

Some very big exoplanets are very close to the parent stars.

After the detection of exoplanets, the scientists started to search for extraterrestrial life.

Exoplanets are very hard to detect directly because they are less brighter than the stars around which they are orbiting and they shine based on the light reflected from the stars around which they are orbiting.

Techniques used by astronomers to detect exoplanets

These are all indirect methods of detection of exoplanets.

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