Hot and cold… two exoplanets with very different environments, the colder planet “GJ 15 A c”[صورة الفضاء اليوم]| sorae space portal site

[SAPOD]We present to you today’s space photos. We present featured images submitted by sorae in the past, eye-catching images released by space agencies around the world, and images submitted by space astronomy enthusiasts and experts. (There is a link to the original article at the end of the article)

(reference element: sorae)

This is the “exoplanet ‘GJ 15 A c'” provided by sorae in the article dated October 17, 2019.imaginationHe is.(*The orb at the bottom right is the satellite “GJ 15 A c”)

on Oct. 16, 2019, from NASA’s Exoplanet Exploration Program, while orbiting the same starTwo outer planets with radically different environmentsIt was a prelude. It orbits the red dwarf “GJ 15 A”, located 11 light-years from Earth.Exoplanets “GJ 15 A b” and “GJ 15 A c”He is.

Inner GJ 15 A b is classified as a “super-Earth” with nearly three times the mass of Earth. It has a tropical period of only 11 days and its surface temperature is estimated to be over 270°C.

GJ 15 A c is about 36 times the mass of Earth (about 1/9 the mass of Jupiter and about twice the mass of Neptune) and is thought to be a gaseous planet. The orbital period is about 20 years, and the surface temperature is considered very low because it is far from the main star.

The presence of these two exoplanets around GJ 15 A can be determined by ‘a method for detecting the slight oscillation of the main star in a circular motion in front, back, left and right according to the planet’s orbit’ (radial velocity method).

In the original article, I also touched on the “main star wobble” that made it possible to detect “GJ 15 B”, which forms a binary star with the red dwarf “GJ 15 A” and “GJ 15 A c”.

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