LTT 9779 b is an exo-Neptune that has kept its atmosphere despite being close to its star. It orbits a G-type star about 260 light years away. It has 29 Earth masses and is only 0.01679 AU from its star. It takes only 0.8 of a day to complete an orbit. 

Astronomers think that Neptune-size planets orbiting close to their stars aren’t massive enough to retain their atmospheres. The stars’ powerful radiation strips away the atmosphere. 

Something unusual must be happening for LTT 9779 b to hang onto its atmosphere in such close proximity to its star.

It has 29 Earth masses, and has retained its atmosphere despite being only 0.01679 AU from its star and taking only 0.8 of a day to complete an orbit. In this situation, the star’s overwhelming radiation should have simply removed the planet’s atmosphere

LTT 9779 b is an exoplanet that orbits the star LTT 9779, which is about 262.9 light-years away from the Solar System. It was discovered in 2020 using TESS. 

LTT 9779 b is an ultra-hot Neptune with the following characteristics: 

• Mass of 29.32 Earths 
• Radius of 4.7 times the Earth’s radius 
• Orbital period of less than a day 
• Distance from its star of 0.01679 AU 

LTT 9779 b is one of the few known planets in the Neptunian desert. It orbits incredibly close to its parent star, completing an orbit every 19 hours. At those distances, temperatures are high enough that astronomers predict clouds made of liquid titanium, raining scorching metal onto the planet’s surface. 

LTT 9779 b kept its atmosphere thanks to an unusually X-ray faint host star

When was LTT9779 b discovered?

2020

LTT 9779 b is a Neptune-like exoplanet that orbits a G-type star. Its mass is 29.32 Earths, it takes 0.8 days to complete one orbit of its star, and is 0.01679 AU from its star. Its discovery was announced in 2020

What is the new exoplanet with metal clouds?

An ultrahot exoplanet that zips around its host star every 19 hours is the shiniest exoplanet ever discovered. The scorching world, dubbed planet LTT9779b, has reflective metallic clouds made of silicates and metals like titanium

LTT 9779 b is located about 264 light-years from Earth. It orbits its star much closer than Earth orbits the Sun. The planet completes one orbit every 19 hours. 

LTT 9779 b is covered by reflective clouds of metal. It reflects around 80% of the light that shines on it from its parent star.  The planet’s high reflectiveness, also called Albedo, is a conundrum. Most planets and moons have a low Albedo because they absorb light rather than reflect it. 

LTT 9779 b is the brightest planet in our solar system. It’s covered in reflective clouds of metal, and reflects around 80% of the light that shines on it from its parent star. By comparison, only 30% of our sun’s light bounces off Earth. 

LTT 9779 b’s atmosphere is so saturated with metals and silicate vapors that droplets form, including raindrops composed of titanium. Astronomers predict that clouds made of liquid titanium rain scorching metal onto the planet’s surface. 

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