Astronomers Believe That the Atmosphere of the Desolate World was Completely Destroyed.

 

Illustration of GJ 1252 b. (NASA/JPL-Caltech)

What would happen if you put a planet the size of Earth in close proximity to an M-dwarf star? M dwarfs are the most abundant stars we know of, so it's more than just a academic question.

The answer was discovered by a group of astronomers investigating the planet GJ 1252b, and it is not pretty.

This planet receives a lot of heat because it is so close to its star. Additionally, there is another danger posed by proximity.

Michelle Hill, a University of California Riverside astrophysicist and co-author of a recent paper on GJ 1252b, stated, "The pressure from the star's radiation is immense, enough to blow a planet's atmosphere away."

The planet orbits its star twice every 24 Earth hours and is 65 light-years away. This planet is inhospitable due to the star's heat.

Illustration of the atmosphere being blown away from a planet by a nearby star. (NASA)

Mercury is very similar to this in our solar system. As it orbits the Sun, the planet is both heated and frozen due to the absence of an atmosphere. Actually, solar activity also causes a small loss of Earth's atmosphere.

However, gases are reintroduced into the atmosphere through volcanism and other processes. Earth is blessed; Not planets like Mercury or GJ 1252b.Furthermore, this has significant repercussions for the search for life-friendly worlds.

What is it about M Dwarf Stars?

Our galaxy alone contains millions upon millions of M dwarf stars. They are anywhere from one tenth to two thirds of the Sun's mass in size. Flares and outbursts can be sent through their systems by these when they are active. The majority contain at least one planet within their habitable zones, as well as others at various distances.

If you want to discover life on their planets, that is not the best combination. It goes without saying that the stellar activity that destroys planet atmospheres also wipes out any chance of life on those worlds.

Additionally, the widespread presence of M dwarfs may reduce the number of planets in the galaxy that actually DO support life. Planets like GJ 1252b are not going to like that.

Hill stated, "It's possible this planet's condition could be a negative sign for planets even further away from this type of star."

"The James Webb Space Telescope, which will be looking at planets like these, will teach us this,"

There is some good news despite the possibility that M dwarfs will destroy the atmosphere.

M dwarfs make up many of the 5,000 stars near Earth's solar system. Even if a large number of them destroy their planets to the point where they are uninhabitable, at least 1,000 others—not all of which are M dwarfs—may create conditions that are conducive to life.

"A planet may still have an atmosphere if it is sufficiently far from an M dwarf. Hill stated, "We cannot yet conclude that all rocky planets around these stars succumb to Mercury's fate."

"I continue to have hope."

Looking for an Atmosphere on GJ 1252b

The scientific explanation for the situation at GJ 1252b is fascinating. Data from the Spitzer Space Telescope were used by astronomers to evaluate the planet's infrared radiation as a secondary eclipse obscured its light.

The planet is blasted by the star, according to the measurements. Surface temperatures during the day average around 1,227 degrees Celsius. That is scorching hot enough to melt copper, gold, and silver.

The researchers assumed there was no atmosphere because of the heat and the assumed low surface pressure. However, let's pretend for a second that the atmosphere contained carbon dioxide. That would hold heat on the surface and possibly permit that blanket to remain in place for some time.

GJ 1252b, on the other hand, doesn't have it so good, it turns out.

Without an atmosphere, the planet could have 700 times more carbon than Earth does. According to UCR astrophysicist and study co-author Stephen Kane, "it would build up initially, but then taper off and erode away."

If this study is correct for a large number of M dwarf stars, the search for habitable planets will shift to other candidates around stars that are less volatile in the long run.

This article was originally published by Universe Today.