Moreover,
Hectic young star literally evaporates:
We discovered an exoplanet so close to its star that the winds. Furthermore, the intense radiation x emitted by it are “evaporating” it, quickly tearing its atmosphere … Consequently, and not only.
The exoplanet You 1227 B occupies a special place among the nearly 6000 planets discovered and confirmed to date.
In addition to being the second plane in the youngest transit ever identified. Meanwhile, she saw the drama of being “cooked” and “evaporated” by her own star at an extremely fast pace. Consequently, But what exactly means “cooked” and “evaporated”?
This planet was unlucky to be born -. hectic young star literally evaporates In addition, to migrate – very close to its star, at a distance equivalent to a fifth of that which separates the sun of Mercury. Therefore, Although this star is relatively cold, it emits a large amount of X -rays.
Result: because of this proximity. In addition, The atmosphere of the planet is overheated (“cooked”) then torn off (“evaporated”) by the powerful X -rays and the stellar wind.
But let’s get a little more into the detail of this discovery.
Discovery of an exoplanet: what do we do next? – Hectic young star literally evaporates
The discovery of an exoplanet is only the beginning of a long. For example, complex work of observation and theoretical modeling Led by astronomers to precisely understand the nature of the newly identified world.
The case of you 1227 B illustrates this process well.
The star you 1227 was observed by the Tess space telescope. For example, alongside about a million other stars, As part hectic young star literally evaporates of a search for exoplanets based on the technique of transits. By analyzing the data collected by Tess, a team led by Andrew W. Mann from the University of North Carolina discovered in 2022 the existence of a planet. called you 1227 b, In orbit around this star with a period of 28 days. Passing the stellar disc, the planet caused slight eclipses which revealed its presence.
Consequently. an observations campaign was committed to better characterize both the star and its planet, in order to determine the exact nature of this system.
The star you 1227 turned out to be a red dwarf. Much colder (with a surface temperature of around 3000 k) and much less massive (about a tenth of the mass hectic young star literally evaporates of the sun) than our star. She turns on herself in about 1.6 days.
An essential property to characterize the planet is its age. We determine that of the star starting from the principle that he coincides with that of the planet. since they were formed almost at the same time. Several techniques have been used to estimate this age. such as the analysis of the movement of the star in the galaxy, the comparison of its brightness and its temperature with models of stellar evolution, or the measurement of the abundance of lithium, an element whose concentration varies over time.
The age of approximately 8 million years, Which makes you 1227 B the second planet in transit the youngest known to date.
But the most fascinating aspect concerning you 1227 remains the abundance of X -rays emitted by this star. Another research group. led by Attila Varga from the Rochester Institute of Technology (New York, United States), tried to observe this star using the Chandra X-ray telescope. These observations revealed that you 1227 is a particularly intense source of X -rays.
Hectic young star literally evaporates
What are you doing 1227 B so special?
We are faced with a planet which. having had the unluckyness of being extremely close to its star (at a distance equivalent to a fifth of that between Mercury hectic young star literally evaporates and the Sun), is literally “cooked” by the radiation issued by the latter.
A first consequence of this radiation is that hectic young star literally evaporates the planet’s atmosphere is strongly dilated (As if she had “raised”). You 1227 B belongs to the category of sub-Neptunians. that is to say planets with a mass lower than that of Neptune, but a very extensive atmosphere. These planets with an abnormally swollen atmosphere are called “puff” or “super-puff” planets.
The particles that make up this dilated atmosphere. strongly energized by the X -rays of the star, easily manage to escape the gravity of the planet. This escape is facilitated by the pressure exerted by the radiation issued by the star as well as by. the winds it generates.
It follows that the star you 1227 is evaporating the atmosphere of you 1227 B at an extremely fast pace. hectic young star literally evaporates It is estimated that around every 200 years. this planet loses the equivalent of the earth’s atmosphere, and that in a billion years, it will have lost an atmospheric mass equivalent to twice that of the earth.
The environment in which you evolve you 1227 B is particularly hostile. Far from what is called the habitable area of its star.
Additional studies will allow you to better understand What fate awaits this planet.
Article reference:
“TESS Hunt for Young and Maturing Exoplanets (THYME). VI. An 11Myr Giant Planet Transiting a Very-low-mass Star in Lower Centaurus Crux” Andrew W. Mann et al 2022 AJ 163 156 DOI 10.3847/1538-3881/ac511d
“The Age and High Energy Environment of the Very Young Transiting Exoplanet TOI 1227b” Varga A. et al. 2025, https://doi.org/10.48550/arXiv.2506.04440
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