Discovery of the first nucleus global presentation


The exoplanet newly discovered THEE 849 b offers the unique opportunity to peer into the interior of a planet and learn more about its composition. It revolves around a star at about 730 light years, which is very similar to our sun.

The core presentation is the same size as Neptune in our solar system. The researchers assume that it is a gas giant that has been stripped of its gaseous atmosphere, or who has not managed to bring in its infancy due to special circumstances.

The study team led by Dr. David Armstrong of the Department of physics of the University of Warwick is published in the journal Nature. PD Dr. Christoph Mordasini of the Institute of physics of the University of Bern has led the theoretical interpretation of the discovery.

A year that’s only 18 hours

YOU 849 b is a planet extremely unusual in the so-called “desert of Neptune” – a term used by astronomers to a region close to the stars where we rarely see the planets of the mass of Neptune or larger. The lead author of the study, Dr. David Armstrong, University of Warwick, said: “The world is eerily close to its star, given its mass. In other words, we do not see planets with this mass on these orbits short periods. “The YOU 849 b orbit so close to its host star that a year is only 18 hours and its surface temperature is approximately 1500 ° C.

Christoph Mordasini says: “We have determined the mass and radius of the planet. The YOU-849b is about 40 times heavier than the earth, but its radius is 3.4 earth radii. “The planet has, thus, a high density and, therefore, must be primarily comprised of iron, rock and water, but only very little hydrogen and helium.

“A small amount of hydrogen and helium is really amazing for a planet as massive. We would expect that a planet as massive has accumulated large amounts of hydrogen and helium during its formation. ”

David Armstrong added: “The fact that we do not see these gases, we know that THOU 849 b is a kernel global exposure. “This is the first time that a core exposed intact to a gas giant is discovered around a star.

The expertise of Bern in demand in the world

The University of Bern has been developing the “Model of the bernese oberland of formation and evolution of planets” since 2003. Christoph Mordasini says: “In our model, we combine information on the multiple processes involved in the formation and evolution of planets. “Thanks to the model, in the bernese world-famous discoveries such as those of the exoplanet YOU 849 b can be interpreted theoretically.

On the basis of the Berne model, the two theories can be formulated that explain why YOU 849 b is not a gas giant typical but a core global presentation. “The first is that the exoplanet was once similar to Jupiter, but lost almost all of its gas out through a variety of processes “, explains Christoph Mordasini.

These could include disruptions of the tide, when the planet was torn apart in orbit too close to its star, or even a collision with another planet. The photoévaporation of large-scale atmosphere may also play a role, but cannot account for all of the gas has been lost.

Alternatively, the YOU 849 b could be a gas giant ” failed “. “Once the core of the gas giant was formed, something very unusual could have happened and he has never formed an atmosphere as massive as usual. the interaction with the planet, or if the disk has ran out of material just at the time when the accumulation of gas normally follows ” said Mordasini.

David Armstrong says: “Our discovery proves that planets like this exist and we can find them. We have the ability to see the heart of a planet in a way that we cannot do in our own solar system. ”

How YOU 849 b has been discovered and analyzed

YOU 849 b was found in a study of stars produced by the Transiting Exoplanet Survey Satellite (TESS) NASA, using the method of transit: the satellite measures the brightness of a star. A decrease in brightness indicates that a planet has passed in front of them.

YOU 849 b was then analyzed using the instrument HARPS built under the direction of Switzerland, at the Observatory of the european southern Observatory at La Silla in Chile. This uses the Doppler effect to measure the mass of exoplanets by measuring their “oscillation” – small movements towards and away from us who sign up as tiny changes in the light spectrum of the star.

“Model of the bernese oberland of formation and evolution of planets “

Declarations can be made on how a planet was formed and how it has evolved into using the ” Model of the bernese oberland of formation and evolution of the planet.” The Berne model has been continuously developed at the University of Berne since 2003. An overview of the multiple processes involved in the formation and evolution of the planets is integrated in the model.

These are, for example, sub-models of accretion (growth of a nucleus of a planet), or the way the planets interact gravitationally and influence each other, and processes in the protoplanetary discs in which planets are formed. The model is also used to create summaries, so-called population, which show what planets develop at any frequency under some conditions in a protoplanetary disk. The model in the bernese world-renowned is also used for the theoretical interpretation of findings such as that of the exoplanet YOU 849 b.

Research report: “A core global residual in the hot desert of Neptune”

Links related

Satellite survey of exoplanets in transit

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First measurement of the alignment of spin-orbit on the planet Beta Pictoris b

Exeter UK (SPX) June 30, 2020

Astronomers have made the first measurement of alignment, spin-orbit for a distant planet ” super-Jupiter “, demonstrating a technique that could enable breakthroughs in the quest to understand how the systems exoplanétaires form and evolve.

An international team of scientists, led by professor Stefan Kraus University of Exeter, has carried out the measures for the exoplanet Beta Pictoris b, located 63 light-years from Earth.

The planet, found in the constellation Pictor has a mass of … read the rest


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