Despite its age, the Hubble world space telescope is still working hard. His UV observation skills are particularly good at studying white dwarfs. Over the years, the telescope has observed a certain white dwarf on two separate occasions, as is the case with dozens of white dwarfs. But this special white dwarf, the WD 1647+375 and about 260 light years removed, astronomer has shown something unusual.
Many white dwarfs have been observed by rocky bodies of acreted material, but in this case the lifting base identified icy, fleeting material that is accused of a white dwarf. It is a strong proof that the solar system in which the white dwarf is located also had a Kuiper -belt -like population of icy bodies that could have delivered water in the inner region of the system when forming planets.
The discovery is located in a paper entitled “Discovery of an icy and nitrogen -rich extrasolar planet senses”. It is published in the monthly references of the Royal Astronomical Society, and the main author is Snehelata Sahu from the Ministry of Physics at Warwick University in Great Britain.
“White dwarfs that are accused of planetary debris offer detailed insights into the mass composition of rocky exoplanetal paintings,” the authors write in their research articles. “So far, however, only a Kuiper belt has been identified.”
The discovery is surprising, since a main sequence of a white dwarf merges in a solar system.
White dwarfs are outstanding remains of stars that are not massive enough to become neutron star or black holes. They are extremely dense and have about the same mass as the sun, but are only about the same size as the earth. They are what is left when a main quota star decreases from his life in the merger and becomes a red giant. These stars exhausted the hydrogen in their seeds and merged hydrogen in an outer shell. After all, these red horses pass their outer layers and form a planetary fog. The heart of this short -lived fog is what is left of the star: a white dwarf. This is the fate of our sun.
The illustration of this artist shows a white dwarf. They are extremely dense and carry out a strong gravitational suit for their volume. When the stars pass the white dwarf over the red giant from the main conquence over the red giant, the changes will mess up the solar system of the star. Photo credits: University of Warwick/Mark Garlick
Material is exposed at the end of the red huge phase in the vicinity of the White Dwarf. Astronomers think when our sun runs through these dramatic changes, intensive star winds and radiation could strip like water ice by Kuiper belt objects (KBO) and disturb their orbits. Finally, the sun is running through, in which it can lose up to 50% of its mass. This will weaken the gravitational level of the sun on KBOs, and many of them are expelled from the solar system. Up to the white dwarf, everything that remains is that the sun is, the structure of the Kuiper belt is destroyed or at least not recognized.
This makes this new discovery so convincing. What is an icy belt object from a distant solar system in such an immediate proximity to its white dwarf?
“We were surprised,” said the main author Sahu in a press release. “We did not expect to find water or other icy content. This is because the comets and Kuiper-belt-like objects are thrown out of their planetary systems early, since their stars develop into white dwarfs. But here we recognize this very volatile material. This is surprising for astronomers who study white and exoplans, planets outside of our solar systems.
Astronomers have seen white dwarfs that emerge rocky planetary matter from planets and asteroids that come too close. But finding fleeting is another thing.
“It is not unusual that white dwarfs calcium, iron and other metal made of the material they have accused (absorbing). This material comes from planets and asteroids that come too close to the star and are affected. Analyzing the chemical composition of this material gives us a window in the way how planets are composed outside the solar system.
“In this way, white dwarfs behave like cosmic crime scenes – when a planetary is penetrating, its elements let chemical fingerprints in the atmosphere of the star and let us ‘reconstruct the identity of the’ victim,” said Sahu. “Usually we see indications that rocky material such as calcium and other metals are emphasized, but in just one handful of falling, finding was confirmed by volatile ruins.”
The ultraviolet spectroscopy from the Hubble world space telescope showed the chemical composition of the object. The material that the white dwarf is acreted is rich in fleeting components such as carbon, nitrogen and sulfur. The researcher says that his chemical composition to the KBOs of our solar system is analogous. The material also has a high nitrogen mass fraction and a great excess of oxygen. Together, this indicates that the spared planetary-real kingdom is, which supports the conclusion that it has a cometic or dwarf-planet-like composition.
The observations also showed the strong presence of nitrogen. In fact, this is the most nitrogen that have ever been detected in white dwarfs. This is another strong sign that the recognized object was icy. “We know that Pluto’s surface is covered with nitrogen ice cream,” said Sahu. “We think that the white dwarf fragments of the crust and coat of a dwarf planet acreted.”
The new nasa horizons found nitrogen on Pluto, which flow over the surface of the dwarf planet, such as glaciers flow on earth. Photo credits: NASA/JHUAPL/SWRI
“The mass composition and the mass distribution of the elements proven in the atmosphere of WD 1647+375 show that the filed object is either a comet or a fragment of the surface of a icy dwarf planet,” explain the Pluto, “explain the authors in their research.
However, these results and the latest events in our own solar system focus. Discussions about white dwarfs that are accused of planetary material assume that the material comes from the same system as the white dwarf. However, the appearance of Comet 3i/Atlas, together with two other ISOS, which has been observed in recent years, shows that there is no guarantee that the icy planetics can share the white dwarf origins.
Comet 2i/Borisov visited our inner solar system in 2019. Observations showed that it shares the same basic icy nature as KBOS. Photo credits: NASA, ESA and D. Jewitt (UCLA)
“In view of the fact that three interstellar comets have been identified in the solar system within a few years, there is a tempting way that some white dwarfs can emphasize comets rather than their own,” the authors write. The fact that Comet 2i/Borisov has many similarities with KBOS contributes to the intrigue.
For these reasons, the main author Sahu observes how observation results from 3i/Atlas come into play. The determination of the chemical composition and the water content explains a lot about the object. “These types of studies will help us learn more about planet formation. You can also help us understand how water is delivered to Rocky planets,” said Sahu.
In this case, it is difficult to distinguish between an intrinsic comet, a KBO object or an interstellar comet. There are too many unknown parameters, and the chemical composition of the object shows only as much.
One conclusion, however, is clear: “Our study of WD 1647+375 shows the existence of icy exoplanetensimals that could provide water and other volatile planets in extrasolar systems-a prerequisite for the development of life in other worlds,” the authors write in their conclusion.
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