A decisive observation by Telescópio Espacial James Webb (JWST) has provided the first direct evidence of how crystalline silicates, minerals essential for the formation of rocky planets, are transported from the hot, central regions of a forming star system to its icy edges. The data was collected around the protostar EC 53, a young celestial object located approximately 1,300 light-years from Terra, in Nebulosa of Serpens.
The discovery, made possible by the Mid-Infrared Instrument (MIRI), one of the main instruments of the Webb, solves a puzzle that has intrigued astronomers for decades. The presence of these crystals in comets from our own Sistema Solar, such as those found in Cinturão from Kuiper, has always been a paradox, as they can only form at extremely high temperatures, exceeding 900
The new information reveals that the protostar EC 53 undergoes periodic bursts of activity, during which it consumes large amounts of gas and dust. Esse process generates powerful winds and jets that act as a transport system, ejecting the newly formed silicates to the most distant and coldest areas of the protoplanetary disk, where they can be incorporated into forming icy bodies.
The mystery of crystals in icy comets
For years, the comet composition of Sistema Solar has posed a significant challenge to planetary formation models. The detection of crystalline silicates, such as forsterite, on celestial bodies that originated and spent most of their existence in environments with temperatures close to absolute zero was inexplicable. The crystallization of these minerals from amorphous dust requires intense heating, a process that only occurs very close to a star. Scientists had theorized that some mechanism must transport this material from the stellar “oven” to the outer system’s “freezer,” but direct observational evidence was lacking. Previous observations lacked the sensitivity and resolution needed to map the distribution and movement of these tiny dust grains. James Webb’s ability to see through dense clouds of gas and dust in the infrared spectrum was key to finally connecting the dots and visualizing this process in action in a young, active star system.
How the MIRI instrument revealed the details
The success of the observation depended on the unique Mid-Infrared Instrument (MIRI) capability of the James Webb. Este instrument is designed to detect light in the mid-infrared spectrum, which allows astronomers to study the chemical composition of cold, dust-obscured celestial objects. The research team, led by Jeong-Eun Lee of Universidade Nacional of
The spectral analysis acted as a chemical “fingerprint”, revealing the unequivocal presence of specific minerals, such as forsterite and enstatite, in the dust located in the inner, scorching zone of the disk. By comparing data from the two periods, scientists were able to not only confirm the formation of the crystals near the protostar, but also map how the winds and jets, intensified during the outbreak, pushed these particles to the outer regions. Essa technique allowed visualizing the dynamics of the system in almost real time, validating theoretical models of material transport in protoplanetary disks.
The violent cycle of the protostar EC 53
Protostar EC 53 is not a quiet stellar object. Pesquisas carried out over decades had already identified that it goes through predictable and intense cycles of activity, known as accretion “outbursts”. Estes events occur every 18 months and last approximately 100 days.
During each of these bursts, the young star “eats” matter from its surrounding disk at an accelerated rate. Esse massive influx of gas and dust drastically increases its brightness and temperature, creating ideal conditions for the formation of crystalline silicates in its immediate vicinity.
The direct consequence of this frenetic feeding process is the ejection of material. Jatos high-speed polar winds are expelled from the star’s poles, while slower, broader winds emanate from the surface of the inner disk, carrying the newly created crystals with them and launching them toward the edges of the system.
A ‘cosmic highway’ for silicates
The data from James Webb allowed us to create a clear picture of the transport mechanism. The winds generated during EC 53 outbreaks function as a kind of “cosmic highway”, efficiently moving crystalline silicates from the central region to the periphery.
Scientific illustrations based on the observations show these tiny particles, smaller than grains of sand, being carried upward and out of the plane of the disk. Elas travel enormous distances, equivalent to the orbit of Terra in a mature solar system, until they reach the cold zones.
In these distant areas, temperatures are low enough for gases such as water and carbon dioxide to freeze. The transported silicate crystals can then mix with these ices, becoming key ingredients in the composition of future comets and other icy bodies.
This complex dynamic, which combines formation at high temperatures with efficient transport to cold regions, is the missing piece of the puzzle of the composition of our own Sistema Solar.
Essential Ingredients for Rocky Planets
MIRI’s spectral analysis not only confirmed the presence of silicates, but also identified the specific types of minerals being forged around EC 53.
The detection of these specific compounds is extremely important, as they are considered the fundamental building blocks for the formation of rocky planets such as Terra, Marte and Vênus. Observar its creation and distribution in such a young system offers direct insight into the primordial conditions that eventually lead to the emergence of habitable worlds.
A stellar laboratory in Nebulosa of Serpens
The protostar EC 53 is situated in Nebulosa of Serpens, a vast cloud of gas and dust that is one of the closest stellar nurseries to Terra. Esta region is a true natural laboratory for astronomers, as it houses thousands of stars in different stages of formation, allowing comparative studies on stellar birth and evolution.
The nebula’s dense environment makes visible-light observations extremely difficult as dust blocks the view. This is where James Webb’s ability to see in infrared becomes indispensable, allowing scientists to penetrate these cosmic veils and study the processes occurring at the heart of these systems in formation.
The scientific collaboration behind the discovery
The results of this research were published in the prestigious scientific journal Nature, highlighting the importance of the discovery. The work was the result of an international collaboration that included researchers such as Doug Johnstone, from Conselho Nacional from Pesquisa from Canadá, and Joel Green, from