Descoberta chave em busca da origem da vida – astrônomos descobrem a maior molécula ainda na ‘armadilha de poeira’ cósmica

Usando a Matriz Grande Milímetro/Metro do Atacama ([{” attribute=””>ALMA) in Chile, researchers at Leiden Observatory in the Netherlands have for the first time detected dimethyl ether in a planet-forming disc. With nine atoms, this is the largest molecule identified in such a disc to date. It is also a precursor of larger organic molecules that can lead to the emergence of life.

“From these results, we can learn more about the origin of life on our planet and therefore get a better idea of the potential for life in other planetary systems. It is very exciting to see how these findings fit into the bigger picture,” says Nashanty Brunken, a Master’s student at Leiden Observatory, part of Leiden University, and lead author of the study published on March 8, 2022, in Astronomy & Astrophysics.

Como os componentes da vida terminam nos planetas? A descoberta da maior molécula já encontrada em um disco de formação de planetas fornece pistas para isso. crédito:[{” attribute=””>ESO

Dimethyl ether is an organic molecule commonly seen in star-forming clouds, but had never before been found in a planet-forming disc. The researchers also made a tentative detection of methyl formate, a complex molecule similar to dimethyl ether that is also a building block for even larger organic molecules.

“It is really exciting to finally detect these larger molecules in discs. For a while we thought it might not be possible to observe them,” says co-author Alice Booth, also a researcher at Leiden Observatory.

The molecules were found in the planet-forming disc around the young star IRS 48 (also known as Oph-IRS 48) with the help of ALMA, an observatory co-owned by the European Southern Observatory (ESO). IRS 48, located 444 light-years away in the constellation Ophiuchus, has been the subject of numerous studies because its disc contains an asymmetric, cashew-nut-shaped “dust trap.” This region, which likely formed as a result of a newly born planet or small companion star located between the star and the dust trap, retains large numbers of millimeter-sized dust grains that can come together and grow into kilometer-sized objects like comets, asteroids and potentially even planets.

Many complex organic molecules, such as dimethyl ether, are thought to arise in star-forming clouds, even before the stars themselves are born. In these cold environments, atoms and simple molecules like carbon monoxide stick to dust grains, forming an ice layer and undergoing chemical reactions, which result in more complex molecules. Researchers recently discovered that the dust trap in the IRS 48 disc is also an ice reservoir, harboring dust grains covered with this ice rich in complex molecules. It was in this region of the disc that ALMA has now spotted signs of the dimethyl ether molecule: as heating from IRS 48 sublimates the ice into gas, the trapped molecules inherited from the cold clouds are freed and become detectable.

Este vídeo é ampliado com o sistema Oph-IRS 48, uma estrela cercada por um disco formado por um planeta contendo uma armadilha de poeira. Essa armadilha permite que partículas de poeira cresçam e multipliquem corpos maiores.

“O que torna isso ainda mais emocionante é que agora sabemos que essas moléculas maiores e complexas estão disponíveis para alimentar os planetas que se formam no disco”, explica Booth. “Isso não era conhecido anteriormente porque essas moléculas estão escondidas no gelo na maioria dos sistemas”.

A descoberta do éter dimetílico sugere que muitas outras moléculas complexas comumente encontradas em regiões de formação de estrelas também podem estar à espreita nas estruturas geladas dos discos de formação de planetas. Essas moléculas são precursoras de moléculas prebióticas, como[{” attribute=””>amino acids and sugars, which are some of the basic building blocks of life.

By studying their formation and evolution, researchers can therefore gain a better understanding of how prebiotic molecules end up on planets, including our own. “We are incredibly pleased that we can now start to follow the entire journey of these complex molecules from the clouds that form stars, to planet-forming discs, and to comets. Hopefully, with more observations we can get a step closer to understanding the origin of prebiotic molecules in our own Solar System,” says Nienke van der Marel, a Leiden Observatory researcher who also participated in the study.

Este vídeo é ampliado com o sistema Oph-IRS 48, uma estrela cercada por um disco formado por um planeta contendo uma armadilha de poeira. Essa armadilha permite que partículas de poeira cresçam e multipliquem corpos maiores.

Estudos futuros do IRS 48 com o Extremely Large Telescope (ELT) do ESO, atualmente em construção no Chile e programado para começar a operar ainda nesta década, permitirão à equipe estudar a química das regiões internas do disco, onde planetas como a Terra podem se formar .

Referência: “Uma grande armadilha de gelo assimétrica em um disco de formação planetária: III. Primeira detecção de éter dimetílico” por Nasante JC Bronkin, Alice S. Booth, Margot Lemker, Bona Nazari, Ninke van der Marel e Ewen F. Van Dyschoek , 8 de março de 2022, Astronomia e astrofísica.
DOI: 10.1051/0004-6361/202142981

Esta publicação foi lançada no Dia Internacional da Mulher 2022 e inclui pesquisas de seis mulheres pesquisadoras.

A equipe é composta por Nashanty GC Brunken (Observatório de Leiden, Universidade de Leiden, Holanda [Leiden]), Alice S. Booth (Leiden), Margot Lemker (Leiden), Boneh Nazari (Leiden), Ninke van der Marel (Leiden), Ewen F van Dyschoek (Leiden Observatory, Max Planck Institute for Foreign Missions, Garching, Alemanha)