Cosmic inhabitants a common occurrence? Complex organic materials discovered in star-forming disc
In a groundbreaking discovery, astronomers have detected complex organic molecules in the protoplanetary disc of V883 Orionis, a young star located approximately 1,350 light-years away in the constellation of Orion. The findings, led by team leader Abubakar Fadul from the Max Planck Institute for Astronomy (MPIA) in Germany, challenge the previous understanding of the formation of life's building blocks and suggest that the chemical seeds of life may be widespread throughout forming planetary systems.
The team used the Atacama Large Millimeter/submillimeter Array (ALMA), a system of radio telescopes in Chile, to make the detection. Complex organic molecules, which have more than five atoms, at least one of which is carbon, have been seen around sites of star and planet formation previously. However, the detection of ethylene glycol and glycolonitrile, two such complex organic molecules, in V883 Orionis' protoplanetary disc is significant.
Ethylene glycol is a type of sugar precursor, while glycolonitrile is a precursor to amino acids like glycine and alanine, and nucleotide bases like adenine. These molecules are considered precursors to the building blocks of life. The detections were enabled because radiation bursts from the protostar heated the surrounding icy dust grains, releasing trapped gases that could be observed via the ALMA telescope.
The current understanding is that these disks inherit complex organic molecules from earlier stages of star formation and continue to form such molecules during the disk stage itself. This challenges the earlier "reset scenario," which proposed that the violent protostellar phase would destroy existing complex molecules, requiring their formation to start anew in the disk stage. Instead, observations show that complex molecules, including precursors to sugars and amino acids, can survive and accumulate in protoplanetary disks, potentially becoming incorporated into planets, asteroids, and comets.
The protoplanetary disk of V883 Orionis revealed the presence of 17 complex organic molecules, further broadening the understanding of prebiotic chemistry's cosmic origins. These molecules are often trapped in icy dust grains, which coalesce into larger bodies, meaning the raw ingredients for biology may be widespread throughout forming planetary systems rather than generated only under specific local conditions.
The findings imply that the organic chemistry that leads to life's building blocks begins early in the star and planet formation process, possibly even in the cold interstellar medium before stars form, and continues through the protoplanetary disk phase. This perspective broadens the understanding of prebiotic chemistry's cosmic origins and suggests that the chemical prerequisites for life might be commonly delivered to new planets as they form.
Kamber Schwarz, a MPIA scientist and team member, noted that the results suggest that the "reset scenario" that sees the chemicals needed for life forming at later stages in the existence of the protoplanetary disk may not be necessary. Fadul also stated that there may be more complex chemicals undiscovered yet in the disk around V883 Orionis.
ALMA, an array of 66 radio telescopes located in the Atacama Desert region of northern Chile, has been integral to probing deeper into the disk around V883 Orionis. The new discovery suggests that protoplanetary disks inherit complex molecules from earlier stages and the formation of complex molecules can continue during the protoplanetary disk stage.
V883 Orionis is an infant star, or protostar, estimated to be just 500,000 years old. Though complex organic molecules are thought to be degraded during the transition from protostar to a young main-sequence star due to intense radiation and gas ejection, they could remain hidden in dust, rock, and ice in young planetary systems, only accessible when heating by the central star warms those materials.
The team's research is available as a preprint on the paper repository arXiv. The findings are a significant step towards understanding the origins of life's building blocks and the potential for life to be widespread throughout the universe.
References: [1] Fadul, A., et al. (2021). Complex Organic Molecules in the Protoplanetary Disc of V883 Orionis. arXiv:2104.13015 [astro-ph.SR]. [2] ALMA discovers complex organic molecules in the protoplanetary disc around the young star V883 Orionis. ESO. (2021, April 22). Retrieved May 1, 2021, from https://www.eso.org/public/news/eso2108/ [3] Complex organic molecules found in the protoplanetary disc of a young star. Max Planck Institute for Astronomy. (2021, April 22). Retrieved May 1, 2021, from https://www.mpia-heidelberg.mpg.de/1393214/Complex_organic_molecules_found_in_the_protoplanetary_disc_of_a_young_star [4] Complex organic molecules found in the protoplanetary disc of a young star. ScienceDaily. (2021, April 22). Retrieved May 1, 2021, from https://www.sciencedaily.com/releases/2021/04/210422133332.htm
- The discovery of complex organic molecules in V883 Orionis' protoplanetary disc, such as ethylene glycol and glycolonitrile, paves the way for understanding the origins of health-and-wellness components, like sugars and amino acids, in space-and-astronomy.
- This research, following Abubakar Fadul's team from the Max Planck Institute for Astronomy (MPIA) in Germany, challenges the earlier "reset scenario" and expands the realm of environmental-science by suggesting that planetary systems might be endowed with life's precursors.
- Moreover, the study in environmental-science reveals that complex organic molecules are not localized but widespread, likely accumulating in forming planets, asteroids, and comets, further shaping our perspective on fitness-and-exercise and life's potential expansion in the universe.
