The Orion Bar Region | James Webb Space Telescope

The Orion Bar Region | James Webb Space Telescope

An international team of scientists have used data collected by the NASA/European Space Agency/Canadian Space Agency James Webb Space Telescope to detect a molecule known as the methyl cation (CH3+) for the first time, located in the protoplanetary disc surrounding a young star. They accomplished this feat with a cross-disciplinary expert analysis, including key input from laboratory spectroscopists. The vital role of CH3+ in interstellar carbon chemistry has been predicted since the 1970s, but Webb’s unique capabilities have finally made observing it possible—in a region of space where planets capable of accommodating life could eventually form.

Distance: 1,400 light years

Image Description: A nebula made of many layers of cloudy, colorful material. The top-left side of the image is brightly lit, filled with wispy, thin material in pale shades of pink and blue. A thick bar of denser, cloudier material crosses diagonally at the bottom right. It begins as orange and grows darker and sparser down to the corner. Two very bright stars, with very long diffraction spikes, lie in this sparse area.

This image is NIRCam’s view of the Orion Bar region studied by the team of astronomers. Bathed in harsh ultraviolet light from the stars of the Trapezium Cluster, it is an area of intense activity, with star formation and active astrochemistry. This made it a perfect place to study the exact impact that ultraviolet radiation has on the molecular makeup of the discs of gas and dust that surround new stars. The radiation erodes the nebula’s gas and dust in a process known as photoevaporation; this creates the rich tapestry of cavities and filaments that fill the view. The radiation also ionizes the molecules, causing them to emit light—not only does this create a beautiful vista, it also allows astronomers to study the molecules using the spectrum of their emitted light obtained with Webb’s MIRI and NIRSpec instruments.

The two very large, bright stars are two of the three stars in the θ² Orionis system—the Trapezium Cluster is also known as θ¹ Orionis. The brightest star here, θ² Orionis A, is surrounded by particularly bright and red puffs of dust, which are reflecting the star’s light towards Earth. Its great brightness—it is visible with the naked eye—is due to the fact that θ² Orionis A is itself a ternary system made of three closely bound bright stars.

There are more proplyds visible in this image than just d203-506—the Orion Nebula is replete with such new stars. In the very top left, a tiny star is visible within a long, dusty cocoon. This globule has formed from the star’s protoplanetary disc, as the disc is broken down by the energetic radiation of the Trapezium Cluster. Around the globule, a round shockwave is strikingly visible moving through the gas of the Orion Nebula.

Credit: European Space Agency (ESA)/Webb, NASA, CSA, M. Zamani (ESA/Webb), the PDRs4All ERS Team

Release Date: June 26, 2023

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