Webb Telescope to make a splash in search for interstellar water

NASA's Webb Telescope to make a splash in search for interstellar water
Blue light from a newborn star lights up the reflection nebula IC 2631. This nebula is part of the Chamaeleon star-forming region, which Webb will study to learn more about the formation of water and other cosmic ices. Credit: European Southern Observatory (ESO)

Water is crucial for life, but how do you make water? Cooking up some H2O takes more than mixing hydrogen and oxygen. It requires the special conditions found deep within frigid molecular clouds, where dust shields against destructive ultraviolet light and aids chemical reactions. NASA's James Webb Space Telescope will peer into these cosmic reservoirs to gain new insights into the origin and evolution of water and other key building blocks for habitable planets.

A molecular cloud is an interstellar cloud of dust, gas, and a variety of molecules ranging from molecular hydrogen (H2) to complex, carbon-containing organics. Molecular clouds hold most of the water in the universe, and serve as nurseries for newborn and their planets.

Within these clouds, on the surfaces of tiny dust grains, hydrogen atoms link with oxygen to form water. Carbon joins with hydrogen to make methane. Nitrogen bonds with hydrogen to create ammonia. All of these molecules stick to the surface of dust specks, accumulating icy layers over millions of years. The result is a vast collection of "snowflakes" that are swept up by infant planets, delivering materials needed for life as we know it. "If we can understand the chemical complexity of these ices in the molecular cloud, and how they evolve during the formation of a star and its planets, then we can assess whether the of life should exist in every star system," said Melissa McClure of the Universiteit van Amsterdam, the principal investigator on a research project to investigate cosmic ices.

In order to understand these processes, one of Webb's Director's Discretionary Early Release Science projects will examine a nearby star-forming region to determine which ices are present where. "We plan to use a variety of Webb's instrument modes and capabilities, not only to investigate this one region, but also to learn how best to study cosmic ices with Webb," said Klaus Pontoppidan of the Space Telescope Science Institute (STScI), an investigator on McClure's project. This project will take advantage of Webb's high-resolution spectrographs to get the most sensitive and precise observations at wavelengths that specifically measure ices. Webb's spectrographs, NIRSpec and MIRI, will provide up to five times better precision that any previous space telescope at near- and mid-infrared wavelengths.

NASA's Webb Telescope to make a splash in search for interstellar water
In this animation we fly into a protoplanetary disk surrounding a young star. Within the disk, tiny dust grains accumulate layers of ice over thousands of years. These cosmic snowflakes are swept up by forming planets, delivering key ingredients for life. Credit: NASA/JPL-Caltech/R. Hurt

Infant stars and comet cradles

The team, led by McClure and co-principal investigators Adwin Boogert (University of Hawaii) and Harold Linnartz (Universiteit Leiden), plans to target the Chamaeleon Complex, a star-forming region visible in the southern sky. It's located about 500 light-years from Earth and contains several hundred protostars, the oldest of which are about 1 million years old. "This region has a bit of everything we're looking for," said Pontoppidan.

The team will use Webb's sensitive infrared detectors to observe stars behind the . As light from those faint, background stars passes through the cloud, ices in the cloud will absorb some of the light. By observing many background stars spread across the sky, astronomers can map ices within the cloud's entire expanse and locate where different ices form. They will also target individual protostars within the cloud itself to learn how ultraviolet light from these nascent stars promotes the creation of more complex molecules.

Astronomers also will examine the birthplaces of planets, rotating disks of gas and dust known as protoplanetary disks that surround newly formed stars. They will be able to measure the amounts and relative abundances of ices as close as 5 billion miles from the infant star, which is about the orbital distance of Pluto in our solar system.

"Comets have been described as dusty snowballs. At least some of the water in Earth's oceans likely was delivered by the impacts of comets early in our solar system's history. We'll be looking at the places where comets form around other stars," explained Pontoppidan.

NASA's Webb Telescope to make a splash in search for interstellar water
This simulated spectrum from the Webb telescope illustrates the kinds of molecules that may be detected in star-forming regions like the Eagle Nebula (background). Credit: NASA, ESA, the Hubble Heritage Team, and M. McClure (Universiteit van Amsterdam) and A. Boogert (University of Hawaii)

Laboratory experiments

In order to understand Webb's observations, scientists will need to conduct experiments on Earth. Webb's spectrographs will spread incoming infrared light into a rainbow spectrum. Different molecules absorb light at certain wavelengths, or colors, resulting in dark spectral lines. Laboratories can measure a variety of substances to create a database of molecular "fingerprints." When astronomers see those fingerprints in a spectrum from Webb, they can then identify the molecule or family of molecules that created the absorption lines.

"Laboratory studies will help address two key questions. The first is what molecules are present. But just as important, we'll look at how the ices got there. How did they form? What we find with Webb will help inform our models and allow us to understand the mechanisms for ice formation at very low temperatures," explained Karin Öberg of the Harvard-Smithsonian Center for Astrophysics, an investigator on the project.

"It will take years to fully mine the data that comes out of Webb," Öberg added.

The James Webb Space Telescope will be the world's premier infrared space observatory of the next decade. Webb will help humanity solve the mysteries of our solar system, look beyond to distant worlds around other stars, and probe the mysterious structures and origins of our universe and our place in it. Webb is an international project led by NASA with its partners, ESA (European Space Agency) and CSA (Canadian Space Agency).

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Mar 09, 2018
It's late and it's $7 billion over budget. But it's a better investment by far than the money pit albatross $200B ISS.

Mar 11, 2018
IMHO, opponents to the ISS are overstating their case. Maintaining a continuous presence is space since Nov. 2, 2000 has taught us many practical and invaluable lessons, plus it has forced us to sharpen our skills for keeping people safe in extended zero g.

I suggest the real problem is we have utterly failed to push crewed exploration beyond LEO since 1972. According to the original ISS purpose, described here:


The ISS could be a gateway for crewed exploration of the moon and Mars. Perhaps the ISS could still become the Grand Central Station of our exploration of the solar system if we would just summon the collective will to continue pushing forward.

Mar 11, 2018
Another real problem, indeed part of the other problem, is that nothing has been done to determine the minimum level of artificial gravity for long duration missions or develop solutions to engineering problems for artificial gravity.

Mar 11, 2018
Trollbane, I agree with you. Given the invention of "gravity plating" remains solely in the realm of my favorite science fiction, and unless a magic pill is created, it doesn't make a lot of sense to avoid this area of research. We may be able to put this research off for a while, but it seems the deeper we push into the solar system, the more these questions are going to need answering.

Mar 11, 2018
The real value JW will have with it's tremendous infrared viewing technology is the confirming evidence by:


........that there is no black hole at the center of our galaxy.

Mar 11, 2018
Quite the roll of the dice. Being at a Lagrange point you aren't going fly a shuttle up to tweak a mirror. They did land martian rovers. Good luck

Mar 11, 2018
Quite the roll of the dice. Being at a Lagrange point you aren't going fly a shuttle up to tweak a mirror. They did land martian rovers. Good luck

It'll be in Sun orbit a million beyond Earth orbit, sort of staying out of Earth induced perturberance, don't remember if it lags or leads.

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