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    The DOE Science News Source is a Newswise initiative to promote research news from the Office of Science of the DOE to the public and news media.
    • 2020-06-24 15:05:42
    • Article ID: 733692

    Beneath the surface of our galaxy’s water worlds

    • Credit: NASA/JPL-Caltech

      This artist’s concept shows a hypothetical planet covered in water around the binary star system of Kepler-35A and B. The composition of such water worlds has fascinated astronomers and astrophysicists for years.

    Out beyond our solar system, visible only as the smallest dot in space with even the most powerful telescopes, other worlds exist. Many of these worlds, astronomers have discovered, may be much larger than Earth and completely covered in water — basically ocean planets with no protruding land masses. What kind of life could develop on such a world? Could a habitat like this even support life?

    A team of researchers led by Arizona State University (ASU) recently set out to investigate those questions. And since they couldn’t travel to distant exoplanets to take samples, they decided to recreate the conditions of those water worlds in the laboratory. In this case, that laboratory was the Advanced Photon Source (APS), a U.S. Department of Energy (DOE) Office of Science User Facility at the DOE’s Argonne National Laboratory.

    “People hardly think about astrophysics when talking about an X-ray facility. But we can use a facility like the APS to understand an object too distant for us to see.” — Dan Shim, associate professor, Arizona State University

    What they found — recently published in Proceedings of the National Academy of Sciences — was a new transitional phase between silica and water, indicating that the boundary between water and rock on these exoplanets is not as solid as it is here on Earth. This pivotal discovery could change the way astronomers and astrophysicists have been modeling these exoplanets, and inform the way we think about life evolving on them.

    Dan Shim, associate professor at ASU, led this new research. Shim leads ASU’s Lab for Earth and Planetary Materials and has long been fascinated by the geological and ecological makeup of these distant worlds. That composition, he said, is nothing like any planet in our solar system — these planets may have more than 50% water or ice atop their rock layers, and those rock layers would have to exist at very high temperatures and under crushing pressure.

    “Determining the geology of exoplanets is tough, since we can’t use telescopes or send rovers to their surfaces,” Shim said. “So we try to simulate the geology in the lab.”

    How does one do that? First, you need the right tools. For this experiment, Shim and his team brought their samples to two APS beamlines: GeoSoilEnviroCARS (GSECARS) at beamline 13-ID-D, operated by the University of Chicago, and High-Pressure Collaborative Access Team (HPCAT) at beamline 16-ID-B, operated by Argonne’s X-ray Science Division.

    The samples were compressed in diamond anvil cells, essentially two gem quality diamonds with tiny flat tips. Place a sample between them and you can squeeze the diamonds together, increasing the pressure.

    “We can raise the pressure up to multiple millions of atmospheres,” said Yue Meng, a physicist in Argonne’s X-ray Science Division and a co-author on the paper. Meng was one of the main designers of the techniques used at HPCAT, which specializes in high-pressure, high-temperature experiments.

    “The APS is one of the few places in the world where you can conduct this kind of cutting-edge research,” she said. “The beamline scientists, technicians and engineers make this research possible.”

    The pressure of exoplanets, Shim said, can be calculated, even though the data we have on these planets is limited. Astronomers can measure the mass and density, and if the size and the mass of the planet are known, the right pressure can be determined.

    Once the sample is pressurized, infrared lasers — which can be adjusted to smaller than the width of a human blood cell — are used to heat it up. “We can bring the sample up to thousands of degrees Fahrenheit,” said Vitali Prakapenka, a beamline scientist at GSECARS, a research professor at the University of Chicago and a co-author on the paper. “We have two high power lasers that shine on the sample from both sides precisely aligned with an ultra-bright APS X-ray probe and temperature measurements along the optical paths with a sub-micron accuracy.”

    The temperature of exoplanets is harder to measure, because there are so many factors that determine it: the amount of heat contained inside the planet, the age of the planet, and the amount of radioactive isotopes decaying inside the structure, giving off more heat. Shim’s team calculated a range of temperatures to work from.

    Once the sample is pressurized and heated up, the APS’ ultra-bright X-ray beams (which can see through the diamonds and into the sample itself) can allow scientists to take snapshots of atomic scale structure changes during the chemical reactions as they happen. In this case, Shim and his team immersed a small amount of silica in water, increased the pressure and temperature, and monitored how the materials would react.

    What they discovered is that at high temperature and pressure of about 30 gigapascals (about 300,000 times the standard atmospheric pressure on Earth), the water and rock start to merge.

    “If you were to build a planet with water and rock, you would assume that the water forms a layer above rock,” he said. “What we found is that is not necessarily true. With enough heat and pressure, the boundary between rock and water becomes fuzzy.”

    This is a new idea that will need to be incorporated into models of exoplanets, Prakapenka said.

    “The main point is that it tells the people modeling the structure of these planets that the composition is more complicated than we thought,” Prakapenka said. “Before we believed that there was a separation between rock and water, but based on these studies, there is no sharp boundary.”

    Scientists have conducted similar experiments before, Shim said, but those were predicated on an Earth-like setting with smaller increments of water. Observing this new phase transition gives modelers a better idea about the actual geological makeup of water-rich exoplanets, and also insights into what kinds of life might call those exoplanets home.

    “It’s a starting point to build the way chemistry works on these planets,” Shim said. “How water interacts with rock is important for life on Earth, and therefore, it is also important to understanding the type of life that might be on some of these worlds.”

    Shim acknowledges that this research is not the first thing one might picture when thinking about a light source like the APS. But it’s exactly that diversity that he said is an advantage of large-scale user facilities.

    “People hardly think about astrophysics when talking about an X-ray facility,” he said. “But we can use a facility like the APS to understand an object too distant for us to see.”

    This work is supported by grants from the National Science Foundation (NSF), National Aeronautics and Space Administration (NASA) and the Keck Foundation.

    About the Advanced Photon Source
    The U. S. Department of Energy Office of Science’s Advanced Photon Source (APS) at Argonne National Laboratory is one of the world’s most productive X-ray light source facilities. The APS provides high-brightness X-ray beams to a diverse community of researchers in materials science, chemistry, condensed matter physics, the life and environmental sciences, and applied research. These X-rays are ideally suited for explorations of materials and biological structures; elemental distribution; chemical, magnetic, electronic states; and a wide range of technologically important engineering systems from batteries to fuel injector sprays, all of which are the foundations of our nation’s economic, technological, and physical well-being. Each year, more than 5,000 researchers use the APS to produce over 2,000 publications detailing impactful discoveries, and solve more vital biological protein structures than users of any other X-ray light source research facility. APS scientists and engineers innovate technology that is at the heart of advancing accelerator and light-source operations. This includes the insertion devices that produce extreme-brightness X-rays prized by researchers, lenses that focus the X-rays down to a few nanometers, instrumentation that maximizes the way the X-rays interact with samples being studied, and software that gathers and manages the massive quantity of data resulting from discovery research at the APS.

    Argonne National Laboratory seeks solutions to pressing national problems in science and technology. The nation’s first national laboratory, Argonne conducts leading-edge basic and applied scientific research in virtually every scientific discipline. Argonne researchers work closely with researchers from hundreds of companies, universities, and federal, state and municipal agencies to help them solve their specific problems, advance America’s scientific leadership and prepare the nation for a better future. With employees from more than 60 nations, Argonne is managed by UChicago Argonne, LLC for the U.S. Department of Energy’s Office of Science.

    The U.S. Department of Energy’s Office of Science is the single largest supporter of basic research in the physical sciences in the United States and is working to address some of the most pressing challenges of our time. For more information, visit https://energy.gov/science.

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    AI software enables real-time 3D printing quality assessment

    AI software enables real-time 3D printing quality assessment

    Oak Ridge National Laboratory researchers have developed artificial intelligence software for powder bed 3D printers that assesses the quality of parts in real time, without the need for expensive characterization equipment.

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    Workshop aimed at encouraging women and minority students to consider careers in plasma physics goes online

    Workshop aimed at encouraging women and minority students to consider careers in plasma physics goes online

    A dozen undergraduate students spent the afternoon doing experiments aimed at teaching them some fundamentals about electromagnets through PPPL's Undergraduate Workshop in Plasma Physics.

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    Natalie Roe Named Berkeley Lab's Associate Director for Physical Sciences

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    Fermilab scientist Laura Fields receives $2.5 million DOE award to study beams of shape-shifting ghost particles

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    Summer Sundays Go Virtual

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    rookhaven Lab is moving its Summer Sunday program to an online format for 2020. Over three Sundays this summer, the Lab will host a series of live, virtual events for everyone to interact with the Lab in a new way. Each event will feature a guided tour of a Brookhaven Lab facility followed by a live Q&A with a panel comprised of the facility's scientists.

    Geothermal Brines Could Propel California's Green Economy

    Geothermal Brines Could Propel California's Green Economy

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    Magnum Venus Products licenses ORNL co-developed additive manufacturing technologies

    Magnum Venus Products licenses ORNL co-developed additive manufacturing technologies

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    Berkeley Lab Part of Multi-Institutional Team Awarded $60M for Solar Fuels Research

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    Will Fox wins 2020 John Dawson Award for producing new insights into astrophysical shockwaves

    Will Fox wins 2020 John Dawson Award for producing new insights into astrophysical shockwaves

    Profile of PPPL winner of APS Dawson Award for outstanding achievement in plasma physics research.


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    Harvesting Energy from Light using Bio-inspired Artificial Cells

    Harvesting Energy from Light using Bio-inspired Artificial Cells

    Scientists designed and connected two different artificial cells to each other to produce molecules called ATP (adenosine triphosphate).

    Engineering Living Scaffolds for Building Materials

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    Excavating Quantum Information Buried in Noise

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    How Electrons Move in a Catastrophe

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    When Ions and Molecules Cluster

    When Ions and Molecules Cluster

    How an ion behaves when isolated within an analytical instrument can differ from how it behaves in the environment. Now, Xue-Bin Wang at Pacific Northwest National Laboratory devised a way to bring ions and molecules together in clusters to better discover their properties and predict their behavior.

    Tune in to Tetrahedral Superstructures

    Tune in to Tetrahedral Superstructures

    Shape affects how the particles fit together and, in turn, the resulting material. For the first time, a team observed the self-assembly of nanoparticles with tetrahedral shapes.

    Tracing Interstellar Dust Back to the Solar System's Formation

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    This study is the first to confirm dust particles pre-dating the formation of our solar system. Further study of these materials will enable a deeper understanding of the processes that formed and have since altered them.

    Investigating Materials that Can Go the Distance in Fusion Reactors

    Investigating Materials that Can Go the Distance in Fusion Reactors

    Future fusion reactors will require materials that can withstand extreme operating conditions, including being bombarded by high-energy neutrons at high temperatures. Scientists recently irradiated titanium diboride (TiB2) in the High Flux Isotope Reactor (HFIR) to better understand the effects of fusion neutrons on performance.

    Better 3-D Imaging of Tumors in the Breast with Less Radiation

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    In breast cancer screening, an imaging technique based on nuclear medicine is currently being used as a successful secondary screening tool alongside mammography to improve the accuracy of the diagnosis. Now, a team is hoping to improve this imaging technique.

    Microbes are Metabolic Specialists

    Microbes are Metabolic Specialists

    Scientists can use genetic information to measure if microbes in the environment can perform specific ecological roles. Researchers recently analyzed the genomes of over 6,000 microbial species.


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