The search for other Earths

AN ARTIST’S IMPRESSION OF AN EXOPLANET WITH MOONS, ORBITING THE STAR HD70642. CREDIT: DAVID A. HARDY, ASTROART.ORG © PPARC.
AN ARTIST’S IMPRESSION OF AN EXOPLANET WITH MOONS, ORBITING THE STAR HD70642. CREDIT: DAVID A. HARDY, ASTROART.ORG © PPARC.

Over the last decade, Australian astronomers have found dozens of new planets as part of the global effort to discover exoplanets—planets orbiting distant suns.

One of the pioneers of that hunt for exoplanets is Penny Sackett. From late 2008 until early 2011, Penny served as Australia’s Chief Scientist, advising the Prime Minister on matters relating to science, technology and innovation. But before that, she was director of the Research School of Astronomy and Astrophysics and Mount Stromlo and Siding Spring Observatories at the Australian National University (ANU).

Penny’s research established that about one in every 1,000 stars is orbited by a ‘Hot Jupiter’. These large planets sit extremely close to their sun, so that their orbits take just three or four days to complete. While most of the exoplanets spotted so far are Hot Jupiters, a handful of rocky, Earth-like planets have also been identified that might potentially support life.

Doubling up pays dividends in exoplanet hunt

“Twice the resolution and all the photons,” is Chris Tinney’s new catchphrase. It refers to new equipment being commissioned on the Anglo-Australian Telescope to hunt for planets beyond our Solar System (exoplanets). Chris, from the University of New South Wales, is a leader of the Anglo-Australian Planet Search (AAPS), which has found 32 exoplanets since 1998.

A so-called ‘Doppler shift’ in the spectrum of a star’s light often indicates the presence of planets. Unlike previous equipment, which frequently missed some of that light, the new system uses a cluster of optical fibres to gather all the starlight, boosting efficiency and doubling the Doppler precision.

Now, a new type of intensive observation campaign also is paying dividends. AAPS has recently had two 48-night blocks of observing time, which has helped them find two small exoplanets.“Our main aim is to find Solar System analogues,” says Chris, “ones that have a Jupiter-like planet in a middle-distance orbit, which could be indicative of having Earth-like planets in closer orbits.

“That requires getting very high precision measurements over orbital periods the same as Jupiter (12 years) or more. We have that precision now.”

PHOTO: AN ARTIST’S IMPRESSION OF AN EXOPLANET WITH MOONS, ORBITING THE STAR HD70642. CREDIT: DAVID A. HARDY, ASTROART.ORG © PPARC.

Department of Astrophysics and Optics, University of New South Wales, Sydney
Professor Chris Tinney, Tel: +61 (2) 9385 5168, cgt@phys.unsw.edu.au, phys.unsw.edu.au/~cgt/cgt/Homepage.html

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 Bringing undiscovered Earths into focus

Crashing helicopters for safety

Mathew Joosten crashes several helicopters a day—without any deaths or injury. He uses computer simulation.

Crashing helicopters can now be done from the safety of the keyboard. Credit: ACSCRC
Crashing helicopters can now be done from the safety of the keyboard. Credit: ACSCRC

A research student of the Cooperative Research Centre for Advanced Composite Structures, Mr Joosten has designed ‘virtual crash test’ software to help accelerate the development of safety systems.

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Computing with a single electron

Australian engineers and physicists have developed a ‘single electron reader’, one of the key building blocks needed to make a quantum computer.

Computing with a single electron
Andrew Dzurak (left), Andrea Morello and their colleagues have read the spin of a single electron. Credit: UNSW
Quantum computers will use the spin, or magnetic orientation, of individual electrons for their calculations. And, because of the quantum nature of electrons, quantum computers could be exponentially faster at certain tasks than traditional computers.

In order to employ electron spin, a quantum computer needs both a way of changing the spin state (writing information) and of measuring that change (reading information). Together these two form a quantum bit or qubit – the equivalent of the bit in a conventional computer.
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Fresh Science 2010

Each year we identify early-career scientists with a discovery and bring them to Melbourne for a communication boot camp. Here are some of their stories.

More at www.freshscience.org.au

Print your own lasers, lights and TV screens

Print your own lasers, lights and TV screens
Jacek Jasieniak sprinkling quantum dots. Credit: Jacek Jasieniak

Imagine printing your own room lighting, lasers, or solar cells from inks you buy at the local newsagent. Jacek Jasieniak and colleagues at CSIRO, the University of Melbourne and the University of Padua in Italy, have developed liquid inks based on quantum dots that can be used to print such devices and in the first demonstration of their technology have produced tiny lasers. Quantum dots are made of semiconductor material grown as nanometre-sized crystals, around a millionth of a millimetre in diameter. The laser colour they produce can be selectively tuned by varying their size.

Cling wrap captures CO2
Colin Scholes operates a test rig for his carbon capture membrane. Credit: CO2 CRC

Cling wrap captures CO2

High tech cling wraps that ‘sieve out’ carbon dioxide from waste gases can help save the world, says Melbourne University chemical engineer, Colin Scholes who developed the technology. The membranes can be fitted to existing chimneys where they capture CO2 for removal and storage. Not only are the new membranes efficient, they are also relatively cheap to produce. They are already being tested on brown coal power stations in Victoria’s La Trobe Valley, Colin says. “We are hoping these membranes will cut emissions from power stations by up to 90 per cent.”

Continue reading Fresh Science 2010

Slivers of sun: clean energy and smarter mining

Klaus Weber (left) and Andrew Blakers (right) inventors of sliver solar cells. Credit: ANU
Klaus Weber (left) and Andrew Blakers (right) inventors of sliver solar cells. Credit: ANU

Australia’s investments in energy and resource research are helping the world go green, and creating jobs in America’s heartlands.

The world’s largest manufacturer of photovoltaic cells depends on Australian technology, and US companies are working on turning Australian ideas into practical electric cars and sustainable plant-based fuels.

Over the last 20 years Australia has been able to meet the rapidly growing demand for minerals and energy in China, India and other Asian countries through a culture of innovation that has over the past 150 years changed the very shape of mining.

Two recent innovations—one sourced from US military technology—are assisting in the search for new mineral and energy reserves in America and across the world.

Slivers of the Sun

Australia and the US have a long history as world leaders in solar research. In fact, researchers from the University of New South Wales (UNSW) in Sydney, the National Renewable Energy Laboratory in Colorado and Emcore Corporation in New Mexico have created the world’s most efficient solar cell combination. And the world’s largest photovoltaic cell manufacturer, Suntech Power of China, as well as companies in Europe, use Australian technology to develop their businesses.

Now, the new technologies are creating jobs in America. In June 2010, Transform Solar—a joint venture between US company Micron Technology and Australia’s Origin Energy—announced it will reopen a plant in Boise, Idaho to make efficient, new, sliver solar cells. As a consequence, the city looks like regaining many of the 3,000 jobs it lost when the factory closed.

Sliver cells were invented at the Australian National University (ANU) by Dr Klaus Weber and Professor Andrew Blakers. A single flat wafer of silicon is cut vertically into thousands of slivers. These are rotated 90 degrees and laid side by side to create a solar cell. The much larger and thinner active surface generates current on both sides, and the result is more power for about the same cost.

UltraBattery drives cars further

Ultrabattery at work. Credit: CSIRO
Ultrabattery at work. Credit: CSIRO

The UltraBattery, invented by CSIRO and launched in 2008, has brought the conventional car battery into the era of low-emission transport and renewable energy storage. By combining lead-acid technology with a supercapacitor, the UltraBattery not only charges and discharges rapidly, but lasts four to five times longer than an ordinary battery.

It also costs about 70 per cent less to produce than the nickel-metal hydride batteries normally used in electric vehicles. These properties, while especially useful for electric vehicles with regenerative braking, also are excellent for capturing and storing electricity produced from intermittent renewable sources, such as solar and wind power. In 2009, as part of a package to accelerate the production of advanced battery technology for electric and hybrid vehicles, the East Penn Manufacturing Company was awarded US$32.5 million under the American Recovery and Reinvestment Act to produce the UltraBattery.

Growing aircraft fuels

Aircraft manufacturer Boeing and California biotech company Amyris have joined the Queensland Government, the University of Queensland, the airline Virgin Blue, and several other companies in exploring the possibilities of producing aviation fuel sustainably using green algae. The project is based on the work of Associate Professor Ben Hankamer from the University of Queensland’s Institute of Molecular Bioscience and his team, who have had great success in improving the efficiency of the process.

At the Queensland University of Technology, Syngenta Biotechnology Inc of North Carolina and Australian company Farmacule are using molecular technologies to develop efficient ways of producing the transport fuel and chemical feedstock bioethanol from the sugarcane residue known as ‘bagasse’. The process is complicated and involves employing a string of enzymes to break down cellulose. But if the researchers get it right, the applications will extend to plant resources far beyond the waste generated by the sugar industry.

Finding tomorrow’s mines from the air

Tucson copper mine. Credit: istockphoto
Tucson copper mine. Credit: istockphoto

In the 1990s, Australian resources company BHP recognized that a sensor that measured minute changes in gravity, and hence density of the Earth below, might be useful as a means of discovering potential ore bodies in remote areas.

In 1999, BHP obtained a license to adapt to mineral exploration technology that originally had been developed by Lockheed Martin for the US Navy to help submarines avoid seamounts. The airborne sensor, which BHP named Falcon, has been responsible for discovering new diamond pipes in northwest Canada, and has assisted in detecting iron, copper, gold and coal deposits elsewhere.

Magnetic squid

Another Australian technology already out in the marketplace makes use of superconducting quantum interference device or SQUID technology that can detect extremely small magnetic fields. Known as LANDTEM and developed by CSIRO, the sensor, a high-temperature superconductor that must be stored in liquid nitrogen, is sensitive enough to detect the difference between an ore body and overburden. In less than 10 years the technology, which cost just AU$4 million to develop, has been directly responsible for helping to unearth about AU$6 billion worth of previously undiscovered ore bodies.

Mining with bubbles

In the 19th century, miners at Broken Hill in far western New South Wales pioneered the use of bubbles to separate minerals from their ores. This ubiquitous technology was modernized in the 1980s with the creation of the Jameson Cell by Dr Graeme Jameson at the University of Newcastle and Mount Isa Mines. The Vigo and A.T. Massey coal companies in Indiana and West Virginia respectively are among hundreds of mines worldwide now using this system marketed by Xstrata Technologies.

Making virtual minerals

Researchers at the University of Sydney led by Professor Dietmar Müller are collaborating with colleagues at Caltech, the Scripps Institution of Oceanography and the University of Hawaii to develop a Virtual Geological Observatory. The facility will store data on rocks, processes and movements over geological time and use this information to simulate mineral formation. In future, this technology will help in the detection of mineral deposits underground.

New extraction technologies

Once a new mineral deposit has been found, the next challenge is to determine which minerals you can extract and at what cost. The Australian Nuclear Science and Technology Organisation (ANSTO) has for the past 30 years been helping mining companies assess and develop processes for uranium ores, extract rare earth metals, and remove radioactivity from ores. This work has contributed to mining projects around the world, including the US.

Mopping up gases

Dr Deanna D’alessandro. Credit: L’oreal/SDP media
Dr Deanna D’alessandro. Credit: L’oreal/SDP media

A bright young researcher in the area of carbon capture is Australian chemist Dr Deanna D’Alessandro. Dr D’Alessandro, who has returned to the University of Sydney as a postdoctoral research fellow after a postdoctoral fellowship at the University of California, Berkeley, has constructed crystals full of minute pores. One teaspoon of the most effective of her chemicals has the surface area of a football field. What’s more, the size and shape of the pores can be customized using light. So, she believes she can create molecular sponges that will mop up carbon dioxide, hydrogen, or almost any gas, and then release it on cue.

This is an part of a series of eight factsheets exploring US-Australian collaboration and outlining some of the ways that Australian science is contributing to America’s society and economy. You can download all of the factsheets as one PDF here.

  1. Overview: Innovation today means jobs and prosperity tomorrow. (Download PDF)
  2. Delivering sustainable agriculture and biosecurity. (Download PDF)
  3. Slivers of sun: clean energy and smarter mining. (Download PDF)
  4. Science collaboration improves health. (Download PDF)
  5. Understanding and responding to changing climate. (Download PDF)
  6. Traveling at Mach 5: Defense and materials science in action. (Download PDF)
  7. Searching the southern sky, and unchaining the internet. (Download PDF)
  8. The Australian science and technology system. (Download PDF)

Big ecology: From tundra to savanna

Why are some plant seeds very small and others large? Angela Moles tackled this simple question by compiling information on 12,669 plant species. She discovered that plant seeds in the tropics are, on average, 300 times bigger than seeds in colder places like the northern coniferous forests. She then used these data to follow the evolutionary history of seed size over hundreds of millions of years.

Angela Moles working with plants (Photo credit: L’Oréal/SDP Photo)
Angela Moles working with plants (Photo credit: L’Oréal/SDP Photo)

The study was the first of its kind and the results, published in Science and PNAS, have revolutionised our understanding of the factors that determine the size of offspring in plants and animals. Angela is a leader in developing a new approach to ecology—one that could allow us to accurately model and predict the impact of climate change on ecosystems.
Continue reading Big ecology: From tundra to savanna