Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:


When the dust clears: New observations of solar systems in the making

New observations with the SUBARU Telescope in Hawaii show the protoplanetary disks surrounding two young stars in unprecedented detail.

This is the first time that disk structures comparable in size to our own solar system have been resolved this clearly, revealing features such as rings and gaps that are associated with the formation of giant planets.

This image taken with the HiCIAO planet-hunter camera on SUBARU Telescope shows a bright arc of scattered light (white) from the protoplanetary disk around the young star LkCa 15 (center, masked out with a dark circle). The arc’s sharp inner edge traces the outline of a wide gap in the disk. The gap is decidedly lopsided – it is markedly wider on the left side – and has most likely been carved out of the disk by one or more newborn planets that orbit the star. Credit: MPIA (C. Thalmann) & NAOJ

The observations are part of a systematic survey to search for planets and disks around young stars using HiCIAO, a state-of-the-art high-contrast camera designed specifically for this purpose.

Planetary systems like our own share a humble origin as mere by-products of star formation. A newborn star's gravity gathers leftover gas and dust in a dense, flattened disk of matter orbiting the star. Clumps in the disk sweep up more and more material, until their own gravity becomes sufficiently strong to compress them into the dense bodies we know as planets. Recent years have seen substantial advances both in observations (mostly indirect) and in theoretical modeling of such »protoplanetary« disks. The two new observations have added intriguing new details, revealing some structures that had never before been seen directly.

One of the two studies targeted the star LkCa 15, which is located around 450 light-years from Earth in the constellation Taurus. At an age of a few million years, LkCa 15 is a young star – the Sun is a thousand times older. From previous observations of its infrared spectrum and its millimeter emissions, scientists had deduced the presence of a large gap in the center of its protoplanetary disk. The new images show starlight gleaming off the disk surface, clearly outlining the sharp edge of the gap for the first time. Most interestingly, the elliptical shape of the gap is not centered on the star, but appears lopsided.

»The most likely explanation for LkCa 15's disk gap, and in particular its asymmetry, is that one or more planets, freshly born from the disk material, have swept up the gas and dust along their orbits,« says Christian Thalmann, who led the study while on staff at the Max Planck Institute for Astronomy (MPIA). Intriguingly, the disk gap is sufficiently large to accommodate the orbits of all the planets in our own Solar System. It is therefore tempting to speculate that LkCa 15 might be in the process of forming an entire planetary system much like our own. »We haven't detected the planets themselves yet«, adds Thalmann. »But that may change soon.«

The second observation, led by Jun Hashimoto (National Observatory of Japan), targeted the star AB Aur in the constellation Auriga, at a distance of 470 light-years from Earth. This star is even younger, with an age of a mere one million years. The observations were the first to show details down to length scales comparable to the size of our own solar system – for comparison: At a distance of 470 light-years, the solar system has the same apparent size as a 1 Euro coin viewed at a distance of more than 10 km. They show nested rings of material that are tilted with respect to the disk's equatorial plane, and whose material, intriguingly, is not distributed symmetrically around the star – irregular features that indicate the presence of at least one very massive planet.

Both observations where made with the HiCIAO instrument at the 8.2 m SUBARU Telescope. Imaging a disk or planet close to a star is an enormous challenge, as it is very difficult to discern the light emitted by those objects in the star's intense glare. HiCIAO meets this challenge by correcting for the distorting influence of the Earth's atmosphere and by physically blocking out most of the star's light.

The observations are part of the SEEDS project, short for »Strategic Explorations of Exoplanets and Disks with SUBARU«. MPIA's managing director, Thomas Henning, one of the project's co-investigators, explains: »SEEDS is a five-year systematic search for exoplanets and protoplanetary disks. We are thrilled about the images the SUBARU telescope has produced as part of this project. Detailed observations like these are the key to understanding how planetary systems, including our own solar system, came into being.« SEEDS involves more than 100 researchers from 25 astronomical institutions in Asia (NAOJ and others), Europe (MPIA and others), and the US (Princeton University and others).


Prof. Dr. Thomas Henning (Co-Investigator, SEEDS)
Max Planck Institute for Astronomy, Heidelberg
Phone: (+49|0) 6221 – 528 200
Dr. Markus Pössel (Public Relations)
Max Planck Institute for Astronomy, Heidelberg
Phone: (+49|0) 6221 – 528 261
Background information
The results were published as
Thalmann, C. et al., »Imaging of a Transitional Disk Gap in Reflected Light: Indications of Planet Formation Around the Young Solar Analog LkCa 15« in Astrophysical Journal Letters 718, p. L87-L91

Hashimoto, J. et al., accepted for publication in Astrophysical Journal Letters in January 2011.

The SEEDS project team consists of about 100 researchers from 25 institutions in Japan, Europe and the US as well as in Taiwan. The participating institutions are: in Japan NAOJ, Graduate University of Advanced Studies, University of Air, Hokkaido University, Tohoku University, Ibaraki University, Saitama University, University of Tokyo, Tokyo Institute of Technology, ISAS, Kanagawa University, Nagoya University, Osaka University, Nagoya City College, Kobe University; in Europe: Max Planck Institute for Astronomy (Germany), University of Hertfordshire (UK), Université de Nice-Sophia Antipolis Parc Valrose (France), CSIC-INTA (Spain); in the US: Princeton University, University of Hawaii, NASA/JPL, NASA/Goddard, University of Washington, the College of Carleston; in Taiwan: Academia Sinica Institute of Astronomy and Astrophysics.

The research is supported by a Grant-in-Aid for Specially Promoted Research 22000005 from MEXT (Ministry of Education, Culture, Sports, Science and Technology of Japan).

Dr. Markus Pössel | Max-Planck-Institut
Further information:

More articles from Physics and Astronomy:

nachricht Move over, lasers: Scientists can now create holograms from neutrons, too
21.10.2016 | National Institute of Standards and Technology (NIST)

nachricht Finding the lightest superdeformed triaxial atomic nucleus
20.10.2016 | The Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: New 3-D wiring technique brings scalable quantum computers closer to reality

Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.

"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...

Im Focus: Scientists develop a semiconductor nanocomposite material that moves in response to light

In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.

A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...

Im Focus: Diamonds aren't forever: Sandia, Harvard team create first quantum computer bridge

By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.

"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...

Im Focus: New Products - Highlights of COMPAMED 2016

COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.

In 2016, the joint pavilion by the IVAM Microtechnology Network, the Product Market “High-tech for Medical Devices”, will be located in Hall 8a again and will...

Im Focus: Ultra-thin ferroelectric material for next-generation electronics

'Ferroelectric' materials can switch between different states of electrical polarization in response to an external electric field. This flexibility means they show promise for many applications, for example in electronic devices and computer memory. Current ferroelectric materials are highly valued for their thermal and chemical stability and rapid electro-mechanical responses, but creating a material that is scalable down to the tiny sizes needed for technologies like silicon-based semiconductors (Si-based CMOS) has proven challenging.

Now, Hiroshi Funakubo and co-workers at the Tokyo Institute of Technology, in collaboration with researchers across Japan, have conducted experiments to...

All Focus news of the innovation-report >>>



Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

Agricultural Trade Developments and Potentials in Central Asia and the South Caucasus

14.10.2016 | Event News

World Health Summit – Day Three: A Call to Action

12.10.2016 | Event News

Latest News

New method increases energy density in lithium batteries

24.10.2016 | Power and Electrical Engineering

International team discovers novel Alzheimer's disease risk gene among Icelanders

24.10.2016 | Life Sciences

New bacteria groups, and stunning diversity, discovered underground

24.10.2016 | Life Sciences

More VideoLinks >>>