Science Current Events | Science News | Brightsurf.com
 

Record-Breaking Radio Waves from Ultra-Cool Star

April 30, 2012
Penn State University astronomers using the world's largest radio telescope, at Arecibo, Puerto Rico, have discovered flaring radio emissions from an ultra-cool star, not much warmer than the planet Jupiter, shattering the previous record for the lowest stellar temperature at which radio waves were detected.

The team from Penn State's Department of Astronomy and Astrophysics and the Center for Exoplanets and Habitable Worlds, led by Alex Wolszczan, the discoverer of the first planets ever found outside our solar system, has been using the giant 305-m (1000-ft) telescope to look for radio signals from a class of objects known as brown dwarfs. These objects are small, cold stars that bridge the gap between Jupiter-like giant planets and normal, more-massive, hydrogen-fusing stars. The astronomers hit the jackpot with a star named J1047+21, a brown dwarf 33.6 light years away in the constellation Leo, in a result that could boost the odds of discovering life elsewhere in the universe.

Matthew Route, a graduate student at Penn State and the lead author of the discovery paper, said, "This object is the coolest brown dwarf ever detected emitting radio waves -- it's half the temperature of the previous record holder, making it only about five times hotter than Jupiter."

The new radio-star is much smaller and colder than our Sun. With a surface temperature not much higher than that of a giant planet, and a size comparable to Jupiter's, it is scarcely visible in optical light. Yet the radio flares seen at Arecibo show it must have a strong magnetic field, implying that the same could be true of other similar stars.

Wolszczan, an Evan Pugh Professor of Astronomy and Astrophysics and the leader of the project, said, "This is a really exciting result. We hope that in the future we'll be able to detect yet colder brown dwarfs, and possibly even giant planets around other stars."

The possibility that young, hot planets around other stars could be detected in the same manner -- because they still maintain strong magnetic fields -- has implications for the chances of finding life elsewhere in our Milky Way Galaxy, Wolszczan explained. "The Earth's field protects life on its surface from harmful particles of the solar wind. Knowing whether planetary magnetic fields are common or not throughout the Galaxy will aid our efforts to understand chances that life may exist beyond the Solar System."

The discovery of radio signals from J1047+21 dramatically broadens the window through which astronomers can study the atmospheres and interiors of these tiny stars, using the radio detection of their magnetic fields as a tool. At the temperature of this brown dwarf, its atmosphere must be made of neutral gas, which would not give off radio signals like those seen. SO The energy to drive the signals is likely to come from magnetic fields deep inside the star, similar to the field that protects the Earth from dangerous high-energy particles. By monitoring the radio flares from J1047+21, astronomers will be able to tell how stable the magnetic field is over time, and, from flare duration, they can infer the size of the emitter itself. The results were published in the March 10 2012 edition of the Letters section of the Astrophysical Journal.

The Arecibo Observatory is operated by SRI International under a cooperative agreement with the National Science Foundation (AST-1100968), and in alliance with Ana G. Méndez-Universidad Metropolitana, and the Universities Space Research Association.

The Pennsylvania State University


Related Magnetic Fields Current Events and Magnetic Fields News Articles


Mercury's magnetic field tells scientists how its interior is different from Earth's
Earth and Mercury are both rocky planets with iron cores, but Mercury's interior differs from Earth's in a way that explains why the planet has such a bizarre magnetic field, UCLA planetary physicists and colleagues report.

The quantum Cheshire cat
The Cheshire Cat featured in Lewis Caroll's novel "Alice in Wonderland" is a remarkable creature: it disappears, leaving its grin behind. Can an object be separated from its properties?

Low Strength Brain Stimulation May Be Effective for Depression
Brain stimulation treatments, like electroconvulsive therapy (ECT) and transcranial magnetic stimulation (TMS), are often effective for the treatment of depression. Like antidepressant medications, however, they typically have a delayed onset. For example, a patient may receive several weeks of regular ECT treatments before a full response is achieved.

Highly charged ions
The world is mostly neutral. That is, most of the atoms in our environment are electrically neutral.

NASA's Van Allen Probes Show How to Accelerate Electrons
One of the great, unanswered questions for space weather scientists is just what creates two gigantic donuts of radiation surrounding Earth, called the Van Allen radiation belts. Recent data from the Van Allen Probes -- two nearly identical spacecraft that launched in 2012 -- address this question.

Out of An Hours-long Explosion, A Stand-In For The First Stars
Astronomers analyzing a long-lasting blast of high-energy light observed in 2013 report finding features strikingly similar to those expected from an explosion from the universe's earliest stars.

A hotspot for powerful cosmic rays
An observatory run by the University of Utah found a "hotspot" beneath the Big Dipper emitting a disproportionate number of the highest-energy cosmic rays. The discovery moves physics another step toward identifying the mysterious sources of the most energetic particles in the universe.

Reigning in chaos in particle colliders yields big results
When beams with trillions of particles go zipping around at near light speed, there's bound to be some chaos. Limiting that chaos in particle colliders is crucial for the groundbreaking results such experiments are designed to deliver.

Watching individual neurons respond to magnetic therapy
Engineers and neuroscientists at Duke University have developed a method to measure the response of an individual neuron to transcranial magnetic stimulation (TMS) of the brain.

UMMS scientists show that monarch butterflies employ a magnetic compass during migration
Each fall millions of monarch butterflies use a sophisticated navigation system to transverse 2,000 miles from breeding sites across the eastern United States to an overwintering habitat in specific groves of fir trees in central Mexico.
More Magnetic Fields Current Events and Magnetic Fields News Articles

Magnetic Fields

Magnetic Fields
by Ron Loewinsohn (Author)


Organized around the idea that "you can't know what a magnetic field is like unless you're inside of it," Ron Loewinsohn's first novel opens from the disturbing perspective of a burglar in the midst of a robbery and travels through the thoughts and experiences (both real and imaginary) of a group of characters whose lives are connected both coincidentally and intimately. All of the characters have a common desire to imagine and invent rather horrifying stories about the lives of people around them.As the novel develops, certain phrasings and images recur improbably, drawing the reader into a subtle linguistic game that calls into question the nature of authorship, the ways we inhabit and invade each other's lives, and the shape of fiction itself.

Magnetic Fields' 69 Love Songs: A Field Guide (33 1/3)

Magnetic Fields' 69 Love Songs: A Field Guide (33 1/3)
by LD Beghtol (Author), Ken Emerson (Introduction)


<div><br/><div>A fully illustrated oral history of the Magnetic Fields' 1999 triple album, <em>69 Love Songs</em> - an album that was afforded "classic" status by many almost as soon as it was released. LD Beghtol's book is chatty, incestuous, funny, dark, digressive, sexy, maddening, and delightful in equal measures. It documents a vital and influential scene from the inside, involving ukuleles and tears, citations and footnotes, analogue drum machines, and floods of cognac. Oh, and a crossword puzzle too.</div><br/><div> </div><br/><div>The centre of the book is the secret history of these tuneful, acerbic, and sometimes heartbreaking songs of old love, new love, lost love, punk rock love, gay love,...

The Magnetic Fields

The Magnetic Fields
by André Breton (Author), Philippe Soupault (Author), David Gascoyne (Translator)


tr David Gascoyne

Faraday, Maxwell, and the Electromagnetic Field: How Two Men Revolutionized Physics

Faraday, Maxwell, and the Electromagnetic Field: How Two Men Revolutionized Physics
by Nancy Forbes (Author), Basil Mahon (Author)


The story of two brilliant nineteenth-century scientists who discovered the electromagnetic field, laying the groundwork for the amazing technological and theoretical breakthroughs of the twentieth century

Two of the boldest and most creative scientists of all time were Michael Faraday (1791-1867) and James Clerk Maxwell (1831-1879). This is the story of how these two men - separated in age by forty years - discovered the existence of the electromagnetic field and devised a radically new theory which overturned the strictly mechanical view of the world that had prevailed since Newton's time.

The authors, veteran science writers with special expertise in physics and engineering, have created a lively narrative that interweaves rich biographical detail from each man's life...

Magnetic Resonance Imaging: Physical Properties and Sequence Design

Magnetic Resonance Imaging: Physical Properties and Sequence Design
by Robert W. Brown (Author), Y.-C. Norman Cheng (Author), E. Mark Haacke (Author), Michael R. Thompson (Author), Ramesh Venkatesan (Author)


New edition explores contemporary MRI principles and practicesThoroughly revised, updated and expanded, the second edition of Magnetic Resonance Imaging: Physical Principles and Sequence Design remains the preeminent text in its field. Using consistent nomenclature and mathematical notations throughout all the chapters, this new edition carefully explains the physical principles of magnetic resonance imaging design and implementation. In addition, detailed figures and MR images enable readers to better grasp core concepts, methods, and applications.Magnetic Resonance Imaging, Second Edition begins with an introduction to fundamental principles, with coverage of magnetization, relaxation, quantum mechanics, signal detection and acquisition, Fourier imaging, image reconstruction, contrast,...

Know Your Magnetic Field

Know Your Magnetic Field
by William E. Gray (Author)


One of the mainstays of New Thought has been the concept that diseases can be healed using mental abilities inherent in everyone. This book describes the mechanics of mind/body healing in simple terms.

Visualising Magnetic Fields: Numerical Equation Solvers in Action

Visualising Magnetic Fields: Numerical Equation Solvers in Action
by John Stuart Beeteson (Author)


Visualizing Magnetic Fields: Numerical Equation Solvers in Action provides a complete description of the theory behind a new technique, a detailed discussion of the ways of solving the equations (including a software visualization of the solution algorithms), the application software itself, and the full source code. Most importantly, there is a succinct, easy-to-follow description of each procedure in the code.

The physicist Michael Faraday said that the study of magnetic lines of force was greatly influential in leading him to formulate many of those concepts that are now so fundamental to our modern world, proving to him their "great utility as well as fertility." Michael Faraday could only visualize these lines in his mind's eye and, even with modern computers to help us, it...

The Field: The Quest for the Secret Force of the Universe

The Field: The Quest for the Secret Force of the Universe
by Lynne McTaggart (Author)


In this groundbreaking classic, investigative journalist Lynne McTaggart reveals a radical new paradigm—that the human mind and body are not separate from their environment but a packet of pulsating power constantly interacting with this vast energy sea, and that consciousness may be central in shaping our world. The Field is a highly readable scientific detective story presenting a stunning picture of an interconnected universe and a new scientific theory that makes sense of supernatural phenomena. Documented by distinguished sources, The Field is a book of hope and inspiration for today's world.

Magnetic Field Therapy Handbook: Balancing Your Energy Field

Magnetic Field Therapy Handbook: Balancing Your Energy Field
by Walls (Author)


Book by Walls

Ultra-Low Field Nuclear Magnetic Resonance: A New MRI Regime

Ultra-Low Field Nuclear Magnetic Resonance: A New MRI Regime
by Robert Kraus (Author), Michelle Espy (Author), Per Magnelind (Author), Petr Volegov (Author)


This book is designed to introduce the reader to the field of NMR/MRI at very low magnetic fields, from milli-Tesla to micro-Tesla, the ultra-low field (ULF) regime. The book is focused on applications to imaging the human brain, and hardware methods primarily based upon pre-polarization methods and SQUID-based detection. The goal of the text is to provide insight and tools for the reader to better understand what applications are best served by ULF NMR/MRI approaches. A discussion of the hardware challenges, such as shielding, operation of SQUID sensors in a dynamic field environment, and pulsed magnetic field generation are presented. One goal of the text is to provide the reader a framework of understanding the approaches to estimation and mitigation of low signal-to-noise and long...

© 2014 BrightSurf.com