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


Electrons moving in a magnetic field exhibit strange quantum behavior
The dynamic behavior of electrons in magnetic fields is crucial for understanding physical processes, such as the quantum Hall effect, which are important in many areas of solid state physics, including electrical conductivity. Yet, there is much that remains unknown about exactly how electrons behave in a magnetic field.

New material structures bend like microscopic hair
MIT engineers have fabricated a new elastic material coated with microscopic, hairlike structures that tilt in response to a magnetic field.

On-chip topological light
Topological transport of light is the photonic analog of topological electron flow in certain semiconductors.

'Active' surfaces control what's on them
Researchers at MIT and in Saudi Arabia have developed a new way of making surfaces that can actively control how fluids or particles move across them.

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.
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,...

Magnetic Healing: Advanced Techniques for the Application of  Magnetic Forces

Magnetic Healing: Advanced Techniques for the Application of Magnetic Forces
by Buryl Payne (Author)


This book shows how magnetic forces help the body to heal itself by stimulating the biochemistry of the body so natural healing can take place.

The Magnetic Fields

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


tr David Gascoyne

The Tesla Rotating Magnetic Field

The Tesla Rotating Magnetic Field
by Thomas Commerford Martin (Author), Nikola Tesla (Author)


This scarce antiquarian book is a facsimile reprint of the original. Due to its age, it may contain imperfections such as marks, notations, marginalia and flawed pages. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions that are true to the original work.

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,...

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...

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.

Electricity and Magnetism: An Introduction to the Theory of Electric and Magnetic Fields, 2nd edition

Electricity and Magnetism: An Introduction to the Theory of Electric and Magnetic Fields, 2nd edition
by Oleg D. Jefimenko (Author)


This textbook of electromagnetic theory, written for an advanced undergraduate course, is characterized by its pedagogical excellence and by an abundance of novel material, problems, and illustrative examples based on the author's original research and on his contributions to Maxwell's theory of electric and magnetic phenomena. Among the many unique and novel features of the book are: author's solutions of Maxwell's equations (now referred to in the scientific literature as the "Jefimenko's equations"), a comprehensive treatment of vector-analytical operations involving retarded field integrals, a detailed discussion of electric fields outside current-carrying conductors, spectacular line-of-force photographs of electric fields inside and outside current-carrying media, calculations of...

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.

© 2014 BrightSurf.com