Subscribe free to our newsletters via your
. 24/7 Space News .




Subscribe free to our newsletters via your




















EXO WORLDS
Variable Winds on Hot Giant Exoplanet Help Study of Magnetic Field
by Staff Writers
Tucson AZ (SPX) May 16, 2017


This image shows magnetic field lines in the atmosphere of a hot giant exoplanet. Time snapshot of magnetic field lines in the numerical simulation of a hot giant exoplanet atmosphere (a model of HD209458 b, but with a temperature structure similar to HAT-P-7 b). Magnetic field lines are colour-coded to represent the azimuthal (toroidal) magnetic field, with blue representing a negative-directed field (saturated at - 50 G) and magenta representing a positive-directed field (saturated at 50 G), with green and yellow ranging from - 5 to 5 G, respectively. The vantage point is looking onto the east-side terminator.

Senior Scientist Tamara M. Rogers of the Planetary Science Institute has discovered that substantial variability in the winds on the hot giant exoplanet HAT-P-7b are due to magnetism, and used those measurements to develop a new method to constrain the magnetic field of such an object.

HAT-P-7b was discovered by NASA's Kepler Mission in 2008. It is nearly 40 percent larger and nearly 80 percent more massive than Jupiter. It orbits its star every couple of days, and is so close that dayside temperature may be 2,200 degrees Kelvin (3,500 degrees Fahrenheit) with a night side 1,000 Kelvin (1,340 degrees Fahrenheit) cooler.

This strong day-night temperature difference drives strong eastward winds in the atmosphere and shifts the hottest temperature away from the point directly beneath the star on the dayside. However, this hot spot shifts significantly over time - even ending up on the west side of the sub-stellar point. This means that the winds are also changing significantly.

"The extreme temperatures of HAT-P-7b ionizes alkali metals such as lithium, sodium, and potassium, which results in the coupling of the atmosphere to a deep-seated magnetic field. Magnetic forces are able to then disrupt the strong eastward winds, leading to variable and even oppositely directed winds," Rogers said.

Rogers used a hydrodynamic model of the atmosphere in combination with a magnetohydrodynamic (MHD) model to reproduce the observed variations in the hot spot location, thereby setting a minimum value for the strength of the magnetic field of this planet at six times that of the Earth.

"Long timeline or multiple epoch observations of hot giant exoplanet phase curves coupled with MHD models of the atmospheres of these planets, can be used to place constraints on the magnetic field strengths of other hot giant exoplanets," Rogers said. "This will provide new insights into dynamo theory, planetary evolution and interpretations of star-planet magnetic interactions."

Research paper: "Constraints on the Magnetic Field Strengths of HAT-P-b and Other Hot Giant Exoplanets," Tamara M. Rogers, 2017 May 15, Nature Astronomy

EXO WORLDS
'Warm Neptune' Has Unexpectedly Primitive Atmosphere
Pasadena CA (JPL) May 15, 2017
A study combining observations from NASA's Hubble and Spitzer space telescopes reveals that the distant planet HAT-P-26b has a primitive atmosphere composed almost entirely of hydrogen and helium. Located about 437 light-years away, HAT-P-26b orbits a star roughly twice as old as the Sun. The analysis is one of the most detailed studies to date of a "warm Neptune," or a planet that is Nept ... read more

Related Links
Planetary Science Institute
Lands Beyond Beyond - extra solar planets - news and science
Life Beyond Earth

Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only

Comment using your Disqus, Facebook, Google or Twitter login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle

EXO WORLDS
ISS crew harvest new crop of vegetables grown in space

Joint Statement: The Fourth Meeting of the U.S.-Japan Comprehensive Dialogue on Space

One of first Soviet cosmonauts Gorbatko dies

Dem Senators call on Trump Admin to not cut NASA Education Progran funding

EXO WORLDS
N. Korea's 'new missile' has unprecedented range: experts

NASA Affirms Plan for First Mission of SLS, Orion

Mining the moon for rocket fuel to get us to Mars

SSL satellite built for Bulgaria Sat arrives at Cape Canaveral for FOR falcon 9 launch

EXO WORLDS
How hard did it rain on Mars

Deciphering the fluid floorplan of a planet

Mars Rover Opportunity Begins Study of Valley's Origin

Opportunity Reaches 'Perseverance Valley'

EXO WORLDS
A cabin on the moon? China hones the lunar lifestyle

China tests 'Lunar Palace' as it eyes moon mission

China to conduct several manned space flights around 2020

Reach for the Stars: China Plans to Ramp Up Space Flight Activity

EXO WORLDS
Satellite industry supports FCC proposal to reduce internet regulations for service providers

Allied Minds' portfolio company BridgeSat raises $6 million in Series A financing

AIA report outlines policies needed to boost the US Space Industry competitiveness

Blue Sky Network Targets Key Markets For Iridium SATCOM Solutions

EXO WORLDS
Arralis launches plug and play Ka band chipset

Revolutionary new sunscreen features melanin-mimicking nanoparticles

HP Enterprise unveils computer 'for era of Big Data'

"Airbus Friedrichshafen: new satellite hub lays groundwork for the future"

EXO WORLDS
Radio Detection of Lonely Planet Disk Shows Similarity with Stars

'Warm Neptune' Has Unexpectedly Primitive Atmosphere

Variable Winds on Hot Giant Exoplanet Help Study of Magnetic Field

ALMA eyes icy ring around young planetary system

EXO WORLDS
Hubble spots moon around third largest dwarf planet

NASA asks science community for Europa Lander Instruments ideas

Waves of lava seen in Io's largest volcanic crater

Not So Great Anymore: Jupiter's Red Spot Shrinks to Smallest Size Ever




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News






The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement