5400mph winds discovered hurtling around exoplanet

November 13, 2015
HD189733: The planet HD 189733b is shown here in front of its parent star. A belt of wind around the equator of the planet travels at 5400mph from the heated day side to the night side. The day side of the planet appears blue due to scattering of light from silicate haze in the atmosphere. The night side of the planet glows a deep red due to its high temperature. Credit: Mark A. Garlick/University of Warwick

Winds of over 2km per second have been discovered flowing around planet outside of the Earth's solar system, new research has found.

The University of Warwick discovery is the first time that a weather system on a planet outside of Earth's solar system has been directly measured and mapped.

The wind speed recorded is 20x greater than the fastest ever known on earth, where it would be seven times the speed of sound.

Commenting on the discovery lead researcher Tom Louden, of the University of Warwick's Astrophysics group, said:

"This is the first ever weather map from outside of our solar system. Whilst we have previously known of wind on exoplanets, we have never before been able to directly measure and map a weather system."

Discovered on the exoplanet HD 189733b, the Warwick researchers measured the velocities on the two sides of HD 189733b and found a strong wind moving at over 5400mph blowing from its dayside to its night side. Mr Louden explains:

"HD 189733b's velocity was measured using high resolution spectroscopy of the Sodium absorption featured in its atmosphere. As parts of HD 189733b's atmosphere move towards or away from the Earth the Doppler effect changes the wavelength of this feature, which allows the velocity to be measured".

Explaining how this information was used to measure velocity Mr Louden says:

"The surface of the star is brighter at the centre than it is at the edge, so as the planet moves in front of the star the relative amount of light blocked by different parts of the atmosphere changes. For the first time we've used this information to measure the velocities on opposite sides of the planet independently, which gives us our velocity map."

5400mph winds discovered hurtling around exoplanet
The planet is shown at three positions as it crosses its parent star. The changing background illumination allows us to separate absorption from different parts of the planetary atmosphere. By measuring the Doppler shift of the absorption we are able to measure wind velocities. The blue-shaded region of the atmosphere is moving toward the Earth at 12,000 mph, while the red-shaded region is moving away from the earth at 5,000 mph. After correcting for the expected spin of the planet we measure a wind velocity of 5400 mph on the blue side, indicating a strong eastward wind flow from the heated day side to the night side of the planet.

The researchers say that the techniques used could help the study of Earth-like planets. Co-researcher, Dr Peter Wheatley of the University of Warwick's Astrophysics Group explains:

"We are tremendously excited to have found a way to map weather systems on distant planets. As we develop the technique further we will be able to study wind flows in increasing detail and make maps of smaller planets. Ultimately this technique will allow us to image the on Earth-like planets. "

HD 189733b is one of the most studied of a class of known as 'Hot Jupiters'. At over 10% larger than Jupiter, but 180x closer to its star, HD 189733b has a temperature of 1800'C. Its size and relatively closeness to our make it a popular target for astronomers. Past research has shown that the day side of the planet would appear a bright shade of blue to the human eye, probably due to clouds of silicate particles high in its atmosphere.

The data was collected by HARPS, the High Accuracy Radial Planet Searcher, in La Silla, Chile.

The research, Spatially resolved eastward winds and rotation of HD 189733b, is published by The Astronomical Journal Letters.

Explore further: Hazy red sunset on extrasolar planet

More information: Spatially resolved eastward winds and rotation of HD 189733b, The Astronomical Journal Letters. arxiv.org/abs/1511.03689

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17 comments

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Torbjorn_Larsson_OM
5 / 5 (7) Nov 13, 2015
We will need an Exoplanet Weather Service.
Whydening Gyre
5 / 5 (9) Nov 13, 2015
We will need an Exoplanet Weather Service.

Weather.com will load even slower, now...
antialias_physorg
4.6 / 5 (10) Nov 13, 2015
We will need an Exoplanet Weather Service.


Hmm. I put in the surface temperature and air speed into the wind chill factor calculator
http://mste.illin...d_chill/

Result:

Wind chill factor:-278359 ..."Brrr...It's Cold....Bundle Up"
Hat1208
5 / 5 (7) Nov 13, 2015
@antialias_physorg

You have a whimsical side, who knew, it's nice to see.
Enthusiastic Fool
5 / 5 (5) Nov 13, 2015
I wonder what wind that moves faster than the speed of sound sounds like rushing past.
mrbeardy13
5 / 5 (6) Nov 13, 2015
I wonder what wind that moves faster than the speed of sound sounds like rushing past.


Whatever shredding eardrums sounds like!
Captain Stumpy
5 / 5 (7) Nov 14, 2015
I wonder what wind that moves faster than the speed of sound sounds like rushing past.
@Enthusiastic Fool
just a quick guess based upon supersonic flight of everything from a jet at low altitude to supersonic bullets... you wouldn't hear it and then you would be smashed by the wind (and the damage to the body would be dependent upon your movement and protection, etc)

.

Hmm. I put in the surface temperature and air speed into the wind chill factor calculator
@AA_P
ROTFLMFAO

.

Weather.com will load even slower, now
@Whyde
yeah... i am still waiting for yesterdays forecast so i can plan my trip i just got back from
antialias_physorg
5 / 5 (8) Nov 14, 2015
@AA_P
ROTFLMFAO

...and the post served it's second purpose (showing - by the votes - that Zeph's back. It was good while it lasted. But I'm sure he'll get banned faster this time around.)
Lex Talonis
1.4 / 5 (9) Nov 14, 2015
Retard American SCIENTIST, measures, calculates and publishes in IMPERIAL measurments, instead of METRIC.

Dumb cunt.
Captain Stumpy
5 / 5 (5) Nov 14, 2015
@lex
you do know that the article was not written by the authors of the study, right? and an article is NOT the same as a study, right?
Dumb cunt
not females, you illiterate idiot- Tom Louden and Peter J. Wheatley
Retard American SCIENTIST
Ummm... another epic fail?
Department of Physics
University of Warwick
Coventry, CV4 7AL, UK
measures, calculates and publishes in IMPERIAL measurments, instead of METRIC
OMG, really? from the abstract
... with a redshift of 2.3+1.3−1.5kms−1 on the leading limb of the planet and a blueshift of 5.3+1.0−1.4kms−1
http://arxiv.org/...11.03689

so...
are you completely illiterate, being intentionally stupid or did you just completely refuse to read anything?

.

I'm sure he'll get banned faster this time around
@AA_P
not really
already reported all of her [zeph's] socks, but the site isn't doing anything about it
tracking new ones too

apparently the site makes $$ off of z
gwrede
2 / 5 (4) Nov 14, 2015
Well, even this site lives on advertising, most of which targets American readers. Therefore, unfortunately, many of the articles show measures in US Customary Units, even if the original text has them in sane and usable units.

Fortunately, most of us in the ("tiny" ??) Rest of The World can convert units like miles, pounds and PSI to sane units in their head.

Browsing FAA crash reports tells us that people losing their lives simply because of hiccups caused by the funny and idiosyncratic American systems of measure, are no rare exception.

If the Russians were as arrogant as the Americans, there'd be no end to tort about the Americans missing Mars several times in a row simply because someone or other got miles and kilometers mixed up.

gculpex
1 / 5 (2) Nov 15, 2015
63 ly away, even with daily forecasts it would be useless when (or if) I got there!
EnsignFlandry
3.7 / 5 (3) Nov 16, 2015
Well, even this site lives on advertising, most of which targets American readers. Therefore, unfortunately, many of the articles show measures in US Customary Units, even if the original text has them in sane and usable units.

Fortunately, most of us in the ("tiny" ??) Rest of The World can convert units like miles, pounds and PSI to sane units in their head.

Browsing FAA crash reports tells us that people losing their lives simply because of hiccups caused by the funny and idiosyncratic American systems of measure, are no rare exception.

If the Russians were as arrogant as the Americans, there'd be no end to tort about the Americans missing Mars several times in a row simply because someone or other got miles and kilometers mixed up.



Mars was missed once as a result of using the wrong units. Americans aren't any more arrogant than Russians, or British, or French. You seem to hate yourself.
EnsignFlandry
5 / 5 (2) Nov 16, 2015
We will need an Exoplanet Weather Service.


We will need a new hurricane scale too. Category 5 just won't cut it.
EnsignFlandry
5 / 5 (3) Nov 16, 2015
Retard American SCIENTIST, measures, calculates and publishes in IMPERIAL measurments, instead of METRIC.

Dumb cunt.


American scientists use the metric system like all scientists. The people who write these articles for Phys.Org translate them into other units. "Dumb cunt" is a really intelligent comment, don't ya think? It really makes you feel better to knock other people. Pathetic.
SuperThunder
3.4 / 5 (5) Nov 17, 2015
A whole planet ripe for 80's feathered haircuts.
sizzlerjoe1
not rated yet Dec 26, 2015
i bet the planet isn't that old, probably formed in last 10 mill yrs. question is, does it have a solid surface or core ? probably Not.. winds that high are expected, If any of our gas planets were 180x's closer to our sun, their winds would go Much faster as well.

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