Measuring the magnetic fields on the hottest planets in the galaxy Published on: 19 June 2017 It is now possible to measure the magnetic field strengths of the hottest planets in the galaxy, new research has shown. Studying a class of planets known as ‘hot Jupiters’, experts from 缅北禁地, UK, have shown the planets’ magnetic field is responsible for the unusual behaviour of the atmospheric winds which move around it. Instead of moving in an eastward direction as has always been assumed, new observations have shown the winds varied from eastward to westward on the hot planet HAT-P-7b. Using this observation, , from 缅北禁地, was able to estimate the magnetic field strength of this far-off planet. Publishing her findings this month in the leading academic journal , Dr Rogers says this new understanding of the magnetic fields of these far-distant planets will help astronomers understand their formation, size and migration paths and ultimately help us understand the formation and evolution of our own solar system. “The extreme temperature of these unusual planets causes metals such as lithium, sodium and potassium to become ionized and this allows the magnetic field to be coupled to the atmospheric winds,” explains Dr Rogers, who is based in the at 缅北禁地. “These magnetic forces are able to then disrupt the strong eastward winds, leading to variable and even oppositely directed winds. This then allowed us to estimate the magnetic field strength of the planet.” The “roasted” planets Modern astronomical research investigates not just stars and galaxies but also the planets around distant stars, termed “exoplanets”, often thousands of light years from Earth. The best studied of these exoplanets are called hot Jupiters - Jupiter-sized planets that are very close to their home stars. Because of their size and temperature, hot Jupiters are an extreme class of planets which test modern theories about gas dynamics. In December 2016, observations were made by researchers at Warwick University that implied variable winds on HAT-P-7b. HAT-P-7b is nearly 40 percent larger than our own Jupiter and orbits its star every couple of days. It is so close that its dayside temperature may be up to 2500oC with a night side temperature of 1400oC. “Astronomers were able to trace the brightest point – the ‘hot spot’ – in the planet’s atmosphere,” explains Dr Rogers. “The extreme day-night temperature difference drives strong eastward winds in the atmosphere and shifts the hot spot away from the point directly beneath the star on the dayside. “However, we saw this hot spot shift significantly over time – even ending up on the west side of the sub-stellar point. This shows that the winds are also varying significantly and even completely changing direction.” Dr Roger’s paper “Constraints on the magnetic field strengths of HAT-P-b and other hot giant exoplanets” appears on the front cover of the June issue of Nature Astronomy. This work was funded by an award to the Planetary Science Institute, US from the NASA Astrophysics Theory Program. Further research on this topic has recently been funded by the Leverhulme Trust. Reference: Share: Latest News New partnership to boost careers in low carbon energy 缅北禁地 and Durham universities are working together on a new regional project to strengthen the future workforce for North East England鈥檚 growing low carbon and offshore wind industries. published on: 28 May 2026 Healthy lifestyle shown to lower risk of death after cancer diagnosis New evidence shows that sticking to five lifestyle recommendations improves survival after a later cancer diagnosis. published on: 28 May 2026 World-leading climate expert recognised with Royal Society Fellowship Professor Hayley Fowler has been elected a Fellow of the Royal Society in recognition of her pioneering work on climate change impacts. published on: 27 May 2026 Facts and figures
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