A starry flare ten times more powerful than what was observed in our sun, broke out of a star with an ultracoder almost the same size as Jupiter.
The star is the coolest and the smallest that can give exceptional white light reflection, and with some definitions it may be too small to be considered a star.
The discovery, funded by the Science and Technology Council, is published in Monthly notifications for the Royal Astronomical Society: Letters as a version of the record today (April 17) and sheds light on the question of how small a star can be and still displays the active activity in its atmosphere. The rockets are thought to be driven by the sudden release of magnetic energy generated inside the star. This causes charged particles to heat the plasma on the surface of the star, releasing huge amounts of optical, UV and X-rays.
Leading author James Jackman, Doctor of Science. a student at the Department of Physics at the University of Warwick, said: "The activity of low mass stars is decreasing as you go to smaller and smaller masses and expect the chromosphere (region of the star that supports missiles) to cool down or weaker. It is a fact that we have observed this an incredibly low mass star, where the chromosphere should be almost the weakest, but we have a white light that shows that strong magnetic activity can stay up to this level.
"The right to the border is to be a star and a brown dwarf, a very small mass, a subterranean object, smaller in mass and definitely a brown dwarf. By pressing this limit we can see if these types of rockets are limited to stars and if it is So when this activity stops? This result takes us a long way to answer these questions. "
L The dwarf star that is located in 250 light-years, called ULAS J224940.13-011236.9, is only a tenth of the radius of our sun, almost the same size as Jupiter in our solar system. It was too weak for most telescopes to observe while researchers, led by the University of Warwick, noticed a massive starry explosion in its chromosphere in an optical overview of nearby stars.
Using the next-generation transit capacity (NGTS) of the European Observatory Paralel Observatory, with additional data from the 2MASS Survey and 2MASS Wide Field Infrared Survey Explorer (WISE), they monitored the brightness of the star 146 nights.
The flare occurred on the night of August 13, 2017 and pulled off the energy equivalent to 80 billion megaton TNT, ten times more energy than the Carrington event in 1859, the highest energy event recorded in our sun. The solar flares occur on our Sun regularly, but if the Sun flies like this star, the communications and energy systems of the Earth could be at a serious risk of failure.
It is one of the largest rockets ever seen on the L dwarf star, making the star appear 10,000 times brighter than the normal one.
James added: "We knew from other studies that such a star is there, and from the previous work we knew that these stars could show incredible flames. However, the smell star was too weak for our telescopes to normally see – t get enough light for the star to it appeared above the background of the sky. Only when it was fired up, it became light enough to reveal it to our telescopes. "
Dr James Professor Peter Whitley said: "Our twelve NGTS telescopes are commonly used to search for planets around bright stars, so it's exciting to find that we can also use them to find giant blasts of tiny stars. rockets can help us understand the origin of the planet's life. "
L dwarfs are among the lowest massive objects that can still be considered a star, lies in the transition region between stars and brown dwarfs. Brown dwarfs are not massive enough to merge hydrogen into helium as a star. L dwarfs are also very cool compared to more common stars of the main sequences, such as red dwarfs and radiating radiation most commonly in infrared, which can affect their ability to support the creation of life.
James adds: "The hot stars will be more emitting in the optical spectrum, especially toward UV. Because this star is a cooler, about 2,000 Kelvinas, and most of its light is towards infrared, when it's spreading, you get a blow from UV radiation that usually does not you see it.
"To get chemical reactions that go on any orbiting planet and form the amino acids that form the basis of life, you will need a certain level of UV radiation. These stars usually do not have this because they are most commonly released in infrared But if they produced a great reflection, such as this one, which can trigger some reactions. "
Professor Whitley adds: "It's incredible that such a minor star could produce such a powerful explosion. This discovery will make us think again of how small stars can store energy in magnetic fields. Now we are looking for giant rockets from other small stars and push on the boundaries of our understanding of the starry activity. "
Giant glare detected on the L dwarf
James A. G Jackman et al. Detection of a huge flash of white light on the L2.5 dwarf with the next-generation transit survey, Monthly notifications for the Royal Astronomical Society: Letters (2019). DOI: 10.1093 / mnrasl / slz039
Jupiter's explosion of a star is 10 times more powerful than ever seen in the sun (2019, April 17)
received April 17, 2019
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