Science & Technology

First detection of X-rays from Tenno

The first X-rays from Tenno were captured by Chandra during observations taken in 2002 and 2017. This is a discovery that may help scientists learn more about this ice giant planet. Credit: X-ray: NASA / CXO / University College London / W. Dunn et al; Optics: WM Keck Observatory

  • Astronomers Announced First Detection of X-rays From Uranus..
  • Uranus, the seventh planet from the Sun, is an ice giant planet outside the solar system.
  • my favorite Jupiter And SaturnUranus and its rings appear to generate X-rays primarily by scattering the Sun’s X-rays, but some come from the aurora.
  • Chandra observations from 2002 and 2017 were used for this discovery.

Astronomers were the first to detect X-rays from Tenno. NASAChandra X-ray Observatory. This result may help scientists learn more about this mysterious ice giant in our solar system.

Uranus is the seventh planet from the Sun and has two sets of rings around the equator. Planets that are four times the diameter of the Earth rotate on their sides and differ from all other planets in the solar system.Astronomers are now Chandra and because Voyager 2 was the only spacecraft that Uranus has ever flown. Hubble Space TelescopeTo learn about this distant and cold planet, which is almost entirely composed of hydrogen and helium.

In the new study, researchers used Chandra observations made on Uranus in 2002 and 2017. They confirmed that X-rays were clearly detected from the first observations analyzed recently, and that 15 observations could cause X-ray flare. A few years later. The main figure shows the 2002 Uranus Chandra X-ray image (pink) overlaid on an optical image from the Keck-I telescope obtained in another study in 2004. The latter indicates that the planets are in about the same direction. Chandra is being observed in 2002.

Uranus HRC composite image

2017 HRC composite image. Credit: X-ray: NASA / CXO / University College London / W. Dunn et al; Optics: WM Keck Observatory

What causes Uranus to emit X-rays? Answer: Mainly the sun. Astronomers have observed that both Jupiter and Saturn scatter the X-ray light emitted by the Sun in the same way that the Earth’s atmosphere scatters the Sun’s light. The authors of the new Uranus study initially predicted that most of the detected X-rays were due to scattering, but there is an interesting hint that there is at least one other source of X-rays. If further observation confirms this, it may have intriguing implications for understanding Uranus.

One possibility is that the ring of Uranus is itself producing X-rays. This is the case for Saturn’s ring. Uranus is surrounded by charged particles such as electrons and protons in the nearby space environment. When these energy particles collide with the ring, the ring can glow with x-rays. Another possibility is that at least some of the X-rays come from the aurora of Uranus. This is a phenomenon previously observed on this planet at other wavelengths.

On Earth, you can see in the sky a colorful light show called the aurora that occurs when high-energy particles interact with the atmosphere. X-rays are emitted by the aurora of the earth. The aurora travels down the planet’s lines of magnetic force to the poles, is decelerated by the atmosphere, and is then produced by high-energy electrons. Jupiter also has an aurora. X-rays from Jupiter’s aurora are emitted from two sources: electrons that travel through magnetic field lines like the Earth, and positively charged atoms and molecules that fall on Jupiter’s polar regions. However, scientists are not very sure what causes Uranus to have an aurora. Chandra’s observations may help unravel this mystery.

Uranus is a particularly interesting target for X-ray observations because of its unusual spin axis and magnetic field direction. The axes of rotation and magnetic fields of other planets in the solar system are approximately perpendicular to their orbital planes, while the axes of rotation of Uranus are approximately parallel to the path around the Sun. In addition, while Uranus is tilted sideways, its magnetic field is tilted by a different amount, offset from the center of the planet. This can cause the aurora to be unusually complex and fluctuating. Identifying the source of X-rays from Tenno helps astronomers better understand how more exotic objects in the universe, such as growing black holes and neutron stars, emit X-rays. ..

Reference: “Low signal detection of X-rays from Tenno” by WR Dunn and J.-U. Ness, L. Lamy, GR Tremblay, G. Branduardi-Raymont, B. Snios, RP Kraft, Z. Yao, AD Wibisono, March 31, 2021 Journal of Geophysical Research..
DOI: 10.1029 / 2020JA028739

A paper explaining these results is published in the latest issue. Journal of Geophysical Research.. Authors are William Dunn (University College London, UK), Jan Wuwe Ness (Marseille University, France), Laurent Ramie (Paris Observatory, France), Grant Trenbray (Astrophysics Center | Harvard & Smithsonian) ), Graziera Branduardi-Raymont (University College London), Bradford Snios ()CfA), Ralph Craft (CfA), Z. Yao (Chinese Academy of Sciences, Beijing), Aferia Wibisono (University College London).

NASA’s Marshall Space Flight Center manages the Chandra program. The Smithsonian Astrophysical Observatory’s Chandra X-ray Center manages science in Cambridge, Massachusetts and flight operations in Burlington, Massachusetts.



First detection of X-rays from Tenno

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