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Hubble captures first ultraviolet image of exoplanets | Astronomy



Astronomers using NASA / ESA’s Hubble Space Telescope have photographed a still-Jupiter-sized planet around the orange dwarf PDS 70.This is the first time an exoplanet has been directly photographed in ultraviolet rays. UV)

This Hubble image shows a young exoplanet PDS 70b.Image Credit: Joseph DePasquale, STScI.

This Hubble image shows a young exoplanet PDS 70b.Image Credit: Joseph DePasquale, STScI.

PDS 70 is a primary precedence star of type K7, located 370 light years distant in the Centaurus constellation.

Also known as V * V1

032 Cen and IRAS 14050-4109, this star is only 5.4 million years old.

It is home to two forming planets, PDS 70b and c, and a large disk of dust and gas in areas of large particulate matter ranging from 20 to 40 AU.

PDS 70b is located within the disk gap at a distance of about 21 AU from the star, similar to the orbit of Uranus in our solar system.

PDS 70c is located near the outer edge of the disk gap at 34.5 AU from the star, similar to Neptune’s distance from our Sun.

“PDS 70 is very exciting because we are seeing the formation of planets. This is the youngest honest planet that Hubble has ever photographed firsthand, ”said Dr. Yifan Chou, an astronomer at the University of Texas at Austin.

Dr. Zhou and colleagues used Hubble’s Wide Field 3 (WFC3) camera instrument near UV / visible (UVIS) channel to observe PDS 70b.

“Hubble’s UV observations allow us to estimate how massive a planet is,” noted Dr. Zhou.

According to the team, PDS 70b is five times the mass of Jupiter over a period of 5.4 million years.

The rate of increase currently measured has diminished to the point that if the rate continues for the next million years, the planet will increase by about a hundredth of Jupiter’s mass.

“These observations are merely snapshots over time – more data is needed to determine if the rate at which the planet increases or decreases,” the astronomer said.

“Our measurements indicate that the planets are at the end of the formation process.”

The PDS 70b is surrounded by its own gas and dust disk, the material it absorbs from the larger disk of the PDS 70 system.

The researchers hypothesized that the magnetic field lines extend from the globular disk down to the exoplanet’s atmosphere and are channel materials on the planet’s surface.

“If this material traces the column from the disk to the planet, it creates a local hot spot,” said Dr. Zhou.

“These hot spots can be at least 10 times warmer than Earth’s temperature, and they are found to glow intensely in UV light.”

The research results appear in the file. Astronomical Journal.

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Yifan Zhou And faculty2021 Hubble Space Telescope Measuring UV and Hα radiation from young giant planets PDS 70b. AJ 161, 244; Doi: 10.3847 / 1538-3881 / abeb7a


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