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Home Uncategorized

Astronomers find possible planet outside Milky Way

Handshake 4u by Handshake 4u
November 4, 2021
in Uncategorized
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Astronomers using NASA’s Chandra X-ray Observatory have found evidence for a possible planet candidate in the M51 — “Whirlpool” — galaxy, and have said it potentially represents what would be the first planet seen to transit a star outside of the Milky Way.
The researchers used the Chandra X-ray Observatory to detect the dimming of X-rays from an “X-ray binary”, a system where a Sun-like star is in orbit around a neutron star or black hole. The authors interpret this dimming as being a planet passing in front of the neutron star or black hole, an official statement reads.
“Looking for the dimming of a star’s light as something passes in front of it is called the transit technique. For years, scientists have discovered exoplanets using transits with optical light telescopes, which detect the range of light humans can see with their eyes and more. This includes both ground-based telescopes and space-based ones like NASA’s Kepler mission. These optical light transit detections require very high levels of sensitivity because the planet is much smaller than the star it passes in front of, and, therefore, only a tiny fraction of the light is blocked,” the note reads.
The scenario of a transit in an X-ray binary is different, the astronomers said. And it’s because a potential planet is close in size to the X-ray source around the neutron star or black hole, a transiting planet passing along Earth’s line of sight could temporarily block most or all of the X-rays.
“This makes it possible to spot transits at greater distances — including beyond the Milky Way — than current optical light studies using transits,” the note reads.
The researchers have also released graphics and illustrations. The left panel of the graphic (see image) shows M51 in X-rays from Chandra (purple and blue) and optical light from NASA’s Hubble Space Telescope (red, green, and blue). A box marks the location of the possible planet candidate, an X-ray binary known as M51-ULS-1.
An artist’s illustration in the right panel depicts the X-ray binary and possible planet. Material from the companion star (white and blue in illustration) is pulled onto the neutron star or black hole, forming a disk around the dense object (illustrated as red and orange). The material near the dense object becomes superheated, causing it to glow in X-ray light (white). The planet is shown beginning to pass in front of this source of X-rays.
A separate graphic shows how X-rays from M51-ULS-1 temporarily decrease to zero during the Chandra observations.
“While this is a tantalizing study, the case of an exoplanet in M51 is not ironclad. One challenge is that the planet candidate’s large orbit in M51-ULS-1 means it would not cross in front of its binary partner again for about 70 years, thwarting any attempts for a confirming observation for decades. There is also the possibility that the dimming of X-rays is due to a passing cloud of gas near the M51-ULS-1, though the researchers think the data strongly favor the planet explanation,” the note reads.
The paper describing these results appears in the latest issue of Nature Astronomy. The authors are Rosanne DiStefano (CfA), Julia Berndtsson (Princeton), Ryan Urquhart (Michigan State University), Roberto Soria (University of the Chinese Science Academy), Vinay Kashap (CfA), Theron Carmichael (CfA), and Nia Imara (now at the University of California at Santa Cruz).
“NASA’s Marshall Space Flight Center manages the Chandra programme. The Smithsonian Astrophysical Observatory’s Chandra X-ray Center controls science from Cambridge Massachusetts and flight operations from Burlington, Massachusetts,” the note added.

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