The name “intermediate luminosity red transents” or “Ilts” cannot be an astronomical term that you are familiar with, but these rare, glow-shift stars have been quite mystery in astronomical words.
Now, a team of cosmic detectives, who, has described their work as “a study in Scarlet” after the novel Arthur Conan Doyle, who first introduced the world to Sharalak Holmes, may have finally been torn down.
The world around the world suggests that Ilrts are stars that do not just burst when they reach the end of their lives, but “actually terminal” and destructive supernova explosions.
“After the discovery of three new ILRTs in 2019 in 2019, we seized an opportunity to study and understand these events,” Team leader and National Institute for Astrophysics (INAF) researcher Giorgio Valerin said in a statement. “So, we have collected data for years through many telescopes scattered around the world and even in the classroom.
“We have also resumed the NGC 300 OT observation campaign, which has been seen as close to ILRT ever, which is’ just six million ‘on’ just six million light-year.”
Ground-based equipment included La Palma, La Sila, Las Camponas and Asiagon, while James Web Space Telescope (JWST), Neel Gehls Swift Observatory (Swift), and Spitzer Space Telescope and data were also collected from space-based telescope including Spiter Space Telescope.
the sign of Four
Ilrts are somewhat misleading because their glow is between novas, the stellar explosion that the stars survive, and the “classical” supernova in which a huge star is destroyed, leaves a neutron star or a black hole.
The team reached its conclusions after seeing the development of four Ilrts. He hoped that this would help them determine whether Tara avoids these explosions or is completely erased.
The key to solving this mystery was observing Ilrts like NGC 300 OT for a long time.
“The first images of NGC 300 OT have returned to the 2008 date, and in this work, we have seen it again to study its development after more than ten years.” “The images and spectra analysis collected during these observation campaigns have allowed us to monitor development over the time of our goals, such as brightness, temperature, chemical composition and gas velocity associated with each ILRT we have studied.”
The NGC 300 OT’s Spitzer comments showed this ILRT to the tenth of the brightness of the ancestor star, which created the explosion during seven years. The images of the NGC 300 OT spitzer ended when they faded below the detection threshold of this NASA Space Telescope, which retired in 2020.
The way Holmes made his name investigating several cases, the team had another set of ILRT data.
Analyzing the JWS of ILRT at the 2019abn located in the nearby Galaxy Messier 51 (M51), he found that it is a transient to decline in shine in such a way that it is likely to faint fainted compared to its ancestor star and meet the same fate as NGC 300 OT.
From this information, the team concluded that the Ilrts are explosions that see the total destruction of a star. This is despite the fact that Ilrts seem to be quite weak compared to the “classical” core-torrent supernova.
The question is how they remain unconscious than similar supernova events?
Red hand league
The team of cosmic detectives suggests that the makeup of Iltrs may have a defined factor gas and dust shroud that surrounds the ancestor stars.
This cocoon is heated as a temperature of about 10,300 degrees Fahrenheit (5,700 ยฐ C) in a few days. The summit in temperature coincides with a peak in brightness for the Ilrt.
As this happens, the gas in this stellar shroud accelerates the great motion as 1.6 million mph (700 kilometers per second), which is about 1,000 times faster as the top speed of the Lockheed Martin F -16 jet fighter.
“This speed is definitely less than an explosion supernova, which often reaches 10,000 kilometers per second (22 million mph),” said Lyonardo Tartaglia, a team member and inaf researcher. “Nevertheless, we believe that Tara can actually explode, throwing materials in thousands of kilometers per second in every direction, but that the explosion was partially choking with dense blankets of gas and dust around the stars, which is heated as a result of violent effects.”
Thus, the launch of the material from around the stellar ancestors of Ilrts can explain how they reduce brightness for a long time.
Final problem
The team called the event “Electron Capture Supernova”, a type of stellar explosion, which has been given long -term theory, but is believed to have not been observed.
Electron-captures are very interested in supernova astronomers because they mark a range between the stars of about 10 solar masses and more that explode to leave the black hole and neutron stars in supernova, and the stars with the public like the sun do not “No Nova”, but are distant as white dwarf stellers.
“We are finally looking at the events that are in luck to explode different stars as classical supernova from stars that will gradually go away as white dwarfs,” said Valerin.
Perhaps the team will agree with Holmes’ words with the signal of four: “When you have eliminated the impossible, whatever remains, although impossible, the truth must be!”
Was published in team research Two paper On March 7 in Journal Astronomy and Astronomy Physics.
