The young brown dwarf mated on the playground. Astronomers have found evidence of a low-quality companion, a low-mass brown dwarf, or a giant planet, a member of the young star cluster Pleiades, which orbits around Rub 12. Artist’s impression of the Roque 12 binary system in the Pleiades group.
The Pleiades are an open star cluster in the constellation Taurus at a distance of 440 light years from Earth. Also known as the Seven Sisters and Messier 45, it includes more than 800 stars and dozens of free-floating brown dwarfs with an age of approximately 120 million years.
The combination of its inflation and youth makes its brown dwarfs cool down quickly and easy to spot. The brown dwarf stopped 12 for the first time in 1998 by the Dr. Uppsala Astronomical Observatory. He was seen by Leaf Festin.
Also known as NPL 36, BPL 172, and EPIC 211090981 in various lists, the spectral type of the object is M7.5 and Jupiter has a mass of 63 times. Now astronomer Alex Scholz of the University of St. Andrews and his colleagues report on the discovery of a deep and unique eclipse on Roke 12.
The incident was seen in 2002 with two telescopes at the Spanish German Astronomical Center in Calar Alto, Almería Province, Spain. It was 0.6 mag deep and lasted approximately 1.3 hours. “The best explanation for the eclipse is the presence of a companion in an eccentric orbit,” the astronomers said.
They discovered that the substellar object orbits Roque 12 in less than 70 days. It is possibly a mass between 10 and 42 Jupiter masses, and therefore it can be a massive planet or a brown dwarf. Dr. Scholz and his co-authors stated.
The roke12 system may be one of the few known eclipse gates in the brown dwarf domain, previously with high eccentricity and long duration. Such a system would be especially suitable for testing evolutionary models for specific objects. “We help encourage the astronomical community to search for the second eclipse of Roke 12.”
The team’s work will be submitted for publication in the Open Journal of Astrophysics.
Discovered the oldest brown dwarf in the Milky Way. British astronomers reporting in the Journal of Monthly Information from the Royal Astronomical Society (arXiv.org) have found two of the oldest brown dwarfs in our galaxy. It is a brown dwarf from an artist.
Brown dwarfs are star-shaped objects, but much less massive, and do not generate internal heat through nuclear fusion like stars. This brown dwarf simply cools and fades over time, and very old brown dwarfs become very good.
Two new brown dwarfs, called WISE 0013 + 0634 and WISE 0833 + 0052, were identified in a survey conducted by NASA’s Wide Field Infrared Research Explorer. WISE 0013 + 0634 and WISE 0833 + 0052 are located in the constellations of Pisces and Hydra, respectively.
They move at speeds of 100-200 km per second, they are much faster than normal stars and other brown dwarfs, and are believed to have been 10 billion years ago when our galaxy was much smaller. Astronomers studied the infrared light emanating from these objects.
Which are unusual compared to typical slow brown dwarfs. The spectral signatures of its light reflect its ancient atmosphere, made almost entirely of hydrogen, with more abundant heavy elements found in young stars.
“Unlike other areas of life, the oldest members of the Galaxy move much faster than their younger population,” said author Dr. David Pinfield of the University of Hertfordshire. The stars near the Sun are made up of three overlapping populations: thin discs, thick discs, and haloes.
The thick disk is much older than the thin disk, and its stars move up and down at high speed. Both components of the disk are found within the aura that contains the remains of the galaxy’s first stars. Thin disk objects dominate the local disk, and thick disk and halo objects are much rarer.
About 97 percent of local stars are members of thin discs, while only 3 percent are thick disc or halo. Brown dwarf population figures probably follow those chains, suggesting that these fast-moving thick disk / halo objects are now only being discovered.
The thin disk of the Milky Way is believed to contain around 70 billion brown dwarfs, and the thick disks and halos occupy very large galactic volumes. Even a small local population represents a large number of ancient brown dwarfs in our galaxy.
“These two brown dwarfs can be the tip of an iceberg and are a difficult piece of astronomical archeology,” Dr. Pinfield concluded.