ġ15 potential rogue planets in the region between Upper Scorpius and Ophiuchus (2021)Īstrophysicist Takahiro Sumi of Osaka University in Japan and colleagues, who form the Microlensing Observations in Astrophysics and the Optical Gravitational Lensing Experiment collaborations, published their study of microlensing in 2011. In October 2020, OGLE-201, an Earth-mass rogue planet, was discovered in the Milky Way. In December 2013, a candidate exomoon of a rogue planet ( MOA-2011-BLG-262) was announced. Spectroscopic observations of OTS 44 with the SINFONI spectrograph at the Very Large Telescope have revealed that the disk is actively accreting matter, similarly to the disks of young stars. Herschel far-infrared observations have shown that OTS 44 is surrounded by a disk of at least 10 Earth masses and thus could eventually form a mini planetary system.
Īstronomers have used the Herschel Space Observatory and the Very Large Telescope to observe a very young free-floating planetary-mass object, OTS 44, and demonstrate that the processes characterizing the canonical star-like mode of formation apply to isolated objects down to a few Jupiter masses. A possible example is Cha 110913-773444, which may have been ejected and become a rogue planet, or formed on its own to become a sub-brown dwarf.
Some planetary-mass objects may have formed in a similar way to stars, and the International Astronomical Union has proposed that such objects be called sub-brown dwarfs. The Milky Way alone may have billions to trillions of rogue planets, a range the upcoming Nancy Grace Roman Space Telescope will likely be able to narrow down. Such objects have been ejected from the planetary system in which they formed or have never been gravitationally bound to any star or brown dwarf. This video shows an artist's impression of the free-floating planet CFBDSIR J214947.2-040308.9.Ī rogue planet (also termed a free-floating planet (FFP), interstellar, nomad, orphan, sunless, starless, unbound or wandering planet) is an interstellar object of planetary-mass, therefore smaller than fusors ( stars and brown dwarfs) and without a host planetary system.
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