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Sub-brown Dwarf
A sub-brown dwarf or planetary-mass brown dwarf is an astronomical object that formed in the same manner as stars and brown dwarfs (i.e. through the collapse of a gas cloud) but that has a planetary mass, therefore by definition below the limiting mass for thermonuclear fusion of deuterium (about ). Some researchers call them free-floating planets whereas others call them planetary-mass brown dwarfs. They are sometimes categorized as Y spectral class brown dwarfs. Description Sub-brown dwarfs are formed in the manner of stars, through the collapse of a gas cloud (perhaps with the help of photo-erosion) but there is no consensus amongst astronomers on whether the formation process should be taken into account when classifying an object as a planet. Free-floating sub-brown dwarfs can be observationally indistinguishable from rogue planets, which originally formed around a star and were ejected from orbit. Similarly, a sub-brown dwarf formed free-floating in a star cluster ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sol Cha-110913-773444 Jupiter
Sol or SOL may refer to: Astronomy * The Sun Currency * SOL Project, a currency project in France * French sol, or sou * Argentine sol * Bolivian sol, the currency of Bolivia from 1827 to 1864 * Peruvian sol, introduced in 1991 * Peruvian sol (1863–1985) *Solana (blockchain platform) (SOL), a cryptocurrency Entertainment, arts and media Music * G (musical note) or sol, a note of the solfege music scale * G major or sol, a musical key * Sol (band), a Canadian indie rock band active in the 1990s * ''Sol'' (album), an album by electronic musician Eskmo * ''Sol'', an album by Ougenweide * ''Shit Out of Luck'', a 1996 album by The Lillingtons Gaming * ''SOL'', or ''The Shadows of Luclin'', an expansion to ''Everquest'' computer game * Sol Badguy, a character in the ''Guilty Gear'' video games * ''Sol Squadron'', an enemy squadron in the video game Ace Combat 7: Skies Unknown Newspapers * ''Sol'' (newspaper), a weekly newspaper published in Portugal * ''soL'' (newspaper), a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gravity
In physics, gravity () is a fundamental interaction which causes mutual attraction between all things with mass or energy. Gravity is, by far, the weakest of the four fundamental interactions, approximately 1038 times weaker than the strong interaction, 1036 times weaker than the electromagnetic force and 1029 times weaker than the weak interaction. As a result, it has no significant influence at the level of subatomic particles. However, gravity is the most significant interaction between objects at the macroscopic scale, and it determines the motion of planets, stars, galaxies, and even light. On Earth, gravity gives weight to physical objects, and the Moon's gravity is responsible for sublunar tides in the oceans (the corresponding antipodal tide is caused by the inertia of the Earth and Moon orbiting one another). Gravity also has many important biological functions, helping to guide the growth of plants through the process of gravitropism and influencing the circ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
OTS 44
OTS 44 is a free-floating planetary-mass object or brown dwarf located at in the constellation Chamaeleon near the reflection nebula IC 2631. It is among the lowest-mass free-floating substellar objects, with approximately 11.5 times the mass of Jupiter, or approximately 1.1% that of the Sun. Its radius is not very well known and is estimated to be 23–57% that of the Sun. OTS 44 was discovered in 1998 by Oasa, Tamura, and Sugitani as a member of the star-forming region Chamaeleon I. Based upon infrared observations with the Spitzer Space Telescope and the Herschel Space Observatory, OTS 44 emits an excess of infrared radiation for an object of its type, suggesting it has a circumstellar disk of dust and particles of rock and ice. This disk has a mass of at least 10 Earth masses. Observations with the SINFONI spectrograph at the Very Large Telescope show that the disk is accreting matter at the rate of approximately 10−11 of the mass of the Sun per year. It could e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CFBDSIR 2149−0403
CFBDSIR 2149-0403 (full designation CFBDSIR J214947.2-040308.9) is a free-floating planetary-mass object or possibly a high- metallicity, low-mass brown dwarf in the constellation Aquarius. Originally, it was thought to be part of the AB Doradus moving group (ABDMG) as indicated by its position and proper motion, but the same team that discovered the object and conjectured its membership in the group has now rejected that hypothesis due to newer measurements. Without that membership, the age and mass of the object cannot be constrained. There is insufficient evidence to demonstrate that CFBDSIR 2149-0403 formed as a planet and was subsequently ejected. Discovery CFBDSIR 2149-0403 was discovered by the Canada-France Brown Dwarfs Survey, a near-infrared sky survey, and confirmed by WISE data. Philippe Delorme, of the Institute of Planetology and Astrophysics of Grenoble in France and his team, including researchers at Université de Montréal in Canada, detected CFBDSIR2149 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
S Ori 52
S, or s, is the nineteenth letter in the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ''ess'' (pronounced ), plural ''esses''. History Origin Northwest Semitic šîn represented a voiceless postalveolar fricative (as in 'ip'). It originated most likely as a pictogram of a tooth () and represented the phoneme via the acrophonic principle. Ancient Greek did not have a phoneme, so the derived Greek letter sigma () came to represent the voiceless alveolar sibilant . While the letter shape Σ continues Phoenician ''šîn'', its name ''sigma'' is taken from the letter '' samekh'', while the shape and position of ''samekh'' but name of ''šîn'' is continued in the '' xi''. Within Greek, the name of ''sigma'' was influenced by its association with the Greek word (earlier ) "to hiss". The original name of the letter "sigma" may have been ''san'', but due to the compli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WISE 0855–0714
WISE may refer to: Arts, entertainment, and media *WISE (AM), a radio station licensed to Asheville, North Carolina *WISE-FM, a radio station licensed to Wise, Virginia *WISE-TV, a television station licensed to Fort Wayne, Indiana Education *Web-based Inquiry Science Environment, a program hosted by Berkeley University *Wilberforce Institute for the study of Slavery and Emancipation, a research institute at University of Hull, England *Wind Science and Engineering Research Center (WiSE), at Texas Tech University *World Islamic Sciences and Education University, in Amman, Jordan Organisations and programmes *WISE Campaign, an initiative to encourage women into science and engineering *Work improvement in small enterprises, a programme for improvement of occupational health-and-safety conditions *World Information Service on Energy, an international anti-nuclear network based in Amsterdam *World Innovation Summit for Education, a global forum based in Doha, Qatar *World Institute o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2M1207b
2M1207b is a planetary-mass object orbiting the brown dwarf 2M1207, in the constellation Centaurus, approximately 170 light-years from Earth."The Distance to the 2M1207 System" , Eric Mamajek, November 8, 2007. Accessed on line June 15, 2008. It is one of the first candidate s to be directly observed (by imaging). It was discovered in April 2004 by the (VLT) at the |
2MASS J04414489+2301513
2MASS J04414489+2301513 (often abbreviated as 2M J044144) is a young star system hosting a planet and a couple of brown dwarfs, approximately 470 light years (145 parsecs) away. The 2MASS J04414489+2301513 primary (a brown dwarf) has a large separation (12.4 arcseconds) companion, 2MASS J04414565+2301580 (abbreviated as 2M J044145), which in turn has a nearby small separation substellar companion (separation of 0.23 arcseconds to the northeast). 2M J044145 has similar proper motion to 2M J044144 and is likely physically associated with the system. The entire system of 4 objects is then a hierarchical quadruple of two binary stars orbiting each other. The primary component has a spectral type of M4.5 and a red apparent magnitude of 14.2. Both components seem to be accreting mass from their stellar disks, as shown by their emission lines. The four stars have a total mass of only 26% of the Sun, making it the quadruple star system with the lowest mass known. Planetary system ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ROXs 42Bb
ROXs 42Bb is a directly imaged planetary-mass companion to the binary M star ROXs 42B, a likely member of the Rho Ophiuchi cloud complex. The companion was announced/discovered on October 17, 2013 by University of Toronto astronomer Thayne Currie. The object has an estimated mass around 9 Jupiter masses, depending on the age of the star, similar to the masses of directly imaged planets around HR 8799 and beta Pictoris. However, it is unclear whether ROXs 42Bb formed like these planets via core accretion, formed by disk (gravitational) instability, or formed more like a binary star. Preliminary fits of the spectra and broadband photometry to atmospheric models imply an effective temperature of about 2,000 K for a radius of or about 2150 K for a radius of . Like Beta Pictoris b, ROXs 42Bb's atmosphere is likely very cloudy and dusty. See also * List of largest exoplanets Below is a list of the largest exoplanets so far discovered, in terms of physical size, ordered by radi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HD 106906 B
HD 106906 b is a directly imaged planetary-mass companion and candidate exoplanet orbiting the star , in the constellation Crux at about from Earth. It is estimated to be about eleven times the mass of Jupiter and is located about 738 AU away from its host star. is rare in astronomy; while its mass estimate is nominally consistent with identifying it as an exoplanet, it appears at a much wider separation from its parent star than thought possible for in-situ formation from a protoplanetary disk. Description is the only known companion orbiting , a spectroscopic binary star composed of two F5V main-sequence stars with a combined mass of . Based on the star's luminosity and temperature, the system is estimated to be about . The system is a likely member of the Scorpius–Centaurus association. The star is surrounded by a debris disk oriented 21 degrees away from ; this disk is about from the binary on its interior and ranges asymmetrically from approximately from th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
