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[1] A spherical cloud of dust with a radius of 0.004 AU (600,000 km; 370,000 mi) can make Fomalhaut b visible. [63], The New Scientist magazine termed it the "Great Eye of Sauron", due to its shape and debris ring, when viewed from a distance, bearing similarity to the aforementioned "Eye" in the Peter Jackson Lord of the Rings films.[64]. The fluffy morphology of the grains suggests a cometary origin. it is not orbiting in the same plane as the disk), its orbit is not completely nested within the debris disk. Infrared non-detections suggest that Fomalhaut b cannot be more massive than 2 times Jupiter's mass but a lower limit on the mass depends on uncertain details for the nature of Fomalhaut b, its circumplanetary environment, and the existence of other planet-mass bodies in the system. Fomalhaut was the first stellar system with an extrasolar planet candidate (designated Fomalhaut b, later named Dagon) imaged at visible wavelengths. They also provided a new detection of Fomalhaut b at 0.4 µm. Observations in 2005 with Keck in theHband (1.5–1.8μm) and in 2008 with Gemini in L-prime (3.2–4μm) gave only upper limits. In addi-tion to this published planetary mass companion candidate (called Fomalhaut b), Fomalhaut … Estimated to be no more than three times Jupiter’s mass, the planet, called Fomalhaut b, orbits the bright southern star Fomalhaut, located 25 light-years away in the constellation Piscis Austrinus (the Southern Fish).” These conclusions are independent of Fom b’s photometry. Its mass is 2.6 Jupiters, it takes 1522 years to complete one orbit of its star, and is 160 AU from its star. [12] The name Dagon was proposed by Dr. Todd Vaccaro and forwarded by the St. While Fomalhaut is massive, with a mass of 1.9 times that of the Sun, its companion stars are smaller. [23] On its discovery, the planet was designated Fomalhaut b. [15] It is classified as a Vega-like star that emits excess infrared radiation, indicating it is surrounded by a circumstellar disk. [53], If there are additional planets from 4 to 10 AU, they must be under 20 MJ; if from 2.5 outward, then 30 MJ. Fomalhaut's Debris Disk and Planet: Constraining the Mass of Fomalhaut b From Disk Morphology 2009 CHIANG E., KITE E., KALAS P., GRAHAM J. The model is simple, adaptable to other debris disks, and can be extended to accommodate multiple planets. They modeled the optical detections and infrared upper limits for Fomalhaut b, showing that Fomalhaut b's emission can be completely explained by starlight scattered by small dust and arguing that this dust surrounds an unseen planetary-mass object. & CLAMPIN M. Most flare stars are red M-type dwarfs. Fomalhaut, a bright star 7.7 parsecs (25 light-years) from Earth, harbors a belt of cold dust with a structure consistent with gravitational sculpting by an orbiting planet. [4] Although the initial discovery paper for Fomalhaut b suggested that its optical brightness may be variable due to planetary accretion, later reanalyses of these data fail to find convincing evidence that Fomalhaut b is indeed variable,[4][16][2] thus eliminating evidence for planetary accretion. [17] Although LP 876-10 is itself catalogued as a binary star in the Washington Double Star Catalog (called "WSI 138"), there was no sign of a close-in stellar companion in the imaging, spectral, or astrometric data in the Mamajek et al. The F606W flux is variable; the flux in 2006 was about half of that in 2004. [9] Finally, in 2008, a spectroscopic measurement gave a significantly lower value of 46%. Fomalhaut b appears to be moving at about 4 kilometers per second. The existence of a massive planet orbiting Fomalhaut was first inferred from Hubble observations published in 2005 that resolved the structure of Fomalhaut's massive, cold debris disk (or dust belt/ring). [44] A planet's existence had been previously suspected from the sharp, elliptical inner edge of that disk. Cloud State University Planetarium of St. Fomalhaut has been a candidate for planet hunting ever since an excess of dust was discovered around the star in the early 1980s by NASA's Infrared Astronomy Satellite, IRAS. We use all available data to reveal that it has faded in brightness and grown in extent, with … In October 2013, Eric Mamajek and collaborators from the RECONS consortium announced that the previously known high-proper-motion star LP 876-10 had a distance, velocity, and color-magnitude position consistent with being another member of the Fomalhaut system. [1][4] However, it may be resolved at slightly longer wavelengths and in the most recently analyzed HST data, which would indicate that its emitting area is larger.[16][8]. The host star Fomalhaut has apparent magnitude of 1.2, with absolute magnitude of 1.7. [9][10] The process involved public nomination and voting for the new name. Estimated to be no more than three times Jupiter's mass, the planet, called Fomalhaut b, orbits the bright southern star Fomalhaut, located 25 light-years away in the constellation Piscis Austrinus (the Southern Fish). The orbital separation of Fomalhaut b is larger than that for directly imaged planets around β Pictoris and HR 8799(8–70 AU). Fomalhaut B has an estimated mass of 0.725 solar masses and a radius 63% that of the Sun. [7][8], The object was one of those selected by the International Astronomical Union as part of their public process for giving proper names to exoplanets. This was the first extrasolar orbiting object to be seen with visible light, captured by the Hubble Space Telescope. Fom b is detected inHST’s F814W (0.7–0.9μm) and F606W (0.45–0.7μm) passbands in 2006. The classical astronomer Ptolemy put it in Aquarius, as well as Piscis Austrinus. As of May 25, 2013 it is 110 AU from its parent star. Its estimated surface temperature is 4,711 K and its luminosity only 0.19 L ☉. The object was initially announced in 2008 and confirmed as real in 2012 from images taken with the Advanced Camera for Surveys (ACS) on the Hubble Space Telescope and, according to calculations reported in January 2013,[5][6] has a 1,700-year,[2] highly elliptical orbit. It was also a marker for the worship of Demeter in Eleusis. The nature and even the existence of a putative planet-mass companion (“Fomalhaut b”) to Fomalhaut has been debated since 2008. Another contentious issue has been the object's orbit. [19] The belt is not centered on the star, and has a sharper inner boundary than would normally be expected. Models of Fomalhaut b sculpting Fomalhaut's debris disk identify 0.5 times Jupiter's mass as a plausible … K. Auchettl,3 4 S.J. Assuming that Fomalhaut b's orbit is in the same plane as the debris disk located exterior to it, it orbits Fomalhaut at a distance of approximately 115 AU (1.72×1010 km; 1.07×1010 mi). Atacama Large Millimeter/submillimeter Array, List of star systems within 25–30 light-years, "VLTI near-IR interferometric observations of Vega-like stars. At 40°N, Fomalhaut rises above the horizon for eight hours and reaches only 20° above the horizon, while Capella, which rises at approximately the same time, will stay above the horizon for twenty hours. At a system age of ~ 200 Myr, detritus from the formation of the Fomalhaut planetary system still remains. [46] There are indications that the orbit is not apsidally aligned with the dust disk, which may indicate that additional planets may be responsible for the dust disk's structure. Cloud State University Planetarium to the IAU for consideration. The team attempted to detect Fomalhaut b in the infrared using the Subaru Telescope in Hawaii, but was unable to do so. 0.6 and 0.8 μm). Measurements of Fomalhaut's rotation indicate that the disk is located in the star's equatorial plane, as expected from theories of star and planet formation. However, subsequent studies from the Spitzer Space Telescope[18] and a reanalysis of the original HST data[16][4] The moving group has an estimated age of 200±100 million years and originated from the same location. NASA released the composite discovery photograph on November 13, 2008, coinciding with the publication of Kalas et al. The IR non detections limit Fomalhaut b’s mass to be less than about twice Jupiter’s mass. [15] If Fomalhaut b is instead one of two shepherding planets that together confine the debris disk into a narrow ring,[24] it could be anywhere between several times the mass of Mars to slightly more massive than Earth. [54], Fomalhaut forms a binary star with the K4-type star TW Piscis Austrini (TW PsA), which lies 0.28 parsecs (0.91 light-years) away from Fomalhaut, and its space velocity agrees with that of Fomalhaut within 0.1±0.5 km/s, consistent with being a bound companion. The NASA/ESA Hubble Space Telescope has taken the first visible light snapshot of a planet circling another star. The true nature of Fomalhaut b is the subject of significant debate. [20] A massive planet on a wide orbit but located interior to this debris ring could clear out parent bodies and dust in its vicinity, leaving the ring appearing to have a sharp inner edge and making it appear offset from the star. For the extrasolar planet, see. If Fom b is the dominant perturber of the belt, then to produce the observed disk morphology it must have a mass Mpl < 3MJ, an orbital semimajor axis apl> 101.5 AU, and an orbital eccentricity epl = 0.11–0.13. The revival of the claim that Fomalhaut b is (possibly) a planet after it had been discounted led some to nickname the object a "zombie planet",[28] although this is a non-technical term used in press material and does not appear in any peer-reviewed manuscript. The model is simple, adaptable to other debris disks, and can be extended to accommodate multiple planets. USS Fomalhaut (AK-22) was a United States navy amphibious cargo ship. Fomalhaut’s mass and radius are, respectively, a little more than twice and a little less than twice solar values. Neutron Star Hypothesis for Fomalhaut b 1 A Test of the Neutron Star Hypothesis for Fomalhaut b K. Poppenhaeger,1 ;2? [18] Furthermore, although the planet was thought to be a plausible explanation for Fomalhaut's eccentric debris ring, measurements in the Kalas et al. The innermost disk is unexplained as yet. Fomalhaut is also the setting for numerous works of fiction and games. ApJ., 693, 734 paper. Even though the elliptical path of Fomalhaut b appears to cross through the belt in the future, its orbital plane is likely 17 degrees different from the dust belt’s plane. [31] Dagon was a Semitic deity, often represented as half-man, half-fish. The WGSN's first bulletin of July 2016[27] included a table of the first two batches of names approved by the WGSN, which included the name Fomalhaut for this star. Fomalhaut b’s closest approach to the star (periastron) is approximately 30 au and the orbital period is roughly 1,700 years. Infrared non-detections suggest that Fomalhaut b cannot be more massive than 2 times Jupiter's mass[4][18] but a lower limit on the mass depends on uncertain details for the nature of Fomalhaut b, its circumplanetary environment, and the existence of other planetary-mass bodies in the system. [35] More recent work has found that purported members of the Castor Moving Group appear to not only have a wide range of ages, but their velocities are too different to have been possibly associated with one another in the distant past. Coordinates: 22h 57m 39.1s, −29° 37′ 20″, This article is about the star. It is a class A star on the main sequence approximately 25 light-years (7.7 pc) from the Sun as measured by the Hipparcos astrometry satellite. [14] Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified. [17] In December 2013, Kennedy et al. Fomalhaut b was initially identified as one of the first exoplanets to be directly imaged: its detection was attributed to reflected light from circumplanetary material (e.g. [30] Alternatively, if it is a transient dust cloud it must be extremely young,[4] perhaps having formed within the last few centuries. However, longer-term monitoring of Fomalhaut b may show evidence that the object is fading with time. The collision rate is estimated to be approximately 2000 kilometre-sized comets per day. The Fomalhaut system had been a target of exoplanet searches since 1993 in part because of its age — it’s relatively young at just 440 million years old — but especially because it radiates more infrared light than expected from the star alone. [24][25] These results invoked skepticism about Fomalhaut b's status as an extrasolar planet. On one hand, Fomalhaut b could be a planet less than twice Jupiter's mass that is either enshrouded in a spherical cloud of dust from ongoing planetesimal collisions[4][15] or surrounded by a large circumplanetary ring system,[1] either of which are responsible for scattering the primary star's light and thus making Fomalhaut b visible. Fomalhaut b ass eng Stëbswollek, déi 25 Liichtjoer vun eis ewech läit. [34], Fomalhaut is a young star, for many years thought to be only 100 to 300 million years old, with a potential lifespan of a billion years. 2M1207 b, GQ Lup b, DH Tau b, AB Pic b, CHXR 73 b, UScoCTIO 108 b, CT Cha b, 1RXS 1609 b) in that their emission was thought to originate at least in part from a planetary atmosphere. counterparts. instead suggest that Fomalhaut b's light is scattered starlight, not planet thermal emission. [58], Fomalhaut has had various names ascribed to it through time, and has been recognized by many cultures of the northern hemisphere, including the Arabs, Persians, and Chinese. [16], Fomalhaut b is orbiting its host star at a wide separation, where forming massive planets is difficult. [4], A second paper made public a day later and led by Raphael Galicher and Christian Marois at the Herzberg Institute of Astrophysics also independently recovered Fomalhaut b and confirmed the new 0.4 µm detection, claiming the spectral energy distribution (SED) of Fomalhaut b cannot be explained as due to direct or scattered radiation from a massive planet. Fomalhaut — often pronounced FO-MA-LO — is one of those bright stars that appears vivid in our skies due to its close proximity to our home planet. [1] The shape of its spectrum, as determined from measurements obtained at 0.4 to 0.8 μm, appears similar to that of its host star, suggesting that the emission identifying Fomalhaut b is completely due to scattered starlight. "[22] In the image, the bright outer oval band is the dust ring, while the features inside of this band represent noise from scattered starlight.[23]. The non-detections with Subaru and Spitzer imply that Fomalhaut b must have less than twice the mass of Jupiter. [16], The outermost disk is at a radial distance of 133 AU (1.99×1010 km; 1.24×1010 mi), in a toroidal shape with a very sharp inner edge, all inclined 24 degrees from edge-on. [49] In 2012, two independent studies confirmed that Fomalhaut b does exist, but it is shrouded by debris, so it may be a gravitationally-bound accumulation of rubble rather than a whole planet. It also bears the Flamsteed designation of 24 Piscis Austrini. Radius and age of α PsA, β Leo, β Pic, ɛ Eri and τ Cet", "High-resolution spectroscopy of Vega-like stars - I. Alternatively, it could be a conglomeration of rubble from a recent collision between comet-to-asteroid-sized bodies, and not actually a planet.[16][8]. At a declination of −29.6°, Fomalhaut is located south of the celestial equator, and hence is best viewed from the Southern Hemisphere. Fomalhaut can be located in northern latitudes by the fact that the western (right-hand) side of the Square of Pegasus points to it. In 1980, astronomer Jack Robinson proposed that the rising azimuth of Fomalhaut was marked by cairn placements at both the Bighorn and Moose Mountain Medicine Wheels in Wyoming, USA and Saskatchewan, Canada, respectively. Please update this article to reflect recent events or newly available information. Its discovery was publicly announced on 2008. [2] However, analysis of Fomalhaut b's astrometry showed that the object has a high eccentricity (e = 0.8), its orbit (projected on the sky) crosses the plane of Fomalhaut's debris ring, and thus it is unlikely to be the object sculpting the debris ring's sharp inner edge. Some astronomers now say it was a cloud of asteroid debris", "New HST data and modeling reveal a massive planetesimal collision around Fomalhaut", NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars, Final Results of NameExoWorlds Public Vote Released, Monthly Notices of the Royal Astronomical Society, "Images captured of 4 planets outside solar system", "First pictures taken of planet outside the solar system: Fomalhaut b", "ALMA Reveals Workings of Nearby Planetary System", "New doubts about 'poster child' of exoplanets", "New Study Brings a Doubted Exoplanet 'Back from the Dead, "Fomalhaut b: the first directly observed exoplanet", Hubblecast 22: Hubble directly observes planet orbiting Fomalhaut, NASA's Hubble reveals rogue planetary orbit for Fomalhaut b, https://en.wikipedia.org/w/index.php?title=Fomalhaut_b&oldid=987321158, Short description is different from Wikidata, Creative Commons Attribution-ShareAlike License, This page was last edited on 6 November 2020, at 08:02. It varies slightly in apparent magnitude, ranging from 6.44 to 6.49 over a 10.3 day period. When applied to the Fomalhaut ring, we consider a primordial origin scenario where H 2 dominates collisional excitation of CO, and a secondary origin scenario dominated by e and H 2O. LP 876-10 is located well within the tidal radius of the Fomalhaut system, which is 1.9 parsecs (6.2 light-years). [10][nb 1] A second 1997 study deduced a value of 78%, by assuming Fomalhaut has the same metallicity as the neighboring star TW Piscis Austrini, which has since been argued to be a physical companion. [7], Fomalhaut is slightly metal-deficient compared to the Sun, which means it is composed of a smaller percentage of elements other than hydrogen and helium. [39][40] The dust is distributed in a belt about 25 AU wide. [21], In May 2008, Paul Kalas, James Graham and their collaborators identified Fomalhaut b from Hubble/ACS images taken in 2004 and 2006 at visible wavelengths (i.e. [14], The nature of Fomalhaut b is unclear. It is around 440 million years old, or less than halfway through its one billion year lifespan, and has a surface temperature of around 8,500 kelvins compared to 5,778 K for the Sun . [22] Under the rules for naming objects in multiple star systems, the three components – Fomalhaut, TW Piscis Austrini and LP 876-10 – are designated A, B and C, respectively. [2], At the optical wavelengths at which Fomalhaut b is detected, it is only about 2.7×10−10 times as bright as the star and is the faintest (intrinsically) extrasolar object yet imaged. The current designation reflects modern consensus on Bayer's decision, that the star belongs in Piscis Austrinus. This visible-light image from the Hubble shows the newly discovered planet, Fomalhaut b, orbiting its parent star. In 2019 a team of researchers analyzing the astrometry, radial velocity measurements, and images of Fomalhaut B suggested the existence of a planet orbiting the star with a mass of 1.2+0.7−0.6 Jupiter Masses, and an poorly defined orbital period of up to 80 years. Following the optical imaging of exoplanet candidate Fomalhaut b (Fom b), we present a numerical model of how Fomalhaut's debris disk is gravitationally shaped by a single interior planet. [29] In December 2015, the IAU announced the winning name was Dagon for this planet. Fomalhaut by Kalas et al. The Fomalhaut system is all the more remarkable for offering a means independent of model spectra to get at Fom b's mass: the star is encircled by a belt of dust whose geometry is, in principle, sensitive to the mass and orbit of Fom b. Cloud, Minnesota, United States of America, to the IAU for consideration. [52], Observations of the star's outer dust ring by the Atacama Large Millimeter Array point to the existence of two planets in the system, neither one at the orbital radius proposed for the HST-discovered Fomalhaut b. Following Ptolemy, John Flamsteed in 1725 additionally denoted it 79 Aquarii. While it is unclear whether Fomal… At very small, Solar-System-like scales any additional companions must have a mass less than thirteen times the mass of Jupiter. Fomalhaut is a blue dwarf (A3V) star situated 25.13 light years from Earth that is 1.842 times bigger than the Sun, with 1.92 times its mass, and 16.63 times its luminosity. [28] The process involved public nomination and voting for the new names. Other members of this group include Castor and Vega. The mass of Fomalhaut b, if a planet, is highly uncertain. Fomalhaut b has subsequently been described as a low-mass planet whose surrounding dust cloud is entirely responsible for its detection or, most recently, debris from a collision of asteroids instead. [43], On November 13, 2008, astronomers announced an object, which they assumed to be an extrasolar planet, orbiting just inside the outer debris ring. [7] The surface temperature of the star is around 8,590 K (8,320 °C). LP 876-10 is a red dwarf of spectral type M4V, and located even further from Fomalhaut A than TW PsA—about 5.7° away from Fomalhaut A in the sky, in the neighbouring constellation Aquarius, whereas both Fomalhaut A and TW PsA are located in constellation Piscis Austrinus. Fomalhaut's dusty disk is believed to be protoplanetary,[42] and emits considerable infrared radiation. Although originally thought to be a massive exoplanet, the faintness of Fomalhaut b in the infrared and its failure to perturb Fomalhaut’s debris ring indicate a low mass. Models of Fomalhaut b sculpting the star's debris disk give a mass 0.5 times that of Jupiter. [33], Fomalhaut b's position in 2004 and 2006 (ACS), Artistic rendition of Fomalhaut b as a planet which revolves around its parent star, Visualisation of Fomalhaut and Fomalhaut b (artist's impression), Coordinates: 22h 57m 39.1s, −29° 37′ 20″, For the second star in the Fomalhaut system, see, Recovery, independent confirmation by Hubble and further additional findings, List of star systems within 25–30 light-years, "NASA's Hubble Reveals Rogue Planetary Orbit For Fomalhaut B", "Hubble Reveals Rogue Planetary Orbit for Fomalhaut b (News Release Number: STScI-2013-01)", "The Case of the Disappearing Exoplanet - Fomalhaut b was one of the first planets around another star to be directly imaged by telescopes. They considered two models to explain the SED: (1) a large circumplanetary disk around a massive, but unseen, planet and (2) the aftermath of a collision during the past 100 years of two Kuiper belt objects of radii about 50 km.[16]. [50][51], Herschel Space Observatory images of Fomalhaut reveal that a large amount of fluffy micrometer-sized dust is present in the outer dust belt. [21] Fomalhaut is the third-brightest star (as viewed from Earth) known to have a planetary system, after the Sun and Pollux. [29] The orbital separation of Fomalhaut b is larger than that for directly imaged planets around β Pictoris and HR 8799 (8–70 AU). At a mere 25 light-years away, Fomalhaut is among the Sun’s closest stellar neighbors. Abstract. Its current separation from Fomalhaut A is about 0.77 parsecs (2.5 light-years), and it is currently located 0.987 parsecs (3.22 light-years) away from TW PsA (Fomalhaut B). Fomalhaut b's high eccentricity may be evidence for a significant dynamical interaction with a hitherto unseen planet at a smaller orbital separation. But sensitive infrared Spitzer Space Telescope observations failed to detect Fomalhaut b, implying that Fomalhaut b has less than 1 Jupiter mass. [4] They reanalyzed the original Hubble data using new, more powerful algorithms for separating planet light from starlight and confirmed that Fomalhaut b does exist. Analyses of additional STIS data obtained in 2013 and 2014 argue that Fomalhaut b is fading and expanding in size, a behavior that may support the interpretation of Fomalhaut b as a collision between two asteroid-sized objects.[8]. It marked the solstice in 2500 BC. [16] Fomalhaut, K-type main-sequence star TW Piscis Austrini, and M-type, red dwarf star LP 876-10 constitute a triple system, even though the companions are separated by approximately 8 degrees.[17][18]. [17] Hence, "membership" to this dynamical group has no bearing on the age of the Fomalhaut system.[17]. This is an association of stars which share a common motion through space, and have been claimed to be physically associated. The designation TW Piscis Austrini is astronomical nomenclature for a variable star. Fomalhaut b, formally named Dagon (/ˈdeɪɡən/),[3] is a confirmed,[4] directly imaged[1] extrasolar object and candidate planet orbiting the A-type main-sequence star Fomalhaut, approximately 25 light-years away in the constellation of Piscis Austrinus. Because such dust is expected to be blown out of the system by stellar radiation pressure on short timescales, its presence indicates a constant replenishment by collisions of planetesimals.

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