CHADNEY J., GALAND M., UNRUH Y., KOSKINEN T. & SANZ-FORCADA J. 2016 2007 & Astrophys., 367, 521 [27]:{{{3}}}[30]:{{{3}}}, Epsilon Eridani's Bayer designation was established in 1603 as part of the Uranometria, a star catalogue produced by German celestial cartographer Johann Bayer. But clearly, this could be the most astonishing journey in the history of humanity. CAMPBELL B., WALKER G. & YANG S. [52] Two years later, the presence of an excess infrared emission close to Epsilon Eridani was announced, which indicated a disk of fine-grained cosmic dust was orbiting Epsilon Eridani. The clumps in the dust occur at orbits that have an integer resonance with the orbit of the suspected planet. One) Subsurface oceans beneath a thick shell of ice. Astron. paper, Epsilon Eridani's Planetary Companion and Circumstellar Dust. & Astrophys. arxiv Revisiting the atmosphere of the exoplanet 51 Eridani b with VLT/SPHERE 2022 BROWN-SAVILLA S., MAIRE A.-L., MOLLIERE P., SAMLAND M., FELDT M. et al. Not surprisingly, Project Ozma was unsuccessful. $$ I'm saying it might work for you either way if you chose it. JENNESS T., MORIARTY-SCHIEVEN G., DAVIS G., BUTNER H., GEAR W., DOMINIK C. & [85] Epsilon Eridani's hot corona results in a mass loss rate from Epsilon Eridani's stellar wind that is 30 times higher than the Sun's. arxiv, Constraining the Orbit and Mass of Eridani b with Radial Velocities, Hipparcos IAD-{Gaia~DR2} Astrometry, and Multi-epoch Vortex Coronagraphy Upper Limits Let me know if I got anything wrong! The systems were observed at the emission frequency of neutral hydrogen, 1,420MHz. MNRAS, 408, 1667 MNRAS, 403, 1368 Epsilon Eridani ( Eri, Eridani), or Ran, is a star in the southern constellation Eridanus, along a declination 9.46 south of the celestial equator. 2006 paper We know their distance, size, temperature, and if they are multiple systems or single stars, for example; but ultimately what we would really like to add to this 3D map of the galaxy are the planets in orbit around these stars. 1990 ApJ., 649, 1010 paper arxiv Evidence for a planetary system was discovered in 1998 by the observation of asymmetries in this dust ring. [107][108] The process involved public nomination and voting for the new names. Fifteen days of observation showed no anomalous radio signals coming from Epsilon Eridani. 2019 [57], In 1960, American physicist Philip Morrison and Italian physicist Giuseppe Cocconi proposed that extraterrestrial civilizations might be using radio signals for communication. Preserving backwards compatibility when adding new keywords. Description []. paper, Predicting low-frequency radio fluxes of known extrasolar planets paper, epsilon ERIDANI, upsilon ANDROMEDAE, 51 PEGASI, HD 209458, HD 196050. These 21 stars are: , , , b, , , c, , , (two stars), d, A, , , , , , , , . BENEDICT F., McARTHUR E., HATZES A., NELAN E., COCHRAN W., GATEWOOD G., 2006 f=\frac{L}{4\pi d^{2}} preprint, Abundance Stratification of Exoplanet Host Stars We find that a $2 R_{Io}$ THEM orbiting $\epsilon$ Eridani b with an eccentricity of 0.02, would need to have a semi-major axis of 4 planetary Roche-radii for 100% of the simulations to produce an observable moon. [23], Epsilon Eridani's designation was established in 1603 by Johann Bayer. And it has given us a new world to explore, and one that is not too far away. paper arxiv, The habitability of stagnant-lid Earths around dwarf stars [69] The apparent magnitude of 3.73 can make it difficult to observe from an urban area with the unaided eye, because the night skies over cities are obscured by light pollution. Nice. . Heres why. Internal heat generated by tidal flexing from the interaction with the orbits of other moons, and perhaps a slightly eccentric orbit might produce sufficient equivalent-to-tectonic stresses within the crust, could enable liquid water to exist. & Astrophys., accepted Stellar winds and inner astrospheres If the belt has existed for longer than this period, which appears likely, it imposes an upper limit on Epsilon Eridanib's eccentricity of about 0.100.15. Comparison of different abundance indicators & Astrophys., 657, A7 [75] The overall magnetic activity of Epsilon Eridani is irregular, but it may vary with a 4.9-year period. Res. preprint, Does life exist on this exoplanet? [39]:{{{3}}} In 1847, an edition of Lalande's catalogue (Francis Baily et al.) Tau Eridani. paper preprint, Transit of Luyten 726-8 within 1 ly from Epsilon Eridani [91], Epsilon Eridani made its closest approach to the Sun about 105,000years ago, when they were separated by 7ly (2.1 parsecs). Unfortunately, the exoplanets discovered by Kepler are very distanttoo far away for us to observe (and thereby study) using techniques available to most scientists today. Because of its moderate brightness, Ran should be easily visible from locations with dark skyes, while . Your role in space exploration starts now. 2007 paper arxiv, Tidally Heated Exomoons around Eridani b: Observability and prospects for characterization ApJ. and is home to at least one habitable world, Epsilon Eridani IV, which as of 3145 was located in the Republic of the Sphere. Coordinates: 03 h 32 m 55.8442 s, 09 27 29.744 Epsilon Eridani ( Latinized from Eridani ), proper name Ran, [19] is a star in the southern constellation of Eridanus. abstract, Giant Metrewave Radio Telescope low-frequency observations of extrasolar planetary systems paper, Numerical Modelling of Dusty Debris Disks. The magnitude, assigned to Epsilon Eridani by Ptolemy, was 3. paper, Estimation of the XUV radiation onto close planets and their evaporation 2010 McCARTHY Ch., WEBB R., H.M. BUTNER H., GEAR W. & WALKER H. 2007 & Astrophys., 414, L9 Account Center Contact Us Privacy Policy. SCHTZ O., NIELBOCK M., WOLF S., HENNING Th. Astron. arxiv 2011 [32] In addition to the letter , Bayer had given it the number 13 (the same as Ptolemy's catalogue number, as were many of Bayer's numbers) and designation "Decima septima", which means in Latin "The seventeenth". Only the component of the displacement along the line of sight to Earth is known, which yields a value for the formula msini, where m is the mass of the planet and i is the orbital inclination. BROWN R. ApJ. At 10.5 light-years from its sister system, the Sol . [98], The clumpy structure of the dust belt may be explained by gravitational perturbation from a planet, dubbed Epsilon Eridani b. One problem: I asked for surface oceans, because I want any life that develops to become a spacefaring species. [36]:{{{3}}}[37]:{{{3}}}[38]:{{{3}}}, In 1801 Epsilon Eridani was included in Histoire Cleste Franaise, Joseph Jrme Lefranois de Lalande's catalogue of about 50,000 stars, based on his observations during 17911800, in which observations are arranged in a time order. Astron. So on to my next question, which I've posted separately, $$ ALVARADO-GOMEZ, J., HUSSAIN, G., COHEN, O., DRAKE, J., GAARRAFFO, C. & 2 additional authors 2011 From these observations, a parallax of 0.14 0.02 arcseconds was calculated. 2011 A player falls asleep during the game and his friend wakes him -- illegal? paper arxiv, Possible detection of gamma rays from Epsilon Eridani [115] However, the presence of a large planet with a highly elliptical orbit in proximity to Epsilon Eridani's habitable zone reduces the likelihood of a terrestrial planet having a stable orbit within the habitable zone. 2010 Only to the north of latitude 80N is it permanently hidden below the horizon. 2022 WISE A., DODSON-ROBINSON S., BENEVOUR K. & PROVINI A. [101][102] If the dust disk is instead being generated from the outer debris disk, rather than from collisions in an asteroid belt, then no constraints on the planet's orbital eccentricity are needed to explain the dust distribution. TAKEDA Y., SATO B., KAMBE E., AOKI W., HONDA S., KAWANOMOTO S., MASUDA S., Exoplanet Archive. MARENGO M., MEGEATH S., FAZIO G.,STAPELFELDT K., WERNER M. & BACKMAN D. 2006 Astrophys., 46, 339 [45] This movement implied it was relatively close to the Sun,[46] making it a star of interest for the purpose of trigonometric parallax measurements. [39]:{{{3}}}[40]:{{{3}}} Also in 1801 it was included in the catalogue of Johann Bode, in which about 17,000 stars were grouped into 102 constellations and numbered (Epsilon Eridani got the number 159 in the constellation Eridanus). X. Lithium Abundances and vsini Revisited [112] The proximity, Sun-like properties and suspected planets of Epsilon Eridani have also made it the subject of multiple studies on whether an interstellar probe can be sent to Epsilon Eridani. Notes AAS. Located at a distance 10.5 light-years from the Sun, it has an apparent magnitude of 3.73, making it the third-closest individual star visible to the naked eye. 2009 This planetary system is different from ours. Let me close by saying that it is astonishing that we were able to detect this small planet after only three months of observations. paper arxiv ADS, Constraints on Planetesimal Collision Models in Debris Disks [19] Current data indicate that this planet orbits with a period of about 7 years at a mean separation of 3.4 astronomical units (AU), where 1AU is the mean distance between Earth and the Sun. 2009 Could this moon of a gas giant orbiting a neutron star support life? Astron. 2004 Proxima Centauri is only 4.25 light-years away, so its in our cosmic backyard. [8], American astrophysicist Alice C. Quillen and her student Stephen Thorndike performed computer simulations of the structure of the dust disk around Epsilon Eridani. Team 2004 ApJ., 700, 1647 & Astrophys., 675, A57 The second planet orbiting near the rim of the outer asteroid belt at 20 astronomical units was inferred when Spitzer discovered the belt. Epsilon Eridani is a fourth magnitude (on the bright side, 3.73) class K (K2) ordinary, though relatively young, hydrogen-fusing dwarf. Epsilon Eridani was settled during the early years of the Terran Alliance, with the first colony on Epsilon Eridani IV being established by Alana Korvin . & Astrophys., 449, 805 & Astrophys., 522, A13 [53] This debris disk has since been extensively studied. paper, Constraints on Long-Period Planets from an L' and M band Survey of Nearby Sun-Like Stars: Modeling Results & Astrophys., 587, A87 HEINZE A., HINZ Ph., KENWORTHY M., MILLER D. & SIVANDANDAN S. About 1.5more massive than Jupiter, theplanet takes 7-years to circle its star,Epsilon Eridani. REINERS A. binary star. [101] The second, denser belt, most likely also populated by asteroids, lies between the first belt and the outer comet disk. 2015 KLEISIOTI E., DIRKS D., ROVIRA-NAVARRO M. & KENWORTHY M. 2016 Epsilon Eridani , formally named Ran, is a star in the southern constellation of Eridanus, at a declination of 9.46 south of the celestial equator. 2007 ERTEL S., WOLF S. & RODMANN J. ADS, A Combined Spectroscopic and Photometric Stellar Activity Study of Epsilon Eridani Worldbuilding Stack Exchange is a question and answer site for writers/artists using science, geography and culture to construct imaginary worlds and settings. It may be a member of the Ursa Major Moving Group of stars that share a similar motion through the Milky Way, implying these stars shared a common origin in an open cluster. Taking an example from the moons of Jupiter, Europa in particular, the possibility of a sub-surface ocean might be explored. Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood. paper, The Extrasolar Planet eps Eridani b - Orbit and Mass 2010 2019 & HINDS P. J., accepted But Kepler is not our only tool for finding exoplanets. WALKER G. Epsilon Eridani B has Mass of roughly 0.63 that of Jupiter (and is therefore not a brown dwarf star due to lack of mass), and a temperature of ~150 K (123 C; 190 F). Why no-one appears to be using personal shields during the ambush scene between Fremen and the Sardaukar? Empowering the world's citizens to advance space science and exploration. 2011 Astron. The catalogue was included as the 7th (northern sky) and 8th (southern sky) books of his 13-book astronomical treatise (Mathmatik Syntaxis), known by its later Arabic name Almagest. Epsilon Eridani b, also known as AEgir [sic],[5][nb 1] is an exoplanet approximately 10.5 light-years away orbiting the star Epsilon Eridani, in the constellation of Eridanus . L is the luminosity of Epsilon Eridani, which is 0.34 times that of the sun. 2004 Ultimately, this discovery is a significant step on the road to mapping our galaxy. to design and build instruments to image and characterize this planet. LANZA A. New Astronomy paper, On the Ages of Exoplanet Host Stars Epsilon Eridani appears in science fiction stories and has been suggested as a destination for interstellar travel. SANZ-FORCADA J., RIBAS I., MICELA G., POLLOCK A., GARCIA-ALVAREZ D., SOLANO E. & EIROA C. MANDELL A., RAYMOND S. & SIGURDSSON S. Astron. & Astrophys., 499, L13 BAAS, 36, #62.03 2010 abstract, Epsilon Eridani's Planetary Debris Disk: Structure and Dynamics based on Spitzer and CSO Observations paper arxiv, Density Estimation for Projected Exoplanet Quantities March 27, 2023 This is similar to the estimated 10 Earth masses in the primordial Kuiper belt. @isdi0, Well, the problem is: they have no motivation to drill through the ice! With a declination of 9.46, Epsilon Eridani can be viewed from much of Earth's surface. stated in. Astrobiology, 12, 361 paper arxiv, Signatures of Star-planet interactions My fragile tender eyes are offended by your long decimal expansions. This allows it to be viewed from most of Earth's surface. Values for its orbital period range from 6.85 to 7.2 years. 7985 It was, until today, the closest exoplanet known. ECUVILLON A., ISRAELIAN G., SANTOS N., SHCHUKINA N., MAYOR M. & REBOLO R. 1 reference. . abstract, Catalogue of Stellar Diameters and Absolute Radii of Stars (CADARS) - Third edition -Comments and statistics From Epsilon Eridani, the Sun would appear on the diametrically opposite side of the sky at the coordinates RA=15. abstract, The Dynamical Influence of a Planet at Semimajor Axis 3.4 AU WRIGHT J., FAKHOURI O., MARCY G., HAN E., FENG Y., JOHNSON A., HOWARD A., VALENTI J., ANDERSON J. Astron. BAAS, 36, #41.02 astrophysical X-ray source. 2005 BEICHMAN C., SU K., STANSBERRY J., RIEKE G. & HINES D. paper The latter is an analog of the zodiacal dust that occupies the plane of the Solar System. [77][note 2] The axial tilt of Epsilon Eridani toward the line of sight from Earth is uncertain. The second planet orbiting near the rim of the outer asteroid belt at 20 astronomical units was inferred when Spitzer discovered the belt. . BENEDICT F., McARTHUR B., GATEWOOD G., NELAN E., COCHRAN W., HETZES A., ENDL M., WITTENMYER R., BALIUNAS S., WALKER G., YANG S., KRSTER M., ELS S. & PAULSON D. Anyway, enough math, the final value (2.99815625542W/m2) is very small. PASJ, 53, 1211 2008 How can I shut off the water to my toilet? SHKOLNIK E. & LLAMA J. [47][48] By 1917, observers had refined their parallax estimate to 0.317arcseconds. 2021 This is too cold to have liquid water, and any moons of Epsilon Eridani B would have a similar temperature, and would therefore also not have surface oceans of liquid water. Definitely not enough to raise the moon's temperature above 0C (which is the freezing point of water no matter the pressure). [7] The space velocity components of Epsilon Eridani in the galactic coordinate system are (U, V, W) = (3, +7, 20) km/s, which means that it is traveling within the Milky Way at a mean galactocentric distance of 28.7kly (8.79kiloparsecs) from the core along an orbit that has an eccentricity of 0.09. The orbital radius where the UV flux matches that on the early Earth lies at just under 0.5AU. During the past million years, three stars are believed to have come within 7ly (2parsecs) of Epsilon Eridani. 1988 [63][64][113], The orbital radius at which the stellar flux from Epsilon Eridani matches the solar constantwhere the emission matches the Sun's output at the orbital distance of the Earthis 0.61 astronomical units (AU). 1373\left(0.00218365349994\right)=2.99815625542 2012 Planet-Harboring Stars. J., 157, 33 MORAN S., KUCHNER M. & HOLMAN M. BENEDICT F. Astronomers know that exoplanets, or planets in orbit around stars other than our own, are numerous in our galaxy. SAFFE C., GOMEZ M. & CHAVERO C. NASAs Kepler Space Telescope, which spent four years staring almost continuously at a tiny, distant patch of the sky, proved that there are on average two exoplanets per star in the Milky Way. [56] This discovery was supported by astrometric measurements of Epsilon Eridani made between 2001 and 2003 with the Hubble Space Telescope, which showed evidence for gravitational perturbation of Epsilon Eridani by a planet. ApJ, 857, 133 ROETTENBACHER R., CABOT S., FISCHER D., MONNIER J., HENRY G. et al. J. Brit. MacGREGOR M., WILNER D., ANDREWS S., LESTRADE J.-F. & MADDISON S. MADDISON S., GINO M., MUNRO A. A comprehensive study in 2008 called the detection "tentative" and described the proposed planet as "long suspected but still unconfirmed". & Astrophys., 541, A40 That could also be a source of heating for a moon, though it would also likely just make it even less habitable by creating constant lightning strikes and ionizing radiation. The star is . MARENGO M., STAPELFELDT K., WERNER M., HORA J., FAZIO G., SCHUSTER M., CARSON J. JONES B. POPPENHAEGER K., ROBRADE J. GRIEMEIER J.-M., ZARKA P. & SPREEUW H. At a distance of 10.5 light years (ly), it has an apparent magnitude of 3.73. Called Epsilon Eridani b, it orbits at an average distance of 3.4 astronomical unitsplacing it just outside the system's inner asteroid belt.
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