Gliese 581b or Gl 581b is an exoplanet orbiting within the Gliese 581 system. It is the first planet discovered of three confirmed in the system so far, and the second in order from the star.[4][5]
Gliese 581 b
Size comparison of Gliese 581 b with Neptune (Based on selected hypothetical modeled compositions)
The planet was discovered by a team of French and Swiss astronomers, who announced their findings on November 30, 2005, as a discovery of one of the smallest exoplanets then found, with one conclusion being that planets may be more common around the smallest stars. It was the fifth planet found around a red dwarf star (after Gliese 876's planets and Gliese 436 b).
The planet was discovered using the HARPS instrument, with which they found the host star to have a wobble that implied the existence of the planet.
Gliese 581b is at a minimum, approximately 15.8 times the Earth's mass, similar to Neptune's mass. It does not transit its star, implying that its inclination is less than 88.1 degrees.[6] It is rather close to Gliese 581 and completes a full orbit in only 5.4 days at a mean distance of about 6 million kilometers (0.041 AU). By comparison, Mercury is at a distance of 58 million kilometers (0.387 AU) and completes an orbit in 88 days.
Characteristicsedit
Gliese 581b is about 0.04 AU from its sun. It is likely close to Gliese 436 b in mass, temperature, and (with Gliese 876 d) susceptibility to solar effects such as coronal mass ejection. Gliese 581b does not transit. At the least, given that Gliese 581b orbits alongside two other planets (Gliese 581c and e) and that Gliese 436 b (thus far) stands alone, their formation must have differed.
^ abBonfils, Xavier; Forveille, Thierry; Delfosse, Xavier; Udry, Stéphane; Mayor, Michel; Perrier, Christian; Bouchy, François; Pepe, Francesco; Queloz, Didier; Bertaux, Jean-Loup (2005). "The HARPS search for southern extra-solar planets VI: A Neptune-mass planet around the nearby M dwarf Gl 581". Astronomy and Astrophysics. 443 (3): L15–L18. arXiv:astro-ph/0509211. Bibcode:2005A&A...443L..15B. doi:10.1051/0004-6361:200500193. S2CID 59569803.
^ abTrifonov, T.; Kürster, M.; et al. (February 2018). "The CARMENES search for exoplanets around M dwarfs. First visual-channel radial-velocity measurements and orbital parameter updates of seven M-dwarf planetary systems". Astronomy & Astrophysics. 609: A117. arXiv:1710.01595. Bibcode:2018A&A...609A.117T. doi:10.1051/0004-6361/201731442.
^Robertson, Paul; Mahadevan, Suvrath; Endl, Michael; Roy, Arpita (3 July 2014). "Stellar activity masquerading as planets in the habitable zone of the M dwarf Gliese 581". Science. 345 (6195): 440–444. arXiv:1407.1049. Bibcode:2014Sci...345..440R. doi:10.1126/science.1253253. PMID 24993348. S2CID 206556796.
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SolStation: Gliese 581 / HO Librae
January 01, 1970
gliese, 581b, 581b, exoplanet, orbiting, within, gliese, system, first, planet, discovered, three, confirmed, system, second, order, from, star, gliese, bsize, comparison, gliese, with, neptune, based, selected, hypothetical, modeled, compositions, discovery, . Gliese 581b or Gl 581b is an exoplanet orbiting within the Gliese 581 system It is the first planet discovered of three confirmed in the system so far and the second in order from the star 4 5 Gliese 581 bSize comparison of Gliese 581 b with Neptune Based on selected hypothetical modeled compositions Discovery 1 Discovered byX Bonfils T Forveille X Delfosse S Udry M Mayor C Perrier F Bouchy F Pepe D Queloz J L BertauxDiscovery dateAugust 22 2005announced November 30 2005Detection methodDoppler SpectroscopyOrbital characteristics 2 Semi major axis0 041 0 001 AUEccentricity0 022 0 027 0 005Orbital period sidereal 5 368 0 001 dTime of periastron2454751 76 0 01 3 Argument of periastron118 3 27 4 22 9 Semi amplitude12 35 0 18 0 20 m sStarGliese 581Physical characteristics 2 Mass 15 20 0 22 0 27 M Contents 1 Discovery 2 Orbit and mass 3 Characteristics 4 See also 5 References 6 External linksDiscovery editThe planet was discovered by a team of French and Swiss astronomers who announced their findings on November 30 2005 as a discovery of one of the smallest exoplanets then found with one conclusion being that planets may be more common around the smallest stars It was the fifth planet found around a red dwarf star after Gliese 876 s planets and Gliese 436 b The planet was discovered using the HARPS instrument with which they found the host star to have a wobble that implied the existence of the planet The astronomers published their results in Astronomy and Astrophysics Letters 1 Orbit and mass editGliese 581b is at a minimum approximately 15 8 times the Earth s mass similar to Neptune s mass It does not transit its star implying that its inclination is less than 88 1 degrees 6 It is rather close to Gliese 581 and completes a full orbit in only 5 4 days at a mean distance of about 6 million kilometers 0 041 AU By comparison Mercury is at a distance of 58 million kilometers 0 387 AU and completes an orbit in 88 days Characteristics editGliese 581b is about 0 04 AU from its sun It is likely close to Gliese 436 b in mass temperature and with Gliese 876 d susceptibility to solar effects such as coronal mass ejection Gliese 581b does not transit At the least given that Gliese 581b orbits alongside two other planets Gliese 581c and e and that Gliese 436 b thus far stands alone their formation must have differed See also editHabitability of red dwarf systemsReferences edit a b Bonfils Xavier Forveille Thierry Delfosse Xavier Udry Stephane Mayor Michel Perrier Christian Bouchy Francois Pepe Francesco Queloz Didier Bertaux Jean Loup 2005 The HARPS search for southern extra solar planets VI A Neptune mass planet around the nearby M dwarf Gl 581 Astronomy and Astrophysics 443 3 L15 L18 arXiv astro ph 0509211 Bibcode 2005A amp A 443L 15B doi 10 1051 0004 6361 200500193 S2CID 59569803 a b Trifonov T Kurster M et al February 2018 The CARMENES search for exoplanets around M dwarfs First visual channel radial velocity measurements and orbital parameter updates of seven M dwarf planetary systems Astronomy amp Astrophysics 609 A117 arXiv 1710 01595 Bibcode 2018A amp A 609A 117T doi 10 1051 0004 6361 201731442 Robertson Paul Mahadevan Suvrath Endl Michael Roy Arpita 3 July 2014 Stellar activity masquerading as planets in the habitable zone of the M dwarf Gliese 581 Science 345 6195 440 444 arXiv 1407 1049 Bibcode 2014Sci 345 440R doi 10 1126 science 1253253 PMID 24993348 S2CID 206556796 Gl 581 b Extrasolar Planets Encyclopaedia Archived from the original on 2014 02 10 If There s Life on Alien Planet Gliese 581g How Do We Find It Space com 30 September 2010 M Lopez Morales et al 2006 Limits to Transits of the Neptune mass planet orbiting Gl 581 Publications of the Astronomical Society of the Pacific 118 849 1506 1509 arXiv astro ph 0609255 Bibcode 2006PASP 118 1506L doi 10 1086 508904 S2CID 15156619 External links edit nbsp Wikimedia Commons has media related to Gliese 581 b ESO The Dwarf that Carries a World SolStation Gliese 581 HO Librae Retrieved from https en wikipedia org w index php title Gliese 581b amp oldid 1191198026, wikipedia, wiki, book, books, library,
