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HD 40307 b

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With a lower mass bound of 4.2 times the mass of the Earth, HD 40307 b is presumably too small to be a jovian planet. This concept was challenged in a 2009 study, which stated that if HD 40307 b is terrestrial, the planet would be highly unstable and would be affected by
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Tuomi, Mikko; Anglada-Escudé, Guillem; Gerlach, Enrico; Jones, Hugh R. A.; Reiners, Ansgar; Rivera, Eugenio J.; Vogt, Steven S.; Butler, R. Paul (17 December 2012). "Habitable-zone super-Earth candidate in a six-planet system around the K2.5V star HD 40307".
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The star around which HD 40307 b orbits has a low metallicity, compared to other planet-bearing stars. This supports a hypothesis concerning the possibility that the metallicity of stars during their births may determine whether a
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HD 40307 b is the second lightest planet discovered in the system, with at least 4.2 times the mass of the Earth. The planet orbits the star HD 40307 every 4.3 Earth days, corresponding of its location at approximately 0.047
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M. Mayor; S. Udry; C. Lovis; F. Pepe; D. Queloz; W. Benz; et al. (2009). "The HARPS search for southern extra-solar planets. XIII. A planetary system with 3 Super-Earths (4.2, 6.9, & 9.2 Earth masses)".
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from the star. The eccentricity of the planet's orbit was found to not differ significantly from zero, meaning that there is insufficient data to distinguish the orbit from an entirely circular one.
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The Arizonan astronomer Rory Barnes's mathematical model, in 2009, found that "Planet b’s orbit must be more than 15◦ from face-on"; however it cannot be much more.
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Barnes, R.; Jackson, B.; Raymond, S.; West, A.; Greenberg, R. (2009). "The HD 40307 Planetary System: Super-Earths or Mini-Neptunes?".
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Barnes, J.; O'Brien, D. (2002). "Stability of Satellites around Close-in Extrasolar Giant Planets".
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HD 40307 b does not transit and has not been imaged. More specific characteristics, such as its
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As with many other extrasolar planets, HD 40307 b was discovered by measuring variations in the
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apparatus, in June 2008. It is the second smallest of the planets orbiting the star, after
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in planets orbiting close to a star, it is unlikely that HD 40307 b hosts any satellites.
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between 16 and 18 June 2008. HD 40307 b was one of three found here at the time.
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HD 40307 b, c, and d are presumed to have migrated into their present orbits.
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Extrasolar Planets: XVI Canary Islands Winter School of Astrophysics
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Characterizing Extrasolar Planets, Timothy M. Brown, chapter 3,
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of the star it orbits. These measurements were made by the
212:. The planet is of interest as this star has relatively low 273:'s accretion disk forms gas giants or terrestrial planets. 216:, supporting a hypothesis that different metallicities in 1850:
Potential cultural impact of extraterrestrial contact
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away in the direction of the southern constellation
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The planet was discovered by the 1200:Habitability of binary star systems 1175:Catalog of Nearby Habitable Systems 526:"Trio of 'super-Earths' discovered" 1835:Nexus for Exoplanet System Science 1678:Hypothetical types of biochemistry 1205:Habitability of natural satellites 14: 1215:Habitability of red dwarf systems 524:Mayor; et al. (2008-06-16). 331:, a volcanic satellite of planet 1367:Life Investigation For Enceladus 590:Extrasolar Planets Encyclopaedia 554:Bryner, Jeanna (June 16, 2008). 287: 1357:Journey to Enceladus and Titan 1: 1914:Exoplanets discovered in 2008 1490:Berkeley SETI Research Center 1190:Extraterrestrial liquid water 585:"Notes for Planet HD 40307 b" 306:HD 40307 b. Artist impression 202:European Southern Observatory 1810:Extraterrestrials in fiction 1683:Interplanetary contamination 1180:Circumstellar habitable zone 1064:(unusual light fluctuations) 1056:(unusual light fluctuations) 1048:(unusual light fluctuations) 650:10.1088/0004-637X/695/2/1006 414:Astronomy & Astrophysics 236:(HARPS) spectrograph at the 1668:Extraterrestrial hypothesis 503:10.1051/0004-6361:200810451 444:10.1051/0004-6361/201220268 1935: 1382:Mars sample-return mission 473:Astronomy and Astrophysics 1135:Earliest known life forms 695:The Astrophysical Journal 619:The Astrophysical Journal 327:in a manner greater than 171: 129:Orbital period (sidereal) 1500:Breakthrough Initiatives 1604:extraterrestrial beings 1195:Galactic habitable zone 495:2009A&A...493..639M 436:2013A&A...549A..48T 80:Orbital characteristics 71:radial velocity, using 1752:Planetarium hypothesis 1742:Hart–Tipler conjecture 1727:Dark forest hypothesis 1717:Aestivation hypothesis 1436:Venus In Situ Explorer 1240:Planetary habitability 1029:(misidentified quasar) 1021:(misidentified pulsar) 319:cannot be determined. 1855:Post-detection policy 1757:Rare Earth hypothesis 1582:Voyager Golden Record 1475:Allen Telescope Array 1310:Enceladus Life Finder 1245:Superhabitable planet 938:Extraterrestrial life 1845:Planetary protection 1732:Firstborn hypothesis 1722:Berserker hypothesis 1693:Mediocrity principle 1510:Breakthrough Message 1128:Life in the Universe 566:on December 13, 2013 242:La Silla Observatory 46:La Silla Observatory 1658:Directed panspermia 1637:Reptilian humanoids 1505:Breakthrough Listen 1485:Arecibo Observatory 1431:Titan Mare Explorer 1004:Signals of interest 964:Murchison meteorite 952:Shergotty meteorite 718:2002ApJ...575.1087B 642:2009ApJ...695.1006B 56:Discovery date 41:Discovery site 21: 1780:Ancient astronauts 1377:Mars Geyser Hopper 1305:Enceladus Explorer 945:Events and objects 379:List of exoplanets 352:natural satellites 263:astronomical units 200:method, using the 184:orbiting the star 31:Discovered by 1883: 1882: 1413:SpaceX Red Dragon 1328:Rosalind Franklin 1123: 1122: 982:Allan Hills 84001 976:Allan Hills 77005 904: 903: 747:"Exoplanet Names" 182:extrasolar planet 175: 174: 1926: 1860:San Marino Scale 1800:Brookings Report 1747:Neocatastrophism 1653:Cosmic pluralism 1627:Little green men 1602:Types of alleged 1527:Astrolinguistics 1116: 1108: 1107:(unknown origin) 1104:Fast radio burst 1100: 1092: 1073: 1072:(unknown origin) 1069:HD 164595 signal 1065: 1057: 1049: 1030: 1022: 1008: 958:Nakhla meteorite 931: 924: 917: 908: 833: 826: 819: 810: 805: 803: 802: 793:. Archived from 782: 780: 779: 770:. Archived from 750: 744: 738: 737: 711: 709:astro-ph/0205035 702:(2): 1087–1093. 689: 683: 668: 662: 661: 635: 626:(2): 1006–1011. 613: 602: 601: 599: 598: 581: 575: 574: 572: 571: 562:. Archived from 551: 540: 539: 537: 536: 521: 515: 514: 488: 467: 456: 455: 429: 408: 298: 291: 157: 156: 146: 134:4.3115 ± 0.0006 122: 121: 101: 100: 66:Detection method 22: 1934: 1933: 1929: 1928: 1927: 1925: 1924: 1923: 1889: 1888: 1886: 1884: 1879: 1875:Xenoarchaeology 1865:Technosignature 1766: 1702: 1688:Kardashev scale 1641: 1603: 1596: 1592:Xenolinguistics 1557:Project Phoenix 1547:Project Cyclops 1532:Lincos language 1495:Bracewell probe 1480:Arecibo message 1461: 1454: 1352:Icebreaker Life 1254: 1166: 1159: 1119: 1114: 1106: 1098: 1090: 1076: 1071: 1063: 1055: 1047: 1033: 1028: 1020: 999: 940: 935: 905: 900: 859: 843: 837: 800: 798: 785: 777: 775: 762: 759: 754: 753: 745: 741: 691: 690: 686: 669: 665: 615: 614: 605: 596: 594: 583: 582: 578: 569: 567: 553: 552: 543: 534: 532: 523: 522: 518: 469: 468: 459: 410: 409: 392: 387: 375: 363: 309: 308: 307: 305: 300: 299: 292: 282: 280:Characteristics 258: 230:radial velocity 226: 198:radial velocity 155: 152: 151: 150: 142: 131: 120: 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Clipper 1312: 1307: 1302: 1295: 1288: 1280: 1275: 1270: 1264: 1262: 1260:Space missions 1256: 1255: 1253: 1252: 1247: 1242: 1237: 1232: 1227: 1222: 1217: 1212: 1207: 1202: 1197: 1192: 1187: 1182: 1177: 1171: 1169: 1161: 1160: 1158: 1157: 1152: 1147: 1142: 1137: 1131: 1129: 1125: 1124: 1121: 1120: 1118: 1117: 1115:(radio signal) 1109: 1101: 1099:(inconclusive) 1093: 1091:(radio source) 1084: 1082: 1078: 1077: 1075: 1074: 1066: 1058: 1053:EPIC 204278916 1050: 1041: 1039: 1035: 1034: 1032: 1031: 1023: 1014: 1012: 1005: 1001: 1000: 998: 997: 991: 985: 979: 973: 967: 961: 955: 948: 946: 942: 941: 936: 934: 933: 926: 919: 911: 902: 901: 899: 898: 893: 888: 883: 878: 873: 867: 865: 861: 860: 858: 857: 851: 849: 845: 844: 838: 836: 835: 828: 821: 813: 807: 806: 783: 758: 757:External links 755: 752: 751: 739: 726:10.1086/341477 684: 663: 603: 576: 541: 516: 479:(2): 639–644. 457: 389: 388: 386: 383: 382: 381: 374: 371: 362: 359: 302: 301: 293: 286: 285: 284: 283: 281: 278: 257: 256:Orbit and mass 254: 225: 222: 173: 172: 169: 168: 163: 159: 158: 153: 147: 144:Semi-amplitude 139: 138: 132: 127: 124: 123: 118: 112: 106: 105: 97: 91: 86: 83: 82: 76: 75: 69: 64: 61: 60: 57: 53: 52: 43: 37: 36: 33: 27: 26: 15: 13: 10: 9: 6: 4: 3: 2: 1931: 1920: 1917: 1915: 1912: 1910: 1907: 1905: 1902: 1900: 1897: 1896: 1894: 1887: 1876: 1873: 1871: 1868: 1866: 1863: 1861: 1858: 1856: 1853: 1851: 1848: 1846: 1843: 1841: 1838: 1836: 1833: 1831: 1828: 1826: 1823: 1821: 1818: 1816: 1813: 1811: 1808: 1806: 1803: 1801: 1798: 1796: 1793: 1791: 1788: 1786: 1783: 1781: 1778: 1777: 1775: 1773: 1769: 1763: 1760: 1758: 1755: 1753: 1750: 1748: 1745: 1743: 1740: 1738: 1735: 1733: 1730: 1728: 1725: 1723: 1720: 1718: 1715: 1714: 1712: 1709: 1708:Fermi paradox 1705: 1699: 1696: 1694: 1691: 1689: 1686: 1684: 1681: 1679: 1676: 1674: 1673:Fermi paradox 1671: 1669: 1666: 1664: 1661: 1659: 1656: 1654: 1651: 1650: 1648: 1644: 1638: 1635: 1633: 1632:Nordic aliens 1630: 1628: 1625: 1623: 1620: 1618: 1615: 1613: 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1198: 1196: 1193: 1191: 1188: 1186: 1183: 1181: 1178: 1176: 1173: 1172: 1170: 1168: 1162: 1156: 1155:Life on Titan 1153: 1151: 1148: 1146: 1145:Life on Venus 1143: 1141: 1138: 1136: 1133: 1132: 1130: 1126: 1113: 1110: 1105: 1102: 1097: 1094: 1089: 1086: 1085: 1083: 1079: 1070: 1067: 1062: 1059: 1054: 1051: 1046: 1043: 1042: 1040: 1036: 1027: 1024: 1019: 1016: 1015: 1013: 1011:Misidentified 1009: 1006: 1002: 995: 992: 989: 988:Yamato 000593 986: 983: 980: 977: 974: 971: 968: 965: 962: 959: 956: 953: 950: 949: 947: 943: 939: 932: 927: 925: 920: 918: 913: 912: 909: 897: 894: 892: 889: 887: 884: 882: 879: 877: 874: 872: 869: 868: 866: 862: 856: 853: 852: 850: 846: 841: 834: 829: 827: 822: 820: 815: 814: 811: 797:on 2012-03-04 796: 792: 788: 784: 774:on 2016-11-30 773: 769: 765: 761: 760: 756: 748: 743: 740: 735: 731: 727: 723: 719: 715: 710: 705: 701: 697: 696: 688: 685: 681: 680:0-521-86808-4 677: 673: 667: 664: 659: 655: 651: 647: 643: 639: 634: 629: 625: 621: 620: 612: 610: 608: 604: 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Index

Discovered by
Discovery site
La Silla Observatory
Chile
Detection method
HARPS
Orbital characteristics
Semi-major axis
AU
Eccentricity
Orbital period (sidereal)
d
Semi-amplitude
HD 40307
extrasolar planet
HD 40307
light-years
Pictor
radial velocity
European Southern Observatory
HARPS
HD 40307 e
metallicity
protostars
radial velocity
High Accuracy Radial Velocity Planet Searcher
Chile
La Silla Observatory
Nantes
France

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