HD 40307 e explained

HD 40307 e
Discoverer:Mikko Tuomi et al.
Discovery Site:La Silla Observatory, Chile
Discovered:October 28, 2012
Apsis:astron
Semimajor:0.1886 [0.1782, 0.1969] AU
Eccentricity:0.06 [0, 0.18]
Period:34.62 [34.42, 34.83] d
Semi-Amplitude:0.84 [0.53, 1.16]
Star:HD 40307

HD 40307 e is an extrasolar planet candidate suspected to be orbiting the star HD 40307. It is located 42 light-years away in the direction of the southern constellation Pictor. The planet was discovered by the radial velocity method, using the European Southern Observatory's HARPS apparatus[1] [2] [3] by a team of astronomers led by Mikko Tuomi at the University of Hertfordshire and Guillem Anglada-Escude of the University of Göttingen, Germany.[4]

The existence of the planet was disputed in 2015, as more Doppler spectroscopy data has become available.[5]

Planetary characteristics

Its minimum mass is 3.5 that of Earth - the smallest - and dynamical models suggest it cannot be much more (and so is measured close to edge-on).[1] It further gets roughly the same insolation from its star as Mercury gets from the Sun.[6] Planets like this in that system have been presumed "super-Earth".[7]

However planets b, c, and d are presumed to have migrated in from outer orbits; and planet b is predicted a sub-Neptune.[8] It is likely that this planet formed even further out. Whether it is a sub-Neptune, a super-Venus or even a super-Mercury is unknown.

External links

Notes and References

  1. 10.1051/0004-6361/201220268 . Tuomi . Mikko . Anglada-Escudé . Guillem . Gerlach . Enrico . Jones . Hugh R. A. . Reiners . Ansgar . Rivera . Eugenio J. . Vogt . Steven S. . Butler . R. Paul . Habitable-zone super-Earth candidate in a six-planet system around the K2.5V star HD 40307 . Astronomy & Astrophysics . 17 December 2012 . 549 . A48 . 1211.1617 . 2013A&A...549A..48T . 7424216 .
  2. Web site: Wall . Mike . 'Super-Earth' Alien Planet May Be Habitable for Life . November 7, 2012 . . November 8, 2012 .
  3. Web site: Tate . Karl . Super-Earth Planet: Potentially Habitable Alien World Explained (Infographic) . November 7, 2012 . . November 8, 2012 .
  4. Web site: Murrin . Marc . Astronomers discover a potentially habitable Super-Earth HD 40307g (Infographic) . November 8, 2012 . . November 8, 2012 . https://web.archive.org/web/20121110203130/http://www.tech-stew.com/post/2012/11/08/Astronomers-discover-a-potentially-habitable-Super-Earth-HD40307g.aspx . November 10, 2012 . dead .
  5. The HARPS search for southern extra-solar planets. XXXVIII. Bayesian re-analysis of three systems. New super-Earths, unconfirmed signals, and magnetic cycles . Díaz . R. F. . Ségransan . D. . Udry . S. . Lovis . C. . Pepe . F. . Dumusque . X. . Marmier . M. . Alonso . R. . Benz . W. . Bouchy . F. . Coffinet . A. . Collier Cameron . A. . Deleuil . M. . Figueira . P. . Gillon . M. . Lo Curto . G. . Mayor . M. . Mordasini . C. . Motalebi . F. . Moutou . C. . Pollacco . D. . Pompei . E. . Queloz . D. . Santos . N. . Wyttenbach . A. . 1 . Astronomy and Astrophysics . 585 . A134 . 2016 . 1510.06446 . 2016A&A...585A.134D . 10.1051/0004-6361/201526729 . 118531921 .
  6. Tuomi, Fig. 17
  7. M. Mayor. S. Udry. C. Lovis. F. Pepe. D. Queloz. W. Benz. J.-L. Bertaux. F. Bouchy. C. Mordasini. D. Segransan. The HARPS search for southern extra-solar planets. XIII. A planetary system with 3 Super-Earths (4.2, 6.9, & 9.2 Earth masses). 0806.4587. 2009A&A...493..639M . 10.1051/0004-6361:200810451. 2009. Astronomy and Astrophysics. 493. 2. 639–644 . 116365802.
  8. 0901.1698. Barnes, R.. Jackson, B.. Raymond, S.. West, A.. Greenberg, R.. The HD 40307 Planetary System: Super-Earths or Mini-Neptunes?. The Astrophysical Journal. 2009. 10.1088/0004-637X/695/2/1006. 695. 2. 1006–1011. 2009ApJ...695.1006B. 18849636.

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