HD 40307 f explained

HD 40307 f
Discoverer:Mikko Tuomi et al.
Discovery Site:La Silla Observatory, Chile
Discovered:October 28, 2012
Apsis:astron
Semimajor:0.247 [0.233, 0.258] AU
Eccentricity:0.03 [0, 0.13]
Period:51.76 [51.30, 52.26] d
Semi-Amplitude:1.09 [0.77, 1.37]

HD 40307 f is an extrasolar planet 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 planet was confirmed in 2015.[5]

Planetary characteristics

This planet is the fifth planet from the star, at a distance of about 0.25 AU (compared to 0.39 AU for Mercury) with negligible eccentricity.

HD 40307 f's minimum mass is 5.2 that of Earth, and dynamical models suggest it cannot be much more (and so is measured close to edge-on).[1] Planets like this in that system have been presumed "super-Earth".[6]

Even though HD 40307 f is closer to the star than Mercury is to the Sun,[7] it gets (slightly) less insolation than Mercury gets because the parent star is dimmer than our home star.[8] It still gets more heat than Venus gets (like Gliese 581 c), and it has more gravitational potential than Venus has. HD 40307 f is more likely a super-Venus than a "super-Earth".[9]

Moreover, planets b, c, and d are presumed to have migrated in from outer orbits; and planet b is predicted a sub-Neptune.[10]

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. 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.
  7. Web site: Mercury Fact Sheet. NASA Goddard Space Flight Center . November 17, 2010 . 2012-11-10.
  8. Tuomi, Fig 17
  9. Tuomi, Fig 17 cites Fig 4 in 10.1051/0004-6361:20078091 . 2007A&A...476.1373S . Habitable planets around the star Gl 581? . . 476 . 3 . 2007 . 1373–1387 . Selsis . Franck . Kasting . James F. . Levrard . Benjamin . Paillet . Jimmy . Ribas . Ignasi . Delfosse . Xavier . 0710.5294 . 11492499 . Selsis ., "100% clouds" region
  10. 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 .

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "HD 40307 f".

Except where otherwise indicated, Everything.Explained.Today is © Copyright 2009-2024, A B Cryer, All Rights Reserved. Cookie policy.