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HAT-P-11b (or Kepler-3b) is an extrasolar planet orbiting the star HAT-P-11. This planet was discovered by the transit method and submitted for publication on January 2, 2009.
This planet is located approximately 122 light-years (37 pc) away in the constellation of Cygnus, orbiting the 10th magnitude K-type star HAT-P-11. This planet was the smallest transiting planet known when first discovered, with a radius about 5 times that of Earth; but is more massive than Gliese 436 b at a true mass of 26 times that of Earth. This planet orbits about the same distance from the star as 51 Pegasi b is from 51 Pegasi, typical of transiting planets. However, the orbit of this planet is eccentric, at around 0.198, unusually high for hot Neptunes. HAT-P-11b's orbit is also highly inclined, with a tilt of approximately 103 degrees relative to its star's rotation.
The HAT-P-11 system was within the field of view of the Kepler spacecraft.
Its radial velocity is drifting and this may be a result of an as-yet-undiscovered planet in the system.
The planet fits models for 90% heavy elements. Expected temperature is 878 ± 15K. Actual temperature must await calculations of secondary transit.
HAT-P-11b is the first Neptune-sized exoplanet to have relatively cloud-free atmosphere.
See also
References
- van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
- "Inclined Orbits Prevail in Exoplanetary Systems". January 12, 2011.
- Roberto Sanchis-Ojeda, Josh N. Winn, Daniel C. Fabrycky (2012). "Starspots and spin-orbit alignment for Kepler cool host stars". arXiv:1211.2002. Bibcode:2013AN....334..180S. doi:10.1002/asna.201211765.
{{cite journal}}: Cite journal requires|journal=(help)CS1 maint: multiple names: authors list (link) - ^ Bakos, G. Á.; et al. (2010). "HAT-P-11b: A Super-Neptune Planet Transiting a Bright K Star in the Kepler Field". The Astrophysical Journal. 710 (2): 1724–1745. arXiv:0901.0282. Bibcode:2010ApJ...710.1724B. doi:10.1088/0004-637X/710/2/1724.
- http://www.nasa.gov/press/2014/september/nasa-telescopes-find-clear-skies-and-water-vapor-on-exoplanet/index.html#.VCNZelGCEc0
External links
Media related to HAT-P-11b at Wikimedia Commons
- "HAT-P-11 b". Exoplanets.