GQ Lupi b
Size comparison of GQ Lupi b (at Neuhäuser et al. estimate) with Jupiter.
|Discovered by||Neuhäuser et al.|
|Discovery site||Paranal Observatory,|
|Discovery date||April 2005|
|3.0 ± 0.5, (4.6±1.4–6.5±2) RJ|
|Mass||1 – 36 MJ|
|Temperature||2650 ± 100, (2050±350–2400) K|
GQ Lupi b is a possible extrasolar planet or brown dwarf orbiting the star GQ Lupi. Its discovery was announced in April 2005. Along with 2M1207b, this was one of the first extrasolar planet candidates to be directly imaged. The image was made with the VLT telescope at Paranal Observatory, Chile on June 25, 2004.
GQ Lupi b has a spectral type between M6 and L0, corresponding to a temperature between 2,050 and 2,650 kelvins. Located at a projected distance of about 100 AU from its companion star, giving it an orbital period of perhaps about 1,200 years, it is believed to be several times more massive than Jupiter. Because the theoretical models which are used to predict planetary masses for objects in young star systems like GQ Lupi b are still tentative, the mass cannot be precisely specified — models place GQ Lupi b's mass anywhere between a few Jupiter masses and 36 Jupiter masses. At the highest end of this range, GQ Lupi b could be classified as a small brown dwarf, but at the lowest end of this range, it could rather be classified as an extremely large Jupiter-like exoplanet than a brown dwarf.
If classified as an exoplanet, with a maximum radius of 6.5 times that of Jupiter (RJ) (or 930,000 km in diameter), this would make GQ Lupi b one of largest exoplanets discovered, although the size of the planet is shrinking as it evolves.
- Astrometric and photometric monitoring of GQ Lupi and its sub-stellar companion, Ralph Neuhäuser, Markus Mugrauer, Andreas Seifahrt, Tobias Schmidt, and Nikolaus Vogt, Astronomy and Astrophysics 484, #1 (2008), pp. 281–291. doi:10.1051/0004-6361:20078493. Bibcode: 2008A&A...484..281N
- Zhou, Yifan; Herczeg, Gregory J; Kraus, Adam L; Metchev, Stanimir; Cruz, Kelle L (2014). "Accretion onto Planetary Mass Companions of Low-mass Young Stars". The Astrophysical Journal Letters. 783: L17. arXiv:1401.6545. Bibcode:2014ApJ...783L..17Z. doi:10.1088/2041-8205/783/1/L17.
- Planet : GQ Lup b, Extrasolar Planets Encyclopaedia. Accessed on line June 13, 2008
- Is this a Brown Dwarf or an Exoplanet? New Young Sub-stellar Companion Imaged with the VLT Archived 2008-05-07 at the Wayback Machine, ESO Press Release 09/05, April 7, 2005. Accessed on line June 13, 2008.
- Lists of Extrasolar Planets Archived 2013-10-29 at the Wayback Machine, IAU Working Group on Extrasolar Planets, August 28, 2006. Accessed on line June 13, 2008.
Media related to GQ Lupi b at Wikimedia Commons
- "GQ Lup b". Extrasolar Planets Encyclopaedia. Retrieved 2008-06-09.
- "V* GQ Lup". SIMBAD. Retrieved 2008-06-09.
- Young, Kelly (2005-04-04). "First image of exoplanet orbiting Sun-like star". New Scientist. Retrieved 2008-06-09.
- "Telescopes see 'distant planet'". BBC News. 2005-04-04. Retrieved 2008-06-09.
- Britt, Robert Roy (2005-04-30). "Fresh Debate over First Photo of Extrasolar Planet". SPACE.com. Retrieved 2008-06-09.