GQ Lupi
{{short description|Star in the constellation of Lupus}}
{{Starbox begin
| name = GQ Lupi
}}
{{Starbox image
| image = 250px
| caption = A visual band light curve for GQ Lupi. The main plot (from ASAS data), shows the long-term variability, and the inset plot (adapted from Broeg et al.) shows the short-term periodic brightness variation.
}}
{{Starbox observe
| epoch = J2000.0
| constell = Lupus
| dec = {{DEC|−35|39|05.0540}}
| appmag_v = 11.40{{cite simbad|title=V* GQ Lup|accessdate=June 13, 2008}}
}}
{{Starbox character
| component1 = A
| u-b =
| variable = T Tauri variableAstrometric and photometric monitoring of GQ Lupi and its sub-stellar companion, Ralph Neuhaeuser, 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}}
| component2 = C (2MASS J15491331){{efn|name="GQ Lupi C"|Designated under 2MASS catalogue}}
| type2 = Red dwarf
| b-v2 =
| u-b2 =
| variable2 =
}}
{{Starbox astrometry
| radial_v =
| prop_mo_ra = {{val|−14.257|0.097}}
| prop_mo_dec = {{val|−23.596|0.066}}
| parallax = 6.5868
| p_error = 0.0473
| absmag_v = ~5From parallax and apparent magnitude.
}}
{{Starbox orbit
| primary = GQ Lupi A
| name = GQ Lupi C (2MASS J15491331){{efn|name="GQ Lupi C"}}
| period =
| axis_unitless = {{val|2430|ul=AU}}
| eccentricity =
| inclination =
| node =
| periastron =
| periarg =
}}
{{Starbox detail
| component1 = A
| metal =
| radius =
| rotation =
| luminosity =
| temperature =
| age2 =
| component2 = C (2MASS J15491331){{efn|name="GQ Lupi C"}}
| metal2 =
| rotation2 =
| luminosity2 =
| temperature2 = 3190
}}
{{Starbox catalog
| names = CD−35°10525, GQ Lup
}}
{{Starbox reference
| Simbad = V*+GQ+Lup
| ARICNS =
}}
{{Starbox end}}
GQ Lupi is a T Tauri variable star approximately 495 light-years away in the constellation of Lupus. The star is young and has about 70% of the Sun's mass.
Stellar system
In 2020, another low-mass companion of GQ Lupi was discovered at a separation distance of about 16 arcseconds, or 2400 AU. Designated 2MASS J15491331-3539118 under the 2MASS catalogue, it is likely a young stellar object that is gravitationally bound to its primary star. It is estimated to be approximately 15% the Sun's mass and 21% the Sun's radius. It has an effective temperature of about 3190 K, indicating that it is a red dwarf with the spectral type M4.{{cite journal|title=2MASS J15491331-3539118: a new low-mass wide companion of the GQ Lup system|url=https://www.researchgate.net/publication/339147825_2MASS_J15491331-3539118_a_new_low-mass_wide_companion_of_the_GQ_Lup_system|first=J. M.|last=Alcalá|journal=Astronomy & Astrophysics|display-authors=etal|arxiv=2001.10879|year=2020|volume=635|pages=L1|doi=10.1051/0004-6361/201937309|bibcode=2020A&A...635L...1A |s2cid=210942917}}
Possible planetary system
File:The Sub-Stellar Companion to GQ Lupi.jpg west. At the distance of GQ Lupi, this corresponds to a distance of roughly 100 AU. North is up and East is to the left.]]In 2005, Ralph Neuhäuser and his colleagues reported a substellar object, GQ Lupi b, orbiting the star. 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. Depending on its mass and the definition of a planet, GQ Lupi b may or may not be considered a planet.[http://www.eso.org/public/outreach/press-rel/pr-2005/pr-09-05.html Is this a Brown Dwarf or an Exoplanet? New Young Sub-stellar Companion Imaged with the VLT] {{webarchive|url=https://web.archive.org/web/20080507074340/http://www.eso.org/public/outreach/press-rel/pr-2005/pr-09-05.html |date=2008-05-07 }}, ESO Press Release 09/05, April 7, 2005. Accessed on line June 13, 2008. As of 2006, the International Astronomical Union Working Group on Extrasolar Planets described GQ Lupi b as a "possible planetary-mass companion to a young star".[http://www.dtm.ciw.edu/boss/planets.html Lists of Extrasolar Planets] {{webarchive|url=https://web.archive.org/web/20131029204807/http://www.dtm.ciw.edu/boss/planets.html |date=2013-10-29 }}, IAU Working Group on Extrasolar Planets, August 28, 2006. Accessed on line June 13, 2008. GQ Lupi b is listed as "confirmed planet" as in 2020.[http://www.openexoplanetcatalogue.com/planet/GQ%20Lup%20b/ openexoplanetcatalogue.com GQ Lup]
{{OrbitboxPlanet short
| exoplanet = b
| mass = 1–36[https://exoplanet.eu/catalog/gq_lup_b--238/ Planet : GQ Lup b], Extrasolar Planets Encyclopaedia. Accessed on line June 13, 2008
}}
Notes
{{Notelist}}
References
External links
- The low-mass companion of GQ Lup, E.W. Guenther, R. Neuhaeuser, G. Wuchterl, M. Mugrauer, A. Bedalov, and P.H. Hauschildt, Astronomische Nachrichten 326, #10 (December 2005), pp. 958–963. {{doi|10.1002/asna.200510461}}. {{Bibcode|2005AN....326..958G}}
- R. Neuhaeuser (2005). [https://arxiv.org/abs/astro-ph/0509906 "Homogeneous comparison of directly detected planet candidates: GQ Lup, 2M1207, AB Pic"]. arXiv:astro-ph/0509906v1.
- {{cite web |url=http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=V*+GQ+Lup|title=V* GQ Lup |accessdate=2008-06-13 |work= SIMBAD}}
- {{cite web |url=https://www.newscientist.com/article.ns?id=dn7225 |title=First image of exoplanet orbiting Sun-like star |accessdate=2008-06-09 |work=New Scientist |date=2005-04-04 |first=Kelly |last=Young}}
- {{cite web |url=http://news.bbc.co.uk/1/hi/wales/4408187.stm |title=Telescopes see 'distant planet' |accessdate=2008-06-09 |work=BBC News |date=2005-04-04}}
- {{cite web |url=http://www.space.com/scienceastronomy/050430_exoplanet_image.html |title=Fresh Debate over First Photo of Extrasolar Planet |accessdate=2008-06-09 |work=SPACE.com |date=2005-04-30 |first=Robert Roy |last=Britt}}
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{{Stars of Lupus}}
Category:Planetary systems with one confirmed planet
Category:Lupus (constellation)