GQ Lupi
File:GQLupLightCurve.png A visual band light curve for GQ Lupi. The main plot (from ASAS data[1]), shows the long-term variability, and the inset plot (adapted from Broeg et al.[2]) shows the short-term periodic brightness variation. | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lupus |
| Right ascension | Template:RA[3] |
| Declination | Template:DEC[3] |
| Apparent magnitude (V) | 11.40[4] |
| Characteristics | |
| A | |
| Evolutionary stage | T Tauri star[5] |
| Spectral type | K7V[4] |
| B−V Template:Engvar | 0.96[4] |
| Variable type | T Tauri variable[5] |
| C (2MASS J15491331)Template:Efn | |
| Evolutionary stage | Red dwarf |
| Spectral type | M4[6] |
| Astrometry | |
| Proper motion (μ) | RA: Script error: No such module "val".[3] mas/yr Dec.: Script error: No such module "val".[3] mas/yr |
| Parallax (π) | 6.5868±0.0473 mas[3] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | ~5[7] |
| Orbit | |
| Primary | GQ Lupi A |
| Companion | GQ Lupi C (2MASS J15491331)Template:Efn |
| Semi-major axis (a) | Script error: No such module "val".[6] |
| Details | |
| A | |
| Mass | 0.7[8] Template:Solar mass |
| Age | <2 million[8] years |
| C (2MASS J15491331)Template:Efn | |
| Mass | ~0.15[6] Template:Solar mass |
| Radius | 0.21[6] Template:Solar radius |
| Temperature | 3190 K |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| CD−35°10525, GQ Lup[4] | |
| Database references | |
| SIMBAD | data |
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GQ Lupi is a T Tauri variable star approximately 495 light-years away[3] in the constellation of Lupus.[5] The star is young and has about 70% of the Sun's mass.[8]
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.[6]
Possible planetary system
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.[9] 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".[10] GQ Lupi b is listed as "confirmed planet" as in 2020.[11]
Notes
References
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- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ a b c d e f Template:Cite Gaia DR2
- ↑ a b c d Template:Cite simbad
- ↑ a b c Astrometric 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. Script error: No such module "CS1 identifiers".. Bibcode:2008A&A...484..281NScript error: No such module "check bibcode".
- ↑ a b c d e Script error: No such module "Citation/CS1".
- ↑ From parallax and apparent magnitude.
- ↑ a b c First image of exoplanet orbiting Sun-like star, Kelly Young, April 4, 2005, NewScientist.com news service. Accessed on line June 13, 2008.
- ↑ Is this a Brown Dwarf or an Exoplanet? New Young Sub-stellar Companion Imaged with the VLT Script error: No such module "webarchive"., ESO Press Release 09/05, April 7, 2005. Accessed on line June 13, 2008.
- ↑ Lists of Extrasolar Planets Script error: No such module "webarchive"., IAU Working Group on Extrasolar Planets, August 28, 2006. Accessed on line June 13, 2008.
- ↑ openexoplanetcatalogue.com GQ Lup
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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. Script error: No such module "CS1 identifiers".. Bibcode:2005AN....326..958GScript error: No such module "check bibcode".
- R. Neuhaeuser (2005). "Homogeneous comparison of directly detected planet candidates: GQ Lup, 2M1207, AB Pic". arXiv:astro-ph/0509906v1.
- Script error: No such module "citation/CS1".
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