HD 86226
| Observation data EpochJ2000.0EquinoxJ2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 09h56m29.844s[1] |
| Declination | –24° 05′ 57.80″[1] |
| Apparent magnitude(V) | 7.93[2] |
| Characteristics | |
| Spectral type | G2V[3] |
| Apparent magnitude(B) | 8.577[2] |
| Apparent magnitude(R) | 7.71[2] |
| Apparent magnitude(J) | 6.839±0.019[2] |
| Apparent magnitude(H) | 6.577±0.034[2] |
| Apparent magnitude(K) | 6.463±0.023[2] |
| B−Vcolor index | 0.647±0.014[2] |
| V−Rcolor index | 0.22[4] |
| Astrometry | |
| Radial velocity(Rv) | +19.56±0.19[4]km/s |
| Proper motion(μ) | RA:–177.127mas/yr[1] Dec.:+47.099mas/yr[1] |
| Parallax(π) | 21.9301 ± 0.0267mas[1] |
| Distance | 148.7 ± 0.2ly (45.60 ± 0.06pc) |
| Absolute magnitude(MV) | 4.66[2] |
| Details[5] | |
| Mass | 1.019+0.061 −0.066M☉ |
| Radius | 1.053+0.026 −0.026R☉ |
| Luminosity | 1.180+0.036 −0.029L☉ |
| Surface gravity(logg) | 4.400+0.029 −0.032cgs |
| Temperature | 5863±88K |
| Metallicity[Fe/H] | 0.018+0.057 −0.043dex |
| Rotational velocity(vsini) | 3.6[6]km/s |
| Age | 4.6+3.7 −2.7Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 86226is astarwith a pair of orbitingexoplanetcompanions, found in theconstellation of Hydra.With anapparent visual magnitudeof 7.93,[2]it is too dim to be visible with the naked eye. The distance to this system has been determined by theparallaxmethod, yielding a range of 149light years.It is receding with a heliocentricradial velocityof +19.6 km/s.[4]A survey in 2015 has ruled out the existence of any stellar companions at projected distances above 12astronomical units.[8]
This is an ordinaryG-type main-sequence starwith astellar classificationof G2V.[3]It is similar in size, mass, and composition to the Sun,[5]although it isn't considered asolar twin.[9]The age is about the same; roughly 4.6 billion years old. The star is radiating 18% greater luminosity (compared to the Sun) from itsphotosphereat aneffective temperatureof 5,863 K.[5]It is spinning with aprojected rotational velocityof 3.6 km/s.[6]
As of 2014[update],Radio emissionat a frequency of 150 MHz has been tentatively detected from the proximity of this system, although it is not clear whether the star or a satellite orbiting a rapidly rotating planet is the source.[10]
Planetary system
[edit]Due to the periodic spectrum shifts when it had when placed under aDoppler test,13 Magellan Doppler Velocity observations were made of an object found near the star. The object discovered in 2010 had a Keplerian orbit, was declared anexoplanetand dubbed HD 86226 b.[11]A hotSuper-Earthplanet calledHD 86226 cwas discovered in 2020.[5]It may be undergoing considerable atmospheric mass loss.[12]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| c | 7.25+1.19 −1.12M🜨 |
0.049±0.001 | 3.98442±0.00018 | 0.075+0.065 −0.048 |
86.45+0.26 −0.16° |
2.16±0.08R🜨 |
| b | 0.45+0.04 −0.05MJ |
2.73±0.06 | 1628+22 −21 |
0.059+0.062 −0.039 |
— | — |
See also
[edit]- HD 129445
- HD 152079
- HD 164604
- HD 175167
- List of exoplanets discovered in 2010- HD 86226 b
- List of exoplanets discovered in 2020- HD 86226 c
References
[edit]- ^abcdVallenari, A.; et al. (Gaia collaboration) (2023)."GaiaData Release 3. Summary of the content and survey properties ".Astronomy and Astrophysics.674:A1.arXiv:2208.00211.Bibcode:2023A&A...674A...1G.doi:10.1051/0004-6361/202243940.S2CID244398875. Gaia DR3 record for this sourceatVizieR.
- ^abcdefghiAnderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation".Astronomy Letters.38(5): 331.arXiv:1108.4971.Bibcode:2012AstL...38..331A.doi:10.1134/S1063773712050015.S2CID119257644.
- ^abHouk, Nancy; Smith-Moore, M. (1978),Michigan catalogue of two-dimensional spectral types for the HD stars,vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan,Bibcode:1988mcts.book.....H
- ^abcBrown, A. G. A.;et al. (Gaia collaboration) (August 2018)."GaiaData Release 2: Summary of the contents and survey properties ".Astronomy & Astrophysics.616.A1.arXiv:1804.09365.Bibcode:2018A&A...616A...1G.doi:10.1051/0004-6361/201833051.Gaia DR2 record for this sourceatVizieR.
- ^abcdeTeske, Johanna; et al. (2020)."TESS Reveals a Short-period Sub-Neptune Sibling (HD 86226c) to a Known Long-period Giant Planet".The Astronomical Journal.160(2): 96.arXiv:2007.13927.Bibcode:2020AJ....160...96T.doi:10.3847/1538-3881/ab9f95.S2CID220830943.
- ^abLlorente de Andrés, F.; et al. (October 2021)."The evolution of lithium in FGK dwarf stars. The lithium-rotation connection and the Li desert".Astronomy and Astrophysics.654:A137.arXiv:2108.05852.Bibcode:2021A&A...654A.137L.doi:10.1051/0004-6361/202141339.ISSN0004-6361.
- ^"HD 86226".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2010-02-10.
- ^Mugrauer, M.; Ginski, C. (12 May 2015)."High-contrast imaging search for stellar and substellar companions of exoplanet host stars".Monthly Notices of the Royal Astronomical Society.450(3): 3127–3136.Bibcode:2015MNRAS.450.3127M.doi:10.1093/mnras/stv771.hdl:1887/49340.Retrieved19 June2020.
- ^Datson, Juliet; et al. (February 2015). "Spectroscopic study of solar twins and analogues".Astronomy & Astrophysics.574:12.arXiv:1412.8168.Bibcode:2015A&A...574A.124D.doi:10.1051/0004-6361/201425000.S2CID53708062.A124.
- ^Sirothia, S. K.; et al. (February 2014)."Search for 150 MHz radio emission from extrasolar planets in the TIFR GMRT Sky Survey".Astronomy & Astrophysics.562:9.Bibcode:2014A&A...562A.108S.doi:10.1051/0004-6361/201321571.A108.
- ^Arriagada, Pamela; et al. (2010). "Five Long-period Extrasolar Planets in Eccentric orbits from the Magellan Planet Search Program".The Astrophysical Journal.711(2): 1229–1235.arXiv:1001.4093.Bibcode:2010ApJ...711.1229A.doi:10.1088/0004-637X/711/2/1229.S2CID118682009.
- ^Gupta, Akash; Schlichting, Hilke E. (July 2021)."Caught in the act: core-powered mass-loss predictions for observing atmospheric escape".Monthly Notices of the Royal Astronomical Society.504(3): 4634–4648.arXiv:2103.08785.Bibcode:2021MNRAS.504.4634G.doi:10.1093/mnras/stab1128.
- ^Marmier, M.; et al. (March 2013). "The CORALIE survey for southern extrasolar planets XVII. New and updated long period and massive planets".Astronomy and Astrophysics.551:A90.arXiv:1211.6444.Bibcode:2013A&A...551A..90M.doi:10.1051/0004-6361/201219639.S2CID59467665.
External links
[edit]- "HD 86226".SAO/NASAAstrophysics Data System(ADS)(Database query).