HD 108236
HD 108236 is a G-type main-sequence star. Its surface temperature is 5660±61 K. HD 108236 is severely depleted in heavy elements compared to the Sun, with a metallicity Fe/H index of −0.28±0.04 (52% of the Solar System), and is probably older than the Sun at 6.7+4.0
−5.1 billion years.[3]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 12h 26m 17.8916s[1] |
| Declination | −51° 21′ 46.2141″[1] |
| Apparent magnitude (V) | 9.24 |
| Characteristics | |
| Evolutionary stage | main-sequence star |
| Spectral type | G5V |
| Astrometry | |
| Radial velocity (Rv) | 16.78±0.22[2] km/s |
| Proper motion (μ) | RA: −70.627[2] mas/yr Dec.: −49.758[2] mas/yr |
| Parallax (π) | 15.4861 ± 0.0127[2] mas |
| Distance | 210.6 ± 0.2 ly (64.57 ± 0.05 pc) |
| Details[3] | |
| Mass | 0.869+0.050 −0.048 M☉ |
| Radius | 0.877±0.008 R☉ |
| Luminosity | 0.708±0.047 L☉ |
| Surface gravity (log g) | 4.49±0.11 cgs |
| Temperature | 5660±61 K |
| Metallicity [Fe/H] | −0.28±0.04 dex |
| Age | 6.7+4.0 −5.1 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
According to WISE mission data, the star was suspected to be surrounded by a debris disk, but a reanalysis of the data rejected the debris disk hypothesis by 2014.[4] The reason for the false positive was contamination from a nearby infrared source.[5]
Planetary system
In 2020, four planets orbiting HD 108236 were discovered[6] by the transit method, followed by another one in 2021.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 4.2±1.2 M⊕ | 0.0469±0.0017 | 3.79523+0.00047 −0.00044 |
0 | — | 1.586±0.098 R⊕ |
| c | 9±2 M⊕ | 0.0651±0.0024 | 6.2037+0.00064 −0.00052 |
0 | — | 2.068+0.10 −0.091 R⊕ |
| d | 7.8+3.2 −1.8 M⊕ |
0.1131±0.004 | 14.1756+0.001 −0.0011 |
0 | — | 2.72±0.11 R⊕ |
| e | 8.4+6.6 −1.4 M⊕ |
0.14±0.0052 | 19.592±0.002 | 0 | — | 3.12+0.13 −0.12 R⊕ |
| f | 4+2 −1 M⊕ |
0.1759 | 29.54 | 0 | — | 2.0172+0.052 −0.057 R⊕ |
References
- "HD 108236". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-17.
- Brown, A. G. A.; et al. (Gaia collaboration). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics (in press). arXiv:2012.01533. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
- Bonfanti, A.; Delrez, L.; Hooton, M. J.; Wilson, T. G.; Fossati, L.; Alibert, Y.; Hoyer, S.; Mustill, A. J.; Osborn, H. P.; Adibekyan, V.; Gandolfi, D.; Salmon, S.; Sousa, S. G.; Tuson, A.; Van Grootel, V.; Cabrera, J.; Nascimbeni, V.; Maxted, P. F. L.; Barros, S. C. C.; Billot, N.; Bonfils, X.; Borsato, L.; Broeg, C.; Davies, M. B.; Deleuil, M.; Demangeon, O. D. S.; Fridlund, M.; Lacedelli, G.; Lendl, M.; et al. (2021). "CHEOPS observations of the HD 108236 planetary system: A fifth planet, improved ephemerides, and planetary radii". arXiv:2101.00663.
- Patel, Rahul I.; Metchev, Stanimir A.; Heinze, Aren (2014), "A Sensitive Identification of Warm Debris Disks in the Solar Neighborhood Through Precise Calibration of Saturated Wise Photometry", The Astrophysical Journal Supplement Series, 212 (1): 10, arXiv:1403.3435, Bibcode:2014ApJS..212...10P, doi:10.1088/0067-0049/212/1/10, S2CID 119219094
- Patel, Rahul I.; Metchev, Stanimir A.; Heinze, Aren; Trollo, Joseph (2016), "The Faintest WISE debris Disks: Enhanced Methods for Detection and Verification", The Astronomical Journal, 153 (2): 54, arXiv:1612.04818, Bibcode:2017AJ....153...54P, doi:10.3847/1538-3881/153/2/54, S2CID 3006490
- Daylan, Tansu; Pingle, Kartik; Wright, Jasmine; Guenther, Maximilian N.; Stassun, Keivan G.; Kane, Stephen R.; Vanderburg, Andrew; Jontof-Hutter, Daniel; Rodriguez, Joseph E.; Shporer, Avi; Huang, Chelsea; Mikal-Evans, Tom; Badenas-Agusti, Mariona; Collins, Karen A.; Rackham, Benjamin; Quinn, Sam; Cloutier, Ryan; Collins, Kevin I.; Guerra, Pere; Jensen, Eric L. N.; Kielkopf, John F.; Massey, Bob; Schwarz, Richard P.; Charbonneau, David; Lissauer, Jack J.; Irwin, Jonathan M.; Basturk, Ozgur; Fulton, Benjamin; Soubkiou, Abderahmane; et al. (2020). "TESS discovery of a super-Earth and three sub-Neptunes hosted by the bright, Sun-like star HD 108236". arXiv:2004.11314.
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