HD 108236

Summary

HD 108236
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
Distance210.6 ± 0.2 ly
(64.57 ± 0.05 pc)
Details[3]
Mass0.869+0.050
−0.048
 M
Radius0.877±0.008 R
Luminosity0.708±0.047 L
Surface gravity (log g)4.49±0.11 cgs
Temperature5660±61 K
Metallicity [Fe/H]−0.28±0.04 dex
Age6.7+4.0
−5.1
 Gyr
Other designations
CD−50 6971, HIP 60689, TOI-1233, TYC 8243-1948-1, GSC 08243-01948, 2MASS J12261789-5121462[1]
Database references
SIMBADdata

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]

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

HD 108236's planets

In 2020, four planets orbiting HD 108236 were discovered[6] by the transit method, followed by another one in 2021.[3]

The HD 108236 planetary system[3][6]
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±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

  1. ^ a b c "HD 108236". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-17.
  2. ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
  3. ^ a b c d 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". Astronomy & Astrophysics. 646: A157. arXiv:2101.00663. doi:10.1051/0004-6361/202039608. S2CID 230437723.
  4. ^ 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
  5. ^ 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
  6. ^ a b 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. (2021). "TESS Discovery of a Super-Earth and Three Sub-Neptunes Hosted by the Bright, Sun-like Star HD 108236". The Astronomical Journal. 161 (2): 85. arXiv:2004.11314. doi:10.3847/1538-3881/abd73e. S2CID 216080635.

Coordinates: Sky map 12h 26m 17.8916s, −51° 21′ 46.2141″