Astronomy:HD 108236
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Short description: G-type main sequence star in the constellation Centaurus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 | 0.867+0.047−0.046 M☉ |
| Radius | 0.876±0.007 R☉ |
| Luminosity | 0.707±0.032 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+3.3−3.4 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 an age of 6.7+3.3−3.4 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
In 2020, four planets orbiting HD 108236 were discovered[6] by the transit method, followed by another one in 2021.[7]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 4.23+0.41−0.39 M⊕ | 0.0451±0.0004 | 3.7958785+0.0000076−0.0000070 | 0.067+0.025−0.026 | 88.23±0.32° | 1.587±0.028 R⊕ |
| c | 8.90+0.67−0.64 M⊕ | 0.0626±0.0006 | 6.2036717+0.0000092−0.0000100 | 0.091+0.021−0.033 | 88.8±0.2° | 2.122±0.025 R⊕ |
| d | 7.75+0.91−0.62 M⊕ | 0.1087±0.0010 | 14.175818+0.000024−0.000023 | 0.075+0.021−0.022 | 88.8±0.1° | 2.629±0.031 R⊕ |
| e | 8.2+3.8−1.2 M⊕ | 0.1348±0.0012 | 19.5901277±0.000030 | 0.073+0.014−0.017 | 89.3±0.1° | 3.008±0.032 R⊕ |
| f | 3.95+0.46−0.32 M⊕ | 0.1773±0.0016 | 29.53935+0.00012−0.00014 | 0.024+0.024−0.016 | 89.07±0.03° | 1.89±0.04 R⊕ |
See also
- List of exoplanets discovered in 2020 - HD 108236 b through e
- List of exoplanets discovered in 2021 - HD 108236 f
References
- ↑ 1.0 1.1 1.2 "HD 108236". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+108236.
- ↑ 2.0 2.1 2.2 2.3 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 Hoyer, S. et al. (2022), "Characterization of the HD 108236 system with CHEOPS and TESS Confirmation of a fifth transiting planet", Astronomy & Astrophysics 668: A117, doi:10.1051/0004-6361/202243720, Bibcode: 2022A&A...668A.117H
- ↑ 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, doi:10.1088/0067-0049/212/1/10, Bibcode: 2014ApJS..212...10P
- ↑ 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, doi:10.3847/1538-3881/153/2/54, Bibcode: 2017AJ....153...54P
- ↑ Daylan, Tansu; Pingle, Kartik; Wright, Jasmine; Guenther, Maximilian N.; Stassun, Keivan G.; Kane, Stephen R.; Vanderburg, Andrew; Jontof-Hutter, Daniel 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. doi:10.3847/1538-3881/abd73e. Bibcode: 2021AJ....161...85D.
- ↑ 7.0 7.1 Bonfanti, A.; Delrez, L.; Hooton, M. J.; Wilson, T. G.; Fossati, L.; Alibert, Y.; Hoyer, S.; Mustill, A. J. et al. (2021). "CHEOPS observations of the HD 108236 planetary system: A fifth planet, improved ephemerides, and planetary radii". Astronomy & Astrophysics 646: A157. doi:10.1051/0004-6361/202039608. Bibcode: 2021A&A...646A.157B.
Coordinates: 
12h 26m 17.8916s, −51° 21′ 46.2141″
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