Astronomy:HD 108236

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Short description: G-type main sequence star in the constellation Centaurus
HD 108236
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
Distance210.6 ± 0.2 ly
(64.57 ± 0.05 pc)
Details[3]
Mass0.867+0.047−0.046 M☉
Radius0.876±0.007 R☉
Luminosity0.707±0.032 L☉
Surface gravity (log g)4.49±0.11 cgs
Temperature5660±61 K
Metallicity [Fe/H]−0.28±0.04 dex
Age6.7+3.3−3.4 Gyr
Other designations
CD−50 6971, HIP 60689, 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 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

HD 108236's planets

In 2020, four planets orbiting HD 108236 were discovered[6] by the transit method, followed by another one in 2021.[7]

The HD 108236 planetary system[3][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

References

  1. ↑ 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. ↑ 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. ↑ 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 
  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, doi:10.1088/0067-0049/212/1/10, Bibcode: 2014ApJS..212...10P 
  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, doi:10.3847/1538-3881/153/2/54, Bibcode: 2017AJ....153...54P 
  6. ↑ 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. ↑ 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: Sky map 12h 26m 17.8916s, −51° 21′ 46.2141″



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