HD_233731 Latitude and Longitude:
Sky map 10h 22m 43.5924s, +50° 07′ 42.0635″
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HD 233731
Observation data
Epoch J2000       Equinox J2000
Constellation Ursa Major
Right ascension 10h 22m 43.5923s [1]
Declination +50° 07′ 42.062″ [1]
Apparent magnitude (V) 9.732 [2]
Characteristics
Spectral type G5V [3]
B−V color index 0.86 [3]
Astrometry
Radial velocity (Rv)12.86(15) [1] km/s
Proper motion (μ) RA: −26.110(14)  mas/ yr [1]
Dec.: 83.806(16)  mas/ yr [1]
Parallax (π)12.2731 ± 0.0155  mas [1]
Distance265.7 ± 0.3  ly
(81.5 ± 0.1  pc)
Absolute magnitude (MV)5.22±0.14 [2]
Details [3]
Mass0.936+0.028
−0.033  M☉
Radius1.062+0.046
−0.013  R☉
Luminosity0.77±0.09 [2]  L☉
Surface gravity (log g)4.357+0.039
−0.005  cgs
Temperature5,314±50  K
Metallicity [Fe/H]0.30±0.09  dex
Rotation28.7±0.4 d
Rotational velocity (v sin i)1.65±0.26 km/s
Age9.0+1.4
−2.2 Gyr [3]
12.4±2.6 [2]  Gyr
Other designations
HAT-P-22, Gaia DR2 846946629987527168, HD 233731, TYC 3441-925-1, GSC 03441-00925, 2MASS J10224361+5007420 [4]
Database references
SIMBAD data

HD 233731, or HAT-P-22, is a suspected multiple star system in the northern circumpolar constellation of Ursa Major. It is invisible to the naked eye, having an apparent visual magnitude of 9.732. [2] This system is located at a distance of 267  light years from the Sun based on parallax, and is drifting further away with a radial velocity of +13 km/s. [1]

The stellar classification of the primary is G5V, [3] matching an ordinary G-type main-sequence star. The star has a low level of stellar activity with an estimated age of 9 to 12 billion years old. Its metallicity is twice that of the Sun, unusual for its advanced age. [3] HD 233731 has a similar mass and radius as the Sun, and is spinning with a rotation period of 28.7 days. [3] It is radiating 77% [2] of the luminosity of the Sun from its photosphere at an effective temperature of 5314 K. [3]

A faint stellar companion (2MASS J10224397+5007504) with a red hue is located at an angular separation of 9 arcseconds from the primary. [2] In 2015, a spectroscopic stellar companion was reported with a semimajor axis of less than 33  AU. This star has an effective temperature of 4,000+250
−400 K with a mass of 0.63+0.07
−0.17 M☉. [5]

Planetary system

In 2010 a transiting hot Jupiter like planet was detected, designated HAT-P-22b. [2] It has an equilibrium temperature of 1,463±19 K, and planetary atmosphere is cloudy. [6] The measurement of Rossiter-McLaughlin effect in 2018 has allowed to detect what the planetary orbit is well aligned with the equatorial plane of the star, with a misalignment angle equal to 25°±18°. [3]

In 2017, analysis of additional HARPS data showed a long-term trend that suggested the presence of an additional orbiting companion, HAT-P-22c. [7]

Size comparison of HAT-P-22 b and Jupiter
The HAT-P-22 planetary system [2] [3] [7]
Companion
(in order from star) 		Mass Semimajor axis
( AU) 		Orbital period
( days) 		Eccentricity Inclination Radius
b 2.192+0.073
−0.013  MJ 		0.04171+0.00042
−0.00050 		3.21223328 0.016±0.009 86.46±0.41 ° 1.060±0.048  RJ
c (unconfirmed) ≥3.0 MJ — ≥20.8 years — — —

References

  1. ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data 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. S2CID  244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b c d e f g h i Bakos, G. Á.; et al. (2010), "HAT-P-20b – HAT-P-23b: Four Massive Transiting Extrasolar Planets", The Astrophysical Journal, 742 (2): 116, arXiv: 1008.3388, Bibcode: 2011ApJ...742..116B, doi: 10.1088/0004-637X/742/2/116, S2CID  119182075.
  3. ^ a b c d e f g h i j Mancini, L.; et al. (2018), "The GAPS programme with HARPS-N at TNG XVI. Measurement of the Rossiter-McLaughlin effect of transiting planetary systems HAT-P-3, HAT-P-12, HAT-P-22, WASP-39, and WASP-60", Astronomy & Astrophysics, A41: 613, arXiv: 1802.03859, Bibcode: 2018A&A...613A..41M, doi: 10.1051/0004-6361/201732234, S2CID  73565379.
  4. ^ "HD 233731". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-12-10.{{ cite web}}: CS1 maint: postscript ( link)
  5. ^ Piskorz, Danielle; et al. (2015), "Friends of Hot Jupiters. III. An Infrared Spectroscopic Search for Low-Mass Stellar Companions", The Astrophysical Journal, 814 (2): 148, arXiv: 1510.08062, Bibcode: 2015ApJ...814..148P, doi: 10.1088/0004-637X/814/2/148, S2CID  11525988.
  6. ^ Turner, Jake D.; et al. (2016), "Ground-based near-UV observations of 15 transiting exoplanets: Constraints on their atmospheres and no evidence for asymmetrical transits", Monthly Notices of the Royal Astronomical Society, 459 (1): 789–819, arXiv: 1603.02587, Bibcode: 2016MNRAS.459..789T, doi: 10.1093/mnras/stw574, S2CID  8769245.
  7. ^ a b Bonomo, A. S.; et al. (2017), "The GAPS Programme with HARPS-N at TNG. XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets", Astronomy and Astrophysics, 602, A107, arXiv: 1704.00373, Bibcode: 2017A&A...602A.107B, doi: 10.1051/0004-6361/201629882.


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