Astronomy:HAT-P-23

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Short description: Star in the constellation Delphinus
HAT-P-23 / Moriah
Observation data
Equinox J2000.0]] (ICRS)
Constellation Delphinus
Right ascension  20h 24m 29.7235s[1]
Declination +16° 45′ 43.8103″[1]
Apparent magnitude (V) 11.94[2]
Characteristics
Spectral type G0V
Apparent magnitude (J) 11.103±0.022[3]
Apparent magnitude (H) 10.846±0.022[3]
Apparent magnitude (K) 10.791±0.020[3]
Variable type Planetary transit[4]
Astrometry
Radial velocity (Rv)-14.324 km/s
Proper motion (μ) RA: 13.263±0.050[1] mas/yr
Dec.: −5.412±0.049[1] mas/yr
Parallax (π)2.7129 ± 0.0351[1] mas
Distance1,200 ± 20 ly
(369 ± 5 pc)
Details[4]
Mass1.13±0.035 M☉
Radius1.203±0.074 R☉
Luminosity1.58±0.23 L☉
Surface gravity (log g)4.33±0.05 cgs
Temperature5905±80 K
Metallicity0.15±0.04
Rotation7.015 d[5]
Rotational velocity (v sin i)8.1±0.5 km/s
Age4.0±1.0 Gyr
Other designations
Moriah, Gaia DR2 1808938730710633984, TYC 1632-1396-1, GSC 01632-01396, 2MASS J20242972+1645437[2]
Database references
SIMBADdata

HAT-P-23 is a G-type main-sequence star about 1200 light-years away. It has a rapid rotation (rotation period equal to 7 days) for its advanced age of 4 billion years, and exhibits a strong starspot activity.[6] The star may be in the process of being spun up by the giant planet on close orbit.[7] The star is enriched in heavy elements, having about 140% amount of metals compared to solar abundance.

Naming

In 2019, the HAT-P-23 star has received a proper name Moriah and planet HAT-P-23b - Jebus at an international NameExoWorlds contest.[8] These names mean the ancient name of the mount at the center of Jerusalem city, and ancient (pre-Roman) name of Jerusalem itself, respectively.

Planetary system

In 2010 a transiting hot Jupiter like planet was detected.[4] It has a measured dayside temperature of 2154±90 K.[9] The planet is believed to be on an unstable orbit, and expected to be engulfed by its parent star about 7.5+2.9−1.8 million years from now,[4] although timing measurements of multiple transits since the discovery have been unable to detect any reduction in the orbital period.[5][10] The planetary orbit is probably aligned with the equatorial plane of the star, misalignment equal to 15±22°.[11] The color of planetary atmosphere is grey.[12] The atmosphere is mostly devoid of clouds, and shows tentatively a presence of Titanium(II) oxide.[13]

Size comparison of HAT-P-23 b and Jupiter
The HAT-P-23 planetary system[4][14][9][12]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b (Jebus) 2.09±0.111 MJ 0.0232±0.0002 1.2128868±0.0000004 0.096 85.1±1.5° 1.224±0.037 RJ

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. ↑ 2.0 2.1 HAT-P-23 -- Star
  3. ↑ 3.0 3.1 3.2 Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W. et al. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal 131 (2): 1163–1183. doi:10.1086/498708. ISSN 0004-6256. Bibcode: 2006AJ....131.1163S.  Vizier catalog entry
  4. ↑ 4.0 4.1 4.2 4.3 4.4 Bakos, G. Á.; Hartman, J.; Torres, G.; Latham, D. W.; Kovács, Géza; Noyes, R. W.; Fischer, D. A.; Johnson, J. A. et al. (2010), "HAT-P-20b–HAT-P-23b: FOUR MASSIVE TRANSITING EXTRASOLAR PLANETS", The Astrophysical Journal 742 (2): 116, doi:10.1088/0004-637X/742/2/116 
  5. ↑ 5.0 5.1 Salisbury, M.A. et al. (2021). "Monitoring of transiting exoplanets and their host stars with small aperture telescopes". New Astronomy 83: 101477. doi:10.1016/j.newast.2020.101477. Bibcode: 2021NewA...8301477S. 
  6. ↑ Schrijver, Carolus J. (2020), "Testing the solar activity paradigm in the context of exoplanet transits", The Astrophysical Journal 890 (2): 121, doi:10.3847/1538-4357/ab67c1, Bibcode: 2020ApJ...890..121S 
  7. ↑ Maciejewski, G.; Fernández, M.; Aceituno, F.; Martín-Ruiz, S.; Ohlert, J.; Dimitrov, D.; Szyszka, K.; von Essen, C. et al. (2018), "Planet-star interactions with precise transit timing. I. The refined orbital decay rate for WASP-12 b and initial constraints for HAT-P-23 b, KELT-1 b, KELT-16 b, WASP-33 b, and WASP-103 b", Acta Astronomica 68 (4): 371, doi:10.32023/0001-5237/68.4.4, Bibcode: 2018AcA....68..371M 
  8. ↑ IAU 100 NameExoWorlds Approved Names
  9. ↑ 9.0 9.1 O'Rourke, Joseph G.; Knutson, Heather A.; Zhao, Ming; Fortney, Jonathan J.; Burrows, Adam; Agol, Eric; Deming, Drake; Désert, Jean-Michel et al. (2014). "WARMSPITZERAND PALOMAR NEAR-IR SECONDARY ECLIPSE PHOTOMETRY OF TWO HOT JUPITERS: WASP-48b AND HAT-P-23b". The Astrophysical Journal 781 (2): 109. doi:10.1088/0004-637X/781/2/109. Bibcode: 2014ApJ...781..109O. 
  10. ↑ Patra, Kishore C.; Winn, Joshua N.; Holman, Matthew J.; Gillon, Michael; Burdanov, Artem; Jehin, Emmanuel; Delrez, Laetitia; Pozuelos, Francisco J. et al. (2020), "The continuing search for evidence of tidal orbital decay of hot Jupiters", The Astronomical Journal 159 (4): 150, doi:10.3847/1538-3881/ab7374, Bibcode: 2020AJ....159..150P 
  11. ↑ Moutou, Claire; Diaz, Rodrigo F.; Udry, Stephane; Hebrard, Guillaume; Bouchy, Francois; Santerne, Alexandre; Ehrenreich, David; Arnold, Luc et al. (2011), Spin-orbit inclinations of the exoplanetary systems HAT-P-8, HAT-P-9 HAT-P-16, and HAT-P-23, doi:10.1051/0004-6361/201116760, Bibcode: 2011A&A...533A.113M 
  12. ↑ 12.0 12.1 Ciceri, S.; Mancini, L.; Southworth, J.; Bruni, I.; Nikolov, N.; d'Ago, G.; Schröder, T.; Bozza, V. et al. (2015), "Physical properties of the HAT-P-23 and WASP-48 planetary systems from multi-colour photometry", Astronomy & Astrophysics 577: A54, doi:10.1051/0004-6361/201425449, Bibcode: 2015A&A...577A..54C 
  13. ↑ Weaver, Ian C.; López-Morales, Mercedes; Alam, Munazza K.; Espinoza, Néstor; Rackham, Benjamin V.; Goyal, Jayesh M.; MacDonald, Ryan J.; Lewis, Nikole K. et al. (2021), "ACCESS: An Optical Transmission Spectrum of the High-gravity Hot Jupiter HAT-P-23b", The Astronomical Journal 161 (6): 278, doi:10.3847/1538-3881/abf652, Bibcode: 2021AJ....161..278W 
  14. ↑ Ramón-Fox, Felipe G.; Sada, Pedro V. (2012), "PARAMETERS OF RECENT TRANSITS OF HAT-P-23b", Revista Mexicana de Astronomía y Astrofísica 49: 71, Bibcode: 2013RMxAA..49...71R 

Coordinates: Sky map 20h 24m 29.7235s, +16° 45′ 43.8103″




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