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HAT-P-23 is a G-type main-sequence star 1192 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. The star may be in the process of being spun up by the giant planet on close orbit. 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. 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. It has a measured dayside temperature of 2154±90 K. The planet is believed to be on an unstable orbit, and expected to be engulfed by its parent star about 7.5
_−1.8 million years from now, although timing measurements of multiple transits since the discovery have been unable to detect any reduction in the orbital period. The planetary orbit is probably aligned with the equatorial plane of the star, misalignment equal to 15±22°. The color of planetary atmosphere is grey. The atmosphere is mostly devoid of clouds, and shows tentatively a presence of Titanium(II) oxide.

References

1. ^ 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. ^ HAT-P-23 -- Star
3. ^ Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W.; Chester, Thomas; Elias, Jonathan H.; Huchra, John P.; Liebert, James W.; Lonsdale, Carol J.; Monet, David G.; Price, Stephan; Seitzer, Patrick; Jarrett, Thomas H.; Kirkpatrick, J. Davy; Gizis, John E.; Howard, Elizabeth V.; Evans, Tracey E.; Fowler, John W.; Fullmer, Linda; Hurt, Robert L.; Light, Robert M.; Kopan, Eugene L.; Marsh, Kenneth A.; McCallon, Howard L.; Tam, Robert; Van Dyk, Schuyler D.; Wheelock, Sherry L. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708. ISSN 0004-6256. S2CID 18913331. Vizier catalog entry
4. ^ Bakos, G. Á.; Hartman, J.; Torres, G.; Latham, D. W.; Kovács, Géza; Noyes, R. W.; Fischer, D. A.; Johnson, J. A.; Marcy, G. W.; Howard, A. W.; Kipping, D.; Esquerdo, G. A.; Shporer, A.; Béky, B.; Buchhave, L. A.; Perumpilly, G.; Everett, M.; Sasselov, D. D.; Stefanik, R. P.; Lázár, J.; Papp, I.; Sári, P. (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
5. ^ Salisbury, M.A.; et al. (2021). "Monitoring of transiting exoplanets and their host stars with small aperture telescopes". New Astronomy. 83. 101477. arXiv:2008.08379. Bibcode:2021NewA...8301477S. doi:10.1016/j.newast.2020.101477.
6. Schrijver, Carolus J. (2020), "Testing the solar activity paradigm in the context of exoplanet transits", The Astrophysical Journal, 890 (2): 121, arXiv:2001.01093, Bibcode:2020ApJ...890..121S, doi:10.3847/1538-4357/ab67c1, S2CID 209862471
7. Maciejewski, G.; Fernández, M.; Aceituno, F.; Martín-Ruiz, S.; Ohlert, J.; Dimitrov, D.; Szyszka, K.; von Essen, C.; Mugrauer, M.; Bischoff, R.; Michel, K. -U.; Mallonn, M.; Stangret, M.; Moździerski, D. (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, arXiv:1812.02438, Bibcode:2018AcA....68..371M, doi:10.32023/0001-5237/68.4.4, S2CID 118895482
8. IAU 100 NameExoWorlds Approved Names
9. ^ O'Rourke, Joseph G.; Knutson, Heather A.; Zhao, Ming; Fortney, Jonathan J.; Burrows, Adam; Agol, Eric; Deming, Drake; Désert, Jean-Michel; Howard, Andrew W.; Lewis, Nikole K.; Showman, Adam P.; Todorov, Kamen O. (2014). "WARMSPITZERAND PALOMAR NEAR-IR SECONDARY ECLIPSE PHOTOMETRY OF TWO HOT JUPITERS: WASP-48b AND HAT-P-23b". The Astrophysical Journal. 781 (2): 109. arXiv:1310.0011. Bibcode:2014ApJ...781..109O. doi:10.1088/0004-637X/781/2/109. S2CID 13149979.
10. Patra, Kishore C.; Winn, Joshua N.; Holman, Matthew J.; Gillon, Michael; Burdanov, Artem; Jehin, Emmanuel; Delrez, Laetitia; Pozuelos, Francisco J.; Barkaoui, Khalid; Benkhaldoun, Zouhair; Narita, Norio; Fukui, Akihiko; Kusakabe, Nobuhiko; Kawauchi, Kiyoe; Terada, Yuka; Bouma, L. G.; Weinberg, Nevin N.; Broome, Madelyn (2020), "The continuing search for evidence of tidal orbital decay of hot Jupiters", The Astronomical Journal, 159 (4): 150, arXiv:2002.02606, Bibcode:2020AJ....159..150P, doi:10.3847/1538-3881/ab7374, S2CID 211066260
11. Moutou, Claire; Diaz, Rodrigo F.; Udry, Stephane; Hebrard, Guillaume; Bouchy, Francois; Santerne, Alexandre; Ehrenreich, David; Arnold, Luc; Boisse, Isabelle; Bonfils, Xavier; Delfosse, Xavier; Eggenberger, Anne; Forveille, Thierry; Lagrange, Anne-Marie; Lovis, Christophe; Martinez, Patrick; Pepe, Francesco; Perrier, Christian; Queloz, Didier; Santos, Nuno C.; Segransan, Damien; Toublanc, Dominique; Troncin, Jean-Pierre; Vanhuysse, Michael; Vidal-Madjar, Alfred (2011), Spin-orbit inclinations of the exoplanetary systems HAT-P-8, HAT-P-9 HAT-P-16, and HAT-P-23, arXiv:1105.3849, Bibcode:2011A&A...533A.113M, doi:10.1051/0004-6361/201116760, S2CID 55894097
12. ^ Ciceri, S.; Mancini, L.; Southworth, J.; Bruni, I.; Nikolov, N.; d'Ago, G.; Schröder, T.; Bozza, V.; Tregloan-Reed, J.; Henning, Th. (2015), "Physical properties of the HAT-P-23 and WASP-48 planetary systems from multi-colour photometry", Astronomy & Astrophysics, 577: A54, arXiv:1503.00762, Bibcode:2015A&A...577A..54C, doi:10.1051/0004-6361/201425449, S2CID 53607610
13. Weaver, Ian C.; López-Morales, Mercedes; Alam, Munazza K.; Espinoza, Néstor; Rackham, Benjamin V.; Goyal, Jayesh M.; MacDonald, Ryan J.; Lewis, Nikole K.; Apai, Dániel; Bixel, Alex; Jordán, Andrés; Kirk, James; McGruder, Chima; Osip, David J. (2021), "ACCESS: An Optical Transmission Spectrum of the High-gravity Hot Jupiter HAT-P-23b", The Astronomical Journal, 161 (6): 278, arXiv:2104.04101, Bibcode:2021AJ....161..278W, doi:10.3847/1538-3881/abf652, S2CID 233204299
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, arXiv:1211.6481, Bibcode:2013RMxAA..49...71R

v t e Constellation of Delphinus
List of stars in Delphinus Delphinus in Chinese astronomy
Stars	Bayer α (Sualocin) β (Rotanev) γ γ δ ε (Aldulfin) ζ η θ ι κ ρ Aql (Tso Ke) Flamsteed 1 10 13 14 15 16 17 18 (Musica) Variable EU HR HU V339 QV Sge HR 7771 7774 7778 7793 7816 7824 7839 7899 7907 7975 8010 8044 HD 195019 Other HAT-P-23 (Moriah) WASP-2 WISE J2030+0749 WISE 2056+1459
Exoplanets 18 Delphini b HD 195019 b HD 196885 Ab WASP-2b TOI-6883 b
Star clusters Laevens 3 NGC 6934 NGC 7006
Nebulae NGC 6905
Galaxies	NGC 7003 7025 7028 Other ZW II 96
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