HAT-P-36

HAT-P-36 / Tuiren
Diagram showing star positions and boundaries of the Canes Venatici constellation and its surroundings
Location of HAT-P-36 (circled) within Canes Venatici
Observation data
Epoch J2000.0      Equinox ICRS
Constellation Canes Venatici
Right ascension 12h 33m 03.9061s
Declination +44° 54′ 55.196″
Apparent magnitude (V) 12.26
Characteristics
Evolutionary stage main sequence
Spectral type G5V
Astrometry
Radial velocity (Rv)−16.434 km/s
Proper motion (μ) RA: −11.622(8) mas/yr
Dec.: 8.138(10) mas/yr
Parallax (π)3.4055±0.0110 mas
Distance958 ± 3 ly
(293.6 ± 0.9 pc)
Details
Mass1.005±0.020 M☉
Radius1.023±0.018 R☉
Luminosity0.969+0.078
−0.073 L☉
Surface gravity (log g)4.33±0.16 cgs
Temperature5,550±80 K
Metallicity [Fe/H]0.27±0.09 dex
Rotation15.30±0.50 d
Rotational velocity (v sin i)24.0±0.5 km/s
Age6.6+2.9
−1.8 Gyr
Other designations
Tuiren, TYC 3020-2221-1, 2MASS J12330390+4454552, Gaia DR3 1541532207133249920
Database references
SIMBADdata
Exoplanet Archivedata

HAT-P-36, also referred to as Tuiren is a 12th magnitude G-type main-sequence star estimated to be approximately 958 light-years away from Earth in the constellation Canes Venatici. HAT-P-36 is too faint to be seen with the naked eye, but it is possible to view it with binoculars or a small telescope. In 2012 a hot Jupiter-type exoplanet was discovered orbiting HAT-P-36 with an orbital period of about 1.3 Earth days. In December 2019, HAT-P-36 was named Tuiren and its planetary companion, HAT-P-36b, was named Bran as a result of Ireland's contribution to the 2019 NameExoWorlds campaign. Bran has a mass approximately 1.8 times that of Jupiter and a radius 1.2 times larger.

Etymology

Tuiren (centre) as viewed in the Sloan Digital Sky Survey. The bright star to the top-left is TYC 3020-2195-1, an A-type main-sequence star approximately 3,156 light-years away.

HAT-P-36 and its planet are named after characters from The Birth of Bran, a story in the book Irish Fairy Tales by James Stephens. The book is a re-telling of various stories from Irish folklore. Tuiren was the aunt of the mythical hero Fionn mac Cumhaill and was turned into a hound by the fairy Uchtdealbh after Tuiren married her husband. Bran and Sceólan were the two puppies mothered by Tuiren while she was a dog. They were cousins of Fionn mac Cumhaill. The names were proposed by John Murphy, a teacher at Regina Mundi College, Cork.

Planetary system

HAT-P-36b (Bran) was discovered in 2012 by the HATNet Project using the transit method. A search for transit timing variation did not result in detection of additional planets in the system as at 2021. Surprisingly, a planetary orbital period increase by 0.014 seconds per year was detected by 2021.

The HAT-P-36b planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination
(°)		 Radius
b (Bran) 1.832 MJ 0.02366±0.00016 1.327346977(49) 0 86.76±0.076 1.233±0.025 RJ
Size comparison
Jupiter HAT-P-36b (Bran)
Jupiter Exoplanet

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
  2. 1 2 3 4 5 6 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.
  3. 1 2 3 Sonbas, E.; Karaman, N.; Özdönmez, A.; Er, H.; Dhuga, K. S.; Göğüş, E.; Nasiroglu, I.; Zejmo, M. (2022). "Probing Transit Timing Variations of three hot Jupiters: HATP-36b, HATP-56b, and WASP-52b". Monthly Notices of the Royal Astronomical Society. 509 (4): 5102–5116. arXiv:2111.05220. doi:10.1093/mnras/stab3270.
  4. ↑ Mancini, L.; et al. (2015). "The GAPS Programme with HARPS-N at TNG. VIII. Observations of the Rossiter-McLaughlin effect and characterisation of the transiting planetary systems HAT-P-36 and WASP-11/HAT-P-10". Astronomy and Astrophysics. 579: A136. arXiv:1503.01787. Bibcode:2015A&A...579A.136M. doi:10.1051/0004-6361/201526030.
  5. 1 2 3 Wang, Weilong; Gu, Shenghong; Wang, Xiaobin; Sun, Leilei; Lee, Byeong-Cheol; Kwok, Chi-Tai; Hui, Ho-Keung; Dou, Jiangpei; Xiang, Yue; Cao, Dongtao; Xu, Fukun (June 2025). "Observations and Studies on the Transiting Systems HAT-P-36, XO-2 and WASP-76". The Astronomical Journal. 169 (6): 342. Bibcode:2025AJ....169..342W. doi:10.3847/1538-3881/add1de. ISSN 0004-6256.
  6. 1 2 3 Biazzo, K.; D’Orazi, V.; Desidera, S.; Turrini, D.; Benatti, S.; Gratton, R.; Magrini, L.; Sozzetti, A.; Baratella, M.; Bonomo, A. S.; Borsa, F.; Claudi, R.; Covino, E.; Damasso, M.; Mauro, M. P. Di (2022-08-01). "The GAPS Programme at TNG - XXXV. Fundamental properties of transiting exoplanet host stars". Astronomy & Astrophysics. 664: A161. arXiv:2205.15796. Bibcode:2022A&A...664A.161B. doi:10.1051/0004-6361/202243467. ISSN 0004-6361.
  7. ↑ Tejada Arevalo, Roberto A.; Winn, Joshua N.; Anderson, Kassandra R. (2021). "Further Evidence for Tidal Spin-up of Hot Jupiter Host Stars". The Astrophysical Journal. 919 (2): 138. arXiv:2107.05759. Bibcode:2021ApJ...919..138T. doi:10.3847/1538-4357/ac1429.
  8. 1 2 Bakos, G. Á.; Hartman, J. D.; Torres, G.; Béky, B.; Latham, D. W.; Buchhave, L. A.; Csubry, Z.; Kovács, G.; Bieryla, A.; Quinn, S.; Szklenár, T.; Esquerdo, G. A.; Shporer, A.; Noyes, R. W.; Fischer, D. A.; Johnson, J. A.; Howard, A. W.; Marcy, G. W.; Sato, B.; Penev, K.; Everett, M.; Sasselov, D. D.; Fűrész, G.; Stefanik, R. P.; Lázár, J.; Papp, I.; Sári, P. (2012). "HAT-P-34b-HAT-P-37b: Four Transiting Planets More Massive than Jupiter Orbiting Moderately Bright Stars". The Astronomical Journal. 144 (1): 19. arXiv:1201.0659. Bibcode:2012AJ....144...19B. doi:10.1088/0004-6256/144/1/19.
  9. ↑ "HAT-P-36". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-02-23.
  10. ↑ "IAU100 NameExoWorlds Approved Names" (PDF). NameExoWorlds. International Astronomical Union. Retrieved 24 July 2020.
  11. 1 2 "HAT-P-36". Open Exoplanet Catalogue. Retrieved 24 July 2020.
  12. ↑ Smith, Niall (29 September 2019). "Sky Matters: Ireland has the chance to name a star and a planet - any ideas?". Irish Examiner. Retrieved 24 July 2020.
  13. ↑ "TYC 3020-2195-1". Centre de Données astronomiques de Strasbourg. SIMBAD. Retrieved 24 July 2020.
  14. ↑ Gorey, Colm (18 December 2019). "Cork teacher names exoplanet and star after Irish mythical dogs". Silicon Republic. Retrieved 24 July 2020.
  15. ↑ Yalçınkaya, S.; Baştürk, Ö.; ElHelweh, F.; Esmer, E.M.; Yörükoğlu, O.; Yılmaz, M.; Şenavcı, H.V.; Kılıçoğlu, T.; Selam, S.O. (2021). "Analysis of the Most Precise Light Curves of HAT-P-36 Detrended from Spot Signals". Acta Astronomica. 71 (3): 223. arXiv:2111.11531. Bibcode:2021AcA....71..223Y. doi:10.32023/0001-5237/71.3.3. S2CID 244488216.