HAT-P-36

HAT-P-36, also referred to as Tuiren[4] is a 12th magnitude G-type main-sequence star estimated to be approximately 958 light-years away from Earth[2] 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.[5] 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.[6] Bran has a mass approximately 1.8 times that of Jupiter and a radius 1.2 times larger.

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 J2000.0
Constellation Canes Venatici[1]
Right ascension 12h 33m 03.9061s[2]
Declination +44° 54′ 55.196″[2]
Apparent magnitude (V) 12.26
Characteristics
Spectral type G
Astrometry
Radial velocity (Rv)−16.434 km/s
Proper motion (μ) RA: −11.622(8) mas/yr[2]
Dec.: 8.138(10) mas/yr[2]
Parallax (π)3.4055 ± 0.0110 mas[2]
Distance958 ± 3 ly
(293.6 ± 0.9 pc)
Details
Mass1.022 ± 0.049 M☉
Radius1.096 ± 0.056 R☉
Temperature5580 ± 100.0 K
Metallicity [Fe/H]0.26 ± 0.08 dex
Age6.6 ± 1.8 Gyr
Other designations
Tuiren, Gaia DR3 1541532207133249920, TYC 3020-2221-1, 2MASS J12330390+4454552[3]
Database references
SIMBADdata

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.[7]

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.[8]

Planets
The HAT-P-36b planetary system[9]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b (Bran) ≥1.832±0.099 MJ 0.0238±0.0004 1.327347±0.000003 0.063±0.032 86±1.3° 1.264±0.071 RJ

HAT-P-36b (Bran) was discovered in 2012 by the HATNet Project using the transit method.[5] A search for transit timing variation did not result in detection of additional planets in the system as at 2021.[10] Surprisingly, a planetary orbital period increase by 0.014 seconds per year was detected by 2021.[11]

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): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Vizier query form
  2. 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. "HAT-P-36". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-02-23.
  4. "IAU100 NameExoWorlds Approved Names" (PDF). NameExoWorlds. International Astronomical Union. Retrieved 24 July 2020.
  5. "HAT-P-36". Open Exoplanet Catalogue. Retrieved 24 July 2020.
  6. 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.
  7. "TYC 3020-2195-1". Centre de Données astronomiques de Strasbourg. SIMBAD. Retrieved 24 July 2020.
  8. Gorey, Colm (18 December 2019). "Cork teacher names exoplanet and star after Irish mythical dogs". Silicon Republic. Retrieved 24 July 2020.
  9. "Planet HAT-P-36 b". Extrasolar Planets Encyclopaedia. Retrieved 24 July 2020.
  10. 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
  11. 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), arXiv:2111.11531, doi:10.32023/0001-5237/71.3.3, S2CID 244488216
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