HAT-P-12b

HAT-P-12b / Puli
	Size comparison of HAT-P-12b with Jupiter.
Discovery
Discovered by	Hartman et al.
Discovery site	Cambridge, Massachusetts
Discovery date	April 29, 2009
Detection method	Transit
Designations
Alternative names	Puli
Orbital characteristics
Semi-major axis	0.0384 ± 0.0003 AU (5,745,000 ± 45,000 km)
Eccentricity	0 (assumed)
Orbital period (sidereal)	3.2130598 ± 0.0000021 d
Inclination	89.0 ± 0.4
Star	HAT-P-12
Physical characteristics
Mean radius	0.959 ± 0.029 RJ
Mass	0.211 ± 0.012 MJ
Mean density	0.295 ± 0.025 g/cm3

HAT-P-12b, formally named Puli,^[2] is an extrasolar planet approximately 468 light years away from Earth, orbiting the 13th magnitude K-type star HAT-P-12, which is located in Canes Venatici constellation. It is a transiting hot Jupiter that was discovered by the HATNet Project on April 29, 2009.

HAT-P-12b is a H/He-dominated gas giant planet with a core mass of 11.3^+2.6
_−2.1 M_🜨 and is moderately irradiated by its low-metallicity host star.^[3] Therefore, HAT-P-12b is most likely an H/He-dominated planet with a core of perhaps ~10 M_🜨, and a total metal fraction of ~15%. This makes HAT-P-12b the least massive H/He-dominated gas giant planet found to date; the previous record holder was Saturn.^[1]

In 2020, the obtained transmission spectra have revealed that the atmosphere of HAT-P-12b is cloudy,^[4] with haze above cloud tops. Water was detected.^[5] The prevalence of clouds and hazes in planetary atmosphere was disputed in 2021 though.^[6]

In August 2022, this planet and its host star were included among 20 systems to be named by the third NameExoWorlds project.^[7] The approved names, proposed by a team from Hungary, were announced in June 2023. HAT-P-12b is named Puli and its host star is named Komondor, after the Hungarian Puli and Komondor dog breeds.^[2]

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Hartman, J. D.; et al. (2009). "HAT-P-12b: A Low-density sub-Saturn mass planet transiting a metal-poor K dwarf". The Astrophysical Journal. 706 (1): 785–796. arXiv:0904.4704. Bibcode:2009ApJ...706..785H. doi:10.1088/0004-637X/706/1/785. S2CID 14540643.
^ ^a ^b ^c "2022 Approved Names". nameexoworlds.iau.org. IAU. Retrieved 7 June 2023.
^ Lee, Jae Woo; Youn, Jae-Hyuck; Kim, Seung-Lee; Lee, Chung-Uk; Hinse, Tobias Cornelius (2012). "THE SUB-SATURN MASS TRANSITING PLANET HAT-P-12b". The Astronomical Journal. 143 (4): 95. arXiv:1201.6419. Bibcode:2012AJ....143...95L. doi:10.1088/0004-6256/143/4/95. S2CID 118610109.
^ Yan, F.; Espinoza, N.; Molaverdikhani, K.; Henning, Th.; Mancini, L.; Mallonn, M.; Rackham, B. V.; Apai, D.; Jordán, A.; Mollière, P.; Chen, G.; Carone, L.; Reiners, Ansgar (2020), "LBT transmission spectroscopy of HAT-P-12b: confirmation of a cloudy atmosphere with no significant alkali features", Astronomy & Astrophysics, A98: 642, arXiv:2007.15485, Bibcode:2020A&A...642A..98Y, doi:10.1051/0004-6361/201937265, S2CID 220870755
^ Wong, Ian; Benneke, Björn; Gao, Peter; Knutson, Heather A.; Chachan, Yayaati; Henry, Gregory W.; Deming, Drake; Kataria, Tiffany; Lee, Graham K. H.; Nikolov, Nikolay; Sing, David K.; Ballester, Gilda E.; Baskin, Nathaniel J.; Wakeford, Hannah R.; Williamson, Michael H. (2020). "Optical to near-infrared transmission spectrum of the warm sub-Saturn HAT-P-12b". The Astronomical Journal. 159 (5): 234. arXiv:2004.03551. Bibcode:2020AJ....159..234W. doi:10.3847/1538-3881/ab880d. S2CID 215238620.
^ Jiang, C.; Chen, G.; Pallé, E.; Murgas, F.; Parviainen, H.; Yan, F.; Ma, Y. (2021), "Evidence for stellar contamination in the transmission spectra of HAT-P-12b", Astronomy & Astrophysics, 656: A114, arXiv:2109.11235, Bibcode:2021A&A...656A.114J, doi:10.1051/0004-6361/202141824, S2CID 237604976
^ "List of ExoWorlds 2022". nameexoworlds.iau.org. IAU. 8 August 2022. Retrieved 27 August 2022.