HAT-P-12b

HAT-P-12b / Puli
Size comparison of HAT-P-12b with Jupiter.
Discovery[1]
Discovered byHartman et al.
Discovery siteCambridge, Massachusetts
Discovery dateApril 29, 2009
Transit
Designations
Puli[2]
Orbital characteristics
0.0384 ± 0.0003 AU (5,745,000 ± 45,000 km)[1]
Eccentricity0 (assumed)[1]
3.2130598 ± 0.0000021[1] d
Inclination89.0 ± 0.4[1]
StarHAT-P-12
Physical characteristics
0.959 ± 0.029[1] RJ
Mass0.211 ± 0.012[1] MJ
Mean density
0.295 ± 0.025 g/cm3[1]

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]

Comparison of "hot Jupiter" exoplanets (artist concept).
From top left to lower right: WASP-12b, WASP-6b, WASP-31b, WASP-39b, HD 189733b, HAT-P-12b, WASP-17b, WASP-19b, HAT-P-1b and HD 209458b.
  1. ^ a b c d e f g h i Cite error: The named reference Hartman2009 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference NEW2022 was invoked but never defined (see the help page).
  3. ^ 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.
  4. ^ 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
  5. ^ 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.
  6. ^ 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
  7. ^ "List of ExoWorlds 2022". nameexoworlds.iau.org. IAU. 8 August 2022. Retrieved 27 August 2022.