# HIP 67522 b

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Exoplanet

HIP 67522 b Discovery[1] Discovered by THYME (Rizzuto et al.) Discovery date 2020 Detection method Primary Transit Designations Alternative names HD 120411 b, Gaia DR2 6113920619134019456 b, TYC 7794-2268-1 b[2] Orbital characteristics Eccentricity 0.059+0.193 −0.046[3] Orbital period (sidereal) 6.959503±0.000016 d[3] Inclination 89.34°+0.45° −0.54° (to plane of sky)[1] 5.8+2.8 −5.7 ° (to host star's equator, projected)[4] Argument of periastron 343.0+92.0 −140.0 °[3] Star HIP 67522 Physical characteristics Mean radius 0.897±0.051 RJ[3] Mass 13.8 ± 1.0, <20 M🜨[5][6], 29.8 ± 3 M🜨[7] Mean density (uncertain)[7] Temperature 1174±21 K[3]

**HIP 67522 b** is a [hot Neptune](/source/Hot_Neptune) or [sub-Saturn](/source/Sub-Saturn) exoplanet orbiting the [G-type star](/source/G-type_main-sequence_star)[8] [HIP 67522](/source/HIP_67522), approximately 415 [light-years](/source/Light-years) from [Earth](/source/Earth)[8] in the constellation [Centaurus](/source/Centaurus).[6] It was discovered using the [Transiting Exoplanet Survey Satellite](/source/Transiting_Exoplanet_Survey_Satellite) (TESS). It is one of the youngest transiting planets of any type, and one of only four others less than 100 million years old (along with [AU Mic b](/source/AU_Microscopii_b), [V1298 Tau c](/source/V1298_Tauri), [DS Tuc Ab](/source/DS_Tucanae) and [TOI-942 b](https://en.wikipedia.org/w/index.php?title=TOI-942&action=edit&redlink=1)) to have the angle between its orbit and its host star's rotation measured, at 5.8+2.8 −5.7 degrees.[4] This planet, in turn, may help in understanding how other hot Neptunes form.

There is also evidence that another planet might also be present in the planetary system.[1]

## Characteristics and formation

Due to its young age, HIP 67522 b has not reached its final size. Also due to the [Kelvin–Helmholtz mechanism](/source/Kelvin%E2%80%93Helmholtz_mechanism),[4] which occurs as a result of the planet itself cooling, its internal pressure drops, which will in turn cause the planet to shrink. Its final size will depend on the composition of its [core](/source/Planetary_core).[9]

It was shown in 2024 that HIP 67522 b is one of the [least dense](/source/List_of_exoplanet_extremes) known planets, with a density less than 0.10 g/cm3. It might have formed beyond the water-[snowline](/source/Frost_line_(astrophysics)), where the contamination by both rocky and [icy](/source/Ice_giant) materials frequently takes place.[5][6] In 2025, it was revealed with certainty that HIP 67522 b triggers the increase in flare from the host star via the star-planet [magnetic](/source/Magnetism) interactions. These flares might have caused the shrinkage of the planet's atmosphere.[10] In 2026, by using [VLT](/source/Very_Large_Telescope), the presence of [water vapour](/source/Water_vapour) (H2O) and [carbon monoxide](/source/Carbon_monoxide) (CO) in the planet's atmosphere was revealed with high confidence, along with day-to-night [winds](/source/Wind). The mass of planet was measured at 29.8 ± 3 [M🜨](/source/Earth_mass), which is 3σ inconsistent with the previous estimate from [JWST](/source/James_Webb_Space_Telescope). Also a tentative detection of [semiheavy water](/source/Semiheavy_water) (HDO) was reported, which would be the first detection of [deuterium](/source/Deuterium) in exoplanet's atmosphere if confirmed.[7]

## References

1. ^ [***a***](#cite_ref-17M_1-0) [***b***](#cite_ref-17M_1-1) [***c***](#cite_ref-17M_1-2) Rizzuto, A. C.; Newton, E. R.; Mann, A. W.; Tofflemire, B. M.; Vanderburg, A.; Kraus, A. L.; Wood, M. L.; Quinn, S. N.; Zhou, G.; Thao, P. C.; Law, N. M.; Ziegler, C.; Briceño, César (June 22, 2020). ["TESS Hunt for Young and Maturing Exoplanets (THYME). II. A 17 Myr Old Transiting Hot Jupiter in the Sco-Cen Association"](https://doi.org/10.3847%2F1538-3881%2Fab94b7). *The Astronomical Journal*. **160** (1): 33. [arXiv](/source/ArXiv_(identifier)):[2005.00013](https://arxiv.org/abs/2005.00013). [Bibcode](/source/Bibcode_(identifier)):[2020AJ....160...33R](https://ui.adsabs.harvard.edu/abs/2020AJ....160...33R). [doi](/source/Doi_(identifier)):[10.3847/1538-3881/ab94b7](https://doi.org/10.3847%2F1538-3881%2Fab94b7). [S2CID](/source/S2CID_(identifier)) [218470215](https://api.semanticscholar.org/CorpusID:218470215).

1. **[^](#cite_ref-2)** ["HIP 67522"](http://www.openexoplanetcatalogue.com/planet/HIP%2067522%20b/). Open Exoplanet Catalogue. Retrieved January 25, 2022.

1. ^ [***a***](#cite_ref-HIP_3-0) [***b***](#cite_ref-HIP_3-1) [***c***](#cite_ref-HIP_3-2) [***d***](#cite_ref-HIP_3-3) [***e***](#cite_ref-HIP_3-4) ["Planet HIP 67522 b"](https://exoplanet.eu/catalog/hip_67522_b--7401/). *[Extrasolar Planets Encyclopaedia](/source/Extrasolar_Planets_Encyclopaedia)*. 1995. Retrieved January 23, 2022.

1. ^ [***a***](#cite_ref-17Mb_4-0) [***b***](#cite_ref-17Mb_4-1) [***c***](#cite_ref-17Mb_4-2) Heitzmann, A.; Zhou, G.; Quinn, S. N.; Marsden, S. C.; Wright, D.; Petit, P.; Vanderburg, A. M.; Bouma, L. G.; Mann, A. W.; Rizzuto, A. C. (November 12, 2021). ["The Obliquity of HIP 67522 b: A 17 Myr Old Transiting Hot, Jupiter-sized Planet"](https://doi.org/10.3847%2F2041-8213%2Fac3485). *The Astrophysical Journal Letters*. **922** (1): L1. [arXiv](/source/ArXiv_(identifier)):[2109.04174](https://arxiv.org/abs/2109.04174). [Bibcode](/source/Bibcode_(identifier)):[2021ApJ...922L...1H](https://ui.adsabs.harvard.edu/abs/2021ApJ...922L...1H). [doi](/source/Doi_(identifier)):[10.3847/2041-8213/ac3485](https://doi.org/10.3847%2F2041-8213%2Fac3485). [S2CID](/source/S2CID_(identifier)) [237452642](https://api.semanticscholar.org/CorpusID:237452642).

1. ^ [***a***](#cite_ref-ab_5-0) [***b***](#cite_ref-ab_5-1) Cowing, Keith (8 October 2024). ["The Featherweight Giant: Unraveling the Atmosphere of a 17 Myr Planet with JWST"](https://astrobiology.com/2024/10/the-featherweight-giant-unraveling-the-atmosphere-of-a-17-myr-planet-with-jwst.html). *Astrobiology*. Retrieved 11 October 2024.

1. ^ [***a***](#cite_ref-thao_6-0) [***b***](#cite_ref-thao_6-1) [***c***](#cite_ref-thao_6-2) Thao, Pa Chia; Mann, Andrew W.; Feinstein, Adina D.; Gao, Peter; Thorngren, Daniel; Rotman, Yoav; Welbanks, Luis; Brown, Alexander; Duvvuri, Girish M.; France, Kevin; Longo, Isabella; Sandoval, Angeli; Schneider, P. Christian; Wilson, David J.; Youngblood, Allison (2024-12-01). ["The Featherweight Giant: Unraveling the Atmosphere of a 17 Myr Planet with JWST"](https://doi.org/10.3847%2F1538-3881%2Fad81d7). *The Astronomical Journal*. **168** (6): 297. [arXiv](/source/ArXiv_(identifier)):[2409.16355](https://arxiv.org/abs/2409.16355). [Bibcode](/source/Bibcode_(identifier)):[2024AJ....168..297T](https://ui.adsabs.harvard.edu/abs/2024AJ....168..297T). [doi](/source/Doi_(identifier)):[10.3847/1538-3881/ad81d7](https://doi.org/10.3847%2F1538-3881%2Fad81d7). [ISSN](/source/ISSN_(identifier)) [0004-6256](https://search.worldcat.org/issn/0004-6256).

1. ^ [***a***](#cite_ref-Lavail2026_7-0) [***b***](#cite_ref-Lavail2026_7-1) [***c***](#cite_ref-Lavail2026_7-2) Lavail, A.; Debras, F.; Klein, B.; Chabrol, E.; Vinatier, S.; Hood, T.; Masson, A.; Seidel, J. V.; Moutou, C.; Aigrain, S.; Meech, A.; Barragán, O. (2026). "Atmospheric characterization of HIP 67522 b with VLT/CRIRES+. VLT/CRIRES+ suggests a heavier planet and hints at deuterium fractionation". [arXiv](/source/ArXiv_(identifier)):[2602.03498](https://arxiv.org/abs/2602.03498) [[astro-ph.EP](https://arxiv.org/archive/astro-ph.EP)].

1. ^ [***a***](#cite_ref-NASA_8-0) [***b***](#cite_ref-NASA_8-1) ["HIP 67522 b"](https://exoplanets.nasa.gov/exoplanet-catalog/7659/hip-67522-b/). exoplanets.nasa.gov. 24 July 2020. Retrieved January 23, 2022.

1. **[^](#cite_ref-9)** Lopez, E. D.; Fortney, J. J. (September 17, 2013). ["The Role of Core Mass in Controlling Evaporation: The Kepler Radius Distribution and the Kepler-36 Density Dichotomy"](https://iopscience.iop.org/article/10.1088/0004-637X/776/1/2/meta). *The Astrophysical Journal*. **776** (1): 2. [arXiv](/source/ArXiv_(identifier)):[1305.0269](https://arxiv.org/abs/1305.0269). [Bibcode](/source/Bibcode_(identifier)):[2013ApJ...776....2L](https://ui.adsabs.harvard.edu/abs/2013ApJ...776....2L). [doi](/source/Doi_(identifier)):[10.1088/0004-637X/776/1/2](https://doi.org/10.1088%2F0004-637X%2F776%2F1%2F2). [S2CID](/source/S2CID_(identifier)) [118545757](https://api.semanticscholar.org/CorpusID:118545757).

1. **[^](#cite_ref-10)** Ilin, Ekaterina; Vedantham, Harish K.; Poppenhäger, Katja; Bloot, Sanne; Callingham, Joseph R.; Brandeker, Alexis; Chakraborty, Hritam (2025-07-02). ["Close-in planet induces flares on its host star"](https://www.nature.com/articles/s41586-025-09236-z). *Nature*. **643** (8072): 645–648. [arXiv](/source/ArXiv_(identifier)):[2507.00791](https://arxiv.org/abs/2507.00791). [Bibcode](/source/Bibcode_(identifier)):[2025Natur.643..645I](https://ui.adsabs.harvard.edu/abs/2025Natur.643..645I). [doi](/source/Doi_(identifier)):[10.1038/s41586-025-09236-z](https://doi.org/10.1038%2Fs41586-025-09236-z). [ISSN](/source/ISSN_(identifier)) [1476-4687](https://search.worldcat.org/issn/1476-4687). [PMID](/source/PMID_(identifier)) [40604272](https://pubmed.ncbi.nlm.nih.gov/40604272).

v t e Constellation of Centaurus List of stars in Centaurus Centaurus in Chinese astronomy Stars Bayer α A (Rigil Kentaurus) B (Toliman) C (Proxima Centauri) β (Hadar) γ δ ε ζ (Leepwal) η θ (Menkent) ι (Kulou) κ λ μ ν (Heng) ξ1 ξ2 ο1 ο2 π ρ σ τ υ1 υ2 φ χ ψ x1 x2 C3 D E F G H J K M N Q Flamsteed 1 (i) 2 (g) 3 (k) 4 (h) Variable R T V Y RR SV SX BV DY UY V346 V553 V744 V752 V761 (a) V763 (C1) V766 V779 (Krzemiński's star) V803 V810 V816 (Przybylski's Star) V831 V842 V885 V886 V863 V1032 V1369 V1400 V1935 HR 4460 (A) 4466 (C2) 4499 4522 4523 4537 (j) 4546 (B) 4721 4748 (u) 4796 4817 (l) 4831 (w) 4874 (p) 4888 (e) 4889 (n) 4940 (f) 4979 4989 5006 (r) 5041 (m) 5089 (d) 5174 (z) 5222 (y) 5224 5241 5297 5358 (v) 5371 5471 (b) 5485 (c1) 5489 (c2) HD 97413 98176 100453 101581 101930 102117 (Uklun) 103197 107914 108236 109749 110113 113538 113766 114386 114729 115600 116434 (Matza) 117207 117618 (Dofida) 117939 120411 121228 121504 124448 (Popper's Star) 125072 125595 131399 Other 2MASS J1126−5003 2M1207 Gaia BH2 HD 131399 Ab PSR B1259−63 PSR J1311−3430 TOI-763 WASP-15 (Nyamien) WASP-41 WASP-42 WASP-167/KELT-13 Exoplanets 2M1207b b Centauri b HD 101930 b HD 102117 b (Leklsullun) HD 103197 b HD 109749 b HD 113538 b c HD 114386 b HD 114729 b HD 117207 b HD 117618 b (Noifasui) HD 121504 b HIP 65426 b (Najsakopajk) HIP 67522 b NGTS-13b Proxima Centauri b c d WASP-15b (Asye) Star clusters NGC 3766 4230 4507 5281 5286 5316 5460 5617 5662 Other IC 2944 ω Centauri Scorpius–Centaurus association Stock 16 Nebulae NGC 3918 5307 Other Boomerang Nebula Fleming 1 G292.0+1.8 G306.3-0.9 Gum 41 IC 2944 IRAS 13208−6020 RCW 79 RCW 86 Southern Crab Nebula SuWt 2 Galaxies NGC 3557 3568 3749 3783 4444 4603 4622 4650A 4683 4696 4706 4709 4729 4730 4743 4744 4909 4930 4945 4976 5011 A 5026 5064 5082 5090 5091 5102 5114 5121 5128 (Centaurus A) 5161 5206 5253 5266 5291 5398 5408 5419 5483 5516 Other ESO 269-57 ESO 325-4 ESO 383-76 ESO 444-46 Fourcade-Figueroa Object IC 3370 IC 4214 IC 4329A IRAS 13224−3809 J1144−4308 LEDA 677373 PKS 1144−379 PKS 1353−341 PKS 1424−418 Galaxy clusters Abell S740 Centaurus Cluster Shapley Supercluster Astronomical events GW190521 SN 185 SN 1895B (Z) SN 1972E SN 1986G J1407b SN 2019so Category

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Adapted from the Wikipedia article [HIP 67522 b](https://en.wikipedia.org/wiki/HIP_67522_b) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/HIP_67522_b?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.