NGTS-33b: a young super-Jupiter hosted by a fast-rotating massive hot star

ABSTRACT In the last few decades, planet search surveys have been focusing on solar-type stars, and only recently the high-mass regimes. This is mostly due to challenges arising from the lack of instrumental precision, and more importantly, the inherent active nature of fast-rotating massive stars. Here, we report NGTS-33b (TOI-6442b), a super-Jupiter planet with mass, radius, and orbital period of 3.6 $\pm$ 0.3 M$_{\rm J}$, 1.64 $\pm$ 0.07 R$_{\rm J}$, and $2.827\,972 \pm 0.000\,001$ d, respectively. The host is a fast-rotating ($0.6654 \pm 0.0006$ d) and hot (T$_{\rm eff}$ = 7437 $\pm$ 72 K) A9V type star, with a mass and radius of 1.60 $\pm$ 0.11 M$_{\odot }$ and 1.47 $\pm$ 0.06 R$_{\odot }$, respectively. Planet structure and gyrochronology models show that NGTS-33 is also very young with age limits of 10–50 Myr. In addition, membership analysis points towards the star being part of the Vela OB2 association, which has an age of $\sim$ 20–35 Myr, thus providing further evidence about the young nature of NGTS-33. Its low bulk density of 0.19$\pm$0.03 g cm$^{-3}$ is 13 per cent smaller than expected when compared to transiting hot Jupiters (HJs) with similar masses. Such cannot be solely explained by its age, where an up to 15 per cent inflated atmosphere is expected from planet structure models. Finally, we found that its emission spectroscopy metric is similar to JWST community targets, making the planet an interesting target for atmospheric follow-up. Therefore, NGTS-33b’s discovery will not only add to the scarce population of young, massive and HJs, but will also help place further strong constraints on current formation and evolution models for such planetary systems.

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Journal
Monthly Notices of the Royal Astronomical Society
Published
2024-11-19
DOI
https://doi.org/10.1093/mnras/stae2582
Citations
3
Primary Topic
Stellar, planetary, and galactic studies
Type
article
Field-Weighted Citation Impact
0.99

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article

NGTS-33b: a young super-Jupiter hosted by a fast-rotating massive hot star

Maximiliano Moyano, F. Bouchy, A. M. S. Smith, J. McCormac et al.
3 citations
Monthly Notices of the Royal Astronomical Society
Stellar, planetary, and galactic studies
0.99
article

NGTS-33b: a young super-Jupiter hosted by a fast-rotating massive hot star

Maximiliano Moyano, F. Bouchy, A. M. S. Smith, J. McCormac, M. R. Burleigh, Léna Parc, M. Lendl, M. R. Goad, Alicia Kendall, S. L. Casewell, Samuel Gill, J. S. Jenkins, Gavin Ramsay, P. J. Wheatley, Ares Osborn, Faith Hawthorn, Louise D. Nielsen, José I Vines, D. R. Anderson, Suman Saha, Matthew P. Battley, S. Udry, Ioannis Apergis, A. Nigioni, D. R. Alves
article en
3 citations

Abstract

ABSTRACT In the last few decades, planet search surveys have been focusing on solar-type stars, and only recently the high-mass regimes. This is mostly due to challenges arising from the lack of instrumental precision, and more importantly, the inherent active nature of fast-rotating massive stars. Here, we report NGTS-33b (TOI-6442b), a super-Jupiter planet with mass, radius, and orbital period of 3.6 $\pm$ 0.3 M$_{\rm J}$, 1.64 $\pm$ 0.07 R$_{\rm J}$, and $2.827\,972 \pm 0.000\,001$ d, respectively. The host is a fast-rotating ($0.6654 \pm 0.0006$ d) and hot (T$_{\rm eff}$ = 7437 $\pm$ 72 K) A9V type star, with a mass and radius of 1.60 $\pm$ 0.11 M$_{\odot }$ and 1.47 $\pm$ 0.06 R$_{\odot }$, respectively. Planet structure and gyrochronology models show that NGTS-33 is also very young with age limits of 10–50 Myr. In addition, membership analysis points towards the star being part of the Vela OB2 association, which has an age of $\sim$ 20–35 Myr, thus providing further evidence about the young nature of NGTS-33. Its low bulk density of 0.19$\pm$0.03 g cm$^{-3}$ is 13 per cent smaller than expected when compared to transiting hot Jupiters (HJs) with similar masses. Such cannot be solely explained by its age, where an up to 15 per cent inflated atmosphere is expected from planet structure models. Finally, we found that its emission spectroscopy metric is similar to JWST community targets, making the planet an interesting target for atmospheric follow-up. Therefore, NGTS-33b’s discovery will not only add to the scarce population of young, massive and HJs, but will also help place further strong constraints on current formation and evolution models for such planetary systems.

Monthly Notices of the Royal Astronomical SocietyVol. 536(2)
University of Geneva (CH), University of Leicester (GB), Armagh Observatory & Planetarium (GB), Universidad Católica del Norte (CL), Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR) (DE), University of Warwick (GB), Millennium Institute of Astrophysics (CL), Centro de Astrofísica y Tecnologías Afines (CL), University of Chile (CL), Ludwig-Maximilians-Universität München (DE), Universidad Diego Portales (CL), McMaster University (CA)
Science and Technology Facilities Council
Openalex Percentile: Top 22%
Stellar, planetary, and galactic studies
0.99
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