[astro-ph.EP]. Understanding how planetary demographics depend on host star properties is essential for constraining planet formation and evolution theories.
In this paper, we analyse close-in 0.5-16 d planet occurrence rates from the TESS Science Processing Operations Center (SPOC) full-frame image data for individual F-, G-, and K-type main-sequence stellar samples.
Integrated over 0.5<P<16 d and 2<Rp<20R⊕, the occurrence rates are 12.1+3.0−2.3, 10.2+1.2−1.0, and 13.1+1.4−1.2 planets per 100 stars for F-, G-, and K-type hosts, consistent with each other at 1σ, so any spectral-type dependence is localized rather than global.
For transiting hot Jupiters, we measure 0.30+0.04−0.03, 0.50±0.03, and 0.67+0.08−0.07 per cent, with the rate peaking at K type; the latter being the first such measurement for K-type hosts. Modelling the Neptunian desert directly in occurrence-rate space, we find that the desert extends to longer orbital periods around hotter stars.
Integrating over the desert interior gives 0.069+0.045−0.011, 0.093+0.046−0.022, and 0.150+0.033−0.026 planets per 100 stars, implying about one close-in planet in a hundred lies inside the desert, and the desert is roughly twice as populated around K- as around F-type hosts. A rigorous Bayesian model comparison for the 6-8R⊕ strip indicates that a distinct Neptunian ridge is not required to explain the measurements.
Kaiming Cui, David J. Armstrong, Andreas Hadjigeorghiou, Marina Lafarga, Ares Osborn, George W. King, Tim Hallatt, Vedad Kunovac, Lauren Doyle
Comments: 21 pages, 17 figures, 10 tables, accepted for publication in MNRAS. Online interactive TESS occurrence rate: this https URL
Subjects: Earth and Planetary Astrophysics (astro-ph.EP)
Cite as: arXiv:2610.31784 [astro-ph.EP] (or arXiv:2610.31784v1 [astro-ph.EP] for this version)
https://doi.org/10.48550/arXiv.2610.31784
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Related DOI:
https://doi.org/10.1093/mnras/stag2018
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Submission history
From: Kaiming Cui
[v1] Thu, 22 Oct 2026 18:20:30 UTC (5,027 KB)
https://arxiv.org/abs/2610.31784
Astrobiology, exoplanet,
