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TOI-132 b: A short-period planet in the Neptune desert transiting a V = 11.3 G-type star

Abstract : The Neptune desert is a feature seen in the radius-period plane, whereby a notable dearth of short period, Neptune-like planets is found. Here, we report the Transiting Exoplanet Survey Satellite (TESS) discovery of a new short-period planet in the Neptune desert, orbiting the G-type dwarf TYC 8003-1117-1 (TOI-132). TESS photometry shows transit-like dips at the level of ∼1400 ppm occurring every ∼2.11 d. High-precision radial velocity follow-up with High Accuracy Radial Velocity Planet Searcher confirmed the planetary nature of the transit signal and provided a semi-amplitude radial velocity variation of 11.38 $^{+0.84}_{-0.85}$ m s-1, which, when combined with the stellar mass of 0.97 ± 0.06 M, provides a planetary mass of 22.40 $^{+1.90}_{-1.92}$ M. Modelling the TESS light curve returns a planet radius of 3.42 $^{+0.13}_{-0.14}$ R, and therefore the planet bulk density is found to be 3.08 $^{+0.44}_{-0.46}$ g cm-3. Planet structure models suggest that the bulk of the planet mass is in the form of a rocky core, with an atmospheric mass fraction of 4.3 $^{+1.2}_{-2.3}$ per cent. TOI-132 b is a TESS Level 1 Science Requirement candidate, and therefore priority follow-up will allow the search for additional planets in the system, whilst helping to constrain low-mass planet formation and evolution models, particularly valuable for better understanding of the Neptune desert.
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https://hal-insu.archives-ouvertes.fr/insu-03667118
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Submitted on : Friday, May 13, 2022 - 11:26:20 AM
Last modification on : Saturday, June 25, 2022 - 3:17:12 AM

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Matías R. Díaz, James S. Jenkins, Davide Gandolfi, Eric D. Lopez, Maritza G. Soto, et al.. TOI-132 b: A short-period planet in the Neptune desert transiting a V = 11.3 G-type star. Monthly Notices of the Royal Astronomical Society, 2020, 493, pp.973-985. ⟨10.1093/mnras/staa277⟩. ⟨insu-03667118⟩

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