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

Díaz, Matías R.; Jenkins, James S.; Gandolfi, Davide; Lopez, Eric D.; Soto, Maritza G.; Cortés-Zuleta, Pía; Berdiñas, Zaira M.; Stassun, Keivan G.; Collins, Karen A.; Vines, José I.; Ziegler, Carl; Fridlund, Malcom; Jensen, Eric L. N.; Murgas, Felipe; Santerne, Alexandre; Wilson, Paul A.; Esposito, Massimiliano; Hatzes, Artie P.; Johnson, Marshall C.; Lam, Kristine W. F.; Livingston, John H.; Van Eylen, Vincent; Narita, Norio; Briceño, Cesar; Collins, Kevin I.; Csizmadia, Szilárd; Fausnaugh, Michael; Gan, Tianjun; García, Rafael A.; Georgieva, Iska; Glidden, Ana; González-Cuesta, Lucía; Jenkins, Jon M.; Latham, David W.; Law, Nicholas M.; Mann, Andrew W.; Mathur, Savita; Mireles, Ismael; Morris, Robert; Pallé, Enric; Persson, Carina M.; Ricker, George; Rinehart, Stephen; Rose, Mark E.; Seager, Sara; Smith, Jeffrey C.; Tan, Thiam-Guan; Tokovinin, Andrei; Vanderburg, Andrew; Vanderspek, Roland; Winn, Joshua N.; Yahalomi, Daniel A.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society

Advertised on:
3
2020
Number of authors
52
IAC number of authors
5
Citations
21
Refereed citations
19
Description
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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