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

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

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


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 TYC8003-1117-1 (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 ms-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.

Original languageEnglish (US)
Pages (from-to)973-985
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
StatePublished - Mar 1 2020

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Planetary systems
  • Planets and satellites: fundamental parameters
  • Techniques: photometric
  • Techniques: radial velocities


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