Document Type
Article
Publication Date
3-20-2020
Published In
Monthly Notices Of The Royal Astronomical Society
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.
Keywords
techniques: photometric, techniques: radial velocities, planets and satellites: fundamental parameters, planetary systems
Recommended Citation
M. R. Díaz, J. S. Jenkins, D. Gandolfi, E. D. Lopez, M. G. Soto, P. Cortés-Zuleta, Z. M. Berdiñas, K. G. Stassun, K. A. Collins, J. I. Vines, C. Ziegler, M. Fridlund, Eric L.N. Jensen, F. Murgas, A. Santerne, P. A. Wilson, M. Esposito, A. P. Hatzes, M. C. Johnson, K. W. F. Lam, J. H. Livingston, V. Van Eylen, N. Narita, C. Briceño, K. I. Collins, S. Csizmadia, M. Fausnaugh, T. Gan, R. A. García, I. Georgieva, A. Glidden, L. González-Cuesta, J. M. Jenkins, D. W. Latham, N. M. Law, A. W. Mann, S. Mathur, I. Mireles, R. Morris, E. Pallé, C. M. Persson, G. Ricker, S. Rinehart, M. E. Rose, S. Seager, J. C. Smith, T.-G. Tan, A. Tokovinin, A. Vanderburg, R. Vanderspek, J. N. Winn, and D. A. Yahalomi.
(2020).
"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.
Volume 493,
Issue 1.
973-985.
DOI: 10.1093/mnras/staa277
https://works.swarthmore.edu/fac-physics/392
Comments
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.