We report the discovery of TOI-3493 b, a sub-Neptune-sized planet on an 8.15-d orbit transiting the bright (V=9.3) G0 star HD 119355 (aka TIC 203377303) initially identified by NASA's TESS space mission. With the aim of confirming the planetary nature of the transit signal detected by TESS and determining the mass of the planet, we performed an intensive Doppler campaign with the HARPS spectrograph, collecting radial velocity measurements. We found that TOI-3493 b lies in a nearly circular orbit and has a mass of 9.0+/-1.2 M_earth and a radius of 3.22+/-0.08 R_earth, implying a bulk density of 1.47+/-0.23 g/cm^3, consistent with a composition comprising a small solid core surrounded by a thick H/He dominated atmosphere.
@article{arxiv.2504.12884,
title = {TOI-3493 b: A planet with a Neptune-like density transiting a bright G0-type star},
author = {P. Chaturvedi and E. Goffo and D. Gandolfi and C. M. Persson and A. P. Hatzes and G. Nowak and A. Bonfanti and A. Bieryla and W. D. Cochran and K. A. Collins and S. B. Fajardo-Acosta and S. B. Howell and J. M. Jenkins and J. Korth and J. Livingston and E. Palle and S. N. Quinn and R. P. Schwarz and S. Seager and A. Shporer and K. G. Stassun and S. Striegel and V. Van Eylen and C. N. Watkins and J. N. Winn and C. Ziegler},
journal= {arXiv preprint arXiv:2504.12884},
year = {2025}
}
Comments
17 pages, 13 figures, to be published in Astronomy and Astrophysics