TOI-3493 b: A Planet With A Neptune-like Density Transiting A Bright G0-type Star

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 radialvelocity measurements.

We found that TOI-3493 b lies in a nearly circular orbit and has a mass of 9.0 ± 1.2 M_⊕ and a radius of 3.22 ± 0.08 R_⊕,implying a bulk density of 1.47+0.23−0.22 g cm⁻³, consistent with a composition comprising a small solid core surrounded by a thick H/He-dominated atmosphere.

P. Chaturvedi, E. Goffo, D. Gandolfi, C.M. Persson, A.P. Hatzes, G. Nowak, A. Bonfanti, A. Bieryla, W.D.Cochran, K. A. Collins, S.B. Fajardo-Acosta, S.B. Howell, J.M. Jenkins, J. Korth, J. Livingston, E. Palle, S.N. Quinn, R. P. Schwarz, S. Seager, A. Shporer, K.G. Stassun, S. Striegel, V. Van Eylen, C.N. Watkins, J.N. Winn, C. Ziegler

Comments: 17 pages, 13 figures, to be published in Astronomy and Astrophysics
Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:2504.12884 [astro-ph.EP] (or arXiv:2504.12884v1 [astro-ph.EP] for this version)
https://doi.org/10.48550/arXiv.2504.12884
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Submission history
From: Priyanka Chaturvedi Dr
[v1] Thu, 17 Apr 2025 12:20:27 UTC (9,051 KB)
https://arxiv.org/abs/2504.12884
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