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TOI-3493 b : A planet with a Neptune-like density transiting a bright G0-type star

Chaturvedi, P. ; Goffo, E. ; Gandolfi, D. ; Persson, C. M. ; Hatzes, A. P. ; Nowak, G. ; Bonfanti, A. ; Bieryla, A. ; Cochran, W. D. and Collins, K. A. , et al. (2025) In Astronomy and Astrophysics 697.
Abstract

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⊕ and a radius of 3.22 ± 0.08 R⊕, implying a bulk density of 1.47-0.22+0.23 g cm-3, consistent with a composition comprising a small solid core surrounded by a... (More)

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⊕ and a radius of 3.22 ± 0.08 R⊕, implying a bulk density of 1.47-0.22+0.23 g cm-3, consistent with a composition comprising a small solid core surrounded by a thick H/He-dominated atmosphere.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Planets and satellites: detection, Stars: individual: TOI-3493, Stars: solar-type, Techniques: photometric, Techniques: radial velocities
in
Astronomy and Astrophysics
volume
697
article number
A169
publisher
EDP Sciences
external identifiers
  • scopus:105005656796
ISSN
0004-6361
DOI
10.1051/0004-6361/202453511
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2025 EDP Sciences. All rights reserved.
id
e78922a9-2f17-4db3-945e-088e0a896ad8
date added to LUP
2025-08-11 14:59:32
date last changed
2025-08-11 14:59:32
@article{e78922a9-2f17-4db3-945e-088e0a896ad8,
  abstract     = {{<p>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<sub>⊕</sub> and a radius of 3.22 ± 0.08 R<sub>⊕</sub>, implying a bulk density of 1.47<sub>-0.22</sub><sup>+0.23</sup> g cm<sup>-3</sup>, consistent with a composition comprising a small solid core surrounded by a thick H/He-dominated atmosphere.</p>}},
  author       = {{Chaturvedi, P. and Goffo, E. and Gandolfi, D. and Persson, C. M. and Hatzes, A. P. and Nowak, G. and Bonfanti, A. and Bieryla, A. and Cochran, W. D. and Collins, K. A. and Fajardo-Acosta, S. B. and Howell, S. B. and Jenkins, J. M. and Korth, J. and Livingston, J. and Pallé, E. and Quinn, S. N. and Schwarz, R. P. and Seager, S. and Shporer, A. and Stassun, K. G. and Striegel, S. and Van Eylen, V. and Watkins, C. N. and Winn, J. N. and Ziegler, C.}},
  issn         = {{0004-6361}},
  keywords     = {{Planets and satellites: detection; Stars: individual: TOI-3493; Stars: solar-type; Techniques: photometric; Techniques: radial velocities}},
  language     = {{eng}},
  month        = {{05}},
  publisher    = {{EDP Sciences}},
  series       = {{Astronomy and Astrophysics}},
  title        = {{TOI-3493 b : A planet with a Neptune-like density transiting a bright G0-type star}},
  url          = {{http://dx.doi.org/10.1051/0004-6361/202453511}},
  doi          = {{10.1051/0004-6361/202453511}},
  volume       = {{697}},
  year         = {{2025}},
}