Exoplanets & Exomoons

TOI-1736 and TOI-2141: Two Systems Including Sub-Neptunes Around Solar Analogs Revealed By TESS And SOPHIE

By Keith Cowing
Status Report
November 15, 2023
Filed under , , , , , , , , , , , , ,
TOI-1736 and TOI-2141: Two Systems Including Sub-Neptunes Around Solar Analogs Revealed By TESS And SOPHIE
Mass-radius diagram. The green circles show the exoplanet data from exoplanets.eu, the black stars show the Solar System planets and the blue and orange points show the measured values for TOI-1736 b and TOI-2141 b, respectively. Several models from Zeng et al. (2019) are also plotted for comparison. — astro-ph.EP

Planetary systems around solar analogs inform us about how planets form and evolve in Solar System-like environments. We report the detection and characterization of two planetary systems around the solar analogs TOI-1736 and TOI-2141 using TESS photometry data and spectroscopic data obtained with the SOPHIE instrument on the 1.93 m telescope at the Observatoire de Haute-Provence (OHP).

We performed a detailed spectroscopic analysis of these systems to obtain the precise radial velocities (RV) and physical properties of their host stars. TOI-1736 and TOI-2141 each host a transiting sub-Neptune with radii of 2.44±0.18 R⊕ and 3.05±0.23 R⊕, orbital periods of 7.073088(7) d and 18.26157(6) d, and masses of 12.8±1.8 M⊕ and 24±4 M⊕, respectively.

TOI-1736 shows long-term RV variations that are consistent with a two-planet solution plus a linear trend of −0.177 ms−1d−1. We measured an RV semi-amplitude of 201.1±0.7 ms−1 for the outer companion, TOI-1736 c, implying a projected mass of mcsini=8.09±0.20 MJup. From the GAIA DR3 astrometric excess noise, we constrained the mass of TOI-1736 c at 8.7+1.5−0.6 MJup. This planet is in an orbit of 570.2±0.6 d with an eccentricity of 0.362±0.003 and a semi-major axis of 1.381±0.017 au, where it receives a flux of 0.71±0.08 times the bolometric flux incident on Earth, making it an interesting case of a supergiant planet that has settled into an eccentric orbit in the habitable zone of a solar analog. Our analysis of the mass-radius relation for the transiting sub-Neptunes shows that both TOI-1736 b and TOI-2141 b likely have an Earth-like dense rocky core and a water-rich envelope.

E. Martioli, G. Hébrard, L. de Almeida, N. Heidari, D. Lorenzo-Oliveira, F. Kiefer, J. M. Almenara, A. Bieryla, I. Boisse, X. Bonfils, C. Briceño, K. A. Collins, P. Cortés-Zuleta, S. Dalal, M. Deleuil, X. Delfosse, O. Demangeon, J. D. Eastman, T. ForveilleE. Furlan, S. B. Howell, S. Hoyer, J. M. Jenkins, D. W. Latham, N. Law, A. W. Mann, C. Moutou, N. C. Santos, S. G. Sousa, K. G. Stassun, C. Stockdale, G. Torres, J. D. Twicken, J. N. Winn, C. Ziegler

Comments: Accepted for publication in A&A on October 6, 2023
Subjects: Earth and Planetary Astrophysics (astro-ph.EP)
Cite as: arXiv:2311.07011 [astro-ph.EP] (or arXiv:2311.07011v1 [astro-ph.EP] for this version)
Related DOI:
Focus to learn more
Submission history
From: Eder Martioli
[v1] Mon, 13 Nov 2023 01:45:41 UTC (38,700 KB)

Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp veteran, (he/him) 🖖🏻