TOI-1736 and TOI-2141: Two systems including sub-Neptunes around solar analogs revealed by TESS and SOPHIE
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Published:2023-12
Issue:
Volume:680
Page:A84
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ISSN:0004-6361
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Container-title:Astronomy & Astrophysics
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language:
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Short-container-title:A&A
Author:
Martioli E.ORCID, Hébrard G., de Almeida L.ORCID, Heidari N., Lorenzo-Oliveira D., Kiefer F., Almenara J. M., Bieryla A., Boisse I., Bonfils X., Briceño C., Collins K. A., Cortés-Zuleta P., Dalal S., Deleuil M., Delfosse X., Demangeon O., Eastman J. D., Forveille T., Furlan E., Howell S. B., Hoyer S., Jenkins J. M., Latham D. W., Law N., Mann A. W., Moutou C., Santos N. C., Sousa S. G., Stassun K. G., Stockdale C., Torres G., Twicken J. D., Winn J. N., Ziegler C.
Abstract
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) days and 18.26157(6) days, 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 m s−1 day−1. We measured an RV semi-amplitude of 201.1 ± 0.7 m s−1 for the outer companion, TOI-1736 c, implying aprojected mass of mcsin i = 8.09 ± 0.20 MJup. From the Gaia DR3 astrometric excess noise, we constrained the mass of TOI-1736 c at 8.7−0.6+1.5 MJup. This planet is in an orbit of 570.2 ± 0.6 days 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.
Funder
Fundação de Amparo à Pesquisa do Estado de Minas Gerais - FAPEMIG, Brazil National Council for Scientific and Technological Development - CNPq, Brazil National Research Agency - ANR, France
Subject
Space and Planetary Science,Astronomy and Astrophysics
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