@article{041f82acf3f24db3b948a63236aaaff7,
title = "TOI-1296b and TOI-1298b observed with TESS and SOPHIE: Two hot Saturn-mass exoplanets with different densities around metal-rich stars",
abstract = "We present the discovery of two new transiting extrasolar planet candidates identified as TOI-1296.01 and TOI-1298.01 by the Transiting Exoplanet Survey Satellite (TESS). The planetary nature of these candidates has been secured with the SOPHIE high-precision spectrograph through the measurement of the companion's mass with the radial velocity method. Both planets are similar to Saturn in mass and have similar orbital periods of a few days. They, however, show discrepant radii and therefore different densities. The radius discrepancy might be explained by the different levels of irradiation by the host stars. The subgiant star TOI-1296 hosts a low-density planet with 1.2 RJup while the less luminous, lower-size star TOI-1298 hosts a much denser planet with a 0.84 RJup radius, resulting in bulk densities of 0.198 and 0.743 g cm-3, respectively.In addition, both stars are strongly enriched in heavy elements, having metallicities of +0.44 and +0.49 dex, respectively. The planet masses and orbital periods are 0.298 ± 0.039 MJup and 3.9443715 ± 5.8 ± 10-6 days for TOI-1296b, and 0.356 ± 0.032 MJup and 4.537164 ± 1.2 ± 10-5 days for TOI-1298b. The mass measurements have a relative precision of better than 13%.",
keywords = "Methods: observational, Planetary systems, Planets and satellites: gaseous planets, Techniques: photometric, Techniques: radial velocities",
author = "C. Moutou and Almenara, {J. M.} and G. H{\'e}brard and Santos, {N. C.} and Stassun, {K. G.} and S. Deheuvels and S. Barros and P. Benni and A. Bieryla and I. Boisse and X. Bonfils and Boyd, {P. T.} and Collins, {K. A.} and D. Baker and P. Cort{\'e}s-Zuleta and S. Dalal and F. Debras and M. Deleuil and X. Delfosse and O. Demangeon and Z. Essack and T. Forveille and E. Girardin and P. Guerra and N. Heidari and K. Hesse and S. Hoyer and Jenkins, {J. M.} and F. Kiefer and K{\"o}nig, {P. C.} and D. Laloum and D. Latham and T. Lopez and E. Martioli and Osborn, {H. P.} and G. Ricker and S. Seager and R. Vanderspek and M. Vezie and J. Villase{\~n}or and J. Winn and B. Wohler and C. Ziegler",
note = "Funding Information: Acknowledgements. We are grateful to the anonymous referee who provided very useful criticism and suggestions. Funding for the TESS mission is provided by NASA{\textquoteright}s Science Mission Directorate. We acknowledge the use of public TESS data from pipelines at the TESS Science Office and at the TESS Science Processing Operations Center. Resources supporting this work were provided by the NASA High-End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center for the production of the SPOC data products. This paper includes data collected by the TESS mission that are publicly available from the Mikulski Archive for Space Telescopes (MAST). We acknowledge funding from the French National Research Agency (ANR) under contract number ANR-18-CE31-0019 (SPlaSH). SH acknowledges CNES funding through the grant 837319. This work was also supported by FCT – Funda{\c c}{\~a}o para a Ci{\^e}ncia e a Tecnologia through national funds and by FEDER through COMPETE2020 – Programa Operacional Competitividade e Internacionaliza{\c c}{\~a}o by these grants: UID/FIS/04434/2019; UIDB/04434/2020; UIDP/04434/2020; PTDC/FIS-AST/32113/2017 & POCI-01-0145-FEDER-032113; PTDC/FIS-AST/28953/2017 & POCI-01-0145-FEDER-028953; PTDC/FIS-AST/28987/2017 & POCI-01-0145-FEDER-028987. PC thanks the LSSTC Data Science Fellowship Program, which is funded by LSSTC, NSF Cybertraining Grant #1829740, the Brinson Foundation, and the Moore Foundation; her participation in the program has benefited this work. This work has been carried out within the framework of the NCCR PlanetS supported by the Swiss National Science Foundation. Finally, we thank J. Lissauer for his interest and advice. Publisher Copyright: {\textcopyright} C. Moutou et al. 2021.",
year = "2021",
month = sep,
day = "1",
doi = "10.1051/0004-6361/202141151",
language = "English (US)",
volume = "653",
journal = "Astronomy and Astrophysics",
issn = "0004-6361",
publisher = "EDP Sciences",
}