TOI-1296b and TOI-1298b observed with TESS and SOPHIE: Two hot Saturn-mass exoplanets with different densities around metal-rich stars
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aa41151-21.pdf
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Published version
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5.22 MB
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Author(s)
Seager, Sara
Date Issued
2021
Journal
Astronomy and Astrophysics
Publisher
EDP Sciences
Citation
Seager, Sara. 2021. "TOI-1296b and TOI-1298b observed with TESS and SOPHIE: Two hot Saturn-mass exoplanets with different densities around metal-rich stars." Astronomy and Astrophysics, 653.
Version
Final published version
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%.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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Creative Commons Attribution 4.0 International license
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DOI of Published Version
https://doi.org/10.1051/0004-6361/202141151
