Issue |
A&A
Volume 653, September 2021
|
|
---|---|---|
Article Number | A147 | |
Number of page(s) | 12 | |
Section | Planets and planetary systems | |
DOI | https://doi.org/10.1051/0004-6361/202141151 | |
Published online | 23 September 2021 |
TOI-1296b and TOI-1298b observed with TESS and SOPHIE: two hot Saturn-mass exoplanets with different densities around metal-rich stars★
1
Université de Toulouse, CNRS, IRAP,
14 avenue Belin,
31400
Toulouse,
France
e-mail: claire.moutou@irap.omp.eu
2
Université Grenoble Alpes, CNRS, IPAG,
38000
Grenoble,
France
3
Institut d’Astrophysique de Paris, CNRS, UMR 7095, Sorbonne Université,
98 bis bd Arago,
75014
Paris,
France
4
Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas,
4150-762
Porto,
Portugal
5
Vanderbilt University, Department of Physics & Astronomy,
6301 Stevenson Center Ln.,
Nashville,
TN
37235,
USA
6
Acton Sky Portal (Private Observatory),
Acton,
MA,
USA
7
Center for Astrophysics, Harvard & Smithsonian,
60 Garden Street,
Cambridge,
MA
02138,
USA
8
Aix-Marseille Université, CNRS, CNES, LAM (Laboratoire d’Astrophysique de Marseille),
Marseille,
France
9
Astrophysics Science Division, NASA Goddard Space Flight Center,
Greenbelt,
MD
20771,
USA
10
Physics Department, Austin College,
Sherman,
TX
75090,
USA
11
Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology,
Cambridge,
MA
02139,
USA
12
Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology,
Cambridge,
MA
02139,
USA
13
Grand Pra Observatory,
1984
Les Hauderes,
Switzerland
14
Observatori Astronòmic Albanyà,
Camì de Bassegoda S/N, Albanyà 17733,
Girona,
Spain
15
NASA Ames Research Center,
Moffett Field,
CA,
94035,
USA
16
LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université de Paris,
Meudon,
France
17
SAF, Observatoire Privé du Mont,
40280,
Saint-Pierre-du-Mont,
France
18
NCCR/PlanetS, Centre for Space & Habitability, University of Bern,
Bern,
Switzerland
19
Department of Astrophysical Sciences, Princeton University,
4 Ivy Lane,
Princeton,
NJ
08544,
USA
20
SETI Institute,
Mountain View,
CA
94043,
USA
21
Department of Physics, Engineering and Astronomy, Stephen F. Austin State University,
1936 North St,
Nacogdoches,
TX
75962,
USA
22
Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre,
4169-007
Porto,
Portugal
23
Department of Physics, Shahid Beheshti University,
Tehran,
Iran
24
Laboratoire J.-L. Lagrange, Observatoire de la Côte d’Azur (OCA), Universite de Nice-Sophia Antipolis (UNS), CNRS, Campus Valrose,
06108
Nice Cedex 2,
France
25
Laboratório Nacional de Astrofísica,
Rua Estados Unidos 154,
37504-364,
Itajubá,
MG,
Brazil
26
Observatoire de Haute Provence,
04870
Saint Michel l’Observatoire,
France
Received:
22
April
2021
Accepted:
28
June
2021
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%.
Key words: methods: observational / techniques: photometric / techniques: radial velocities / planets and satellites: gaseous planets / planetary systems
© C. Moutou et al. 2021
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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