Issue |
A&A
Volume 690, October 2024
|
|
---|---|---|
Article Number | A370 | |
Number of page(s) | 17 | |
Section | Stellar atmospheres | |
DOI | https://doi.org/10.1051/0004-6361/202450611 | |
Published online | 22 October 2024 |
The GAPS Programme at TNG
LXI. Atmospheric parameters and elemental abundances of TESS young exoplanet host stars★
1
INAF – Osservatorio Astronomico di Roma,
Via Frascati 33,
00040
Monte Porzio Catone (RM),
Italy
2
Dipartimento di Fisica, Università di Roma Tor Vergata,
Via della Ricerca Scientifica 1,
00133
Roma,
Italy
3
Dipartimento di Fisica, Sapienza Università di Roma,
Piazzale Aldo Moro 5,
00185
Roma,
Italy
4
ESO – European Southern Observatory,
Alonso de Córdova 3107, Casilla 19,
Santiago
19001,
Chile
5
INAF – Osservatorio Astronomico di Palermo,
Piazza del Parlamento 1,
90134
Palermo,
Italy
6
INAF – Osservatorio Astronomico di Padova,
Vicolo dell’Osservatorio 5,
35122
Padova,
Italy
7
INAF – Osservatorio Astrofisico di Torino,
Via Osservatorio 20,
10025
Pino Torinese,
Italy
8
Max Planck Institute for Astronomy,
Königstuhl 17,
69117
Heidelberg,
Germany
9
INAF – Osservatorio Astrofisico di Catania,
Via S. Sofia 78,
95123
Catania,
Italy
10
INAF – Osservatorio Astronomico di Trieste,
Via Tiepolo 11,
34143
Trieste,
Italy
11
INAF – Istituto di Astrofisica e Planetologia Spaziali,
Via del Fosso del Cavaliere 100,
00133
Roma,
Italy
12
Instituto de Astrofísica de Canarias (IAC), Calle Vía Láctea s/n,
38200
La Laguna, Tenerife,
Spain
13
Departamento de Astrofísica, Universidad de La Laguna (ULL),
38206
La Laguna, Tenerife,
Spain
14
Dipartimento di Fisica e Astronomia, Università di Padova,
Vicolo dell’Osservatorio 2,
35122
Padova,
Italy
15
Fundación Galileo Galilei – INAF,
Rambla José Ana Fernandez Pérez 7,
38712
Breña Baja (TF),
Spain
16
Dipartimento di Matematica e Fisica, Università Roma Tre,
Via della Vasca Navale 84,
00146
Roma,
Italy
★★ Corresponding author; simone.filomeno@inaf.it
Received:
4
May
2024
Accepted:
19
August
2024
Context. The study of exoplanets at different evolutionary stages can shed light on their formation, migration, and evolution. The determination of exoplanet properties depends on the properties of their host stars. It is therefore important to characterise the host stars for accurate knowledge on their planets.
Aims. Our final goal is to derive, in a homogeneous and accurate way, the stellar atmospheric parameters and elemental abundances of ten young TESS (Transiting Exoplanet Survey Satellite) transiting planet-hosting GK stars followed up with the HARPS-N (High Accuracy Radial velocity Planet Searcher for the Northern hemisphere) at TNG (Telescopio Nazionale Galileo) spectrograph within the Global Architecture of Planetary Systems (GAPS) programme.
Methods. We derived stellar kinematic properties, atmospheric parameters, and abundances of 18 elements. Depending on stellar parameters and chemical elements, we used methods based on line equivalent widths and spectral synthesis. Lithium line measurements were used as approximate age estimations. We exploited chemical abundances and their ratios to derive information on planetary composition.
Results. Elemental abundances and kinematic properties are consistent with the nearby Galactic thin disk. All targets show C/O<0.8 and 1.0<Mg/Si<1.5, compatible with an interpretation of silicate mantles made of a mixture of pyroxene and olivine assemblages for any rocky planets around them. The Fe/Mg ratios, with values of ~0.7–1.0, show a propensity for the planets to have big (iron) cores. All stars hosting very low-mass planets show Mg/Si values consistent with the Earth values, thus demonstrating their similar mantle composition. Hot Jupiter host stars show a lower content of O/Si, which could be related to the lower presence of water content. We confirm a trend found in the literature between stellar [O/Fe] and total planetary mass, implying an important role of the O in shaping the mass fraction of heavy elements in stars and their disks.
Conclusions. Exploring the composition of planets through the use of elemental abundances of their hosting stars holds promise for future investigations, particularly with large samples. Meanwhile, the detailed host star abundances provided can be employed for further studies on the composition of the planets within the current sample, when their atmospheres will be exploited.
Key words: techniques: spectroscopic / stars: abundances / stars: atmospheres / stars: fundamental parameters / planetary systems
Based on observations made with the Italian Telescopio Nazionale Galileo (TNG), operated on the island of La Palma by the INAF – Fundación Galileo Galilei at the Roque de los Muchachos Observatory of the Instituto de Astrofísica de Canarias (IAC) in the framework of the large programme Global Architecture of Planetary Systems (GAPS; PI: G. Micela).
© The Authors 2024
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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