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http://hdl.handle.net/20.500.12386/34295
Title: | Ariel stellar characterisation. I. Homogeneous stellar parameters of 187 FGK planet host stars: Description and validation of the method | Authors: | MAGRINI, Laura Danielski, C. Bossini, D. RAINER, Monica TURRINI, Diego BENATTI, Serena BRUCALASSI, Anna TSANTAKI, Maria Delgado Mena, E. SANNA, Nicoletta BIAZZO, Katia Campante, T. L. VAN DER SWAELMEN, Mathieu Benoit Jean Sousa, S. G. Hełminiak, K. G. Neitzel, A. W. Adibekyan, V. BRUNO, GIOVANNI Casali, G. |
Issue Date: | 2022 | Journal: | ASTRONOMY & ASTROPHYSICS | Number: | 663 | First Page: | A161 | Abstract: | Context. In 2020 the European Space Agency selected Ariel as the next mission to join the space fleet of observatories to study planets outside our Solar System. Ariel will be devoted to the characterisation of 1000 planetary atmospheres in order to understand what exoplanets are made of, how they form, and how they evolve. To achieve the last two goals all planets need to be studied within the context of their own host stars, which in turn must be analysed with the same technique, in a uniform way. <BR /> Aims: We present the spectro-photometric method we developed to infer the atmospheric parameters of the known host stars in the Tier 1 of the Ariel Reference Sample. <BR /> Methods: Our method is based on an iterative approach that combines spectral analysis, the determination of the surface gravity from Gaia data, and the determination of stellar masses from isochrone fitting. We validated our approach with the analysis of a control sample, composed of members of three open clusters with well-known ages and metallicities. <BR /> Results: We measured effective temperature T<SUB>eff</SUB>, surface gravity log g, and the metallicity [Fe/H] of 187 F-G-K stars within the Ariel Reference Sample. We presented the general properties of the sample, including their kinematics, which allows us to classify them into thin- and thick-disc populations. <BR /> Conclusions: A homogeneous determination of the parameters of the host stars is fundamental in the study of the stars themselves and their planetary systems. Our analysis systematically improves agreement with theoretical models and decreases uncertainties in the mass estimate (from 0.21 ± 0.30 to 0.10 ± 0.02 M<SUB>⊙</SUB>), providing useful data for the Ariel consortium and the astronomical community at large. <P />Tables A.1 and A.2 are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/663/A161">http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/663/A161</A> | URI: | http://hdl.handle.net/20.500.12386/34295 | URL: | http://arxiv.org/abs/2204.08825v1 https://www.aanda.org/articles/aa/full_html/2022/07/aa43405-22/aa43405-22.html |
ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/202243405 | Bibcode ADS: | 2022A&A...663A.161M | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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