Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/32020
DC Field | Value | Language |
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dc.contributor.author | Toledo-Padrón, B. | en_US |
dc.contributor.author | Lovis, C. | en_US |
dc.contributor.author | Suárez Mascareño, A. | en_US |
dc.contributor.author | Barros, S. C. C. | en_US |
dc.contributor.author | González Hernández, J. I. | en_US |
dc.contributor.author | SOZZETTI, Alessandro | en_US |
dc.contributor.author | Bouchy, F. | en_US |
dc.contributor.author | Zapatero Osorio, M. R. | en_US |
dc.contributor.author | Rebolo, R. | en_US |
dc.contributor.author | Cristiani, S. | en_US |
dc.contributor.author | Pepe, F. A. | en_US |
dc.contributor.author | Santos, N. C. | en_US |
dc.contributor.author | Sousa, S. G. | en_US |
dc.contributor.author | Tabernero, H. M. | en_US |
dc.contributor.author | Lillo-Box, J. | en_US |
dc.contributor.author | Bossini, D. | en_US |
dc.contributor.author | Adibekyan, V. | en_US |
dc.contributor.author | Allart, R. | en_US |
dc.contributor.author | Damasso, Mario | en_US |
dc.contributor.author | D'ODORICO, Valentina | en_US |
dc.contributor.author | Figueira, P. | en_US |
dc.contributor.author | Lavie, B. | en_US |
dc.contributor.author | Lo Curto, G. | en_US |
dc.contributor.author | Mehner, A. | en_US |
dc.contributor.author | MICELA, Giuseppina | en_US |
dc.contributor.author | Modigliani, A. | en_US |
dc.contributor.author | Nunes, N. J. | en_US |
dc.contributor.author | Pallé, E. | en_US |
dc.contributor.author | Abreu, M. | en_US |
dc.contributor.author | Affolter, M. | en_US |
dc.contributor.author | Alibert, Y. | en_US |
dc.contributor.author | Aliverti, M. | en_US |
dc.contributor.author | Allende Prieto, C. | en_US |
dc.contributor.author | Alves, D. | en_US |
dc.contributor.author | Amate, M. | en_US |
dc.contributor.author | Avila, G. | en_US |
dc.contributor.author | Baldini, V. | en_US |
dc.contributor.author | Bandy, T. | en_US |
dc.contributor.author | BENATTI, SERENA | en_US |
dc.contributor.author | Benz, W. | en_US |
dc.contributor.author | Bianco, A. | en_US |
dc.contributor.author | Broeg, C. | en_US |
dc.contributor.author | Cabral, A. | en_US |
dc.contributor.author | Calderone, G. | en_US |
dc.contributor.author | Cirami, R. | en_US |
dc.contributor.author | Coelho, J. | en_US |
dc.contributor.author | Conconi, P. | en_US |
dc.contributor.author | CORETTI, Igor | en_US |
dc.contributor.author | Cumani, C. | en_US |
dc.contributor.author | Cupani, G. | en_US |
dc.contributor.author | Deiries, S. | en_US |
dc.contributor.author | Dekker, H. | en_US |
dc.contributor.author | Delabre, B. | en_US |
dc.contributor.author | Demangeon, O. | en_US |
dc.contributor.author | Di Marcantonio, P. | en_US |
dc.contributor.author | Ehrenreich, D. | en_US |
dc.contributor.author | Fragoso, A. | en_US |
dc.contributor.author | Genolet, L. | en_US |
dc.contributor.author | Genoni, M. | en_US |
dc.contributor.author | Génova Santos, R. | en_US |
dc.contributor.author | Hughes, I. | en_US |
dc.contributor.author | Iwert, O. | en_US |
dc.contributor.author | Knudstrup, J. | en_US |
dc.contributor.author | Landoni, M. | en_US |
dc.contributor.author | Lizon, J. L. | en_US |
dc.contributor.author | Maire, C. | en_US |
dc.contributor.author | Manescau, A. | en_US |
dc.contributor.author | Martins, C. J. A. P. | en_US |
dc.contributor.author | Mégevand, D. | en_US |
dc.contributor.author | Molaro, P. | en_US |
dc.contributor.author | Monteiro, M. J. P. F. G. | en_US |
dc.contributor.author | Monteiro, M. A. | en_US |
dc.contributor.author | Moschetti, M. | en_US |
dc.contributor.author | Mueller, E. | en_US |
dc.contributor.author | Oggioni, L. | en_US |
dc.contributor.author | Oliveira, A. | en_US |
dc.contributor.author | Oshagh, M. | en_US |
dc.contributor.author | Pariani, G. | en_US |
dc.contributor.author | Pasquini, L. | en_US |
dc.contributor.author | Poretti, E. | en_US |
dc.contributor.author | Rasilla, J. L. | en_US |
dc.contributor.author | Redaelli, E. | en_US |
dc.contributor.author | Riva, M. | en_US |
dc.contributor.author | Santana Tschudi, S. | en_US |
dc.contributor.author | Santin, P. | en_US |
dc.contributor.author | Santos, P. | en_US |
dc.contributor.author | Segovia, A. | en_US |
dc.contributor.author | Sosnowska, D. | en_US |
dc.contributor.author | Spanò, P. | en_US |
dc.contributor.author | Tenegi, F. | en_US |
dc.contributor.author | Udry, S. | en_US |
dc.contributor.author | Zanutta, A. | en_US |
dc.contributor.author | Zerbi, F. | en_US |
dc.date.accessioned | 2022-03-29T12:16:34Z | - |
dc.date.available | 2022-03-29T12:16:34Z | - |
dc.date.issued | 2020 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/32020 | - |
dc.description.abstract | Context. An accurate characterization of the known exoplanet population is key to understanding the origin and evolution of planetary systems. Determining true planetary masses through the radial velocity (RV) method is expected to experience a great improvement thanks to the availability of ultra-stable echelle spectrographs. <BR /> Aims: We took advantage of the extreme precision of the new-generation echelle spectrograph ESPRESSO to characterize the transiting planetary system orbiting the G2V star K2-38 located at 194 pc from the Sun with V ~ 11.4. This system is particularly interesting because it could contain the densest planet detected to date. <BR /> Methods: We carried out a photometric analysis of the available K2 photometric light curve of this star to measure the radius of its two known planets, K2-38b and K2-38c, with P<SUB>b</SUB> = 4.01593 ± 0.00050 d and P<SUB>c</SUB> = 10.56103 ± 0.00090 d, respectively. Using 43 ESPRESSO high-precision RV measurements taken over the course of 8 months along with the 14 previously published HIRES RV measurements, we modeled the orbits of the two planets through a Markov chain Monte Carlo analysis, significantly improving their mass measurements. <BR /> Results: Using ESPRESSO spectra, we derived the stellar parameters, T<SUB>eff</SUB> = 5731 ± 66, log g = 4.38 ± 0.11 dex, and [Fe/H] = 0.26 ± 0.05 dex, and thus the mass and radius of K2-38, M<SUB>⋆</SUB> = 1.03<SUB>-0.02</SUB><SUP>+0.04</SUP> M<SUB>⊕</SUB> and R<SUB>⋆</SUB> = 1.06<SUB>-0.06</SUB><SUP>+0.09</SUP> R<SUB>⊕</SUB>. We determine new values for the planetary properties of both planets. We characterize K2-38b as a super-Earth with R<SUB>P</SUB> = 1.54 ± 0.14 R<SUB>⊕</SUB> and M<SUB>p</SUB> = 7.3<SUB>-1.0</SUB><SUP>+1.1</SUP> M<SUB>⊕</SUB>, and K2-38c as a sub-Neptune with R<SUB>P</SUB> = 2.29 ± 0.26 R<SUB>⊕</SUB> and M<SUB>p</SUB> = 8.3<SUB>-1.3</SUB><SUP>+1.3</SUP> M<SUB>⊕</SUB>. Combining the radius and mass measurements, we derived a mean density of ρ<SUB>p</SUB> = 11.0<SUB>-2.8</SUB><SUP>+4.1</SUP> g cm<SUP>-3</SUP> for K2-38b and ρ<SUB>p</SUB> = 3.8<SUB>-1.1</SUB><SUP>+1.8</SUP> g cm<SUP>-3</SUP> for K2-38c, confirming K2-38b as one of the densest planets known to date. <BR /> Conclusions: The best description for the composition of K2-38b comes from an iron-rich Mercury-like model, while K2-38c is better described by a rocky-model with H2 envelope. The maximum collision stripping boundary shows how giant impacts could be the cause for the high density of K2-38b. The irradiation received by each planet places them on opposite sides of the radius valley. We find evidence of a long-period signal in the RV time-series whose origin could be linked to a 0.25-3 M<SUB>J</SUB> planet or stellar activity. <P />The ESPRESSO RVs used in this paper are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://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/641/A92">http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/641/A92</A> <P />Based (in part) on Guaranteed Time Observations collected at the European Southern Observatory under ESO programmes1102.C-0744, 112.C-0958, and 1104.C-0350 by the ESPRESSO Consortium. | en_US |
dc.language.iso | eng | en_US |
dc.title | Characterization of the K2-38 planetary system. Unraveling one of the densest planets known to date | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/202038187 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/full_html/2020/09/aa38187-20/aa38187-20.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 641 | en_US |
dc.relation.firstpage | A92 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | sì | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | ASTRONOMY & ASTROPHYSICS | en_US |
dc.type.miur | 262 Articolo in rivista | en_US |
dc.identifier.adsbibcode | 2020A&A...641A..92T | en_US |
dc.relation.ercsector | ERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
local.message.claim | 2022-03-30T11:19:42.235+0200|||rp08768|||submit_approve|||dc_contributor_author|||None | * |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | O.A. Torino | - |
crisitem.author.dept | O.A. Torino | - |
crisitem.author.dept | O.A. Trieste | - |
crisitem.author.dept | O.A. Palermo | - |
crisitem.author.dept | O.A. Palermo | - |
crisitem.author.dept | O.A. Trieste | - |
crisitem.author.orcid | 0000-0002-7504-365X | - |
crisitem.author.orcid | 0000-0001-9984-4278 | - |
crisitem.author.orcid | 0000-0003-3693-3091 | - |
crisitem.author.orcid | 0000-0002-9900-4751 | - |
crisitem.author.orcid | 0000-0002-4638-3495 | - |
crisitem.author.orcid | 0000-0001-9374-3249 | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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Toledoetal.2020-compressed.pdf | Pdf editoriale | 3.61 MB | Adobe PDF | View/Open |
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