Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/32034
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Faria, J. P. | en_US |
dc.contributor.author | Suárez Mascareño, A. | en_US |
dc.contributor.author | Figueira, P. | en_US |
dc.contributor.author | Silva, A. M. | en_US |
dc.contributor.author | Damasso, Mario | en_US |
dc.contributor.author | Demangeon, O. | en_US |
dc.contributor.author | Pepe, F. | en_US |
dc.contributor.author | Santos, N. C. | en_US |
dc.contributor.author | Rebolo, R. | en_US |
dc.contributor.author | CRISTIANI, Stefano | en_US |
dc.contributor.author | Adibekyan, V. | en_US |
dc.contributor.author | Alibert, Y. | en_US |
dc.contributor.author | Allart, R. | en_US |
dc.contributor.author | Barros, S. C. C. | en_US |
dc.contributor.author | Cabral, A. | en_US |
dc.contributor.author | D'ODORICO, Valentina | en_US |
dc.contributor.author | DI MARCANTONIO, Paolo | en_US |
dc.contributor.author | Dumusque, X. | en_US |
dc.contributor.author | Ehrenreich, D. | en_US |
dc.contributor.author | González Hernández, J. I. | en_US |
dc.contributor.author | Hara, N. | en_US |
dc.contributor.author | Lillo-Box, J. | en_US |
dc.contributor.author | Lo Curto, G. | en_US |
dc.contributor.author | Lovis, C. | en_US |
dc.contributor.author | Martins, C. J. A. P. | en_US |
dc.contributor.author | Mégevand, D. | en_US |
dc.contributor.author | Mehner, A. | en_US |
dc.contributor.author | MICELA, Giuseppina | en_US |
dc.contributor.author | MOLARO, Paolo | en_US |
dc.contributor.author | Nunes, N. J. | en_US |
dc.contributor.author | Pallé, E. | en_US |
dc.contributor.author | PORETTI, Ennio | en_US |
dc.contributor.author | Sousa, S. G. | en_US |
dc.contributor.author | SOZZETTI, Alessandro | en_US |
dc.contributor.author | Tabernero, H. | en_US |
dc.contributor.author | Udry, S. | en_US |
dc.contributor.author | Zapatero Osorio, M. R. | en_US |
dc.date.accessioned | 2022-03-29T13:03:07Z | - |
dc.date.available | 2022-03-29T13:03:07Z | - |
dc.date.issued | 2022 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/32034 | - |
dc.description.abstract | Context. Proxima Centauri is the closest star to the Sun. This small, low-mass, mid M dwarf is known to host an Earth-mass exoplanet with an orbital period of 11.2 days within the habitable zone, as well as a long-period planet candidate with an orbital period of close to 5 yr. <BR /> Aims: We report on the analysis of a large set of observations taken with the ESPRESSO spectrograph at the VLT aimed at a thorough evaluation of the presence of a third low-mass planetary companion, which started emerging during a previous campaign. <BR /> Methods: Radial velocities (RVs) were calculated using both a cross-correlation function (CCF) and a template matching approach. The RV analysis includes a component to model Proxima's activity using a Gaussian process (GP). We use the CCF's full width at half maximum to help constrain the GP, and we study other simultaneous observables as activity indicators in order to assess the nature of any potential RV signals. <BR /> Results: We detect a signal at 5.12 ± 0.04 days with a semi-amplitude of 39 ± 7 cm s<SUP>−1</SUP>. The analysis of subsets of the ESPRESSO data, the activity indicators, and chromatic RVs suggest that this signal is not caused by stellar variability but instead by a planetary companion with a minimum mass of 0.26 ± 0.05 M<SUB>⊕</SUB> (about twice the mass of Mars) orbiting at 0.029 au from the star. The orbital eccentricity is well constrained and compatible with a circular orbit. <P />Based on Guaranteed Time Observations collected at the European Southern Observatory (ESO) by the ESPRESSO Consortium under ESO programmes 1102.C-0744, 1102.C-0958, 1104.C-0350, and 106.21M2. | en_US |
dc.language.iso | eng | en_US |
dc.title | A candidate short-period sub-Earth orbiting Proxima Centauri | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/202142337 | en_US |
dc.identifier.scopus | 2-s2.0-85124694181 | en_US |
dc.identifier.url | http://arxiv.org/abs/2202.05188v1 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/full_html/2022/02/aa42337-21/aa42337-21.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 658 | en_US |
dc.relation.firstpage | A115 | 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 | - |
dc.identifier.adsbibcode | 2022A&A...658A.115F | 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 |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.fulltext | With Fulltext | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
crisitem.author.dept | O.A. Torino | - |
crisitem.author.dept | O.A. Trieste | - |
crisitem.author.dept | O.A. Trieste | - |
crisitem.author.dept | O.A. Trieste | - |
crisitem.author.dept | O.A. Palermo | - |
crisitem.author.dept | O.A. Trieste | - |
crisitem.author.dept | O.A. Brera | - |
crisitem.author.dept | O.A. Torino | - |
crisitem.author.orcid | 0000-0001-9984-4278 | - |
crisitem.author.orcid | 0000-0002-2115-5234 | - |
crisitem.author.orcid | 0000-0003-3693-3091 | - |
crisitem.author.orcid | 0000-0003-3168-2289 | - |
crisitem.author.orcid | 0000-0002-9900-4751 | - |
crisitem.author.orcid | 0000-0002-0571-4163 | - |
crisitem.author.orcid | 0000-0003-1200-0473 | - |
crisitem.author.orcid | 0000-0002-7504-365X | - |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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Fariaetal.2022.pdf | Pdf editoriale | 1.35 MB | Adobe PDF | View/Open |
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