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dc.rights.license© ESO 2020-
dc.contributor.authorSuárez Mascareño, A.-
dc.contributor.authorFaria, J. P.-
dc.contributor.authorFigueira, P.-
dc.contributor.authorLovis, C.-
dc.contributor.authorDamasso, M.-
dc.contributor.authorGonzález Hernández, J. I.-
dc.contributor.authorRebolo, R.-
dc.contributor.authorCristiani, S.-
dc.contributor.authorPepe, F.-
dc.contributor.authorSantos, N. C.-
dc.contributor.authorZapatero Osorio, M. R.-
dc.contributor.authorAdibekyan, V.-
dc.contributor.authorHojjatpanah, S.-
dc.contributor.authorSozzetti, A.-
dc.contributor.authorMurgas Alcaino, F.-
dc.contributor.authorAbreu, M.-
dc.contributor.authorAffolter, M.-
dc.contributor.authorAlibert, Y.-
dc.contributor.authorAliverti, M.-
dc.contributor.authorAllart, R.-
dc.contributor.authorAllende Prieto, C.-
dc.contributor.authorAlves, D.-
dc.contributor.authorAmate, M.-
dc.contributor.authorÁvila, G.-
dc.contributor.authorBaldini, V.-
dc.contributor.authorBandi, T.-
dc.contributor.authorBarros, S. C. C.-
dc.contributor.authorBianco, A.-
dc.contributor.authorBenz, W.-
dc.contributor.authorBouchy, F.-
dc.contributor.authorBroeg, C.-
dc.contributor.authorCabral, A.-
dc.contributor.authorCalderone, G.-
dc.contributor.authorCirami, R.-
dc.contributor.authorCoelho, J.-
dc.contributor.authorConconi, P.-
dc.contributor.authorCoretti, I.-
dc.contributor.authorCumani, C.-
dc.contributor.authorCupani, G.-
dc.contributor.authorD´Odorico, V.-
dc.contributor.authorDeiries, S.-
dc.contributor.authorDelabre, B.-
dc.contributor.authorDi Marcantonio, P.-
dc.contributor.authorDumusque, X.-
dc.contributor.authorEhrenreich, D.-
dc.contributor.authorFragoso, A.-
dc.contributor.authorGenolet, L.-
dc.contributor.authorGenoni, M.-
dc.contributor.authorGénova Santos, R.-
dc.contributor.authorHughes, I.-
dc.contributor.authorIwert, O.-
dc.contributor.authorKerber, F.-
dc.contributor.authorKnusdstrup, J.-
dc.contributor.authorLandoni, M.-
dc.contributor.authorLavie, B.-
dc.contributor.authorLillo Box, J.-
dc.contributor.authorLizon, J.-
dc.contributor.authorLo Curto, G.-
dc.contributor.authorMaire, C.-
dc.contributor.authorManescau, A.-
dc.contributor.authorMartins, C. J. A. P.-
dc.contributor.authorMégevand, D.-
dc.contributor.authorMehner, A.-
dc.contributor.authorMicela, G.-
dc.contributor.authorModigliani, A.-
dc.contributor.authorMolaro, P.-
dc.contributor.authorMonteiro, M. A.-
dc.contributor.authorMonteiro, M. J. P. F. G.-
dc.contributor.authorMoschetti, M.-
dc.contributor.authorMueller, E.-
dc.contributor.authorNunes, N. J.-
dc.contributor.authorOggioni, L.-
dc.contributor.authorOliveira, A.-
dc.contributor.authorPallé, E.-
dc.contributor.authorPariani, G.-
dc.contributor.authorPasquini, L.-
dc.contributor.authorPoretti, E.-
dc.contributor.authorRasilla, J. L.-
dc.contributor.authorRedaelli, E.-
dc.contributor.authorRiva, M.-
dc.contributor.authorSantana Tschudi, S.-
dc.contributor.authorSantin, P.-
dc.contributor.authorSantos, P.-
dc.contributor.authorSegovia, A.-
dc.contributor.authorSosnowska, D.-
dc.contributor.authorSousa, S.-
dc.contributor.authorSpanò, P.-
dc.contributor.authorTenegi, F.-
dc.contributor.authorUdry, S.-
dc.contributor.authorZanutta, A.-
dc.contributor.authorZerbi, Filippo M.-
dc.contributor.otherUnidad de Excelencia Científica María de Maeztu Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737-
dc.date.accessioned2021-04-19T08:59:52Z-
dc.date.available2021-04-19T08:59:52Z-
dc.date.issued2020-07-13-
dc.identifier.citationAstronomy and Astrophysics 639: A79(2020)es
dc.identifier.issn0004-6361-
dc.identifier.otherhttps://www.aanda.org/articles/aa/abs/2020/07/aa37745-20/aa37745-20.html-
dc.identifier.urihttp://hdl.handle.net/20.500.12666/413-
dc.descriptionThe data used in this paper are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/639/A77 Based [in part] on Guaranteed Time Observations collected at the European Southern Observatory under ESO programme 1102.C-0744. by the ESPRESSO Consortium. This work makes use of observations from the LCOGT network.es
dc.description.abstractContext. The discovery of Proxima b marked one of the most important milestones in exoplanetary science in recent years. Yet the limited precision of the available radial velocity data and the difficulty in modelling the stellar activity calls for a confirmation of the Earth-mass planet. Aims. We aim to confirm the presence of Proxima b using independent measurements obtained with the new ESPRESSO spectrograph, and refine the planetary parameters taking advantage of its improved precision. Methods. We analysed 63 spectroscopic ESPRESSO observations of Proxima (Gl 551) taken during 2019. We obtained radial velocity measurements with a typical radial velocity photon noise of 26 cm s−1. We combined these data with archival spectroscopic observations and newly obtained photometric measurements to model the stellar activity signals and disentangle them from planetary signals in the radial velocity (RV) data. We ran a joint Markov chain Monte Carlo analysis on the time series of the RV and full width half maximum of the cross-correlation function to model the planetary and stellar signals present in the data, applying Gaussian process regression to deal with the stellar activity signals. Results. We confirm the presence of Proxima b independently in the ESPRESSO data and in the combined ESPRESSO+ HARPS+UVES dataset. The ESPRESSO data on its own shows Proxima b at a period of 11.218 ± 0.029 days, with a minimum mass of 1.29 ± 0.13 M⊕. In the combined dataset we measure a period of 11.18427 ± 0.00070 days with a minimum mass of 1.173 ± 0.086 M⊕. We get a clear measurement of the stellar rotation period (87 ± 12 d) and its induced RV signal, but no evidence of stellar activity as a potential cause for the 11.2 days signal. We find some evidence for the presence of a second short-period signal, at 5.15 days with a semi-amplitude of only 40 cm s−1. If caused by a planetary companion, it would correspond to a minimum mass of 0.29 ± 0.08 M⊕. We find that forthe case of Proxima, the full width half maximum of the cross-correlation function can be used as a proxy for the brightness changes and that its gradient with time can be used to successfully detrend the RV data from part of the influence of stellar activity. The activity-induced RV signal in the ESPRESSO data shows a trend in amplitude towards redder wavelengths. Velocities measured using the red end of the spectrograph are less affected by activity, suggesting that the stellar activity is spot dominated. This could be used to create differential RVs that are activity dominated and can be used to disentangle activity-induced and planetary-induced signals. The data collected excludes the presence of extra companions with masses above 0.6 M⊕ at periods shorter than 50 days.es
dc.description.sponsorshipA.S.M. acknowledges financial support from the Spanish Ministry of Science and Innovation (MICINN) under the 2019 Juan de la Cierva Programme. A.S.M., J.I.G.H., R.R., and C.A.P. acknowledge financial support from the Spanish Ministry of Science, Innovation, and Universities (MICIU) AYA2017-86389-P. J.I.G.H. acknowledges financial support from Spanish MICIU under the 2013 Ramon y Cajal programme RYC-2013-14875. FPE and CLO would like to acknowledge the Swiss National Science Foundation (SNSF) for supporting research with ESPRESSO through the SNSF grants nr. 140649, 152721, 166227, and 184618. The ESPRESSO Instrument Project was partially funded through SNSF's FLARE programme for large infrastructures. This work was financed by FEDER (Fundo Europeu de Desenvolvimento Regional) funds through the COMPETE 2020 Operational Programme for Competitiveness and Internationalisation (POCI), and by Portuguese funds through FCT (Fundacao para a Ciencia e a Tecnologia) in the framework of the project with references POCI-01-0145-FEDER-028987 and PTDC/FIS-AST/28987/2017. This work was supported by FCT through national funds and by FEDER through COMPETE2020 -Programa Operacional Competitividade e Internacionalizacao by these grants: UID/FIS/04434/2019; UIDB/04434/2020; UIDP/04434/2020; PTDC/FIS-AST/32113/2017 & POCI-01-0145-FEDER032113; PTDC/FIS-AST/28953/2017 & POCI-01-0145-FEDER-028953; PTDC/FIS-AST/28987/2017 & POCI-01-0145-FEDER-028987; PTDC/FIS-OUT/29048/2017. V.Z.A., S.G.S. and S.C.C.B. acknowledge support from FCT through Investigador FCT contracts nso IF/00650/2015/CP1273/CT0001; IF/00028/2014/CP1215/CT0002; IF/01312/2014/CP1215/CT0004. S.G.S. also acknowledges support from FCT in the form of an exploratory project with the reference IF/00028/2014/CP1215/CT0002. J.P.F. and O.D. acknowledge support from FCT through national funds in the form of a work contract with the references DL 57/2016/CP1364/CT0005; DL 57/2016/CP1364/CT0004. SCCB acknowledges support from FCT through Investigador FCT contract IF/01312/2014/CP1215/CT0004. This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (project FOUR ACES; grant agreement No 724427). This work has been carried out within the framework of the National Centre of Competence in Research PlanetS supported by the Swiss National Science Foundation. R.A. acknowledges the financial support of the SNSF. This research has made use of the SIMBAD database and of the VizieR catalogue access tool operated at CDS, France, and used the DACE platform developed in the frame of PlanetS (https://dace.unige.ch).This work is based (in part) on data obtained via the database at the European Southern Observatory (ESO). We are grateful to all the observers of the following ESO projects, whose data we are using: 072.C-0488, 082.C-0718, 183.C-0437, 191.C-0505,096.C-0082, 099.C-0205, 099.C-0880, 65.L-0428, 66.C-0446, 267.C-5700,68.C-0415, 69.C-0722, 70.C-0044, 71.C-0498, 072.C-0495, 173.C-0606, 078.C-0829; With funding from the Spanish government through the "María de Maeztu Unit of Excellence" accreditation (MDM-2017-0737).es
dc.language.isoenges
dc.publisherEDP Scienceses
dc.relationinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/AYA2017-86389-P/ES/ESPECTROSCOPIA DE ALTA RESOLUCION ORIENTADA AL ESTUDIO DE EXOTIERRAS Y LA FORMACION DE LA VIA LACTEA. EXPLOTACION CIENTIFICA DE ESPRESSO Y HORS/-
dc.relationinfo:eu-repo/grantAgreement/MINECO//RYC-2013-14875-
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internationales
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/-
dc.subjectTechniques: radial velocitieses
dc.subjectPlanets and satellites: terrestrial planetses
dc.subjectStars: loww-masses
dc.subjectStars: activityes
dc.subjectStars: individual: Proximaes
dc.titleRevisiting Proxima with ESPRESSOes
dc.typeinfo:eu-repo/semantics/articlees
dc.contributor.orcidLillo Box, J. [0000-0003-3742-1987]-
dc.contributor.orcidFaria, J. [0000-0002-6728-244X]-
dc.contributor.orcidNunes, N. J. [0000-0002-3837-6914]-
dc.contributor.orcidMolaro, P. [0000-0002-0571-4163]-
dc.contributor.orcidMascareño, A. S. [0000-0002-3814-5323]-
dc.contributor.orcidCabral, A. [0000-0002-9433-871X]-
dc.contributor.orcidMonteiro, M. J. P. F. G. [0000-0003-0513-8116]-
dc.contributor.orcidRedaelli, E. M. A. [0000-0001-8185-2122]-
dc.contributor.orcidBarros, S. [0000-0003-2434-3625]-
dc.contributor.orcidSantos, N. [0000-0003-4422-2919]-
dc.contributor.orcidAbreu, M. [0000-0002-0716-9568]-
dc.contributor.orcidCoretti, I. [0000-0001-9374-3249]-
dc.contributor.orcidSozzetti, A. [0000-0002-7504-365X]-
dc.contributor.orcidAdibekyan, V. [0000-0002-0601-6199]-
dc.contributor.orcidMonteiro, M. [0000-0001-5644-0898]-
dc.contributor.orcidDamasso, M. [0000-0001-9984-4278]-
dc.identifier.doi10.1051/0004-6361/202037745-
dc.identifier.e-issn1432-0746-
dc.contributor.funderAgencia Estatal de Investigación (AEI)-
dc.contributor.funderMinisterio de Economía y Competitividad (MINECO)-
dc.contributor.funderSwiss National Science Foundation (SNSF)-
dc.contributor.funderFundacao para a Ciencia e a Tecnologia (FCT)-
dc.contributor.funderEuropean Research Council (ERC)-
dc.description.peerreviewedPeer reviewes
dc.identifier.funderhttp://dx.doi.org/10.13039/501100011033-
dc.identifier.funderhttp://dx.doi.org/10.13039/501100003329-
dc.identifier.funderhttp://dx.doi.org/10.13039/501100001711-
dc.identifier.funderhttp://dx.doi.org/10.13039/501100001871-
dc.identifier.funderhttp://dx.doi.org/10.13039/501100000781-
dc.type.hasVersioninfo:eu-repo/semantics/publishedVersion-
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess-
dc.type.coarhttp://purl.org/coar/resource_type/c_6501-
dc.relation.projectIDinfo:eu-repo/grantAgreement/EC/H2020/724427-
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