J/ApJ/794/110ivo://CDS.VizieR/J/ApJ/794/110doi:10.26093/cds/vizier.17940110CDSJenkins J.S.Tuomi M.2017-07-03T13:50:21Z2017-05-16T15:42:20ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frg-starsradial-velocityGaining a better understanding of the effects of stellar-induced radial velocity noise is critical for the future of exoplanet studies since the discovery of the lowest-mass planets using this method will require us to go below the intrinsic stellar noise limit. An interesting test case in this respect is that of the southern solar analog HD 41248. The radial velocity time series of this star has been proposed to contain either a pair of signals with periods of around 18 and 25 days, which could be due to a pair of resonant super-Earths, or a single and varying 25 day signal that could arise due to a complex interplay between differential rotation and modulated activity. In this work, we build up more evidence for the former scenario, showing that the signals are still clearly significant, even after more than 10 yr of observations, and they likely do not change in period, amplitude, or phase as a function of time, the hallmarks of static Doppler signals. We show that over the last two observing seasons, this star was more intrinsically active and the noise reddened, highlighting why better noise models are needed to find the lowest amplitude signals, in particular, models that consider noise correlations. This analysis shows that there is still sufficient evidence for the existence of two super-Earths on the edge of, or locked into, a 7:5 mean motion resonance orbiting HD 41248.2014ApJ...794..110Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/794/110CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/566/A35 : Radial velocities of HD 41248 (Santos+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/794/110https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/794/110http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/794/110https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/794/110https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/794/110http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/794/110GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/794/110/table1HARPS timeseries data for HD41248recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Date of observationdtime.epochdoubleRVelRadial velocitym/sphys.veloc;pos.heliocentricfloate_RVelUncertainty in RVelm/sstat.error;spect.dopplerVelocfloatS-indexChromospheric activity S-indexspect.indexfloatBISBisector inverse slopem/sphys.velocfloatFWHMFull-Width at Half-Maximumm/sspect.line.widthfloat