J/AJ/155/192ivo://CDS.VizieR/J/AJ/155/192doi:10.26093/cds/vizier.51550192CDSTuomi M.Jones H.R.A.Barnes J.R.Anglada-Escude G.Butler R.P.,Kiraga M.Vogt S.S.2019-01-07T09:28:49Z2018-12-05T14:08:57ZCDS support team

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

cds-question@unistra.frdwarf-starsm-starsradial-velocityvisible-astronomybroad-band-photometryAD Leonis is a nearby magnetically active M dwarf. We find Doppler variability with a period of 2.23 days, as well as photometric signals: (1) a short-period signal, which is similar to the radial velocity signal, albeit with considerable variability; and (2) a long-term activity cycle of 4070+/-120 days. We examine the short-term photometric signal in the available All-Sky Automated Survey and Microvariability and Oscillations of STars (MOST) photometry and find that the signal is not consistently present and varies considerably as a function of time. This signal undergoes a phase change of roughly 0.8 rad when considering the first and second halves of the MOST data set, which are separated in median time by 3.38 days. In contrast, the Doppler signal is stable in the combined High-Accuracy Radial velocity Planet Searcher and High Resolution Echelle Spectrometer radial velocities for over 4700 days and does not appear to vary in time in amplitude, phase, period, or as a function of extracted wavelength. We consider a variety of starspot scenarios and find it challenging to simultaneously explain the rapidly varying photometric signal and the stable radial velocity signal as being caused by starspots corotating on the stellar surface. This suggests that the origin of the Doppler periodicity might be the gravitational tug of a planet orbiting the star in spin-orbit resonance. For such a scenario and no spin-orbit misalignment, the measured vsini indicates an inclination angle of 15.5+/-2.5{deg} and a planetary companion mass of 0.237+/-0.047 M_Jup_.2018AJ....155..192Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/155/192CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/264 : ASAS Variable Stars in Southern hemisphereJ/A+A/474/293 : Radial velocities of GJ 674 (Bonfils+, 2007)J/MNRAS/390/567 : Magnetic field and velocity of mid M dwarfs (Morin+, 2008)J/ApJS/200/15 : HARPS-TERRA project. I. (Anglada-Escude+, 2012)http://www.astrouw.edu.pl/asas : The All Sky Automated Survey (ASAS) websitehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/155/192https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/155/192http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/155/192https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/155/192https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/155/192http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/155/192GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap3.322582951404819e-19 3.852589004194616e-19OpticaldefaultJ/AJ/155/192/HARPS-RVHARPS radial velocity of AD Leo (table 4) and GJ 674 (table 6) for all 72 individual orders v_i_, i=1, ..., 72recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharJD[2986.8579/6797.5118] Julian Date (JD-2450000)dtime.epochdoubleRV1[-588.71/1176.8] Radial velocity for the first datasetm/sspect.dopplerVelocfloate_RV1[51.51/321.81] Uncertainty in RV1m/sstat.errorfloatRV2[-1694.13/1210.13] Radial velocity for the second datasetm/sspect.dopplerVelocdoublee_RV2[58.77/286.01] Uncertainty in RV2m/sstat.errorfloatRV3[-631.43/1749.74] Radial velocity for the third datasetm/sspect.dopplerVelocfloate_RV3[44.38/296.29] Uncertainty in RV3m/sstat.errorfloatJ/AJ/155/192/PhotometryCombined table from original tablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPhotometryInstrument usedmeta.id;instrcharJDJulian Datedtime.epochdoubleVmag[9245/9391] ASAS V band magnitudemagphot.mag;em.opt.VintJ/AJ/155/192/HARPSdataCombined table from original tablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharJDJulian Datedtime.epochdoubleRV[-38.61/42.94] Radial velocitym/sphys.veloc;pos.heliocentricfloate_RV[0.32/2.07] Uncertainty in RVm/sstat.errorfloatBIS[-18.92/0.29] Bisector spanm/sphys.velocfloatFWHM[3018.96/3547.48] Full width at half maximumm/sspect.line.widthfloatSindex[1.006/11.415] S-index measuring the emission of Ca II H & K linesm/sspect.indexfloat