J/AJ/158/45ivo://CDS.VizieR/J/AJ/158/45doi:10.26093/cds/vizier.51580045CDSBrahm R.Espinoza N.Jordan A.Henning T.Sarkis P.Jones M.I.,Diaz M.R.Jenkins J.S.Vanzi L.Zapata A.Petrovich C.Kossakowski D.,Rabus M.Rojas F.Torres P.2019-09-17T13:28:41Z2019-09-17T14:26:10ZCDS support team

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

cds-question@unistra.frphotometryvisible-astronomyradial-velocityexoplanetsWe report the discovery of a transiting planet first identified as a candidate in Sector 1 of the Transiting Exoplanet Survey Satellite (TESS), and then confirmed with precision radial velocities. HD 1397b has a mass of M_P_=0.367_-0.023_^+0.022^ M_J_, a radius of R_P_=1.023_-0.013_^+0.013^ R_J_, and orbits its bright host star (V=7.8 mag) with an orbital period of 11.5366+/-0.0003 d on a moderately eccentric orbit (e=0.216_-0.026_^+0.027^). With a mass of M_*_=1.257_-0.029_^+0.029^ M_{sun}_, a radius of R_*_=2.341_-0.019_^+0.022^ R_{sun}_, and an age of 4.46+/-0.25 Gyr, the solar-metallicity host star has already departed from the main sequence. We find evidence in the radial velocity measurements of a secondary signal with a longer period. We attribute it to the rotational modulation of stellar activity, but a long-term radial velocity monitoring would be necessary to discard if this signal is produced by a second planet in the system. The HD 1397 system is among the brightest ones currently known to host a transiting planet, which will make it possible to perform detailed follow-up observations in order to characterize the properties of giant planets orbiting evolved stars.2019AJ....158...45Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/158/45CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/809/77 : Transiting Exoplanet Survey Satellite (TESS) (Sullivan+, 2015)J/AJ/156/102 : The TESS Input Catalog and Candidate Target ListJ/ApJS/239/2 : Simulated exoplanets from TESS list of targets (Barclay+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/158/45https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/158/45http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/158/45https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/158/45https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/158/45http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/158/45GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/158/45/table130 minutes cadence TESS light curve data for HD 1397 obtained from the tesseract extraction of the full-frame images (FFIs) of Sector 2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Datedtime.epochdoubleFlux[0.995117/1.001652] Extracted flux divided by the median valuephot.flux;arith.ratiodoublee_Flux[5.7e-05/5.8e-05] The 1{sigma} error in Fluxstat.error;phot.fluxdoubleInstInstrument used (TESS)instr.setupcharJ/AJ/158/45/table4Relative radial velocities and bisector spans for HD 1397recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Datedtime.epochdoubleRV[30.6421/30.8181] Radial velocitykm/sphys.veloc;pos.heliocentricfloate_RV[0.002/0.014] Uncertainty in RVkm/sstat.errorfloatBIS[-0.044/0.051] Bisector spankm/sphys.velocfloate_BIS[0.002/0.014] Uncertainty in BISkm/sstat.errorfloatS[0.1789/0.2323]? S-indexspect.indexfloatnullablee_S[0.0015/0.0044]? Uncertainty in Sstat.errorfloatnullableInstInstrument used (FEROS, FIDEOS or HARPS)instr.setupchar