J/AJ/166/167ivo://CDS.VizieR/J/AJ/166/167doi:10.26093/cds/vizier.51660167CDSMetcalfe T.S.Buzasi D.Huber D.Pinsonneault M.H.van Saders J.L.,Ayres T.R.Basu S.Drake J.J.Egeland R.Kochukhov O.Petit P.,Saar S.H.See V.Stassun K.G.Li Y.Bedding T.R.Breton S.N.,Finley A.J.Garcia R.A.Kjeldsen H.Nielsen M.B.Ong J.M.J.,Rorsted J.L.Stokholm A.Winther M.L.Clark C.A.Godoy-Rivera D.,Ilyin I.V.Strassmeier K.G.Jeffers S.V.Marsden S.C.Vidotto A.A.,Baliunas S.Soon W.2024-11-06T20:17:59Z2024-04-22T07:49:49ZCDS support team

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

cds-question@unistra.frvisible-astronomyspectroscopyThe bright star {lambda}Ser hosts a hot Neptune with a minimum mass of 13.6M{Earth} and a 15.5day orbit. It also appears to be a solar analog, with a mean rotation period of 25.8days and surface differential rotation very similar to the Sun. We aim to characterize the fundamental properties of this system and constrain the evolutionary pathway that led to its present configuration. We detect solar-like oscillations in time series photometry from the Transiting Exoplanet Survey Satellite, and we derive precise asteroseismic properties from detailed modeling. We obtain new spectropolarimetric data, and we use them to reconstruct the large-scale magnetic field morphology. We reanalyze the complete time series of chromospheric activity measurements from the Mount Wilson Observatory, and we present new X-ray and ultraviolet observations from the Chandra and Hubble space telescopes. Finally, we use the updated observational constraints to assess the rotational history of the star and estimate the wind braking torque. We conclude that the remaining uncertainty on the stellar age currently prevents an unambiguous interpretation of the properties of {lambda}Ser, and that the rate of angular momentum loss appears to be higher than for other stars with a similar Rossby number. Future asteroseismic observations may help to improve the precision of the stellar age.2023AJ....166..167Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/166/167CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/457/L99 : 25yr CaII-HK obs of F-K nearby stars (Baliunas+, 1996)J/ApJ/725/875 : Chromospheric activity for CPS stars (Isaacson+, 2010)J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)J/MNRAS/444/3517 : BCool survey of solar-type stars (Marsden+ 2014)J/ApJS/211/24 : Rotation periods of Kepler MS stars (McQuillan+, 2014)J/A+A/580/A23 : Stroemgren-Crawford uvby{beta} photometry (Paunzen, 2015)J/ApJS/225/32 : Extended abundance analysis of cool stars (Brewer+, 2016)J/AJ/152/180 : Bolometric fluxes of eclipsing bin Tycho-2 (Stassun+, 2016)J/ApJ/835/172 : Kepler asteroseismic LEGACY sample. I. (Lund+, 2017)J/AJ/153/136 : Planets and host stars with Gaia parallaxes (Stassun+, 2017)J/ApJ/854/78 : Magnetohydrodynamic (MHD) simulations. II. (Finley+, 2018)J/A+A/615/A172 : alpha Cen A and B chemical composition (Morel, 2018)J/A+A/616/A7 : Gaia DR2 radial velocity standard stars (Soubiran+, 2018)J/MNRAS/495/2363 : Asteroseismology of 36 Kepler subgiants. I. (Li+, 2020)J/ApJ/900/154 : Mount Wilson S-Index of 94AqrA and 94AqrB (Metcalfe+, 2020)J/other/NatAs/5.707 : Dwarf stars asteroseismic rotation rates (Hall+, 2021)J/ApJ/921/122 : Chromospheric acti of {rho} CrB and 88 Leo (Metcalfe+, 2021)J/AJ/163/183 : S-value for 59 Sun-like starswith HIRES & HKP (Baum+, 2022)J/A+A/660/A141 : Light curve of the active star LQ Hya (Lehtinen+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/166/167https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/166/167http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/166/167https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/166/167https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/166/167http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/166/167GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/166/167/fig454-year S-index time series for {lambda} SerrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJD[-807/12440] Julian Date ; JD-2440000dtime.epochdoubleSIndex[0.13/0.67] S-Index valuespect.indexfloat