J/AJ/163/247ivo://CDS.VizieR/J/AJ/163/247doi:10.26093/cds/vizier.51630247CDSJohnson M.C.David T.J.Petigura E.A.Isaacson H.T.Van Zandt J.,Ilyin I.Strassmeier K.Mallonn M.Zhou G.Mann A.W.Livingston J.H.,Luger R.Dai F.Weiss L.M.Mocnik T.Giacalone S.Hill M.L.Rice M.,Blunt S.Rubenzahl R.Dalba P.A.Esquerdo G.A.Berlind P.Calkins M.L.,Foreman-Mackey D.2022-10-18T14:20:15Z2022-10-06T12:10:14ZCDS support team

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

cds-question@unistra.frexoplanetsvariable-starsvisible-astronomyspectroscopyradial-velocityThe alignment of planetary orbits with respect to the stellar rotation preserves information on their dynamical histories. Measuring this angle for young planets helps illuminate the mechanisms that create misaligned orbits for older planets, as different processes could operate over timescales ranging from a few megayears to a gigayear. We present spectroscopic transit observations of the young exoplanet V1298 Tau b; we update the age of V1298 Tau to be 28{+/-}4Myr based on Gaia EDR3 measurements. We observed a partial transit with Keck/HIRES and LBT/PEPSI, and detected the radial velocity anomaly due to the Rossiter-McLaughlin effect. V1298 Tau b has a prograde, well-aligned orbit, with {lambda}=4_-10_^+7^deg. By combining the spectroscopically measured vsini* and the photometrically measured rotation period of the host star we also find that the orbit is aligned in 3D, {psi}=8_-7_^+4^deg. Finally, we combine our obliquity constraints with a previous measurement for the interior planet V1298 Tau c to constrain the mutual inclination between the two planets to be i_mut_=0deg{+/-}19deg. This measurements adds to the growing number of well-aligned planets at young ages, hinting that misalignments may be generated over timescales of longer than tens of megayears. The number of measurements, however, is still small, and this population may not be representative of the older planets that have been observed to date. We also present the derivation of the relationship between imut, {lambda}, and i for the two planets.2022AJ....163..247Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/163/247CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/337 : Gaia DR1 (Gaia Collaboration, 2016)J/ApJ/723/L223 : Radial velocities of HAT-P-11 (Winn+, 2010)J/ApJ/757/18 : Radial velocities 16 hot Jupiter host stars (Albrecht+, 2012)J/other/Nat/486.375 : Stellar parameters of KOI stars (Buchhave+, 2012)J/MNRAS/474/2094 : Inferring proba. stellar rotation periods (Angus+, 2018)J/AJ/156/271 : The stellar membership of the Taurus SFR (Luhman, 2018)J/AJ/159/19 : SOAR TESS survey. I. (Ziegler+, 2020)J/AJ/162/137 : Minerva-Australis radial velocity of AU Mic (Addison+, 2021)J/AJ/162/292 : Radial velocity & transit photometry TOI-1431 (Addison+, 2021)J/A+A/650/A66 : DS Tuc A radial velocity curve (Benatti+, 2021)J/AJ/162/110 : Gaia EDR3 census of Taurus-Auriga complex (Krolikowski+, 2021)J/AJ/161/119 : The TESS-Keck survey. IV. Rvel for WASP-107 (Rubenzahl+, 2021)J/AJ/161/171 : THYME. V. Discovering stellar association (Tofflemire+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/163/247https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/163/247http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/163/247https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/163/247https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/163/247http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/163/247GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/163/247/table1Radial velocities of V1298 TaurecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[2458765/2458798] Barycentric Julian Date at TDBdtime.epochdoubleRVel[-479/290] Barycentric-corrected radial velocitym/sphys.veloc;pos.heliocentricfloate_RVel[5/148] Uncertainty in RVelm/sstat.error;spect.dopplerVelocfloatInstrInstrument used (1)instr.setupchar