J/AJ/170/275ivo://CDS.VizieR/J/AJ/170/275CDSYee S.W.Tamburo P.Stefansson G.Garcia-Mejia J.Charbonneau D.,Barkaoui K.Collins K.A.Schwarz R.P.Narita N.Fukui A.Howard A.W.,Isaacson H.Fulton B.J.Dai F.2026-08-05T09:28:23Z2026-07-31T12:56:58ZCDS support team

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

cds-question@unistra.frexoplanetsradial-velocitymultiple-starsvisible-astronomyspectroscopyThe "Neptunian ridge" is a recently identified peak in the frequency of planets with sizes between that of Neptune and Saturn orbiting their host stars with periods between 3 and 6days. These planets may have formed similarly to their larger, hot Jupiter counterparts in the "3 day pileup," through a dynamically excited migration pathway. The distribution of stellar obliquities in hot Neptune systems may therefore provide a vital clue as to their origin. We report a new stellar obliquity measurement for TOI-2374b, a planet in the Neptunian ridge (P=4.31days, R_p_=7.5R_{Earth}_). We observed a spectroscopic transit of TOI-2374b with the Keck Planet Finder, detecting the Rossiter-McLaughlin (RM) anomaly with an amplitude of 3m/s, and measured a sky-projected obliquity of {lambda}=81{deg}_-22{deg}_^+23{deg}^, indicating an orbit significantly misaligned with the spin axis of its host star. A reloaded RM analysis of the cross-correlation functions confirms this misalignment, measuring {lambda}=65{deg}_-24{deg}_^+32{deg}^. Additionally, we measured a stellar rotation period of P_rot_=26.4_-0.8_^+0.9^days with photometry from the Tierras observatory, allowing us to deduce the three-dimensional stellar obliquity of {psi}=85.9{deg}_-9.2{deg}_^+8.6{deg}^. TOI-2374b joins a growing number of hot Neptunes on polar orbits. The high frequency of misaligned orbits for Neptunian ridge and desert planets, compared with their longer period counterparts, is reminiscent of patterns seen for the giant planets and may suggest a similar formation mechanism.2025AJ....170..275Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/170/275CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/ApJS/159/141 : Spectroscopic properties of cool stars. I. (Valenti+, 2005)J/ApJ/723/L223 : Radial velocities of HAT-P-11 (Winn+, 2010)J/MNRAS/456/2070 : Eccentricity distribution of wide binar. (Tokovinin+, 2016)J/MNRAS/474/2094 : Inferring probabilistic stellar rot. periods (Angus+, 2018)J/A+A/649/A3 : Gaia EDR3 photometric passbands (Riello+, 2021)J/ApJ/919/138 : Rot. vel. & per. of hot Jup. host stars (Tejada Arevalo+, 2021)J/AJ/163/160 : Properties of 170 TOI hosts and companions (Behmard+, 2022)J/AJ/163/207 : 67 binary stars with exoplanets: Gaia EDR3 (Christian+, 2022)J/ApJ/931/L15 : Obs. of 2 transits of GJ 3470b with NEID (Stefansson+, 2022)J/AJ/163/253 : The Perkins INfrared Exosatellite Survey. I. (Tamburo+, 2022)J/A+A/679/A70 : TOI-858 A and TOI-858 B RV data (Hagelberg+, 2023)J/A+A/689/A250 : Kepler DR25 transit & detec. prob. (Castro-Gonzale+, 2024)J/ApJ/962/47 : TESS stellar rotation in the Southern CVZ (Claytor+, 2024)J/AJ/168/185 : HATS-38b & WASP-139b: LCs & RVs (Espinoza-Retamal+, 2024)J/A+A/690/A379 : Obliquities of exoplanet host stars (Knudstrup+, 2024)J/AJ/168/116 : NEID radial velocities of TOI-5126 & TOI-5398 (Radzom+, 2024)J/AJ/170/15 : Rotation periods of 272 stars from TESS & ZTF (Hattori+, 2025)J/AJ/170/34 : TESS & KPF: TOI-2364 LCs & RVs (Tamburo+, 2025)J/AJ/169/225 : RVs & LCs of WASP-193 from TESS, PFS, & LCRO (Yee+, 2025)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/170/275https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/170/275http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/170/275https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/170/275https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/170/275http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/170/275GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/170/275/table1KPF radial velocities for TOI-2374recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[2460254/2460255] Barycentric Julian Date (1)dtime.epochdoubleRVel[15022.08/15037.21] Radial velocitym/sspect.dopplerVelocdoublee_RVel[1.65/2.98] Uncertainty in RVelm/sstat.error;spect.dopplerVelocfloat