J/ApJ/957/100ivo://CDS.VizieR/J/ApJ/957/100CDSGangopadhyay A.Maeda K.Singh A.N. A JNakaoka T.Kawabata K.S.,Taguchi K.Singh M.Chandra P.Ryder S.D.Dastidar R.Yamanaka M.,Kawabata M.Alsaberi R.Z.E.Dukiya N.Teja R.S.Ailawadhi B.,Dutta A.Sahu D.K.Moriya T.J.Misra K.Tanaka M.Chevalier R.,Tominaga N.Uno K.Imazawa R.Hamada T.Hori T.Isogai K.2026-03-02T06:25:50Z2026-02-04T14:59:57ZCDS support team

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

cds-question@unistra.frvisible-astronomyspectroscopysupernovaeWe present optical, near-infrared, and radio observations of supernova (SN) SN IIb 2022crv. We show that it retained a very thin H envelope and transitioned from an SN IIb to an SN Ib; prominent H{alpha} seen in the pre-maximum phase diminishes toward the post-maximum phase, while HeI lines show increasing strength. SYNAPPS modeling of the early spectra of SN 2022crv suggests that the absorption feature at 6200{AA} is explained by a substantial contribution of H{alpha} together with SiII, as is also supported by the velocity evolution of H{alpha}. The light-curve evolution is consistent with the canonical stripped-envelope SN subclass but among the slowest. The light curve lacks the initial cooling phase and shows a bright main peak (peak M_V_=-17.82{\pm}0.17mag), mostly driven by radioactive decay of ^56^Ni. The light-curve analysis suggests a thin outer H envelope (Menv~0.05M_{sun}_) and a compact progenitor (Renv~3R_{sun}_). An interaction-powered synchrotron self-absorption model can reproduce the radio light curves with a mean shock velocity of 0.1c. The mass-loss rate is estimated to be in the range of (1.9-2.8)x10^-5^M_{sun}_/yr for an assumed wind velocity of 1000km/s, which is on the high end in comparison with other compact SNe IIb/Ib. SN 2022crv fills a previously unoccupied parameter space of a very compact progenitor, representing a beautiful continuity between the compact and extended progenitor scenario of SNe IIb/Ib.2023ApJ...957..100Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/957/100CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+AS/135/391 : VI CCD photometry of NGC 6553 (Sagar+ 1999)J/MNRAS/389/955 : u'BVg'r'i'z' light curves of SN 2008ax (Pastorello+, 2008)J/MNRAS/383/1485 : BVRI light curves of SN 2003jd (Valenti+, 2008)J/ApJ/702/226 : Swift/UVOT panchromatic obs. of SN 2008D (Modjaz+, 2009)J/ApJ/741/97 : Light curves of Ibc supernovae (Drout+, 2011)J/MNRAS/416/3138 : SN 2009jf light curves (Valenti+, 2011)J/MNRAS/431/308 : SN 2011fu BVRI light curves (Kumar+, 2013)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)J/ApJ/908/75 : Radio fluxes of type Ib/c & II SNe (Bietenholz+, 2021)J/ApJ/927/61 : Spectroscopic follow-up of Type Ib SN 2017iro (Kumar+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/957/100https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/957/100http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/957/100https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/957/100https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/957/100http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/957/100GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/957/100/table8Log of spectroscopic observations of SN 2022crvrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPhase[-15.3/33.3] Phase measured with respect to the V-band maximum (JD 2459644.19)dtime.phasefloatTelTelescope (Seimei, HCT, DOT or Gemini-North)meta.id;instr.telcharInstInstrumentmeta.id;instrcharlam1[3400/4100] Lower range of wavelength in Angstrom0.1nmem.wl;stat.minintlam2[6840/9500] Upper range of wavelength in Angstrom0.1nmem.wl;stat.maxintDateObservation date (UT)time.epoch;obscharFileFilename; see subdirectory "sp"meta.id;meta.filecharspInteractive spectrum plotmeta.ref.urlchar