J/ApJ/903/132ivo://CDS.VizieR/J/ApJ/903/132doi:10.26093/cds/vizier.19030132CDSHoresh A.Sfaradi I.Ergon M.Barbarino C.Sollerman J.MoldonJ.Dobie D.Schulze S.Perez-Torres M.Williams D.R.A.Fremling C.,Gal-Yam A.Kulkarni S.R.O'Brien A.Lundqvist P.Murphy T.Fender R.,Anand S.Belicki J.Bellm E.C.Coughlin M.W.De K.Golkhou V.Z.GrahamM.J.Green D.A.Hankins M.Kasliwal M.Kupfer T.Laher R.R.MasciF.J.Miller A.A.Neill J.D.Ofek E.O.Perrott Y.Porter M.ReileyD.J.Rigault M.Rodriguez H.Rusholme B.Shupe D.L.Titterington D.2022-03-14T06:30:20Z2022-02-25T06:34:10ZCDS support team

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

cds-question@unistra.frsupernovaeradio-spectroscopyvisible-astronomyspectroscopyx-ray-sourcesWe report the discovery and panchromatic follow-up observations of the young Type Ic supernova (SNIc) SN2020oi in M100, a grand-design spiral galaxy at a mere distance of 14Mpc. We followed up with observations at radio, X-ray, and optical wavelengths from only a few days to several months after explosion. The optical behavior of the supernova is similar to those of other normal SNeIc. The event was not detected in the X-ray band but our radio observations revealed a bright mJy source (L_{nu}_~1.2x10^27^erg/s/Hz). Given the relatively small number of stripped envelope SNe for which radio emission is detectable, we used this opportunity to perform a detailed analysis of the comprehensive radio data set we obtained. The radio-emitting electrons initially experience a phase of inverse Compton cooling, which leads to steepening of the spectral index of the radio emission. Our analysis of the cooling frequency points to a large deviation from equipartition at the level of {epsilon}_e_/{epsilon}_B_>~200, similar to a few other cases of stripped envelope SNe. Our modeling of the radio data suggests that the shock wave driven by the SN ejecta into the circumstellar matter (CSM) is moving at ~3x10^4^km/s. Assuming a constant mass loss from the stellar progenitor, we find that the mass-loss rate is M~1.4x10^-4^M{sun}/yr for an assumed wind velocity of 1000km/s. The temporal evolution of the radio emission suggests a radial CSM density structure steeper than the standard r-2.2020ApJ...903..132Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/903/132CatalogResearchIsServedByTAP VizieR generic servicerelated-toVIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)J/MNRAS/397/1177 : Swift-XRT observations of GRBs (Evans+, 2009)J/other/Nat/463.513 : Radio observations of SN 2009bb (Soderberg+, 2010)J/ApJ/760/L33 : Photometry of the Ic supernova PTF12gzk (Ben-Ami+, 2012)J/MNRAS/429/3330 : AMI Galactic Plane Survey at 16GHz. I. (Perrott+, 2013)J/A+A/562/A17 : SN 2011dh - The first 100 days (Ergon+, 2014)J/A+A/593/A68 : PTF12os & iPTF13bvn spectra and light curves (Fremling+, 2016)J/A+A/618/A37 : Spectral log of (i)PTF stripped-envelope SN (Fremling+, 2018)J/ApJ/895/32 : Zwicky Transient Facility BTS. I. (Fremling+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/903/132https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/903/132http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/903/132https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/903/132https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/903/132http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/903/132GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapX-rayOpticalMillimeterdefaultJ/ApJ/903/132/table4SN2020oi radio spectral fits and the derived equipartition shockwave parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTime[5/20.4] Time of the peak (1)dtime;arith.difffloate_Time[1/2] Error in Timedstat.error;time.epochfloatPeak[2.21/5.24] Peak fluxmJy/beamphot.fluxfloate_Peak[0.3/0.9] Error in PeakmJy/beamstat.error;stat.maxfloatFreq[5.1/31.4] Frequency of the peakGHzem.freqfloate_Freq[0.3/2]? Error in FreqGHzstat.errorfloatnullableSp+Ind[-1.31/-0.53]? Spectral slopespect.indexfloatnullablee_Sp+Ind[0.1/0.4]? Error in Sp+Indexstat.errorfloatnullablechi[0.02/0.69] Reduced chi squarestat.fit.chi2floatdof[1/9] Degrees of freedomstat.fit.dofintRad[0.59/4.66] Radius of the emitting shell (2)1e+15cmphys.size.radiusfloate_Rad[0.16/0.83] Error in Rad1e+15cmstat.errorfloatB[1.08/3.9] Magnetic field strength (2)phys.atmol.collStrength;obs.fieldfloate_B[0.2/1] Error in Bstat.errorfloatVel[3.9/4.1] Shock velocity (2)10000km.s**-1phys.velocfloate_Vel[0.9/1.3] Error in Velstat.errorfloatMdot[0.8/1.4] Mass-loss rate (2)1e-05solMass.yr**-1arith.ratefloate_Mdot[0.4/1] Error in Mdot1e-05solMass.yr**-1stat.errorfloatJ/ApJ/903/132/table5SN 2020oi VLA sub-band observationsRMS[0.01/0.57] Image RMSmJyinstr.det.noisefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTime[5.15/93.8] Days since the explosiondtime;arith.difffloatFreq[5/47] Observed central frequencyGHzem.freqintFlux[0/5.25] Peak flux density (1)mJy/beamphot.fluxfloate_Flux[0/0.54] Error in Flux (1)mJy/beamstat.error;phot.fluxfloat