J/ApJ/898/166ivo://CDS.VizieR/J/ApJ/898/166doi:10.26093/cds/vizier.18980166CDSJacobson-Galan W.V.Margutti R.Kilpatrick C.D.Hiramatsu D.Perets H.,Khatami D.Foley R.J.Raymond J.Yoon S.-C.Bobrick A.Zenati Y.,Galbany L.Andrews J.Brown P.J.Cartier R.Coppejans D.L.,Dimitriadis G.Dobson M.Hajela A.Howell D.A.Kuncarayakti H.,Milisavljevic D.Rahman M.Rojas-Bravo C.Sand D.J.Shepherd J.,Smartt S.J.Stacey H.Stroh M.Swift J.J.Terreran G.Vinko J.,Wang X.Anderson J.P.Baron E.A.Berger E.Blanchard P.K.Burke J.,Coulter D.A.DeMarchi L.DerKacy J.M.Fremling C.Gomez S.,Gromadzki M.Hosseinzadeh G.Kasen D.Kriskovics L.McCully C.,Muller-Bravo T.E.Nicholl M.Ordasi A.Pellegrino C.Piro A.L.Pal A.,Ren J.Rest A.Rich R.M.Sai H.Sarneczky K.Shen K.J.Short P.,Siebert M.R.Stauffer C.Szakats R.Zhang X.Zhang J.Zhang K.2022-03-21T09:18:33Z2021-12-17T13:23:48ZCDS support team

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

cds-question@unistra.frsupernovaeinfrared-astronomyspectroscopyinfrared-photometryvisible-astronomybroad-band-photometryWe present panchromatic observations and modeling of the Calcium-rich supernova (SN) 2019ehk in the star-forming galaxy M100 (d~16.2Mpc) starting 10hr after explosion and continuing for ~300days. SN 2019ehk shows a double-peaked optical light curve peaking at t=3 and 15days. The first peak is coincident with luminous, rapidly decaying Swift-XRT-discovered X-ray emission (L_x_~10^41^erg/s at 3days; Lx{propto}t^-3^), and a Shane/Kast spectral detection of narrow H{alpha} and HeII emission lines (v~500km/s) originating from pre-existent circumstellar material (CSM). We attribute this phenomenology to radiation from shock interaction with extended, dense material surrounding the progenitor star at r<10^15^cm and the resulting cooling emission. We calculate a total CSM mass of ~7x10^-3^M_{sun}_ (M_He_/M_H_~6) with particle density n~10^9^cm^-3^. Radio observations indicate a significantly lower density n<10^4^cm^-3^ at larger radii r>(0.1-1)x10^17^cm. The photometric and spectroscopic properties during the second light-curve peak are consistent with those of Ca-rich transients (rise-time of t_r_=13.4!+/-0.210days and a peak B-band magnitude of M_B_=-15.1+/-0.200mag). We find that SN 2019ehk synthesized (3.1+/-0.11)x10^-2^M_{sun}_ of ^56^Ni and ejected M_ej_=(0.72+/-0.040)M_{sun}_ total with a kinetic energy E_k_=(1.8+/-0.10)x10^50^erg. Finally, deep HST pre-explosion imaging at the SN site constrains the parameter space of viable stellar progenitors to massive stars in the lowest mass bin (~10M_{sun}_) in binaries that lost most of their He envelope or white dwarfs (WDs). The explosion and environment properties of SN 2019ehk further restrict the potential WD progenitor systems to low-mass hybrid HeCO WD+CO WD binaries.2020ApJ...898..166Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/898/166CatalogResearchIsServedByTAP VizieR generic servicerelated-toVIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+ 2005)J/MNRAS/383/1485 : BVRI light curves of SN 2003jd (Valenti+, 2008)J/ApJ/692/L84 : Photometry of SN 2008D (Malesani+, 2009)J/ApJ/702/226 : Swift/UVOT panchromatic obs. of SN 2008D (Modjaz+, 2009)J/AJ/139/120 : Low-redshift Type-Ia supernovae (Folatelli+, 2010)J/ApJ/742/L18 : Follow-up photometry of the SN IIb PTF 11eon (Arcavi+, 2011)J/ApJ/749/177 : Yellow and red supergiants in the LMC (Neugent+, 2012)J/MNRAS/425/1789 : Berkeley supernova Ia program. I. (Silverman+, 2012)J/MNRAS/428/729 : GRB Swift X-ray light curves analysis (Margutti+, 2013)J/MNRAS/438/L101 : First month on SN 2013ej (Valenti+, 2014)J/A+A/579/A40 : PESSTO catalog (Smartt+, 2015)J/ApJ/821/57 : Photometry of the Type Ib/c SN2013ge (Drout+, 2016)J/A+A/593/A68 : PTF12os and iPTF13bvn spectra & LCs (Fremling+, 2016)J/ApJ/836/60 : Bgri light curves of PTF11kmb and PTF12bho (Lunnan+, 2017)J/ApJ/855/107 : PMAS Integral-field SN hosts COmpilation (Galbany+, 2018)J/ApJ/867/105 : ATLAS all-sky stellar ref. cat. ATLAS-REFCAT2 (Tonry+, 2018)J/A+A/630/A76 : SN2016hnk photometry and spectroscopy (Galbany+, 2019)J/ApJ/887/169 : UV-Opt light curves of the type Ic SN 2018gep (Ho+, 2019)J/ApJ/896/165 : Optical light curves of SN 2016hnk (Jacobson-Galan+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/898/166https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/898/166http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/898/166https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/898/166https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/898/166http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/898/166GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/ApJ/898/166/tablea10Optical photometry of SN 2019ehkrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[58573.46/58699.26] Modified Julian Datedtime.epochdoublePhase[-41.7/84.11] Phase (1)time.phasefloatFiltFilter used (ugriz, M2W1W2UBV, c, o)instr.setup;instr.filtercharl_magLimit flag on magmeta.code.errorcharmag[15.41/24.0]? Apparent magnitude in Filtmagphot.magfloatnullablee_mag[0.0/1.96]? Uncertainty in magmagstat.error;phot.magfloatnullableInstInstrument (2)meta.id;instrcharJ/ApJ/898/166/tablea9Optical spectroscopy of SN 2019ehkrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUT date of observationtime.epoch;obsnullableMJD[58603.3/58872.1] Modified Julian Datedtime.epochfloatPhase[-12/257] Phase relative to second B-band maximum (MJD 58615.156)dtime.phasefloatTelTelescope (1)meta.id;instr.telcharInstInstrumentmeta.id;instrcharlam1Lower wavelength range0.1nmem.wl;stat.minintlam2Upper wavelength range0.1nmem.wl;stat.maxintSpInteractive plot of spectrummeta.ref.urlcharJ/ApJ/898/166/fig34Spectral observations of SN 2019ehkrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateObservation date; UTtime.epoch;obsnullableindexedInstInstrument (1)meta.id;instrcharlambda[3150/11300] Wavelength; Angstroms0.1nmem.wldoubleFluxFlux density in erg/s/cm^2^/{AA} unitscW.m**-2.nm**-1meta.unit;phot.flux.densitydoubleJ/ApJ/898/166/fig5SOAR Triple Spec NIR spectrum of SN 2019ehk on MJD 58655.9 or +38d relative to second B-band peakrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[0.94/2.5] Wavelengthumem.wldoubleFlux[-7.9e-16/1.2e-15] Flux density in erg/s/cm^2^/{AA} unitscW.m**-2.nm**-1meta.unit;phot.flux.densitydouble