J/ApJ/897/159ivo://CDS.VizieR/J/ApJ/897/159doi:10.26093/cds/vizier.18970159CDSPellegrino C.Howell D.A.Sarbadhicary S.K.Burke J.Hiramatsu D.,McCully C.Milne P.A.Andrews J.E.Brown P.Chomiuk L.Hsiao E.Y.,Sand D.J.Shahbandeh M.Smith N.Valenti S.Vinko J.Wheeler J.C.,Wyatt S.Yang Y.2022-03-16T12:28:33Z2021-10-14T08:22:20ZCDS support team

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

cds-question@unistra.frsupernovaeinfrared-photometryvisible-astronomybroad-band-photometryWe present multiwavelength photometric and spectroscopic observations of SN 2019ein, a high-velocity Type Ia supernova (SNIa) discovered in the nearby galaxy NGC5353 with a two-day nondetection limit. SN 2019ein exhibited some of the highest measured expansion velocities of any SNIa, with a SiII absorption minimum blueshifted by 24000km/s at 14days before peak brightness. More unusually, we observed the emission components of the PCygni profiles to be blueshifted upward of 10000km/s before B-band maximum light. This blueshift, among the highest in a sample of 28 other SNeIa, is greatest at our earliest spectroscopic epoch and subsequently decreases toward maximum light. We discuss possible progenitor systems and explosion mechanisms that could explain these extreme absorption and emission velocities. Radio observations beginning 14days before B-band maximum light yield nondetections at the position of SN2019ein, which rules out symbiotic progenitor systems, most models of fast optically thick accretion winds, and optically thin shells of mass<~10^-6^M{odot} at radii <100au. Comparing our spectra to models and observations of other high-velocity SNeIa, we find that SN2019ein is well fit by a delayed-detonation explosion. We propose that the high emission velocities may be the result of abundance enhancements due to ejecta mixing in an asymmetric explosion, or optical depth effects in the photosphere of the ejecta at early times. These findings may provide evidence for common explosion mechanisms and ejecta geometries among high-velocity SNeIa.2020ApJ...897..159Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/897/159CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/183 : UBVRI Photometric Standards (Landolt 1992)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)J/AJ/131/1648 : Type Ia supernovae at high and low redshifts (Blondin+,2006)J/ApJ/699/L139 : Spectral parameters of SNe Ia (Wang+, 2009)J/A+A/523/A7 : Light curves of type Ia supernovae in SNLS (Guy+, 2010)J/AJ/143/126 : Spectroscopy of 462 nearby TypeIa supernovae (Blondin+,2012)J/ApJ/745/74 : Pre-maximum spectra of type Ia SNe (Folatelli+, 2012)J/MNRAS/425/1789 : Berkeley supernova Ia program. I. (Silverman+, 2012)J/A+A/554/A27 : 2011fe spectrophotometric time series (Pereira+, 2013)J/other/Sci/340.170 : Classifications of 188 SNe Ia (Wang+, 2013)J/A+A/568/A22 : Joint analysis of the SDSS-II & SNLS SNe Ia (Betoule+, 2014)J/MNRAS/444/3258 : Velocities and EW of PTF SNe Ia (Maguire+, 2014)J/MNRAS/448/2766 : Strong lines in the optical/NIR for SN2002bo (Blondin+,2015)J/A+A/578/A9 : Optical and NIR spectra of SN iPTF13ebh (Hsiao+, 2015)J/MNRAS/459/3939 : Type II supernova light curves (Valenti+, 2016)J/ApJ/876/85 : HST observations for LMC Cepheids (Riess+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/897/159https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/897/159http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/897/159https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/897/159https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/897/159http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/897/159GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/ApJ/897/159/tablea1Optical Photometry of SN 2019einrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[58605/58723] Modified Julian date of observation; MJD-2400000.5dtime.epochfloatUmag[13.7425/17.3706]? The U band magnitudemagphot.mag;em.opt.Ufloatnullablee_Umag[0.0125/0.2996]? The one sigma error in Umagmagstat.error;phot.magfloatnullableBmag[14.0571/18.2981]? The B band magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag[0.006/0.2658]? The one sigma error in Bmagmagstat.error;phot.magfloatnullableVmag[13.9958/17.9068]? The V band magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag[0.0044/0.0661]? The one sigma error in Vmagmagstat.error;phot.magfloatnullablegmag[13.9363/17.9154]? The g band magnitudemagphot.mag;em.opt.Vfloatnullablee_gmag[0.0039/0.0323]? The one sigma error in gmagmagstat.error;phot.magfloatnullablermag[13.9681/18.7994] The r band magnitudemagphot.mag;em.opt.Rfloate_rmag[0.004/0.0359] The one sigma error in rmagmagstat.error;phot.magfloatimag[14.6078/19.0979]? The i band magnitudemagphot.mag;em.opt.Ifloatnullablee_imag[0.0046/0.0471]? The one sigma error in imagmagstat.error;phot.magfloatnullable