J/ApJ/896/165ivo://CDS.VizieR/J/ApJ/896/165doi:10.26093/cds/vizier.18960165CDSJacobson-Galan W.V.Polin A.Foley R.J.Dimitriadis G.Kilpatrick C.D.,Margutti R.Coulter D.A.Jha S.W.Jones D.O.Kirshner R.P.Pan Y.-C.,Piro A.L.Rest A.Rojas-Bravo C.2021-12-03T13:26:38Z2021-11-30T08:20:04ZCDS support team

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

cds-question@unistra.frphotometryvisible-astronomysupernovaeWe present observations and modeling of SN 2016hnk, a Ca-rich supernova (SN) that is consistent with being the result of a He-shell double-detonation explosion of a C/O white dwarf. We find that SN2016hnk is intrinsically red relative to typical thermonuclear SNe and has a relatively low peak luminosity (M_B_=-15.4mag), setting it apart from low-luminosity SNe Ia. SN 2016hnk has a fast-rising light curve that is consistent with other Ca-rich transients (t_r_=15days). We determine that SN 2016hnk produced 0.03+/-0.01M_{sun}_ of ^56^Ni and 0.9+/-0.3M_{sun}_ of ejecta. The photospheric spectra show strong, high-velocity CaII absorption and significant line blanketing at {lambda}<5000{AA}, making it distinct from typical (SN 2005E-like) Ca-rich SNe. SN 2016hnk is remarkably similar to SN 2018byg, which was modeled as a He-shell double-detonation explosion. We demonstrate that the spectra and light curves of SN 2016hnk are well modeled by the detonation of a 0.02M_{sun}_ helium shell on the surface of a 0.85M_{sun}_ C/O white dwarf. This analysis highlights the second observed case of a He-shell double-detonation and suggests a specific thermonuclear explosion that is physically distinct from SNe that are defined simply by their low luminosities and strong [CaII] emission.2020ApJ...896..165Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/896/165CatalogResearchIsServedByTAP VizieR generic servicerelated-toV/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)J/PASP/117/773 : Classif. of SN host galaxies. III (van den Bergh+, 2005)J/AJ/137/3731 : ESSENCE high-redshift supernova (Foley+, 2009)J/MNRAS/417/2230 : BVRI+SDSS+2MASS and WISE phot. of 289 stars (Bilir+, 2011)J/MNRAS/425/1789 : Berkeley supernova Ia program. I. (Silverman+, 2012)J/A+A/573/A2 : SN 2012Z spectra (Stritzinger+, 2015)J/ApJ/836/60 : Bgri light curves of PTF11kmb and PTF12bho (Lunnan+, 2017)J/ApJ/841/48 : UBVR and IR photometry of SN 2011fe (Ia) (Shappee+, 2017)J/MNRAS/475/193 : Foundation SN Survey first data release (Foley+, 2018)J/A+A/630/A76 : SN2016hnk photometry and spectroscopy (Galbany+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/896/165https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/896/165http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/896/165https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/896/165https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/896/165http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/896/165GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/896/165/table1Optical photometry of SN 2016hnkrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[57659.57/57981.54] Modified Julian Date of the observationdtime.epochdoublePhase[-30.63/291.34] Time since B band maximum; MJD 57690.18dtime.intervalfloatFiltFilter used (ugriz, BVRI, "cyan" or "orange")instr.setup;instr.filtercharl_magLimit flag on magmeta.code.errorcharmag[17.23/23.57] Apparent magnitude in Filtermagphot.magfloate_mag[0.01/0.41]? Uncertanty in magmagstat.error;phot.magfloatnullableInstInstrument used (1)instr.setupchar