J/ApJS/276/3ivo://CDS.VizieR/J/ApJS/276/3doi:10.26093/cds/vizier/bb-8m-3CDSVillar V.A.Gomez S.Berger E.Gagliano A.2026-03-02T20:03:36Z2026-02-16T09:21:02ZCDS support team

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

cds-question@unistra.frsupernovaephotometrystellar-spectral-typesWith the advent of the Vera C. Rubin Observatory, the discovery rate of supernovae (SNe) will surpass the rate of SNe with real time spectroscopic follow-up by 3 orders of magnitude. Accurate photometric classifiers are essential to both select interesting events for follow-up in real time and for archival population-level studies. In this work, we investigate the impact of observable host-galaxy information on the classification of SNe, both with and without additional light-curve and redshift information. We find that host-galaxy information alone can successfully isolate relatively pure (>90%) samples of Type Ia SNe with or without redshift information. With redshift information, we can additionally produce somewhat pure (>70%) samples of Type II SNe and superluminous SNe. Additionally with redshift information, host- galaxy properties do not significantly improve the accuracy of SN classification when paired with complete light curves. In the absence of redshift information, however, galaxy properties significantly increase the accuracy of photometric classification. As a part of this analysis, we present the first formal application of a new objective function, the weighted hierarchical cross entropy, to the problem of SN classification. This objective function more naturally accounts for the hierarchical nature of SN classes and, more broadly, transients. Finally, we present a new set of SN classifications for the Pan-STARRS Medium Deep Survey of SNe that lack spectroscopic redshift, increasing the full photometric sample to >4400 events.2025ApJS..276....3Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/276/3CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/317 : The CFHTLS Survey (T0007 release) (Hudelot+ 2012)J/MNRAS/412/1419 : Nearby supernova rates (Leaman+, 2011)J/MNRAS/424/2841 : Morphology of supernova host galaxies (Habergham+, 2012)J/A+A/544/A81 : Supernovae and their hosts in the SDSS DR8 (Hakobyan+, 2012)J/ApJ/759/107 : Core-collapse SNe and host galaxies (Kelly+, 2012)J/ApJ/7/107 : Host galaxies of SNIa from SNfactory (Childress+, 2013)J/ApJ/905/93 : Classif. of PS1-MDS SNe with Superphot (Hosseinzadeh+, 2020)J/ApJ/905/94 : Classif. for PS1-MDS SNe with SuperRAENN (Villar+, 2020)J/ApJ/912/46 : ZTF Type II supernovae with follow-up obs. (Bruch+, 2021)J/ApJS/255/29 : PTF core-collapse SN host-galaxy sample. I. (Schulze+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/276/3https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/276/3http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/276/3https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/276/3https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/276/3http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/276/3GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/276/3/table2 (Classification probabilities of all SN-like objects in PS1-MDS)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/276/3/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/276/3/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/276/3/table2?GETtext/xml+votable180.050000true150.23111.84540.0055555555555555565/1517 1519 1623 1628-1629 2538-2539 2744-2745 2856 4422-4423 4696-4697 4758-4759 6811 6814 8983 8989 6/6047 6073 6075 6090 6112 6114 6120 6491 6521 6524 7178 7200 10146-10147 10150-10151 10741 10743 10749 10933 10935 10941 10955 10958-10959 10984-10985 10992 11402-11403 11406 11428 11430 11432-11434 11436 11520-11522 11524 17682-17683 17686-17687 17713 17716-17717 18762-18763 18766-18767 18793 18796-18797 19025-19027 19030-19031 19057 19060 27239 27250-27251 27262 27333 27344-27345 27348 35931 35953 36104 36106-36107 36128-36130https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/276/3?format=asciidefaultJ/ApJS/276/3/table2Classification probabilities of all SN-like objects in PS1-MDSrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSupernova namemeta.id;meta.maincharp(Ia)[0/1] Probability of Type Ia classificationmeta.code.class;stat.probabilityfloate_p(Ia)[0/0.51] Uncertainty in p(Ia)stat.error;meta.code.class;stat.probabilityfloatp(CC)[0/1] Probability of core-collapse classificationmeta.code.class;stat.probabilityfloate_p(CC)[0/0.51] Uncertainty in p(CC)stat.error;meta.code.class;stat.probabilityfloatp(H-rich)[0/1] Probability of hydrogen-rich classificationmeta.code.class;stat.probabilityfloate_p(H-rich)[0/0.47] Uncertainty in p(H-rich)stat.error;meta.code.class;stat.probabilityfloatp(H-poor)[0/1] Probability of hydrogen-poor classificationmeta.code.class;stat.probabilityfloate_p(H-poor)[0/0.48] Uncertainty in p(H-poor)stat.error;meta.code.class;stat.probabilityfloatp(SLSN)[0/1] Probability of superluminous supernova classificationmeta.code.class;stat.probabilityfloate_p(SLSN)[0/0.45] Uncertainty in p(SLSN)stat.error;meta.code.class;stat.probabilityfloatp(II)[0/0.91] Probability of Type II classificationmeta.code.class;stat.probabilityfloate_p(II)[0/0.39] Uncertainty in p(II)stat.error;meta.code.class;stat.probabilityfloatp(IIn)[0/0.86] Probability of Type IIn classificationmeta.code.class;stat.probabilityfloate_p(IIn)[0/0.41] Uncertainty in p(IIn)stat.error;meta.code.class;stat.probabilityfloatp(Ibc)[0/0.92] Probability of Type Ibc classificationmeta.code.class;stat.probabilityfloate_p(Ibc)[0/0.42] Uncertainty in p(Ibc)stat.error;meta.code.class;stat.probabilityfloatH20Display data from Hosseinzadeh+ 2020, J/ApJ/905/93meta.ref.urlintnullable_RAPositions from Villar+ 2020, J/ApJ/905/94 (right ascension part)degpos.eq.ra;meta.main_DEPositions from Villar+ 2020, J/ApJ/905/94 (declination part)degpos.eq.dec;meta.main