Stripped-envelope core-collapse supernovae Maximilian Stritzinger Overview of CSP-I SN Ib/c sample • • • • Photometry paper (3 Figs; MS et al.) Reddening paper (21 Figs; MS, Taddia et al.) Light curve analysis (20 Figs; Taddia , MS et al.) Spectroscopy analysis (16 Figs; Holmbo, Hsiao et al.) @yuribeletskyphoto SUPERNOVAE THROUGH THE AGES Slide 1/10 Los Astronomers de CSP-I PI M. M Phillips Core group C. R. Burns C. Contreras G. Folatelli E. Y. Hsiao N. Morrell M. S. N. B. Suntzeff Co-Is W. Freedman M. Hamuy E. Persson M. Roth B. Madore K. Krisciunas Assistance Wojtek J. Anais L. Boldt L. Busta A. Campillay S. Castellon C. Corco C. Gonzalez E. Heinrich-Josties W. Krzeminski F. Salgado J. Seron S. Torres-Robledo etc…. External Collaborators of this project J. Anderson (ESO) M. Bersten (Un. of La Plata) P. Hoeflich (FSU) S. Holmbo (Aarhus Un.) F. Taddia (Stockholm Un.) Slide 2/10 Slide 3/10 The CSP-I SN Ib/c sample • CSP-I: five 9-month campaigns between 2004-2009 • Follow-up of objects discovered by targeted transient searches • Red-shift range for the majority of objects: 0.01 < z < 0.03 • ugriBV imaging of 34 objects ≈ 2980 individual points • YJH imaging of 25 objects ≈ 580 individual points • 20 SN have pre-maximum optical coverage with 12 beginning -5d before Bmax • 15 SN have pre-maximum near-IR observations with 12 beginning -5d before Jmax • 150 visual-wavelength spectra of 36 objects Swope 1-m Du Pont 2.5-m Magellan 6.5-m Light cur ve examples Slide 4/10 Estimating host-reddening parameters I. Intrinsic E(V-X) color-curve templates (cf. Drout et al. 2011; Dessart et al. 2016) Rest-frame days since Vmax Slide 5/10 AV and RV from Fitzpatrick et al. 1999 reddening law fits to E(V-Xλ) vs. λ Wavelength λ [μm] Estimating reddening parameters II. Distribution of AV values Slide 6/10 A step further J-H vs. B-V color curves • Ic tend to occur in more dusty environments compared to IIb and Ib Slide 7/10 Light cur ve analysis I. Absolute magnitude LCs LCs, normalized to peak & Contardo fits over-plotted u −1 9 B g −1 8 −1 7 −1 6 −1 5 −1 4 −1 3 −1 2 V −1 9 r i J H M [m ag] −1 8 −1 7 −1 6 −1 5 −1 4 −1 3 IIb Ib Ic Ic −BL −1 2 Y −1 9 −1 8 −1 7 −1 6 −1 5 Rest-frame days since mpeak 0 9 bb 0 9 dp 0 9 dt −1 4 −1 3 −1 2 −2 0 à Construction of LC templates à Complete Light curve parameter study LC shape parameters via Contardo fits, timing of maxima, distributions of peak MX, decline-rates vs. brightness & late-time LC slopes,… 04ew 04ex 0 4 fe 0 4 ff 0 4 gq 0 4 gt 0 4 gv 05Q 0 5 aw 0 5 bj 05em 06T 0 6 ba 0 6 bf 06ep 0 6 fo 0 6 ir 0 6 lc 07C 07Y 0 7 ag 07hn 0 7 kj 0 7 rz 0 8 aq 0 8 gc 08hh 09K 09Z 0 20 40 60 8 0 1 0 0 1 2 0 −2 0 0 20 40 60 8 0 1 0 0 1 2 0 −2 0 Re s t −fram e day s s in c e m 0 m ax 20 40 60 80 100 120 Rest-frame days since mpeak Slide 8/10 Light cur ve analysis II. u- to H-band bolometric LCs 56Ni=0.1-0.3 Explosion Parameter estimates via velocity, Arnett’s equations & Bersten modeling M☉ • Comparison of techniques, results, and dependence on model assumptions Spectroscopy PCA (principle component analysis) Slide 9/10 • Black mean spectra, shaded regions are projections of the PCs from the mean spectra • The projections shows a quarter circle trend for Ib & Ic and a more random distribution for IIb • Are there discrete groups or a continuum between the groups? (improved classification) • Simplified correlations between PCA indicators with other SN properties Wavelength [Å] PC1 He I Model spectra PC0 = H-I and PC1 = He-I λ6678 PC0: HI Conclusion Slide 10/10 • CSP-I SE SN sample: unique & quite accurate photometric measurements i) extends from u to H band ii) obtained on a well-understood photometric system • Devise methods to estimate host-reddening, and in some cases, RV à SN Ic appear to occur in more dusty environment • Detailed analysis → LC templates, SEDs, bolometric LC & estimates of explosion parameters • Spectroscopic PCA analysis: a window for classification & SN physics • Future: CSP-II SE SN sample of ∼20 objects along with ∼100 near-IR spectra Thank You @yuribeletskyphoto CSP-II: Poster on SN 2016adj in Centaurus A Bonus slide