M. Stritzinger - Supernovae Through the Ages

Stripped-envelope core-collapse supernovae
Maximilian Stritzinger
Overview of CSP-I SN Ib/c sample
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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
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CSP-I: five 9-month campaigns between 2004-2009
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Follow-up of objects discovered by targeted transient searches
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Red-shift range for the majority of objects: 0.01 < z < 0.03
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ugriBV imaging of 34 objects ≈ 2980 individual points
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YJH imaging of 25 objects ≈ 580 individual points
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20 SN have pre-maximum optical coverage with 12 beginning -5d before Bmax
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15 SN have pre-maximum near-IR observations with 12 beginning -5d before Jmax
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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
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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☉
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Comparison of techniques, results, and
dependence on model assumptions
Spectroscopy PCA (principle component analysis)
Slide 9/10
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Black mean spectra, shaded regions are
projections of the PCs from the mean spectra
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The projections shows a quarter circle
trend for Ib & Ic and a more random
distribution for IIb
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Are there discrete groups or a continuum
between the groups? (improved classification)
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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