Infrared Light Curves of Type Ia Supernovae

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Infrared Light Curves ofType Ia Supernovae
M. M. Phillips Las Campanas Observatory Carnegie
Observatories
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• Collaborators
• Carnegie - M. Hamuy, S. Gonzalez, E. Persson,
  M. Roth, W. Freedman
• CTIO - P. Candia, K. Krisciunas, N. Suntzeff
• ESO - L. Germany

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• Campaigns to obtain JHK imaging of SNe at Las
  Campanas Observtory
• March-May 1999 (4 Ia, 2 II)
• October-November 1999 (3 Ia, 1 Ic, 2 II)
• April-May 2000 (4 Ia, 2 II)
• April-June 2001 (4 Ia, 1 Ic, 2 II)

25 SNe observed 15 Ia, 8 II, 2 Ic
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• Outline of Talk
• Morphology of JHK lightcurves
• Reddening
• Absolute magnitudes
• Hubble Diagram
• Interesting SNe Ia (1999aw, 1999ac, 2001ay)

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Sources UBVRI Suntzeff et al.
(1999) JHK Mayya et al. (1998) Jha et al.
(1999) Hernandez et al. (2000)
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Krisciunas et al. (2001)
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Krisciunas et al. (2001)
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Krisciunas et al. (2001)
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Y band at 1.035 µm
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• Morphology of JHK lightcurves
• Primary maxima occur a few days before T(Bmax)
• Secondary maximum occurs later in slower
  declining events
• Secondary maximum can be brighter than primary
  maximum (e.g., in Y H bands)
• H K light curves are relatively flat around
  T(Bmax)

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Phillips et al. (1999)
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SNe Ia with 0.9 lt ?m15(B) lt 1.3 Observed Colors
Krisciunas et al. (2000)
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SNe Ia with 0.9 lt ?m15(B) lt 1.3 Shifted to Av
0 locus
Krisciunas et al. (2000)
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?m15(B) 1.73
V-K
V-K
V-J
?m15(B) 0.85
Krisciunas et al. (2000)
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"Realistic Case" Av (2.60.3) x E(B-V)
"Worst Case" Av (1.1260.072) x E(V-K)
"Best Case" Av (3.10.1) x E(B-V)
Krisciunas et al. (2000)
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• Reddening
• SNe Ia with intermediate decline rates (0.9 lt
  ?m15(B) lt 1.3) appear to have similar V-IR color
  evolution
• As expected, the V-IR color evolution of slower
  and faster declining events differ in a way that
  is yet to be accurately determined
• Use of optical-IR color evolution to determine
  reddening should ultimately prove more precise
  than optical-only colors

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Ho 73 ? 0.09 mag
Ho 71 ? 0.22 mag
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• Absolute Magnitudes
• Hubble Diagram
• The decline rate vs. luminosity relation
  appears to be nearly flat in the H band
• Initial results from 7 SNe Ia with H band
  observations give a Hubble constant (Ho 71)
  consistent with that derived from optical data
  (Ho 73) using the Key Project Cepheid
  calibration

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SN 1999aw z 0.038 Strolger et al. (2002)
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Mv(host) -12.5 0.2 !
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Dashed lines correspond to a "typical" SN Ia with
?m15(B) 1.10
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SN 1999ac in NGC 6063
Phillips et al. (in preparation)
Color image by Nick Suntzeff
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SN 2001ay in IC 4423
SN
J image obtained with LCO 2.5m on 2001 Jun 7
KAIT Discovery Image
Discovered with LOTOSS on 2001 Apr 18
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SN 2001ay Maximum Light Spectrum
"CfA Supernova Nexus"
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Dashed lines correspond to a "typical" SN Ia with
?m15(B) 1.10
?m15(B) 0.6 !
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E(B-V)host 0.0
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E(B-V)host 0.2
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E(B-V)host 0.0
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E(B-V)host 0.2