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Photometric Observations of SN 2002er in UGC 10743

Detailed observations of SN 2002er from pre-maximum to post-maximum using multiple instruments, revealing unique color curves and reddening effects. Key findings and future analysis discussed.

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Photometric Observations of SN 2002er in UGC 10743

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  1. OSSERVATIONS OF SN 2002er Giuliano Pignata ESO – Universitá di Padova Ringberg March 10-15, 2003

  2. SN 2002er IN UGC 10743 Discovered on August 23.2 IAUC 7959 (Wood-Vasey et al.) RA = 17 11 29.88 DE = 07 59 44.8 Classified on August 26.9 IAUC 7961 (Smartt et al.) Vr = 2568 Km/sec Ringberg March 10-15, 2003

  3. PHOTOMETRIC OBSERVATIONS 45 epochs from 7 days before B maximum to 40 days after 9 instruments used Quite good agreement between the different measurements with some exceptions !! Ringberg 2003 March 10-15

  4. THE INSTRUMENTS AF = 1.8m+AFOSC DF = 1.5m+DFOSC WM = 0.8m+MONICA V B-V = -0.298 • CS =2.2m+CAFOS+LORAL I R-I = 0.236 CS =2.2m+CAFOS+SITE  I R-I = 0.209 SS = SSO 2.3m JJ= 1.0m(JKT)+JAG TD = TNG+DOLORES Ringberg 2003 March 10-15 TD = 3.5m+MOSCA

  5. LIGHT CURVES Umax (0) = 14.72 ± 0.03 Bmax (0) = 14.88 ± 0.02 Vmax (+4) = 14.58 ± 0.03 Rmax (+4) = 14.42 ± 0.03 Imax (-1) = 14.44 ± 0.03 Δm15(B)obs = 1.26 ± 0.04 Δm15(B)true = 1.29 ± 0.04 Ringberg 2003 March 10-15

  6. Δm15(B) true (Phillips et al. 1999) RB = AB/E(B-V) AB is function of the SNphase Δm15(B) true Δm15(B) obs + 0.1·E(B-V) Ringberg 2003 March 10-15

  7. COLOR CURVES (U-B ) max = -0.16 (B-V) max = 0.23 Ringberg 2003 March 10-15

  8. COLOR CURVES (V-R) max = 0.19 (V-I) max = -0.02 Ringberg 2003 March 10-15

  9. REDDENING E(B-V)MW = 0.16 (Schlegel et al. 1998) E(B-V)host ~ E(B-V)MW E(B-V)tot~ 0.30 IAU 7061 (Smartt, S. J. Patat, F. Meikle, P.) Equivalent width of the Na I D line host galaxy is 0.11 ± 0.01 Equivalent width of the Na I D line Milky Way is 0.12 ± 0.01 Ringberg 2003 March 10-15

  10. REDDENING E(B-V)tail = 0.40 ± 0.06 Lira 1995 Only 4 points between phase 30 and 90 E(B -V)tail not well estimated E(B-V)max = 0.28 ± 0.03 Phillips et al. 1999 E(B-V)wang = 0.25 ± 0.04 Wang et al. 2003 More and independent information on the reddening will come from the synthetic spectra analysis (Mazzali) Ringberg 2003 March 10-15

  11. E(B-V)FROM LIRA RELATION (B-V)0 = 0.725 – 0.0118 · (tv – 60) E(B-V)tail = (B –V)obs – (B-V)0with 30 < tv < 90 SNe with low extinction in the host galaxy, cover a wide range of Δm15 (Phillips et al. 1999)  n = 6 σ = 0.04  Lira 1995 Ringberg 2003 March 10-15

  12. E(B-V) FROM PHILLIPS RELATION SNe with E(B-V)tail < 0.06cover a wide range of Δm15 (Phillips et al. 1999) (Bmax –Vmax)0 = (-0.070 ± 0.012) + (0.114 ± 0.037)·(Δm15(B) –1.1) E(B-V) = (Bmax –Vmax)obs –(Bmax –Vmax)0  n = 14 σ = 0.03  Δm15(B) Ringberg 2003 March 10-15

  13. E(B-V)FROM “CMAGIC” RELATION SNe with (B – V)max< 0.05 cover a wide range of Δm15 (Wang et al. 2003)  ε0 = (-0.118 ± 0.013) + (0.249 ± 0.043) (Δm15 – 1.1) Relation between ε(B-V) and (B – V)max  B = BBV + βBV (B-V)  ε(B-V) = (-0.051 ± 0.011) + (1.000 ± 0.067) (B – V)max E(B-V) = ε(B-V) - ε0 Ringberg 2003 March 10-15

  14. THE ABSOLUTE MAGNITUDE E(B-V) = 0.28  AB = 1.21 ± 0.13 Vr = 2568  μ = 32.79 ± 0.28  Bmax = -19.12 ± 0.31 Δm15 = 1.29 ± 0.04 ( Hamuy et al.1996 )  Bmax = - 19.09 ± 0.33 H0 = 71 ± 4 (Spergel et al. 2003) RB = 4.315 (Schlegel and Douglas 1998 ) Ringberg 2003 March 10-15

  15. CONCLUSIONS • Good photometric coverage, but no excellent absolute calibration • SN 2002er resembles a “normal” type Ia supernova, but some differences arise especially in the I band • More information will come from spectra analysis (Kotak) and bolometric light curve (Stritzinger) Ringberg 2003 March 10-15

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