SN 1999aa Ia in NGC 2595

OBJECT:  SN 1999aa Ia in NGC 2595 (SABc galaxy) which in Leda is
         NGC 2595 (Leda).  
DISCOVERY:  1999feb11 UT by Armstrong & Schwartz and others. 
MAXIMUM:  Bmax 1999feb23.5  (JD 2451233.0) (jha2006, p. 549) 
               1999feb22.87 (JD 2451232.37 +/- .23) (krisciunas2000, p. 667)
               1999feb24.5 (JD 2451234. or so) (garavini2004, but it's not clear).
               1999feb26 (JD 2451235.5) according to the SUSPECT headers.
          Let's use krisciunas2000 value since they seem confident.
          See the US Navy Observatory Julian Date Converter.
          This day of the year 57.
SUPERNOVA of the YEAR:  M = 27.

HEADER:  Header Common header information for this supernovae.
         The common header may (or may not) be updated relative to the header information here 
         (D. J. Jeffery (2006jan01)).

COMMENT:  A shallow silicon (SS) SN Ia.

REFERENCES:

       CfA List of Supernovae
       where SN 1999aa is noted.

       CfA Supernova Archive
       This has 0 SN 1999aa spectra, but there is photometry in jha2006.

       conley2006 General value
       of 19.4 days for Ia rise time in B.

       garavini2004 Specifically on SN 1999aa.
       There seem to be anomalies in the Table 1 spectroscopy log published in Garavini et al.
       and in the header information that we were given for SUSPECT.  
       One anomaly is that most of the JDs given in Table 1 of Garavini et al. seem offset by 2 days from the header
       information in SUSPECT.  For example, the earliest SUSPECT spectrum date is given as feb15, but the
       Table 1 JD is corresponds to feb13.  
       Also the 5 and 6 entries for JDs are the same.  
       Another problem is that I'm not able to deduce from Table 1 what date for B maximum was adopted and this
       value doesn't seem mentioned in the paper anywhere.
       It doesn't seem to the value of Krisciunas et al. (2000)
       which would make the first spectrum either of day -9 (for a feb13 date)
       or -7 (for feb15 date) relative to maximum light and not day -11
       as specified in Table 1.

       jha2006 Gives 
       SN 1999aa B max date of JD 2451233.0 and these guys are also light curve experts.

       krisciunas2000 Gives a precise
       SN 1999aa B max date of JD 2451232.37 +/- .23. 

       paturel2003 (Leda) Leda refererence.

       SUSPECT Index.

       SUSPECT Index:  SN 1999aa Ia.
       There are 15 SN 1999aa spectra from garavini2004.  


CORRECTIONS:  Heliocentric velocity 4333 +/- 4 km/s [2007jun27] from
              NGC 2595 (Leda).
              Galactic foreground reddening 0.17/4=.0425 from
              NGC 2595 (Leda).
              This is derived from
              Schlegel et al. (1998)



OBSERVATIONS:  From
               1) SUSPECT:  all garavini2004 spectra. 
               2) Eddie Baron:  none.
               3) David Branch /home/branch/synow/99aa:  there seem to be 2 or 3 spectra from
                  some other source, including a really early one, but no information about them.

SPECTRUM LOG:  The phases are from garavini2004 and the dates from the SUSPECT headers.
               Some of the phases must be wrong by a day or tow, but there is no
               consistent correction scheme that I can find.
               Some member of garavini2004 will have to supply corect phases for the spectra.
   

         Spectrum               Date                  Phase relative to Bmax     Rest Wavelength Range
         garavini2004           1999feb15             -11                        3503.272--9294.628585
         garavini2004           1999feb19              -7                        3686.22--10267.304625
         garavini2004           1999feb25              -1                        3279.914--10295.4071
         garavini2004           1999mar04               6                        3870.765--8806.08055
         garavini2004           1999mar17              19                        3351.962--9994.177517


&specnamelist
   aname='sn1999aa Ia 1999_02_'
   ebv=.0425         ! 
   epoch=            ! This parameter needs to updated for the particular spectrum.
   idifmake=0
   iformat=-1        ! The start and end wavelengths are consistent with deredshifted from garavini2004.
   ismooth=0
   itick=2
   itickln=4
   t_rise=19.4d0   ! conley2006:  just an average rise time. 
   v_helio=4333.
   ymin2=.2d-16
   ymax2=100.d-16
   ymin3=.3
   ymax3=3.
   wlammin1=
   wlammax1=
   wlammin2=
   wlammax2=
   wlammin3=
   wlammax3=
/




      

Postscript plot of the spectrum.




      

Postscript plot of the spectrum with local normalization.




Information from someone and somewhere: