SN 2002cx Ia in PGC045981 (CGCG 044-035)

OBJECT:   SN 2002bo Ia in PGC045981 (CGCG 044-035) (S? galaxy) which in Leda is
          PGC045981 (Leda).  
DISCOVERY:  2002may12.2 UT by Woods-Vasey et al. (2002) 
MAXIMUM:  2002may20.7 +/- 1.0 (JD 2452415.2) in B (li2003).
          See the US Navy Observatory 
          Julian Date Converter.
          This day of the year 140.
SUPERNOVA of the YEAR:  M = 102.

HEADER: Header Common header information for this supernovae.
        The common header may (or may not) be updated relative to the header information above
        (D. J. Jeffery (2007jan01)).

COMMENTS:  This is a very peculiar SN Ia.  Maybe the 02cx-likes are a whole separate subtype of Ia's or something
           really non-Ia.  Time will tell.

REFERENCES:

       CfA List of Supernovae
       where SN 2002cx is noted.

       CfA Supernova Archive
       For SN 2002cx, this has 4 spectra (li2003) and 0 photometry.
       The spectra are the 4 earliest ones in li2003.

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

       jha2006a Specifically on SN 2002cx late-time spectra 
       with 4 spectra from 2003.

       li2003 Specifically on SN 2002cx 
       with 9 spectra reported.

       matheson2002 Specifically on SN 2002cx:
       it reports 2002may17.22 UT for the date of the first li2003 spectrum. 

       paturel2003 (Leda) Leda refererence.
        
       SUSPECT Index.

       SUSPECT Index:  SN 2002cx Ia.
       There are 0 spectra all from benetti2004.  
       But there is a great picture of
       Fritz Zwicky (Wikipedia).
       Just say Fritz Zwicky aloud and you can tell he's an up-to-date person.


CORRECTIONS:  Heliocentric velocity 7183 +/- 32 km/s (2007jun30) from
              PGC045981 (Leda).
              Galactic foreground 0.14/4=.035 reddening from
              PGC045981 (Leda).
              But this is derived from
              Schlegel et al. (1998).



OBSERVATIONS:  From
               1) li2003 and downloaded from CfA Supernova Archive and
                  I think the cfa spectra are all observer frame.  Graphical evidence agrees. 
                  So does a comparison with the 02cx spectra in David Branch's directory
                  that have the same flux, but deredshifted by about 7183 A.
               2) Eddie Baron has no SN 2002cx spectra in his files.
               3) David Branch has the early ones in /home/branch/synow/sn2002cx and I think
                  these are probably all deredshifted by comparison to the CfA supernova archive. 

SPECTRUM LOG:

     JD times for the SN 2002cx spectra of li2003
     Bmax from li2003 where the JD Bmax is JD 2452415.2 +/- 1.0 (p. 457)
     which is 2002may20.70 UT.

     Unfortunately, li2003 only provides whole number dates, and so
     some of the JDs' below are just placeholders until the real ones are
     available.

     The first 4 spectra have JD from the FITS headers of the
     cfa supernova archive spectra.

     The next 5 were taken at the Keck telescopes in Hawaii which is 10 hours = .4 days
     behind UT.  Thus, .4 UT is midnight in Hawaii.  Thus, the others were .4 +/- .3 UT.
     That's the best estimate I can make right now.

     As  far as I can tell all the cfa supernova archive spectra
     are in the observer frame.

     The spectra from David Branch's directory /home/branch/synow/sn2002cx
     seem to be all in the rest frame.

     JD Bmax   Heliocentric velocity (Leda, 2007jun30)
     52415.20  7183.
 
 
     Heliocentric velocity     Z redshift
           7183.0000000000   0.0239599090
 
     Index     JD of some kind Observer phase     Rest phase
 
         1    52411.7200000000  -3.4800000000  -3.3985705588     ! li2003  2002may17.22   3720.00--7521.00
         2    52414.6800000000  -0.5200000000  -0.5078323823     ! li2003  2002may20.18   3720.00--7540.50
         3    52427.7000000000  12.5000000000  12.2075091912     ! li2003  2002jun02.20   3720.00--7540.50
         4    52431.6800000000  16.4800000000  16.0943801176     ! li2003  2002jun06.18   3720.00--7500.00
         5    52435.9000000000  20.7000000000  20.2156352206     ! li2003  2002jun10.4    4187.08--10054.46 
         6    52440.9000000000  25.7000000000  25.0986388971     ! li2003  2002jun15.4
         7    52441.9000000000  26.7000000000  26.0752396324     ! li2003  2002jun16.4
         8    52442.9000000000  27.7000000000  27.0518403676     ! li2003  2002jun17.4
         9    52471.9000000000  56.7000000000  55.3732616912     ! li2003  2002jul16.4

&specnamelist
   aname='sn2002cx Ia 2002_05_'
   ebv=.035       ! 
   epoch=         ! This parameter needs to updated for the particular spectrum.
   idifmake=0
   iformat=1
   ismooth=0      ! Smoothing?
   itick=2
   itickln=4
   t_rise=19.4d0   ! conley2006, just an average rise time. 
   v_helio=7183.
   ymin2=0.1d0
   ymax2=1.d0
   ymin3=.3
   ymax3=3.
   wlammin1=
   wlammax1=
   wlammin2=
   wlammax2=
   wlammin3=
   wlammax3=
/




      

Postscript plot of the spectrum.




      

Postscript plot of the spectrum with local normalization.




FITS: Fits format information from the observers if any.