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<h1> SN 2002cx Ia in PGC045981 (CGCG 044-035) </h1>
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<a href="../../../../../writer/chaucer/chaucer_astrolabe.png">
<img src="../../../../../writer/chaucer/chaucer_astrolabe_50.png" align=right width=30%
alt="Geoffrey Chaucer with an astrolabe."> </a>
<pre>
OBJECT: SN 2002bo Ia in PGC045981 (CGCG 044-035) (S? galaxy) which in <a href="http://leda.univ-lyon1.fr/">Leda</a> is
<a href="http://leda.univ-lyon1.fr/ledacat.cgi?CGCG%20044-035&ob=ra">PGC045981 (Leda)</a>.
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 <a href="http://aa.usno.navy.mil/data/docs/JulianDate.html">
Julian Date Converter</a>.
This <a href="../../listdata/days.html">day of the year 140</a>.
SUPERNOVA of the YEAR: M = <a href="../../listdata/desig.html#desig_of_year">102</a>.
HEADER: <a href="./header">Header</a> Common header information for this supernovae.
The common header may (or may not) be updated relative to the header information above
(<a href="http://www.nhn.ou.edu/~jeffery/">D. J. Jeffery (2007jan01)</a>).
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:
<a href="http://www.cfa.harvard.edu/iau/lists/Supernovae.html">CfA List of Supernovae</a>
where SN 2002cx is noted.
<a href="http://www.cfa.harvard.edu/oir/Research/supernova/SNarchive.html">CfA Supernova Archive</a>
For SN 2002cx, this has 4 spectra (li2003) and 0 photometry.
The spectra are the 4 earliest ones in li2003.
<a href="../../../../../aalib/aastex/ref.html#conley2006">conley2006</a> General value
of 19.4 days for Ia rise time in B.
<a href="../../../../../aalib/aastex/ref.html#jha2006a">jha2006a</a> Specifically on SN 2002cx late-time spectra
with 4 spectra from 2003.
<a href="../../../../../aalib/aastex/ref.html#li2003">li2003</a> Specifically on SN 2002cx
with 9 spectra reported.
<a href="../../../../../aalib/aastex/ref.html#matheson2002">matheson2002</a> Specifically on SN 2002cx:
it reports 2002may17.22 UT for the date of the first li2003 spectrum.
<a href="../../../../../aalib/aastex/ref.html#paturel2003">paturel2003 (Leda)</a> Leda refererence.
<a href="http://bruford.nhn.ou.edu/~suspect/cgi-bin/snindex.cgi">SUSPECT Index</a>.
<a href="http://bruford.nhn.ou.edu/~suspect/cgi-bin/search.cgi?spec=yes&OBJECT=2002cx">SUSPECT Index: SN 2002cx Ia</a>.
There are 0 spectra all from benetti2004.
But there is a great picture of
<a href="http://en.wikipedia.org/wiki/Fritz_Zwicky">Fritz Zwicky (Wikipedia)</a>.
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
<a href="http://leda.univ-lyon1.fr/ledacat.cgi?CGCG%20044-035&ob=ra">PGC045981 (Leda)</a>.
Galactic foreground 0.14/4=.035 reddening from
<a href="http://leda.univ-lyon1.fr/ledacat.cgi?CGCG%20044-035&ob=ra">PGC045981 (Leda)</a>.
But this is derived from
<a href="../../../../../aalib/aastex/ref.html#schlegel1998">Schlegel et al. (1998)</a>.
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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=
/
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<a href="./figure/sn2002cx_2002_05_.gif">
<img src="./figure/sn2002cx_2002_05_.gif" align=middle width=80%
alt="./figure/sn2002cx_2002_05_.gif"> </a>
<a href="./figure/sn2002cx_2002_05_.ps">Postscript plot of the spectrum.</a>
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<a href="./figure/sn2002cx_2002_05_.dif.gif">
<img src="./figure/sn2002cx_2002_05_.dif.gif" align=middle width=80%
alt="./figure/sn2002cx_2002_05_.dif.gif"> </a>
<a href="./figure/sn2002cx_2002_05_.dif.ps">Postscript plot of the spectrum</a> with local normalization.
<hr>
FITS: Fits format information from the observers if any.