From: Ariel Goobar (ariel@physto.se)
Date: Fri Feb 28 2003 - 00:46:39 PST
1996E 0.43 0.120 0.226
Hi Rob,
the "too blue problem" in their data set is discussed in
Leibundgut 2001, The Annual Review of Astronomy and Astrophysics 2001, 39,
67. I am attaching the relevant figure from his paper for you to compare.
I was hoping that you uberspectrum would aliviate the problem, but
it doesn't look that way. From your table I get a reduced chi2 = 2.5
for the hypothesis of E(B-V)=0, with a trend of larger discrepancy for
the high-z points where the observed R band includes a larger fraction of
restframe U. I added the redshifts and sorted your table below.
Ariel
SN z E(B-V) dE(B-V)
-------------------------------
1996J 0.30 0.213 0.071
1996K 0.38 -0.055 0.095
1996E 0.43 0.120 0.226
1996U 0.43 -0.164 0.121
1997ce 0.44 -0.064 0.071
1995K 0.478 -0.116 0.106
1997cj 0.50 0.039 0.071
1996I 0.57 -0.174 0.113
1996H 0.62 -0.208 0.085
On Thu, 27 Feb 2003, Robert A. Knop Jr. wrote:
> Wow. I've just pulled the mb and mv data from the Riess 1998 paper on
> their high-z supernovae, and evaluated E(B-V) for the nine high-z
> supernovae that they have dm15 lightcurve fits for. This is what I get
> for their E(B-V) values:
>
> SN E(B-V) dE(B-V)
> -----------------------
> 1996E 0.120 0.226
> 1996H -0.208 0.085
> 1996I -0.174 0.113
> 1996J 0.213 0.071
> 1996K -0.055 0.095
> 1996U -0.164 0.121
> 1997ce -0.064 0.071
> 1997cj 0.039 0.071
> 1995K -0.116 0.106
>
> It looks like those guys really were suffering from a mild "too blue
> supernova" problem. Of course, when you prior it all away, you don't
> have to talk about it....
>
> (I evaulated these E(B-V) values by comparing their mb and mv values to
> the values I get from my current favorite uberspectrum, and the
> difference in the B template betwen day 0 and day 0.87 (the latter being
> where my templates come to maximum in V).)
>
> -Rob
>
>
-- ___________________________________________________________________ Ariel Goobar (www.physto.se/~ariel) Department of Physics, Stockholm University AlbaNova University Center, SE-106 91 Stockholm, SWEDEN tel: +46 8 55378659 fax: +46 8 55378601
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