J/ApJ/796/L18 Type Ia supernova 2011de UVOT photometry (Brown, 2014)
The ultraviolet brightest type Ia supernova 2011de.
Brown P.J.
<Astrophys. J., 796, L18 (2014)>
=2014ApJ...796L..18B 2014ApJ...796L..18B (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry, ultraviolet ; Photometry, UBV
Keywords: supernovae: general -
supernovae: individual: SN2011de, SN2011aa, LSQ12gdj, SN2009dc -
ultraviolet: general
Abstract:
We present and discuss the ultraviolet (UV)/optical photometric light
curves and absolute magnitudes of the Type Ia supernova (SN Ia) 2011de
from the Swift Ultraviolet/Optical Telescope. We find it to be the UV
brightest SN Ia yet observed - more than a factor of 10 brighter than
normal SNe Ia in the mid-ultraviolet. We find that the UV/optical
brightness and broad light curve evolution can be modeled with
additional flux from the shock of the ejecta hitting a relatively
large red giant companion separated by 6x1013 cm. However, the
post-maximum behavior of other UV-bright SNe Ia can also be modeled in
a similar manner, including objects with UV spectroscopy or
pre-maximum photometry which is inconsistent with this model. This
suggests that similar UV luminosities can be intrinsic or caused by
other forms of shock interaction. The high velocities reported for
SN 2011de make it distinct from the UV-bright "super-Chandrasekhar"
SNe Ia and the NUV-blue group of normal SNe Ia. SN 2011de is an
extreme example of the UV variations in SNe Ia.
Description:
SN 2011de was observed with the Swift spacecraft beginning 2011 May 28.2.
Photometry was obtained in six UV and optical bands (see Roming et al.
2005SSRv..120...95R 2005SSRv..120...95R and Poole et al. 2008MNRAS.383..627P 2008MNRAS.383..627P for filter
details). Swift UVOT data were analyzed using the reduction method of
the Swift Optical/Ultraviolet Supernova Archive (Brown et al. 2014,
Ap&SS, 354, 89). This includes subtraction of the underlying galaxy
flux and uses the revised UV zeropoints and time-dependent sensitivity
from Breeveld et al. (2011AIPC.1358..373B 2011AIPC.1358..373B). For simplicity we will
focus on three filters with which to study colors and absolute
magnitudes. We use uvm2 for the mid-UV, u for the near-UV (or NUV),
and the v band for the optical. This is similar to Brown et al.
(2014ApJ...787...29B 2014ApJ...787...29B) with u being substituted for uvw1 because the
long optical tails of the uvw1 filter complicate the comparison of
objects with different spectral shapes.
Objects:
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RA (ICRS) DE Designation(s)
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15 43 53.25 +67 45 42.5 SN 2011de = PSN J15435325+6745425
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 64 77 UVOT Photometry
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See also:
II/339 : Swift/UVOT Serendipitous Source Catalog (Yershov, 2015)
J/AJ/137/4517 : UVOT light curves of supernovae (Brown+, 2009)
J/ApJ/721/1608 : Absolute UV magnitudes of type Ia SNe (Brown+, 2010)
J/ApJ/749/18 : Swift/UVOT observations of 12 nearby SN-Ia (Brown+, 2012)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- SN [SN2011de] Supernova identifier
10- 13 A4 --- Filter Filter used in the observation
15- 24 F10.4 d MJD Modified Julian Date of the observation
26- 31 F6.3 mag mag Observed magnitude in Filter
33- 37 F5.3 mag e_mag Error in mag
39- 44 F6.3 mag magl3 The 3σ magnitude limit
46- 51 F6.3 mag maglmax The bright magnitude limit
53- 58 F6.3 ct/s CR Count rate
60- 64 F5.3 ct/s e_CR Error in CR
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History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 30-May-2017