J/MNRAS/410/585 SN 2009dc BVRI light curves (Silverman+, 2011)
Fourteen months of observations of the possible super-Chandrasekhar mass type Ia
supernova 2009dc.
Silverman J.M., Ganeshalingam M., Li W., Filippenko A.V., Miller A.A.,
Poznanski D.
<Mon. Not. R. Astron. Soc., 410, 585-611 (2011)>
=2011MNRAS.410..585S 2011MNRAS.410..585S
ADC_Keywords: Supernovae ; Photometry
Keywords: supernovae: general - supernovae: individual: SN 2009dc -
supernovae: individual: SN 2007if -
supernovae: individual: SN 2003fg - supernovae: individual: SN 2006gz
Abstract:
In this paper, we present and analyse optical photometry and spectra
of the extremely luminous and slowly evolving Type Ia supernova (SN
Ia) 2009dc, and offer evidence that it is a super-Chandrasekhar mass
(SC) SN Ia and thus has a SC white dwarf (WD) progenitor. Optical
spectra of SN 2007if, a similar object, are also shown. SN 2009dc had
one of the most slowly evolving light curves ever observed for a SN
Ia, with a rise time of ∼23d and {DELTA}m15(B)=0.72mag. We calculate
a lower limit to the peak bolometric luminosity of ∼2.4x1043erg/s,
though the actual value is likely almost 40 per cent larger. Optical
spectra of SN 2009dc and SN 2007if obtained near maximum brightness
exhibit strong CII features (indicative of a significant amount of
unburned material), and the post-maximum spectra are dominated by
iron-group elements (IGEs). All of our spectra of SN 2009dc and SN
2007if also show low expansion velocities. However, we see no strong
evidence in SN 2009dc for a velocity `plateau' near maximum light like
the one seen in SN 2007if. The high luminosity and low expansion
velocities of SN 2009dc lead us to derive a possible WD progenitor
mass of more than 2M☉ and a 56Ni mass of about 1.4-1.7M☉.
Description:
Observations of SN 2009dc began on 2009 Apr. 17, about one week before
maximum B-band brightness, in BVRI filters using the 0.76-m Katzman
Automatic Imaging Telescope (KAIT) and the 1-m Nickel telescope, both
at Lick Observatory. We continued to follow SN 2009dc for over 5
months until 2009 Sept. 26, when it reached the western limit of both
telescopes in the early evening. We obtained late-time gVRI images of
SN 2009dc using the dual-arm Low-Resolution Imaging Spectrometer
(LRIS) with the 10-m Keck I telescope on 2010 Feb. 6 (281d past
maximum), BRI images using the DEIMOS spectrograph (Faber et al. 2003)
mounted on the 10-m Keck II telescope on 2010 Jun. 12 (403d past
maximum) and V-band images again using LRIS on 2010 Jun. 13.
Our optical photometry is complemented with data taken from the
UltraViolet Optical Telescope (UVOT) on the Swift Observatory in the
U, B, V, UVW1, UVM2 and UVW2 filters. We downloaded seven epochs of
observations from the Swift archives.
Objects:
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RA (2000) DE Designation(s)
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15 51 12.1 +25 42 28 SN 2009dc = SN 2009dc
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 65 66 Early-time BVRI photometry of SN 2009dc
table4.dat 28 34 UVOT (aboard Swift) photometry of SN 2009dc
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See also:
B/sn : Asiago Supernova Catalogue (Barbon et al., 1999-)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 F10.2 d JD Julian date
12- 17 F6.3 mag Bmag ?=- Johnson B magnitude
19- 22 F4.3 mag e_Bmag ?=- rms uncertainty on Bmag
24- 29 F6.3 mag Vmag ?=- Johnson V magnitude
31- 34 F4.3 mag e_Vmag ?=- rms uncertainty on Vmag
36- 41 F6.3 mag Rcmag ?=- Cousins R magnitude
43- 46 F4.3 mag e_Rcmag ?=- rms uncertainty on Rcmag
48- 53 F6.3 mag Icmag ?=- Cousins I magnitude
55- 58 F4.3 mag e_Icmag ?=- rms uncertainty on Icmag
60- 65 A6 --- Tel Telescope used
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 10 F10.2 d JD Julian date
12- 15 A4 --- Filt [UVM2 UVW1 UVW2 UBV] Filter (1)
17- 22 F6.3 mag mag Magnitude in Filter
24- 28 F5.3 mag e_mag rms uncertainty on mag
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Note (1): UBV in Johnson-Cousins system; the UV filters central wavelength
(c) and FWHM (w) are, in nm (see Poole et al. 2008MNRAS.383..627P 2008MNRAS.383..627P):
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(F) (c) (w)
-----------------
UVW1 260.0 69.3
UVM2 224.6 49.8
UVW2 192.8 65.7
-----------------
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 14-Aug-2011