J/AJ/148/1 Optical and ultraviolet photometry of SN 2012fr (Zhang+, 2014)
Optical and ultraviolet observations of the narrow-lined Type Ia SN 2012fr in
NGC 1365.
Zhang J.-J., Wang X.-F., Bai J.-M., Zhang T.-M., Wang B., Liu Z.-W.,
Zhao X.-L., Chen J.-C.
<Astron. J., 148, 1 (2014)>
=2014AJ....148....1Z 2014AJ....148....1Z
ADC_Keywords: Supernovae ; Photometry, UBVRI; Photometry, ultraviolet;
Spectrophotometry
Keywords: supernovae: individual: SN 2012fr
Abstract:
Extensive optical and UltraViolet (UV) observations of the type Ia
supernova (SN Ia) 2012fr are presented in this paper. It has a
relatively high luminosity, with an absolute B-band peak magnitude of
about -19.5mag and a smaller post-maximum decline rate than normal SNe
Ia (e.g., Δm15(B)=0.85±0.05mag). Based on the UV and optical
light curves, we derived that a 56Ni mass of about 0.88M☉ was
synthesized in the explosion. The earlier spectra are characterized by
noticeable high-velocity features of Si II λ6355 and Ca II with
velocities in the range of ∼22000-25000km/s. At around the maximum
light, these spectral features are dominated by the photospheric
components which are noticeably narrower than normal SNe Ia. The
post-maximum velocity of the photosphere remains almost constant at
∼12000km/s for about one month, reminiscent of the behavior of some
luminous SNe Ia like SN 1991T. We propose that SN 2012fr may represent
a subset of the SN 1991T-like SNe Ia viewed in a direction with a
clumpy or shell-like structure of ejecta, in terms of a significant
level of polarization reported in Maund et al. (2013MNRAS.433L..20M 2013MNRAS.433L..20M).
Description:
SN 2012fr was discovered by Klotz et al. (2012CBET.3276....1K 2012CBET.3276....1K) on 2012
October 27.05 using the 0.25m robotic telescope TAROT La Silla
observatory, Chile.
Our observations of SN 2012fr started from 2012 November 04 with the
Yunnan Faint Object Spectrograph and Camera (YFOSC) mounted on the
Li-Jiang 2.4m Telescope (LJT) of Yunnan Astronomical Observatories
(YNAO), China. Our optical photometry for SN 2012fr was obtained in
the BVRI bands with the LJT and YFOSC system, covering the period from
t≃+11days to t≃+71days since the B-band maximum light JD 2456243.50
(2012 November 12).
SN 2012fr was also intensively observed with the Ultra-Violet/Optical
Telescope (UVOT) on board the Swift satellite, spanning from
t≃-14days to t≃+126days relative to the B-band maximum light.
Objects:
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RA (ICRS) DE Designation(s)
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03 33 35.99 -36 07 37.7 SN 2012fr = PSN J03333599-3607377
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 54 11 BVRI photometry of SN 2012fr from the
Li-Jiang 2.4m Telescope (LJT) and Yunnan Faint
Object Spectrograph and Camera (YFOSC)
table3.dat 77 61 Swift UVOT photometry of SN 2012fr
table5.dat 55 19 Magnitudes of the spectrophotometry of SN 2012fr
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See also:
J/ApJ/753/22 : Swift/UVOT observations of SN 2011fe (Brown+, 2012)
J/ApJS/190/418 : Light curves for 165 SNe (Ganeshalingam+, 2010)
J/AJ/137/4517 : UVOT light curves of supernovae (Brown+, 2009)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 F8.2 d MJD Modified Julian Date (JD-2400000)
10- 14 F5.2 d Days [10.68/71] Days after the epoch of B-band
maximum JD 2456243.50 (2012 November 12)
16- 20 F5.2 mag Bmag ? Johnson B band magnitude
22- 24 F3.2 mag e_Bmag ? The 1σ error in Bmag
26- 30 F5.2 mag Vmag Johnson V band magnitude
32- 34 F3.2 mag e_Vmag The 1σ error in Vmag
36- 40 F5.2 mag Rmag Kron-Cousins R band magnitude
42- 44 F3.2 mag e_Rmag The 1σ error in Rmag
46- 50 F5.2 mag Imag ? Kron-Cousins I band magnitude
52- 54 F3.2 mag e_Imag ? The 1σ error in Imag
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 8 F8.2 d MJD Modified Julian Date (JD-2400000)
10- 16 F7.2 d Days [-14.22/126] Days after the epoch of B-band
maximum JD 2456243.50 (2012 November 12)
18- 22 F5.2 mag UVW2 ? Swift/UVOT ultraviolet UVW2 band magnitude
24- 26 F3.2 mag e_UVW2 ? 1σ error in UVW2
29- 33 F5.2 mag UVM2 ? Swift/UVOT ultraviolet UVM2 band magnitude
35- 37 F3.2 mag e_UVM2 ? 1σ error in UVM2
39- 43 F5.2 mag UVW1 ? Swift/UVOT ultraviolet uvw1 band magnitude
45- 47 F3.2 mag e_UVW1 ? 1σ error in UVW1
49- 53 F5.2 mag Umag ? Swift/UVOT optical U band magnitude
55- 57 F3.2 mag e_Umag ? 1σ error in Umag
59- 63 F5.2 mag Bmag ? Swift/UVOT optical B band magnitude
65- 67 F3.2 mag e_Bmag ? 1σ error in Bmag
69- 73 F5.2 mag Vmag ? Swift/UVOT optical V band magnitude
75- 77 F3.2 mag e_Vmag ? 1σ error in Vmag
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 8 F8.2 d MJD Modified Julian Date (JD-2400000)
10- 15 F6.2 d Days [-7.25/70.54] Days after the epoch of B-band
maximum JD 2456243.50 (2012 November 12)
17- 21 F5.2 mag Bmag B band magnitude from spectrophotometry (1)
23- 25 F3.2 mag e_Bmag The 1σ error in Bmag (2)
27- 31 F5.2 mag Vmag V band magnitude from spectrophotometry (1)
33- 35 F3.2 mag e_Vmag The 1σ error in Vmag (2)
37- 41 F5.2 mag Rmag R band magnitude from spectrophotometry (1)
43- 45 F3.2 mag e_Rmag The 1σ error in Rmag (2)
47- 51 F5.2 mag Imag I band magnitude from spectrophotometry (1)
53- 55 F3.2 mag e_Imag The 1σ error in Imag (2)
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Note (1): The spectra have been corrected for reddening and redshift before
being used for spectrophotometry.
Note (2): The errors include uncertainties in slit loss, sky transparency loss,
and flux calibration of the spectra
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History:
From electronic version of the journal
(End) Sylvain Guehenneux [CDS] 20-Nov-2014