J/A+A/611/A58 SN 2007on and SN 2011iv light curves (Gall+, 2018)
Two transitional type Ia supernovae located in the Fornax cluster member
NGC 1404: SN 2007on and SN 2011iv.
Gall C., Stritzinger M.D., Ashall C., Baron E., Burns C.R., Hoeflich P.,
Hsiao E.Y., Mazzali P.A., Phillips M.M., Filippenko A.V., Anderson J.P.,
Benetti S., Brown P.J., Campillay A., Challis P., Contreras C.,
Elias de la Rosa N., Folatelli G., Foley R.J., Fraser M., Holmbo S.,
Marion G.H., Morrell N., Pan Y.-C., Pignata G., Suntzeff N.B., Taddia F.,
Torres Robledo S., Valenti S.
<Astron. Astrophys. 611, A58 (2018)>
=2018A&A...611A..58G 2018A&A...611A..58G (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry, standards ; Photometry, ultraviolet ;
Photometry, SDSS ; Photometry, UBV ; Photometry, infrared
Keywords: supernovae: general - supernovae: individual: SN2007on -
supernovae: individual: SN 2011iv - dust, extinction
Abstract:
We present an analysis of ultraviolet (UV) to near-infrared
observations of the fast-declining Type Ia supernovae (SNe Ia) 2007on
and 2011iv, hosted by the Fornax cluster member NGC 1404. The B-band
light curves of SN 2007on and SN 2011iv are characterised by Δm15(B)
decline-rate values of 1.96mag and 1.77mag, respectively. Although
they have similar decline rates, their peak B- and H-band magnitudes
differ by ∼0.60mag and ∼0.35mag, respectively. After correcting for
the luminosity vs. decline rate and the luminosity vs. colour
relations, the peak B-band and H-band light curves provide distances
that differ by ∼14% and ∼9%, respectively. These findings serve as a
cautionary tale for the use of transitional SNe Ia located in
early-type hosts in the quest to measure cosmological parameters.
Interestingly, even though SN 2011iv is brighter and bluer at early
times, by three weeks past maximum and extending over several months,
its B-V colour is 0.12mag redder than that of SN 2007on. To
reconcile this unusual behaviour, we turn to guidance from a suite of
spherical one-dimensional Chandrasekhar-mass delayed-detonation
explosion models. In this context, 56Ni production depends on both
the so-called transition density and the central density of the
progenitor white dwarf. To first order, the transition density drives
the luminosity-width relation, while the central density is an
important second-order parameter. Within this context, the differences
in the B-V colour evolution along the Lira regime suggest that the
progenitor of SN 2011iv had a higher central density than SN 2007on.
Description:
Detailed optical and NIR light curves of SN 2007on obtained by the
first phase of the Carnegie Supernova Project (CSP-I, 2004-2009;
Hamuy et al., 2006PASP..118....2H 2006PASP..118....2H) were published by Stritzinger et
al. (2011, Cat. J/AJ/142/156).UV uvw2-, uvm2-, and uvw1-band imaging
of both SN 2007on and SN 2011iv were obtained with Swift (+ UVOT).
Photome- try of SN 2007on and SN 2011iv was computed following the
method described in detail by Brown et al. (2014Ap&SS.354...89B 2014Ap&SS.354...89B), who
use the calibration published by Breeveld et al. (2011, AIPCS, 1358,
373). The Swift UVOT images and photometry are also available as part
of the Swift Optical Ultraviolet Supernova Archive (SOUSA; Brown et
al. 2014Ap&SS.354...89B 2014Ap&SS.354...89B). Optical ugriBV-band imaging of SN 2007on and
SN 2011iv was obtained with the Henrietta Swope 1.0m telescope
(+ SITe3 direct CCD camera) located at the Las Campanas Observatory
(LCO). The NIR YJH-band imaging of SN 2007on was obtained with the
Swope (+ RetroCam) and the Irenee du Pont 2.5m (+ WIRC: Wide Field
Infrared Camera) telescopes (Stritzinger et al., Cat. J/AJ/142/156),
while in the case of SN 2011iv all NIR YJH-band imaging was taken with
RetroCam attached to the Irenee du Pont telescope. The optical local
sequence is calibrated relative to Landolt (1992AJ....104..372L 1992AJ....104..372L) (BV)
and Smith et al. (2002AJ....123.2121S 2002AJ....123.2121S) (ugri) standard-star fields
observed over multiple photometric nights. The NIR J-band and H-band
local sequences were calibrated relative to the Persson et al.
(1998AJ....116.2475P 1998AJ....116.2475P) standard stars, while the Y- band local sequence
was calibrated relative to standard Y-band magnitudes computed using a
combination of stellar atmosphere models (Castelli & Kurucz, 2003,
IAUSymp, 210, A20) with the J-Ks colours of the Persson et al.
standard-star catalogue (Hamuy et al., 2006PASP..118....2H 2006PASP..118....2H).
Objects:
-------------------------------------------------
RA (2000) DE Designation(s)
-------------------------------------------------
03 38 50.90 -35 34 30.0 SN 2007on = SN 2007on
03 38 51.35 -35 35 32.0 SN 2011iv = SN 2011iv
-------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 56 48 UVOT UV photometry of SN 2007on and SN 2011iv
table2.dat 103 30 Optical photometry of the local sequence stars
in the field of NGC 1404 in the 'standard' system
table3.dat 70 30 Near-IR photometry of the local sequence stars in
the field of NGC 1404 in the 'natural' system
table4.dat 83 99 Optical photometry of SN 2007on and SN 2011iv in
the 'natural' system
table5.dat 54 82 NIR photometry of SN 2007on and SN 2011iv in the
'natural' system
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- SN SN name (SN 2007on or SN 2011iv)
11- 17 F7.1 d MJD Modified Julian date
19- 23 F5.1 d Phase Phase, days relative to T(B)max
25- 30 F6.3 mag UVW2 ?=0 UVW2-band magnitude
32- 34 I3 mmag e_UVW2 ?=0 rms uncertainty on UVW2
36- 41 F6.3 mag UVM2 ?=0 UVM2-band magnitude
43- 45 I3 mmag e_UVM2 ?=0 rms uncertainty on UVM2
47- 52 F6.3 mag UVW1 ?=0 UVW1-band magnitude
54- 56 I3 mmag e_UVW1 ?=0 rms uncertainty on UVW1
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- SN SN name (SN 2007on or SN 2011iv)
11- 12 I2 --- Star Star number
15- 16 I2 h RAh Right Ascension J2000 (hours)
18- 19 I2 min RAm Right Ascension J2000 (minutes)
21- 25 F5.2 s RAs Right Ascension J2000 (seconds)
27 A1 --- DE- Declination J2000 (sign)
28- 29 I2 deg DEd Declination J2000 (degrees)
31- 32 I2 arcmin DEm Declination J2000 (minutes)
34- 37 F4.1 arcsec DEs Declination J2000 (seconds)
39- 44 F6.3 mag umag ?=0 u-band magnitude
46- 48 I3 mmag e_umag ?=0 rms uncertainty on umag
50- 55 F6.3 mag gmag ?=0 g-band magnitude
57- 59 I3 mmag e_gmag ?=0 rms uncertainty on gmag
61- 66 F6.3 mag rmag r-band magnitude
68- 70 I3 mmag e_rmag rms uncertainty on rmag
72- 77 F6.3 mag imag i-band magnitude
79- 81 I3 mmag e_imag rms uncertainty on imag
83- 88 F6.3 mag Bmag ?=0 B-band magnitude
90- 92 I3 mmag e_Bmag ?=0 rms uncertainty on Bmag
94- 99 F6.3 mag Vmag ?=0 V-band magnitude
101-103 I3 mmag e_Vmag ?=0 rms uncertainty on Vmag
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- SN SN name (SN 2007on or SN 2011iv)
11- 13 I3 --- Star Star number
15- 16 I2 h RAh Right Ascension J2000 (hours)
18- 19 I2 min RAm Right Ascension J2000 (minutes)
21- 25 F5.2 s RAs Right Ascension J2000 (seconds)
27 A1 --- DE- Declination J2000 (sign)
28- 29 I2 deg DEd Declination J2000 (degrees)
31- 32 I2 arcmin DEm Declination J2000 (minutes)
34- 37 F4.1 arcsec DEs Declination J2000 (seconds)
39- 44 F6.3 mag Ymag ?=0 Y-band magnitude
46- 48 I3 mmag e_Ymag ?=0 rms uncertainty on Ymag
50- 55 F6.3 mag Jmag ?=0 J-band magnitude
57- 59 I3 mmag e_Jmag ?=0 rms uncertainty on Jmag
61- 66 F6.3 mag Hmag ?=0 H-band magnitude
68- 70 I3 mmag e_Hmag ?=0 rms uncertainty on Hmag
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- SN SN name (SN 2007on or SN 2011iv)
11- 17 F7.2 d JD Julian date (JD-2450000)
19- 24 F6.3 mag umag ?=0 u-band magnitude
26- 28 I3 mmag e_umag ?=0 rms uncertainty on umag
30- 35 F6.3 mag gmag ?=0 g-band magnitude
37- 39 I3 mmag e_gmag ?=0 rms uncertainty on gmag
41- 46 F6.3 mag rmag ?=0 r-band magnitude
48- 50 I3 mmag e_rmag ?=0 rms uncertainty on rmag
52- 57 F6.3 mag imag ?=0 i-band magnitude
59- 61 I3 mmag e_imag ?=0 rms uncertainty on imag
63- 68 F6.3 mag Bmag ?=0 B-band magnitude
70- 72 I3 mmag e_Bmag ?=0 rms uncertainty on Bmag
74- 79 F6.3 mag Vmag ?=0 V-band magnitude
81- 83 I3 mmag e_Vmag ?=0 rms uncertainty on Vmag
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- SN SN name (SN 2007on or SN 2011iv)
11- 17 F7.2 d JD Julian date (JD-2450000)
19- 24 F6.3 mag Ymag ?=0 Y-band magnitude
26- 28 I3 mmag e_Ymag ?=0 rms uncertainty on Ymag
30- 35 F6.3 mag Jmag ?=0 J-band magnitude
37- 39 I3 mmag e_Jmag ?=0 rms uncertainty on Jmag
41- 46 F6.3 mag Hmag ?=0 H-band magnitude
48- 50 I3 mmag e_Hmag ?=0 rms uncertainty on Hmag
52- 54 A3 --- Tel Abbreviation of the telescope used (1)
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Note (1): Telescope abbreviation as follows:
SWO = Swope telescope
DUP = du Pont telescope
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Acknowledgements:
Christa Gall, christa(at)dark-cosmology.dk
(End) Christa Gall [Aarhus Univ., Denmark], Patricia Vannier [CDS] 29-Nov-2017