J/AJ/151/125 Optical and UV photometry of SN 2013dy (Zhai+, 2016)
UV-optical observation of Type Ia supernova SN 2013dy in NGC 7250.
Zhai Q., Zhang J.-J., Wang X.-F., Zhang T.-M., Liu Z.-W., Brown P.J.,
Huang F., Zhao X.-L., Chang L., Yi W.-M., Wang C.-J., Xin Y.-X.,
Wang J.-G., Lun B.-L., Zhang X.-L., Fan Y.-F., Zheng X.-M., Bai J.-M.
<Astron. J., 151, 125-125 (2016)>
=2016AJ....151..125Z 2016AJ....151..125Z (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry, UBVRI; Photometry, ultraviolet ;
Photometry, uvby
Keywords: galaxies: individual (NGC 7250) - supernovae: general -
supernovae: individual (SN 2013dy)
Abstract:
Extensive and independent observations of Type Ia supernova (SNIa)
SN2013dy are presented, including a larger set of UBVRI photometry and
optical spectra from a few days before the peak brightness to ∼200days
after explosion, and ultraviolet (UV) photometry spanning from
t~-10days to t~+15days refers to the B band maximum. The peak
brightness (i.e., MB=-19.65±0.40mag;
Lmax=[1.95±0.55]*1043/ergs) and the mass of synthesized 56Ni
(i.e., M(56Ni)=0.90±0.26M☉) are calculated, and they conform
to the expectation for an SNIa with a slow decline rate (i.e.,
Δm15(B)=0.90±0.03mag). However, the near infrared (NIR)
brightness of this SN (i.e., MH=-17.33±0.30mag) is at least 1.0mag
fainter than usual. Besides, spectroscopy classification reveals that
SN2013dy resides on the border of "core normal" and "shallow silicon"
subclasses in the Branch et al. classification scheme, or on the
border of the "normal velocity" SNeIa and 91T/99aa-like events in the
Wang et al. system. These suggest that SN2013dy is a slow-declining
SNIa located on the transitional region of nominal spectroscopic
subclasses and might not be a typical normal sample of SNeIa.
Description:
SN2013dy, an Type Ia supernova (SNIa), was discovered at roughly a
magnitude of ∼17.2mag on UT July 10.45 2013 (Universal Time) in an
unfiltered image of the galaxy NGC7250 by the Lick observatory
supernova search (Casper et al., 2013CBET.3588....1C 2013CBET.3588....1C).
Our first observation of SN 2013dy is in spectroscopy on 2013 July 14
(Zhang & Wang 2013CBET.3394....1Z 2013CBET.3394....1Z; 4.76days after the first light and
published in Zheng et al. 2013ApJ...778L..15Z 2013ApJ...778L..15Z) with the Yunnan Faint
Object Spectrograph and Camera (YFOSC) mounted at the Li-Jiang 2.4m
Telescope (LJT) of Yunnan Observatories (YNAO), China.
About two weeks later, we started to monitor this transient
intensively at LJT in both ground-based UBVRI photometry and
spectroscopy spanning from t~+0 to t~+180days. Ten local standard
stars (see Table1 in the paper) in the field of SN2013dy are used to
transform the instrumental magnitudes of SN2013dy to the standard
Johnson UBV and Kron-Cousins RI system, as listed in Table2.
Optical photometry data are also collected with the Tsinghua-NAOC 0.8m
telescope (TNT) at Xing-Long Observation of National Astronomical
Observatories (NAOC), China, from t~-2days to t~+150days.
Additionally, three spectra were obtained at the Xing-Long 2.16 m
telescope (hereafter XLT) with the Bei-Jing Faint Object Spectrograph
and Camera (BFOSC).
Furthermore, this target was also observed by the Ultra-Violet/Optical
Telescope (UVOT) on board the Swift satellite. The Swift observatory
began observing SN 2013dy on 2013 July 17.09, about 10days (t~-10days)
before the B band maximum, and continued for approximately 26days
(t~+15days). These photometric observations are performed in three UV
filters (uvw2, uvm2, and uvw1) and three broadband optical filters
(uu, bb, and vv). Table3 lists the final UVOT UV/optical magnitudes of
SN2013dy.
Objects:
----------------------------------------------------------
RA (ICRS) DE Designation(s)
----------------------------------------------------------
22 18 17.60 +40 34 09.6 SN 2013dy = SN 2013dy
----------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 64 96 The UBVRI photometry of SN 2013dy from the
ground-based observations
table3.dat 81 23 Swift-UVOT photometry of SN 2013dy
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See also:
B/sn : Asiago Supernova Catalogue (Barbon et al., 1999-)
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)
J/ApJS/220/20 : Si and Ca high-velocity features in SNe Ia (Zhao+, 2015)
J/AJ/148/1 : Optical and UV photometry of SN 2012fr (Zhang+, 2014)
J/ApJ/753/22 : Swift/UVOT observations of SN 2011fe (Brown+, 2012)
J/MNRAS/410/585 : SN 2009dc BVRI light curves (Silverman+, 2011)
J/ApJ/721/1608 : Absolute UV magnitudes of type Ia SNe (Brown+, 2010)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.2 d MJD Modified Julian Date (JD-2400000.5)
10- 15 F6.2 d Time [-2.8/182.7] Number of days relative to the
date of the B band maximum (JD=2456501.38)
17- 21 F5.2 mag Umag [12.8/19.5]? The Johnson U-band magnitude
23- 24 I2 cmag e_Umag [2/13]? The 1σ uncertainty in Umag
26- 30 F5.2 mag Bmag [13.2/18.3]? The Johnson B-band magnitude
32- 33 I2 cmag e_Bmag [1/4]? The 1σ uncertainty in Bmag
35- 39 F5.2 mag Vmag [12.9/17.8] The Johnson V-band magnitude
41- 42 I2 cmag e_Vmag [1/5] The 1σ uncertainty in Vmag
44- 48 F5.2 mag Rmag [12.8/18.3] The Kron-Cousins R-band magnitude
50- 51 I2 cmag e_Rmag [1/3] The 1σ uncertainty in Rmag
53- 57 F5.2 mag Imag [12.9/18.4]? The Kron-Cousins I-band magnitude
59- 60 I2 cmag e_Imag [1/6]? The 1σ uncertainty in Imag
62- 64 A3 --- Tel Telescope (LJT or TNT) (1)
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Note (1): The two instruments are defined as below:
LJT = The Li-Jiang 2.4m Telescope (LJT) of Yunnan Observatories (YNAO),
China;
TNT = The Tsinghua-NAOC 0.8m Telescope (TNT) at Xing-Long Observation of
National Astronomical Observatories (NAOC), China.
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.2 d MJD Modified Julian Date (JD-2400000.5)
10- 15 F6.2 d Time [-10.8/15.3] Number of days relative to the date
of the B band maximum (JD=2456501.38)
17- 21 F5.2 mag uvw2 [16.1/17.6]? Swift/UVOT ultraviolet uvw2 band
magnitude
23- 24 I2 cmag e_uvw2 [8/35]? The 1σ uncertainty in uvw2
26- 30 F5.2 mag uvw2rc [18/22.6]? Swift/UVOT ultraviolet uvw2 band
magnitude (1)
32- 36 F5.2 mag uvm2 [17.7/18.9]? Swift/UVOT ultraviolet uvm2 band
magnitude
38- 39 I2 cmag e_uvm2 [10/24]? The 1σ uncertainty in uvm2
41- 45 F5.2 mag uvw1 [14.4/16.3]? Swift/UVOT ultraviolet uvw1 band
magnitude
47- 48 I2 cmag e_uvw1 [5/9]? The 1σ uncertainty in uvw1
50- 54 F5.2 mag uvw1rc [14.5/18.2]? Swift/UVOT ultraviolet uvw1 band
magnitude (1)
56- 60 F5.2 mag uu [12.7/14.6] Swift/UVOT optical uu band magnitude
62- 63 I2 mag e_uu [3/6] The 1σ uncertainty in uu
65- 69 F5.2 mag bb [13.2/14.3]? Swift/UVOT optical bb band magnitude
71- 72 I2 mag e_bb [3/4]? The 1σ uncertainty in bb
74- 78 F5.2 mag vv [12.9/14.1]? Swift/UVOT optical vv band magnitude
80- 81 I2 mag e_vv [3/5]? The 1σ uncertainty in vv
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Note (1): After "Red-tail" correction (Brown et al. 2010, cat. J/ApJ/721/1608).
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History:
From electronic version of the journal
(End) Sylvain Guehenneux [CDS] 10-Aug-2016