J/ApJ/938/L22 UV & opt. phot. & spectra of Type Ia SN2011aa (Dutta+, 2022)
Can the violent merger of white dwarfs explain the slowest declining Type Ia
supernova SN 2011aa?
Dutta A., Anupama G.C., Chakradhari N.K., Sahu D.K.
<Astrophys. J., 938, L22 (2022)>
=2022ApJ...938L..22D 2022ApJ...938L..22D
ADC_Keywords: Supernovae; Photometry, ultraviolet; Spectra, optical
Keywords: Supernovae
Abstract:
We present optical observations and Monte Carlo radiative transfer
modeling of the Type Ia supernova (SN Ia) SN 2011aa. With a
Δm15(B) of 0.59±0.07mag and a peak magnitude MB of
-19.30±0.27mag, SN 2011aa has the slowest decline rate among SNe Ia.
The secondary maximum in the I band is absent or as equally bright as
the primary maximum. The velocity of CII is lower than the velocity of
SiII. This indicates either the presence of C at lower velocities than
Si or a line-of-sight effect. Application of Arnett's radiation
diffusion model to the bolometric light curve indicates a massive
ejecta Mej 1.8-2.6M☉. The slow decline rate and large ejecta
mass, with a normal peak magnitude, are well explained by a double
degenerate, violent merger explosion model. The synthetic spectra and
light curves generated with SEDONA considering a violent merger
density profile match the observations.
Description:
SN 2011aa was observed in imaging and spectroscopic mode with the 2m
Himalayan Chandra Telescope (HCT) of the Indian Astronomical
Observatory (IAO), Hanle, India. Photometric monitoring of SN 2011aa
began on 2011-Feb-08 (JD2455601.33) and continued until 2011-Jun-27
(JD2455740.13). Spectroscopic observation of SN 2011aa was carried out
during 2011-Feb-08 (JD2455601.36) to 2011-Apr-29 (JD2455681.18). The
images were obtained in Bessell UBVRI filters and the spectra were
obtained using grisms Gr7 (3500-7800Å) and Gr8 (5200-9100Å) with
the Himalayan Faint Object Spectrograph Camera (HFOSC), mounted on the
HCT.
The UltraViolet Optical Telescope (UVOT) on board the Swift satellite
observed SN 2011aa in three broadband optical filters u, b, and v and
three UV filters uvw2, uvm2, and uvw1, during ~-8days to ~+45days with
respect to the B-band maximum. The Swift-UVOT data were downloaded
from the Swift archive.
Objects:
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RA (ICRS) DE Designation(s)
--------------------------------------------------------------
07 36 42.62 +74 26 34.7 SN 2011aa = PSN J07364263+7426348
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
fig1.dat 37 265 Swift-UVOT and HCT-UBVRI magnitudes of SN 2011aa
list.dat 50 23 List of the spectra (Data behind Figure 2)
sp/* . 23 *Individual spectra in FITS format
(Data behind Figure 2)
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Note on sp/*: The FITS spectra are 1D Image (HDU=0) files, with a linear
spectral resolution of ∼1.25Å/pixel and the flux values encoded in
units of erg/cm2/s/Å.
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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-)
J/AJ/137/4517 : UVOT light curves of supernovae (Brown+, 2009)
J/ApJ/699/L139 : Spectral parameters of SNe Ia (Wang+, 2009)
J/ApJ/748/L29 : SN Ia supernovae observed by Swift/XRT (Russell+, 2012)
J/MNRAS/445/2440 : SN with associated Planck CMB temperatures (Yershov+, 2014)
J/ApJ/787/29 : UVOT phot. of Super-Chandrasekhar mass SNe Ia (Brown+, 2014)
J/ApJ/795/142 : Defining photometric peculiar SNe Ia (Gonzalez-Gaitan+, 2014)
J/ApJS/220/9 : CfAIR2: NIR light curves of Type Ia SNe (Friedman+, 2015)
J/ApJ/923/197 : SNIa observed in H-band with UV-opt. LCs (Ponder+, 2021)
J/ApJ/925/217 : Optical phot. and sp. monitoring of SN 2020sck (Dutta+, 2022)
J/other/PASA/39.46 : Pantheon+ SN Ia redshift and PV Data (Carr+, 2022)
Byte-by-byte Description of file: fig1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.3 d JD Julian date of observation
13- 19 F7.3 d Phase [-10.2/127] Phase (1)
21- 24 A4 --- Filt Filter
26- 31 F6.3 mag omag [14.1/19.4] Observed magnitude in Filt
33- 37 F5.3 mag e_omag [0.004/0.3] Uncertainty in omag
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Note (1): Rest frame time since B-band maximum (JD=2455611.65)
(JD-JDmax)/(1+z); z=0.013
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Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 31 A31 --- FileName Name of the FITS file in subdirectory "sp"
34- 43 F10.2 d JD Julian date of the observation
45- 50 F6.2 d Phase [-10.16/68.64] Phase; in the rest frame since
the B-band maximum (JD=2455611.65)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 02-Sep-2024