J/ApJ/928/103 Phot. and sp. obs. of type Ia SN 2015bo (Hoogendam+, 2022)
A tale of two type Ia supernovae: the fast-declining siblings SNe 2015bo and
1997cn.
Hoogendam W.B., Ashall C., Galbany L., Shappee B.J., Burns C.R., Lu J.,
Phillips M.M., Baron E., Holmbo S., Hsiao E.Y., Morrell N.,
Stritzinger M.D., Suntzeff N.B., Taddia F., Young D.R., Lyman J.D.,
Benetti S., Mazzali P.A., Delgado Mancheno M., Diaz R.G., Torres S.M.
<Astrophys. J., 928, 103 (2022)>
=2022ApJ...928..103H 2022ApJ...928..103H
ADC_Keywords: Supernovae; Photometry, UBVRI; Spectra, optical; Spectra, infrared
Keywords: Supernovae
Abstract:
We present optical and near-infrared photometric and spectroscopic
observations of the fast-declining Type Ia supernova (SN) 2015bo.
SN2015bo is underluminous (MB=-17.50±0.15 mag) and has a
fast-evolving light curve (Δm15(B)=1.91±0.01mag and
sBV=0.48±0.01). It has a unique morphology in the observed V-r
color curve, where it is bluer than all other supernovae (SNe) in the
comparison sample. A 56Ni mass of 0.17±0.03M☉ was derived
from the peak bolometric luminosity, which is consistent with its
location on the luminosity-width relation. Spectroscopically, SN2015bo
is a cool SN in the Branch classification scheme. The velocity
evolution measured from spectral features is consistent with
1991bg-like SNe. SN 2015bo has a SN twin (similar spectra) and sibling
(same host galaxy), SN 1997cn. Distance moduli of
µ=34.33±0.01(stat)±0.11(sys)mag and
µ=34.34±0.04(stat)±0.12(sys)mag are derived for SN 2015bo and
SN 1997cn, respectively. These distances are consistent at the
0.06σ level with each other, and they are also consistent with
distances derived using surface-brightness fluctuations and
redshift-corrected cosmology. This suggests that fast-declining SNe
could be accurate distance indicators, which should not be excluded
from future cosmological analyses.
Description:
Data for this work comes from two projects: the Carnegie Supernova
Project II (CSP-II; Phillips+ 2019PASP..131a4001P 2019PASP..131a4001P) and PESSTO
(Smartt+ 2015, J/A+A/579/A40).
Photometric observations were acquired in the uBVgriJHY filters from
-6.9 days to +105.8d relative to rest-frame B-band maximum light.
Optical photometry was obtained from the Swope telescope, and the NIR
photometry came from the du Pont Telescope. Both telescopes are
located at the Las Campanas Observatory.
Sixteen optical and one NIR spectra of SN 2015bo were obtained from
-7.8 days to +31.8 days relative to rest-frame B-band maximum light.
Spectra were taken with a variety of instruments including SPRAT
mounted on the Liverpool Telescope, ALFOSC on the Nordic Optical
Telescope, EFOSC on the NTT, and WFCCD on the du Pont Telescope.
The NIR spectrum was obtained with the Folded-port InfraRed Echellette
(FIRE) on the Baade telescope at the Magellan Observatory. See Table 3.
Objects:
--------------------------------------------------------------
RA (ICRS) DE Designation(s)
--------------------------------------------------------------
14 09 55.13 +17 31 55.9 SN 2015bo = PSN J14095513+1731556
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tableb1.dat 73 60 Log of optical photometric data
table3.dat 43 16 Log of spectroscopic observations
fig11.dat 39 19600 Time series of optical spectra for SN 2015bo
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See also:
II/282 : The SDSS Photometric Catalog, Release 6 (Adelman-McCarthy+, 2007)
J/A+AS/126/15 : Kinematical data on early-type galaxies. II. (Simien+ 1997)
J/AJ/131/527 : UBVRI light curves of 44 type Ia supernovae (Jha+, 2006)
J/MNRAS/377/1531 : Optical & IR photometry of SN 2004eo (Pastorello+, 2007)
J/ApJ/686/749 : Improved cosmological constraints from SNe (Kowalski+, 2008)
J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)
J/ApJ/722/566 : Host galaxies of SNIa in SDSS-II SN survey (Lampeitl+, 2010)
J/MNRAS/406/782 : Type Ia supernovae luminosities (Sullivan+, 2010)
J/MNRAS/412/1441 : SNe luminosity functions (Li+, 2011)
J/AJ/143/126 : Spectroscopy of nearby Type Ia supernovae (Blondin+, 2012)
J/MNRAS/425/1789 : Berkeley supernova Ia program. I. (Silverman+, 2012)
J/ApJ/773/53 : Type Ia SNe spectroscopy by the CSP (Folatelli+, 2013)
J/A+A/568/A22 : Joint analysis of the SDSS-II & SNLS SNe Ia (Betoule+, 2014)
J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)
J/MNRAS/448/2766 : Strong lines in the opt/NIR for SN 2002bo (Blondin+, 2015)
J/ApJ/815/58 : Spectrophot. time series obs. of twin SNIa (Fakhouri+, 2015)
J/A+A/578/A9 : Optical and NIR spectra of SN iPTF13ebh (Hsiao+, 2015)
J/A+A/579/A40 : PESSTO catalog (Smartt+, 2015)
J/ApJS/218/10 : HET Massive Galaxy Survey (HETMGS) (van den Bosch+, 2015)
J/ApJ/826/56 : HST/WFC3 obs. of Cepheids in SN Ia host gal. (Riess+, 2016)
J/AJ/154/211 : CSP (DR3): photometry of low-z SNe Ia (Krisciunas+, 2017)
J/ApJ/869/56 : Updated calibration of the CSP-I SNIa sample (Burns+, 2018)
J/A+A/611/A58 : SN 2007on and SN 2011iv light curves (Gall+, 2018)
J/ApJ/859/101 : The supernovae Ia Pantheon sample (Scolnic+, 2018)
J/A+A/630/A76 : SN2016hnk photometry and spectroscopy (Galbany+, 2019)
J/ApJ/895/118 : Opt. & NIR photometry of 2 Ia type supernovae (Burns+, 2020)
J/ApJ/900/140 : CSP-II: sp. of the 03fg-like SNIa LSQ14fmg (Hsiao+, 2020)
J/AJ/159/167 : AMUSING++ nearby galaxy compilation. I. (Lopez-Coba+, 2020)
J/ApJ/914/57 : Follow-up Opt. & NIR obs. of SN2015bp (Wyatt+, 2021)
Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 7 F7.1 d MJD [57069.4/57182.1] Modified Julian Day of
the observation
9- 13 F5.2 mag umag [18/19.8]? Apparent u band AB magnitude
15- 18 F4.2 mag e_umag [0.02/0.2]? Uncertainty in umag
20- 24 F5.2 mag Bmag [16.8/20.7]? Apparent B band Vega magnitude
26- 29 F4.2 mag e_Bmag [0.01/0.1]? Uncertainty in Bmag
31- 35 F5.2 mag Vmag [16.4/20.4]? Apparent V band Vega magnitude
37- 40 F4.2 mag e_Vmag [0.01/0.1]? Uncertainty in Vmag
42- 46 F5.2 mag gmag [16.6/20.7]? Apparent g band AB magnitude
48- 51 F4.2 mag e_gmag [0.01/0.1]? Uncertainty in gmag
53- 57 F5.2 mag rmag [16.2/21]? Apparent r band AB magnitude
59- 62 F4.2 mag e_rmag [0.01/0.07]? Uncertainty in rmag
64- 68 F5.2 mag imag [16.6/20.2]? Apparent i band AB magnitude
70- 73 F4.2 mag e_imag [0.01/0.07]? Uncertainty in imag
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 "Y/M/D" Date Date of observation (UT)
12- 19 F8.2 d MJD [57068.3/57108.7] Modified Julian Date
21- 24 F4.1 d Phase [-7.8/31.8] Epoch phase relative to rest-frame
B-band maximum (JD2457078.3±0.1d)
26- 33 A8 --- Tel Telescope (1)
35- 40 A6 --- Inst Spectrograph
42- 43 A2 --- Flag sp: indicates spectrum data in fig11.dat;
column added by CDS
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Note (1): Telescope as follows:
LT = Liverpool Telescope
NTT = New Technology Telescope
NOT = Nordic Optical Telescope
DUP = du Pont Telescope
Magellan = Baade telescope at the Magellan Observatory
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Byte-by-byte Description of file: fig11.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.2 d MJD [57068.3/57108.7] Modified Julian Date
10- 18 F9.3 0.1nm lambda [3340.3/24790.8] Wavelength; Angstroms
20- 29 E10.3 cW/m2/nm Flux [-0.5/1.5] Flux; erg/s/cm2/Å
31- 39 E9.3 cW/m2/nm e_Flux [2e-18/4.7e-17]?=0 Uncertainty in Flux
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmnanuelle Perret [CDS] 21-Feb-2024