J/ApJ/877/152 UV to NIR light curves of type Ia SN 2017erp (Brown+, 2019)
Red and reddened: ultraviolet through near-infrared observations of Type Ia
supernova 2017erp.
Brown P.J., Hosseinzadeh G., Jha S.W., Sand D., Vieira E., Wang X., Dai M.,
Dettman K.G., Mould J., Uddin S., Wang L., Arcavi I., Bento J., Burns C.R.,
Diamond T., Hiramatsu D., Howell D.A., Hsiao E.Y., Marion G.H., Mccully C.,
Milne P.A., Mirzaqulov D., Ruiter A.J., Valenti S., Xiang D.
<Astrophys. J., 877, 152-152 (2019)>
=2019ApJ...877..152B 2019ApJ...877..152B (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae; Photometry, ultraviolet; Photometry, UBVRI
Keywords: dust, extinction; supernovae: general
supernovae: individual: (SN2017erp, SN2011fe, SN2011by)
Abstract:
We present space-based ultraviolet/optical photometry and spectroscopy
with the Swift Ultra-Violet/Optical Telescope and Hubble Space
Telescope (HST), respectively, along with ground-based optical
photometry and spectroscopy and near-infrared spectroscopy of
supernova SN 2017erp. The optical light curves and spectra are
consistent with a normal SN Ia. Compared to previous photometric
samples in the near-ultraviolet (NUV), SN 2017erp has UV colors that
are redder than NUV-blue SNe Ia corrected to similar optical colors.
The chromatic difference between SNe 2011fe and 2017erp is dominated
by the intrinsic differences in the UV rather than the expected dust
reddening. This chromatic difference is similar to the SALT2 color
law, derived from rest-frame ultraviolet photometry of higher redshift
SNe Ia. Differentiating between intrinsic UV diversity and dust
reddening can have important consequences for determining cosmological
distances with rest-frame ultraviolet photometry. This ultraviolet
spectroscopic series is the first from HST of a normal, albeit
reddened, NUV-red SN Ia and is important for analyzing SNe Ia with
intrinsically redder NUV colors. We show model comparisons suggesting
that metallicity could be the physical difference between NUV-blue and
NUV-red SNe Ia, with emission peaks from reverse fluorescence near
3000Å implying a factor of ∼10 higher metallicity in the upper
layers of SN 2017erp compared to SN 2011fe. Metallicity estimates are
very model dependent, however, and there are multiple effects in the
UV. Further models and UV spectra of SNe Ia are needed to explore the
diversity of SNe Ia, which show seemingly independent differences in
the near-UV peaks and mid-UV flux levels.
Description:
SN 2017erp was discovered by Itagaki (2017TNSTR.647....1I 2017TNSTR.647....1I) in images
taken on 2017 June 13 15:01:28 (UT). The host galaxy of SN 2017erp is
NGC 5861.
The Neil Gehrels Swift Observatory began observing SN 2017erp on 2017
June 14 04:55:33 with the six photometric filters: uvw2, uvm2, uvw1,
u, b, and v of the UVOT.
Observations with the HST were triggered as part of the program
"Ultraviolet Spectra of a Normal Standard Candle" to obtain UV
spectroscopy. Four epochs were obtained with the HST's STIS using the
G430L grism and the CCD detector and the G230L grism and the MAMA
detector.
Optical light curves and spectra come from the Global Supernova
Project, a three-year Key Project to observe light curves and
spectroscopy of hundreds of SNe using the Las Cumbres Observatory
global network of 21 robotic telescopes. UBVgri images were taken with
the Sinistro cameras on the Las Cumbres Observatory network of 1m
telescopes.
Broadband BVRI-band photometric observations of SN 2017erp were also
obtained with the Tsinghua-NAOC 0.8m telescope (TNT) at Xinglong
Observatory in China and AZT-22 1.5m telescope at Madanak Astronomical
Observatory in Uzbekistan, spanning the phases from +2 to +28 days
relative to the B-band maximum light.
Objects:
----------------------------------------------------------
RA (ICRS) DE Designation(s)
----------------------------------------------------------
15 09 14.81 -11 20 03.2 SN 2017erp = DLT 17cc
----------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 30 623 Photometric magnitudes of SN 2017erp
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
J/ApJ/607/665 : Type Ia supernovae at z>1 discovered by HST (Riess+, 2004)
J/A+A/430/373 : HI lines in 586 galaxies (Theureau+, 2005)
J/ApJ/659/122 : Improved distances to type Ia supernovae (Jha+, 2007)
J/MNRAS/376/1301 : UBVRI light-curves of SN 2005cf (Pastorello+, 2007)
J/A+A/471/527 : Spectroscopy of SN 2005cf (Garavini+, 2007)
J/ApJ/699/L139 : Spectral parameters of SNe Ia (Wang+, 2009)
J/ApJS/185/32 : First-year SDSS-II SN results (Kessler+, 2009)
J/ApJ/721/1608 : Absolute UV magnitudes of type Ia SNe (Brown+, 2010)
J/A+A/523/A7 : Light curves of type Ia supernovae in SNLS (Guy+, 2010)
J/MNRAS/425/1819 : Berkeley supernova Ia program. II. (Silverman+, 2012)
J/A+A/554/A27 : 2011fe spectrophotometric time series (Pereira+, 2013)
J/ApJ/787/29 : UVOT photom. of Super-Chandrasekhar mass SNe Ia (Brown+, 2014)
J/ApJ/788/L21 : Measured photometry of SN 2014J from HST (Amanullah+, 2014)
J/A+A/568/A22 : Joint analysis of the SDSS-II and SNLS SNe Ia (Betoule+, 2014)
J/ApJ/796/L18 : Type Ia supernova 2011de UVOT photometry (Brown, 2014)
J/A+A/578/A9 : Optical and NIR spectra of SN iPTF13ebh (Hsiao+, 2015)
J/MNRAS/452/4307 : From opt. to IR photometry of SN 2013dy (Pan+, 2015)
J/ApJ/826/56 : HST/WFC3 obs. of Cepheids in SN Ia host gal. (Riess+, 2016)
J/MNRAS/459/3939 : Type II supernova light curves (Valenti+, 2016)
J/ApJ/836/232 : Swift-UVOT obs. analysis of 29 SNe Ia (Brown+, 2017)
J/MNRAS/499/1424 : Properties of 407 SNe and their 394 hosts (Hakobyan+, 2020)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.2 d MJD [57918.2/58022.4] Modified Julian Date
10 A1 --- l_mag Limit flag on mag
11- 15 F5.2 mag mag [13.4/20.1] Apparent magnitude in Filt
17- 20 F4.2 mag e_mag [0/0.32]? Uncertainty in mag
22- 25 A4 --- Filt Filter used
27- 30 A4 --- Obs Observatory code (1)
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Note (1): Observatory code as follows:
AZT = AZT-22 1.5m telescope at Madanak Astronomical Observatory
(68 occurrences);
LCO = Las Cumbres Observatory network of 1-meter telescopes
(436 occurrences);
TNT = Tsinghua-NAOC 0.8-m telescope at Xinglong Observatory (8 occurrences);
UVOT = Swift/UVOT instrument (111 occurrences).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 24-Nov-2020