Diversity in extinction laws of Type Ia supernovae measured between 0.2 and 2 μm

Amanullah, R.; Johansson, Joel; Goobar, A.; Ferretti, R.; Papadogiannakis, S.; Petrushevska, T.; Brown, P. J.; Cao, Y.; Contreras, C.; Dahle, H.; Elias‐Rosa, N.; Fynbo, J. P. U.; Gorosabel, J.; Guaita, L.; Hangard, L.; Howell, D. A.; Hsiao, E. Y.; Kankare, E.; Kasliwal, M. M.; Leloudas, G.; Lundqvist, Peter; Mattila, S.; Nugent, P.; Phillips, M. M.; Sandberg, Andreas; Stanishev, V.; Sullivan, M.; Taddia, F.; Östlin, Göran; Asadi, Saghar; Herrero-Illana, R.; Jensen, Jaclyn; Karhunen, K.; Lazarević, Slavica; Varenius, Eskil; Santos, P. Marques Dos; Sridhar, S. S.; Wallström, Sofia; Wiegert, J.

doi:10.1093/mnras/stv1505

Cited by 94 publications

(69 citation statements)

References 164 publications

(260 reference statements)

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“…The best fit is shown together with the data in Figure 8 where the fitted parameter values were =  t 57777.8 0. iPTF17lf is another SNIa with high reddening and low R V (see e.g., Burns et al 2011;Amanullah et al 2015). Although lower R V values for highly reddened SNe is consistent with expectations for SNe discovered by magnitude limited surveys Figure 9.…”

Section: Iptf17lf: a Highly Reddened Sn Iasupporting

confidence: 80%

iPTF Survey for Cool Transients

Adams

Blagorodnova

Kasliwal

et al. 2018

PASP

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We performed a wide-area (2000 deg 2 ) g and I band experiment as part of a two month extension to the Intermediate Palomar Transient Factory. We discovered 36 extragalactic transients including iPTF17lf, a highly reddened local SN Ia, iPTF17bkj, a new member of the rare class of transitional Ibn/IIn supernovae, and iPTF17be, a candidate luminous blue variable outburst. We do not detect any luminous red novae and place an upper limit on their rate. We show that adding a slow-cadence I band component to upcoming surveys such as the Zwicky Transient Facility will improve the photometric selection of cool and dusty transients.

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Section: Iptf17lf: a Highly Reddened Sn Iasupporting

confidence: 80%

iPTF Survey for Cool Transients

Adams

Blagorodnova

Kasliwal

et al. 2018

PASP

Self Cite

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“…Although a larger He shell may burn all the way to 56 Ni, Shen & Moore (2014) predict that the He detonation will occur at lower masses and trigger a SNIa well before the He-shell becomes capable of producing 56 Ni. Amanullah et al (2015) show that SN2012cg may have time variable reddening that would change the colors with time. However, this effect is reported in only the M V 2 -colors and only nearer to t B max ( )than the phases we discuss here.…”

Section: Discussionmentioning

confidence: 95%

“…In Section 4.1 we show that the color excess for SN2012cg with respect to other SNe Ia is about 0.4-0.5 mag, which is significantly larger than the uncertainty of E(B−V) given above. We can increase the uncertainties to 0.08  mag include the BayeSN result and the Amanullah et al (2015) result of E B V 0.15 0.02 total ( ) -=  mag without affecting our primary results.…”

Section: Reddeningmentioning

confidence: 99%

SN 2012cg: EVIDENCE FOR INTERACTION BETWEEN A NORMAL SN Ia AND A NON-DEGENERATE BINARY COMPANION

Marion

Brown

Vinkó

et al. 2016

ApJ

156

202

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We report evidence for excess blue light from the Type Ia supernova (Sn Ia) SN2012cg at 15 and 16 days before maximum B-band brightness. The emission is consistent with predictions for the impact of the supernova on a nondegenerate binary companion. This is the first evidence for emission from a companion to a normal SNIa. Sixteen days before maximum light, the B V -color of SN2012cg is 0.2 mag bluer than for other normal SNIa. At later times, this supernova has a typical SNIa light curve, with extinction-corrected M 19.62 0.02 B = - mag and m B 0.86 0.02 15 ( ) D =  . Our data set is extensive, with photometry in seven filters from five independent sources. Early spectra also show the effects of blue light, and high-velocity features are observed at early times. Near maximum, the spectra are normal with a silicon velocity v Si =−10,500 km s −1 . Comparing the early data with models by Kasen favors a main-sequence companion of about six solar masses. It is possible that many other SN Ia have main-sequence companions that have eluded detection because the emission from the impact is fleeting and faint.

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“…We present the maximumlight HST spectrum of SN 2012cg, originally published by Amanullah et al (2015), but rereduced as described above (with the modest difference that the UV spectrum was obtained with the STIS CCD/G230LB setup and there was no CCD/G750L observation). To this, we also add the high-S/N near-maximum-light Swift UV spectrum of SN 2009ig (Foley et al 2012b).…”

Section: Data and Observationsmentioning

confidence: 99%

Ultraviolet diversity of Type Ia Supernovae

Foley

Pan

Brown

et al. 2016

Mon. Not. R. Astron. Soc.

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Ultraviolet (UV) observations of Type Ia supernovae (SNe Ia) probe the outermost layers of the explosion, and UV spectra of SNe Ia are expected to be extremely sensitive to differences in progenitor composition and the details of the explosion. Here we present the first study of a sample of high signal-to-noise ratio SN Ia spectra that extend blueward of 2900Å. We focus on spectra taken within 5 days of maximum brightness. Our sample of ten SNe Ia spans the majority of the parameter space of SN Ia optical diversity. We find that SNe Ia have significantly more diversity in the UV than in the optical, with the spectral variance continuing to increase with decreasing wavelengths until at least 1800Å (the limit of our data). The majority of the UV variance correlates with optical light-curve shape, while there are no obvious and unique correlations between spectral shape and either ejecta velocity or host-galaxy morphology. Using light-curve shape as the primary variable, we create a UV spectral model for SNe Ia at peak brightness. With the model, we can examine how individual SNe vary relative to expectations based on only their light-curve shape. Doing this, we confirm an excess of flux for SN 2011fe at short wavelengths, consistent with its progenitor having a subsolar metallicity. While most other SNe Ia do not show large deviations from the model, ASASSN-14lp has a deficit of flux at short wavelengths, suggesting that its progenitor was relatively metal rich.

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Diversity in extinction laws of Type Ia supernovae measured between 0.2 and 2 μm

Cited by 94 publications

References 164 publications

iPTF Survey for Cool Transients

iPTF Survey for Cool Transients

SN 2012cg: EVIDENCE FOR INTERACTION BETWEEN A NORMAL SN Ia AND A NON-DEGENERATE BINARY COMPANION

Ultraviolet diversity of Type Ia Supernovae

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