scholarly journals Highly reddened Type Ia supernova SN 2004ab: another case of anomalous extinction

2017 ◽  
Vol 474 (2) ◽  
pp. 2502-2513 ◽  
Author(s):  
N K Chakradhari ◽  
D K Sahu ◽  
G C Anupama ◽  
T P Prabhu
Keyword(s):  
Velocity Gradient ◽  
Spectroscopic Data ◽  
Absolute Magnitude ◽  
Host Galaxy ◽  
Broad Line ◽  
Rate Parameter ◽  
Bolometric Luminosity ◽  
Type Ia Supernova ◽  
Type Ia ◽  
Anomalous Extinction

Abstract We present optical photometric and spectroscopic data for supernova SN 2004ab, a highly reddened normal Type Ia supernova. The total reddening is estimated as E(B − V) = 1.70 ± 0.05 mag. The intrinsic decline-rate parameter Δm15(B)true is 1.27 ± 0.05, and the B-band absolute magnitude at maximum $M_{B}^{{\rm max}}$ is −19.31 ± 0.25 mag. The host galaxy NGC 5054 is found to exhibit anomalous extinction with a very low value of RV = 1.41 ± 0.06 in the direction of SN 2004ab. The peak bolometric luminosity is derived as $\log L_{\rm bol}^{\rm max}$ = 43.10 ± 0.07 erg s−1. The photospheric velocity measured from the absorption minimum of the Si ii λ6355 line shows a velocity gradient of $\dot{v}$ = 90 km s−1 d−1, indicating that SN 2004ab is a member of the high velocity gradient (HVG) subgroup. The ratio of the strengths of the Si ii λ5972 and λ6355 absorption lines, $\cal R$(Si ii), is estimated as 0.37, while their pseudo-equivalent widths suggest that SN 2004ab belongs to the broad line (BL) type subgroup.

scholarly journals SN 2015bq: A Luminous Type Ia Supernova with Early Flux Excess

2022 ◽  
Vol 924 (1) ◽  
pp. 35
Author(s):  
Liping Li ◽  
Jujia Zhang ◽  
Benzhong Dai ◽  
Wenxiong Li ◽  
Xiaofeng Wang ◽  
...  
Keyword(s):  
Radioactive Decay ◽  
Absolute Magnitude ◽  
Light Curves ◽  
Iron Group ◽  
Intermediate Mass ◽  
Bolometric Luminosity ◽  
Type Ia Supernova ◽  
Decline Rate ◽  
Type Ia ◽  
Absorption Features

Abstract We present optical and ultraviolet (UV) observations of a luminous type Ia supernova (SN Ia) SN 2015bq characterized by early flux excess. This SN reaches a B-band absolute magnitude at M B = −19.68 ± 0.41 mag and a peak bolometric luminosity at L = (1.75 ± 0.37) × 1043 erg s−1, with a relatively small post-maximum decline rate [Δm 15(B) = 0.82 ± 0.05 mag]. The flux excess observed in the light curves of SN 2015bq a few days after the explosion, especially seen in the UV bands, might be due to the radioactive decay of 56Ni mixed into the surface. The radiation from the decay of the surface 56Ni heats the outer layer of this SN. It produces blue U − B color followed by monotonically reddening in the early phase, dominated iron-group lines, and weak intermediate-mass element absorption features in the early spectra. The scenario of enhanced 56Ni in the surface is consistent with a large amount of 56Ni ( M 56 Ni = 0.97 ± 0.20 M ☉) synthesized during the explosion. The properties of SN 2015bq are found to locate between SN 1991T and SN 1999aa, suggesting the latter two subclasses of SNe Ia may have a common origin.

scholarly journals Rapidly Declining Hostless Type Ia Supernova KSP-OT-201509b from the KMTNet Supernova Program: Transitional Nature and Constraint on 56Ni Distribution and Progenitor Type

2021 ◽  
Vol 910 (2) ◽  
pp. 151
Author(s):  
Dae-Sik Moon ◽  
Yuan Qi Ni ◽  
Maria R. Drout ◽  
Santiago González-Gaitán ◽  
Niloufar Afsariardchi ◽  
...  
Keyword(s):  
Light Curve ◽  
Radioactive Decay ◽  
Light Curves ◽  
Host Galaxy ◽  
Curve Evolution ◽  
Sensitivity Limit ◽  
Bolometric Luminosity ◽  
Type Ia Supernova ◽  
Type Ia ◽  
High Cadence

Abstract We report the early discovery and multicolor (BVI) high-cadence light-curve analyses of the rapidly declining sub-Chandrasekhar Type Ia supernova KSP-OT-201509b (= AT 2015cx) from the KMTNet Supernova Program. The Phillips and color stretch parameters of KSP-OT-201509b are ΔM B,15 ≃ 1.62 mag and s BV ≃ 0.54, respectively, at an inferred redshift of 0.072. These, together with other measured parameters (such as the strength of the secondary I-band peak, colors, and luminosity), identify the source to be a rapidly declining Type Ia of a transitional nature that is closer to Branch-normal than 91bg-like. Its early light-curve evolution and bolometric luminosity are consistent with those of homologously expanding ejecta powered by radioactive decay and a Type Ia SN explosion with 0.32 ± 0.01 M ⊙ of synthesized 56Ni mass, 0.84 ± 0.12 M ⊙ of ejecta mass, and (0.61 ± 0.14) × 1051 erg of ejecta kinetic energy. While its B − V and V − I colors evolve largely synchronously with the changes in the I-band light curve, as found in other supernovae, we also find the presence of an early redward evolution in V − I prior to −10 days since peak. The bolometric light curve of the source is compatible with a stratified 56Ni distribution extended to shallow layers of the exploding progenitor. Comparisons between the observed light curves and those predicted from ejecta–companion interactions clearly disfavor Roche lobe–filling companion stars at large separation distances, thus supporting a double-degenerate scenario for its origin. The lack of any apparent host galaxy in our deep stack images reaching a sensitivity limit of ∼28 mag arcsec−2 makes KSP-OT-201509b a hostless Type Ia supernova and offers new insights into supernova host galaxy environments.

scholarly journals TYPE Ia SUPERNOVA PROPERTIES AS A FUNCTION OF THE DISTANCE TO THE HOST GALAXY IN THE SDSS-II SN SURVEY

2012 ◽  
Vol 755 (2) ◽  
pp. 125 ◽  
Author(s):  
Lluís Galbany ◽  
Ramon Miquel ◽  
Linda Östman ◽  
Peter J. Brown ◽  
David Cinabro ◽  
...  
Keyword(s):  
Host Galaxy ◽  
Type Ia Supernova ◽  
Type Ia

scholarly journals Lens modelling of the strongly lensed Type Ia supernova iPTF16geu

2020 ◽  
Vol 496 (3) ◽  
pp. 3270-3280
Author(s):  
E Mörtsell ◽  
J Johansson ◽  
S Dhawan ◽  
A Goobar ◽  
R Amanullah ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Hubble Constant ◽  
Host Galaxy ◽  
Total Probability ◽  
Lens Model ◽  
Density Profiles ◽  
Type Ia Supernova ◽  
Standard Candle ◽  
Type Ia ◽  
Universal Expansion

ABSTRACT In 2016, the first strongly lensed Type Ia supernova (SN Ia), iPTF16geu, at redshift z = 0.409 with four resolved images arranged symmetrically around the lens galaxy at z = 0.2163, was discovered. Here, refined observations of iPTF16geu, including the time delay between images, are used to decrease uncertainties in the lens model, including the the slope of the projected surface density of the lens galaxy, Σ ∝ r1 − η, and to constrain the universal expansion rate H0. Imaging with Hubble Space Telescope provides an upper limit on the slope η, in slight tension with the steeper density profiles indicated by imaging with Keck after iPTF16geu had faded, potentially due to dust extinction not corrected for in host galaxy imaging. Since smaller η implies larger magnifications, we take advantage of the standard candle nature of SNe Ia constraining the image magnifications, to obtain an independent constraint of the slope. We find that a smooth lens density fails to explain the iPTF16geu fluxes, regardless of the slope, and additional substructure lensing is needed. The total probability for the smooth halo model combined with star microlensing to explain the iPTF16geu image fluxes is maximized at 12 per cent for η ∼ 1.8, in excellent agreement with Keck high-spatial-resolution data, and flatter than an isothermal halo. It also agrees perfectly with independent constraints on the slope from lens velocity dispersion measurements. Combining with the observed time delays between the images, we infer a lower bound on the Hubble constant, $H_0 \gtrsim 40\, {\rm km \ s^{-1} Mpc^{-1}}$, at 68.3 per cent confidence level.

scholarly journals THE DWARF STARBURST HOST GALAXY OF A TYPE Ia SUPERNOVA ATz= 1.55 FROM CANDELS

2012 ◽  
Vol 760 (2) ◽  
pp. 125 ◽  
Author(s):  
Teddy F. Frederiksen ◽  
Jens Hjorth ◽  
Justyn R. Maund ◽  
Steven A. Rodney ◽  
Adam G. Riess ◽  
...  
Keyword(s):  
Host Galaxy ◽  
Type Ia Supernova ◽  
Type Ia

Optical and UV studies of type Ia supernovae SN 2009ig and SN 2012cg

2019 ◽  
Vol 487 (2) ◽  
pp. 1886-1904 ◽  
Author(s):  
N K Chakradhari ◽  
D K Sahu ◽  
G C Anupama
Keyword(s):  
Maximum Velocity ◽  
Absolute Magnitude ◽  
Type Ia Supernovae ◽  
Strength Ratio ◽  
Rate Parameter ◽  
Spectral Evolution ◽  
Maximum Phase ◽  
Decline Rate ◽  
Type Ia ◽  
Ia Supernovae

Abstract We present an extensive optical–ultraviolet photometry and analysis of a series of optical spectra of type Ia supernovae SN 2009ig and SN 2012cg. The observations range from −15 to +185 d for SN 2009ig and from −14 to 316 d for SN 2012cg, with respect to maximum light in B band. Both SN 2009ig and SN 2012cg exhibit similar properties. They have similar decline rate parameter (Δm15(B)true = 0.92 ± 0.04 for SN 2009ig and 0.93 ± 0.06 for SN 2012cg) and B band peak absolute magnitude (−19.45 ± 0.40 mag for SN 2009ig and −19.50 ± 0.31 mag for SN 2012cg). Their early spectra show high-velocity features in Si ii and Ca ii lines. The strong Fe iii, Si iii, and weak Si ii λ5972 line during pre-maximum phase are indicative of hot photosphere. The post-maximum velocity evolution shows a plateau like phase with velocities ∼13 000 km s−1 for SN 2009ig and ∼10 000 km s−1 for SN 2012cg. Both events show spectral evolution similar to normal SNe Ia and fall in LVG and Core Normal subgroup. Both have smaller strength ratio [$\cal R$(Si ii) = 0.17 for SN 2009ig and 0.20 for SN 2012cg] consistent with smaller Δm15(B). Peak bolometric luminosities ($\log L_\text{bol}^\text{max}$) of these events are estimated as 43.17 ± 0.16 and 43.24 ± 0.11 erg s−1 suggesting that 0.60 ± 0.20 M⊙ of 56Ni was synthesized in the explosion of SN 2009ig and 0.72 ± 0.31 M⊙ in SN 2012cg.

scholarly journals THE SDSS-II SUPERNOVA SURVEY: PARAMETERIZING THE TYPE Ia SUPERNOVA RATE AS A FUNCTION OF HOST GALAXY PROPERTIES

2012 ◽  
Vol 755 (1) ◽  
pp. 61 ◽  
Author(s):  
Mathew Smith ◽  
Robert C. Nichol ◽  
Benjamin Dilday ◽  
John Marriner ◽  
Richard Kessler ◽  
...  
Keyword(s):  
Host Galaxy ◽  
Type Ia Supernova ◽  
Type Ia

scholarly journals SN 2017hpa: A carbon-rich type Ia supernova

2021 ◽  
Author(s):  
Anirban Dutta ◽  
Avinash Singh ◽  
G C Anupama ◽  
D K Sahu ◽  
Brajesh Kumar
Keyword(s):  
Spectral Synthesis ◽  
Model Fit ◽  
Absorption Feature ◽  
Distance Modulus ◽  
Normal Type ◽  
Radiation Diffusion ◽  
Bolometric Luminosity ◽  
Type Ia Supernova ◽  
Type Ia ◽  
Ia Supernovae

Abstract We present the optical (UBVRI) and ultraviolet (Swift-UVOT) photometry, and optical spectroscopy of Type Ia supernova SN 2017hpa. We study broadband UV+optical light curves and low resolution spectroscopy spanning from −13.8 to +108 d from the maximum light in B-band. The photometric analysis indicates that SN 2017hpa is a normal type Ia with ΔmB(15) = 0.98 ± 0.16 mag and MB = −19.45 ± 0.15 mag at a distance modulus of μ = 34.08 ± 0.09 mag. The (uvw1 − uvv) colour evolution shows that SN 2017hpa falls in the NUV-blue group. The (B − V) colour at maximum is bluer in comparison to normal type Ia supernovae. Spectroscopic analysis shows that the Si ii 6355 absorption feature evolves rapidly with a velocity gradient, $\dot{v}=128\pm 7$ km s−1 d−1. The pre-maximum phase spectra show prominent C ii 6580 Å absorption feature. The C ii 6580 Å line velocity measured from the observed spectra is lower than the velocity of Si ii 6355 Å, which could be due to a line of sight effect. The synthetic spectral fits to the pre-maximum spectra using syn++ indicate the presence of a high velocity component in the Si ii absorption, in addition to a photospheric component. Fitting the observed spectrum with the spectral synthesis code TARDIS, the mass of unburned C in the ejecta is estimated to be ∼0.019 M⊙. The peak bolometric luminosity is $L^{\rm {bol}}_{\rm {peak}} = 1.43\times 10^{43}$ erg s−1. The radiation diffusion model fit to the bolometric light curve indicates 0.61 ± 0.02 M⊙ of 56Ni is synthesized in the explosion.

scholarly journals Aperture-corrected spectroscopic type Ia supernova host galaxy properties

2021 ◽  
Author(s):  
L. Galbany ◽  
M. Smith ◽  
S. Duarte-Puertas ◽  
S. González-Gaitán ◽  
I. Pessa ◽  
...  
Keyword(s):  
Host Galaxy ◽  
Type Ia Supernova ◽  
Type Ia
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