Optical and Ultraviolet Observations of the Narrow-Lined Type Ia SN 2012fr in NGC 1365

Abstract

Extensive optical and ultraviolet (UV) observations of the type Ia supernova (SN Ia) 2012fr are presented in this paper. It has a relatively high luminosity, with an absolute $B$-band peak magnitude of about $-19.5$ mag and a smaller post-maximum decline rate than normal SNe Ia [e.g., $\Delta m_{15}$($B$) $=0.85\pm 0.05$ mag]. Based on the UV and optical light curves, we derived that a ${}^{56}$Ni mass of about 0.88 solar masses was synthesized in the explosion. The earlier spectra are characterized by noticeable high-velocity features of \ion{Si}{2} $\lambda$6355 and \ion{Ca}{2} with velocities in the range of $\sim 22,000$--$25,000$ km s${}^{-1}$. At around the maximum light, these spectral features are dominated by the photospheric components which are noticeably narrower than normal SNe Ia. The post-maximum velocity of the photosphere remains almost constant at $\sim$12,000 km s${}^{-1}$ for about one month, reminiscent of the behavior of some luminous SNe Ia like SN 1991T. We propose that SN 2012fr may represent a subset of the SN 1991T-like SNe Ia viewed in a direction with a clumpy or shell-like structure of ejecta, in terms of a significant level of polarization reported in Maund et al. (2013).

14 pages, 11 figures, 9tables. Accepted for publication in AJ

References in corpus (8)

• CfA3: 185 Type Ia Supernova Light Curves from the CfA
• Improved Distances to Type Ia Supernovae with Two Spectroscopic Subclasses
• The Spectroscopic Diversity of Type Ia Supernovae
• Secondary Maximum in the Near-Infrared Lightcurves of Type Ia Supernovae
• Optical and Near-Infrared Observations of the Highly Reddened, Rapidly Expanding Type Ia Supernova 2006X in M100
• Evidence for Two Distinct Populations of Type Ia Supernovae
• Comparative Direct Analysis of Type Ia Supernova Spectra. V. Insights from A Larger Sample and Quantitative Subclassification
• Spectropolarimetric diagnostics of thermonuclear supernova explosions

Cited by in corpus (45)

• Mass-accreting white dwarfs and type Ia supernovae
• Lijiang 2.4-meter Telescope and its Instruments
• Measuring nickel masses in Type Ia supernovae using cobalt emission in nebular phase spectra
• Nebular-Phase Spectra of Nearby Type Ia Supernovae
• SN 2012fr: Ultraviolet, Optical, and Near-Infrared Light Curves of a Type Ia Supernova Observed Within a Day of Explosion
• Surface Radioactivity or Interactions? Multiple Origins of Early-excess Type Ia Supernovae and Associated Subclasses
• Determining the ${}^{56}$Ni distribution of type Ia supernovae from observations within days of explosion
• SN 2016coi/ASASSN-16fp: An example of residual helium in a type Ic supernova?
• On the Ca-strong 1991bg-like type Ia supernova 2016hnk: evidence for a Chandrasekhar-mass explosion
• Swift Ultraviolet Observations of Supernova 2014J in M82: Large Extinction from Interstellar Dust
• The Silicon and Calcium High-Velocity Features in Type Ia Supernovae from Early to Maximum Phases
• Berkeley Supernova Ia Program: Data Release of 637 Spectra from 247 Type Ia Supernovae
• The $\gamma$-ray deposition histories of core-collapse supernovae
• Optical and Ultraviolet Observations of A Low-Velocity Type II-Plateau Supernova 2013am in M65
• Planetary Nebula Luminosity Function distances for 19 galaxies observed by PHANGS-MUSE
• Constraining the pitch angle of the Galactic spiral arms in the Milky Way
• SDSS J013127.34$-$032100.1: A newly discovered radio-loud quasar at $z=5.18$ with extremely high luminosity
• The Oxygen Features in Type Ia Supernovae and the Implications for the Nature of Thermonuclear Explosions
• Can Helium-detonation Model Explain the Observed Diversity of Type Ia Supernovae?
• UV-Optical Observation of Type Ia Supernova SN 2013dy in NGC 7250
• A Luminous Peculiar Type Ia Supernova SN 2011hr: More Like SN 1991T or SN 2007if?
• The 1999aa-like Type Ia Supernova iPTF14bdn in the Ultraviolet and Optical
• Discovery and Follow-up Observations of the Young Type Ia Supernova 2016coj
• Extended Optical/NIR Observations of Type Iax Supernova 2014dt: Possible Signatures of a Bound Remnant
• Optical and Near-Infrared Observations of the Nearby Type Ia Supernova 2017cbv
• VLBI observation of the newly discovered z=5.18 quasar SDSS J0131-0321
• Optical observations of a SN 2002cx-like peculiar supernova SN 2013en in UGC 11369
• Optical Observations of the Young Type Ic Supernova SN 2014L in M99
• Optical Observations of the 2002cx-like Supernova 2014ek, and Characterizations of SNe Iax
• Over 500 Days in the Life of the Photosphere of the Type Iax Supernova SN 2014dt
• A Polarization Sequence for Type Ia Supernovae?
• The Early Light Curve of a Type Ia Supernova 2021hpr in NGC 3147: Progenitor Constraints with the Companion Interaction Model
• SN 2015bq: A Luminous Type Ia Supernova with Early Flux Excess
• Photometric study of the late-time near-infrared plateau in Type Ia supernovae
• SN 2017hpa: A carbon-rich type Ia supernova
• SN 2019ein: A Type Ia Supernova Likely Originated from a Sub-Chandrasekhar-Mass Explosion
• Observations of A Fast-Expanding and UV-Bright Type Ia Supernova SN 2013gs
• Investigating the Unusual Spectroscopic Time-Evolution in SN 2012fr
• Narrow Transient Absorptions in Late-Time Optical Spectra of Type Ia Supernovae: Evidence for Large Clumps of Iron-Rich Ejecta?
• Characterization of Supernovae Based on the Spectral-Temporal Energy Distribution: Possible two SN Ib Subtypes
• SN 2014J in M82: New Insights On the Spectral Diversity of Type Ia Supernovae
• The environments of Type Ia supernovae with different relative equivalent width of Si II feature in their spectra
• Discovery of two broad absorption line quasars at redshift about 4.75 using the Lijiang 2.4m telescope
• Exploring the origins of high-velocity features in SNe Ia with the spectral synthesis code TARDIS
• Prospects of the multi-channel photometric survey telescope in the cosmological application of Type Ia supernovae