Dust Extinction towards the Type Ia Supernova 2012cu in NGC 4772

Abstract

Using photometric and spectroscopic data of Supernova (SN) 2012cu, a fairly reddened type Ia supernova, we derived its color excess curves and probed the dust extinction in its host galaxy, NGC 4772. In order to derive the extinction as a function of wavelength (i.e., $A_{\lambda }$), we model the color excess curves of SN 2012cu in terms of dust models consisting of silicate and carbonaceous (graphite or amorphous carbon) dust. The modeled extinction law towards SN 2012cu extends flatly to the far-ultraviolet (UV) bands, which is much flatter than those of the Milky Way and Magellanic Clouds, and the 2175 $\mathring{A}$ feature is very weak or absent. The flatness of the modeled extinction curve in the UV bands suggests a "grey" extinction law of the active galactic nucleus in the vicinity of the SN 2012cu-Earth line of sight. Our results indicate that the sizes of the dust in the ISM towards SN 2012cu in NGC 4772 are larger than those of the Milky Way and the Large Magellanic Cloud, and much larger than that of the Small Magellanic Cloud. The best fitting gives an observed visual extinction towards SN 2012cu of $A_V\approx 2.6$ mag, a reddening of $E(B-V)\approx 1.0$ mag, with a total-to-selective extinction ratio $R_V\approx 2.7$, consistent with previous results.

arXiv comment29 pages, 5 figures, 2 tables

References in corpus (46)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• The chemical composition of the Sun
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• Correcting for the Effects of Interstellar Extinction
• Dust Grain Size Distributions and Extinction in the Milky Way, LMC, and SMC
• Infrared Emission from Interstellar Dust. IV. The Silicate-Graphite-PAH Model in the Post-Spitzer Era
• A 2.4% Determination of the Local Value of the Hubble Constant
• Infrared Emission from Interstellar Dust. II. The Diffuse Interstellar Medium
• A Quantitative Comparison of SMC, LMC, and Milky Way UV to NIR Extinction Curves
• An Analysis of the Shapes of Interstellar Extinction Curves. V. The IR-Through-UV Curve Morphology
• Supernova 2011fe from an Exploding Carbon-Oxygen White Dwarf Star
• A Search for "Dwarf" Seyfert Nuclei. IV. Nuclei with Broad H-alpha Emission
• Our Peculiar Motion Away from the Local Void
• Detection of circumstellar material in a normal Type Ia Supernova
• The Carnegie Supernova Project: Analysis of the First Sample of Low-Redshift Type-Ia Supernovae
• Optical Photometry of the Type Ia SN 1999ee and the Type Ib/c SN 1999ex in IC 5179
• Line derived infrared extinction towards the Galactic Center
• Spectrophotometric time series of SN 2011fe from the Nearby Supernova Factory
• Dust Spectral Energy Distributions of Nearby Galaxies: an Insight from the Herschel Reference Survey
• The Nuclear Reddening Curve for Active Galactic Nuclei and the Shape of the Infra-Red to X-Ray Spectral Energy Distribution
• Hubble Space Telescope spectra of the type Ia supernova SN2011fe: a tail of low-density, high-velocity material with Z<Zsolar
• Low R_v from circumstellar dust around supernovae
• Extensive HST Ultraviolet Spectra and Multi-wavelength Observations of SN 2014J in M82 Indicate Reddening and Circumstellar Scattering by Typical Dust
• Dust around Type Ia supernovae
• The rise of SN2014J in the nearby galaxy M82
• Dust Grain-Size Distributions From MRN to MEM
• Atmospheric extinction properties above Mauna Kea from the Nearby Supernova Factory spectro-photometric data set
• Diversity in extinction laws of Type Ia supernovae measured between $0.2$ and $2\mu \mathrm{m}$
• The peculiar extinction law of SN2014J measured with The Hubble Space Telescope
• Optical Observations of the Type Ia Supernova 2011fe in M101 for Nearly 500 Days
• The colour-lightcurve shape relation of Type Ia supernovae and the reddening law
• The Nordic Optical Telescope
• Extinction due to amorphous carbon grains in red quasars from the SDSS
• Kinematic Evidence of Minor Mergers in Normal Sa Galaxies: NGC3626, NGC3900, NGC4772 and NGC5854
• Multi-epoch high-resolution spectroscopy of SN2011fe - Linking the progenitor to its environment
• Swift Ultraviolet Observations of Supernova 2014J in M82: Large Extinction from Interstellar Dust
• Modeling the Infrared Interstellar Extinction
• Physical Dust Models for the Extinction toward Supernova 2014J in M82
• AGN Reddening and Ultraviolet Extinction Curves from Hubble Space Telescope Spectra
• Interstellar-Medium Mapping in M82 Through Light Echoes Around Supernova 2014J
• Determining Type Ia Supernovae Host galaxy extinction probabilities and a statistical approach to estimating the absorption-to-reddening ratio $R_V$
• The Extinction Properties of and Distance to the Highly Reddened Type Ia Supernova SN 2012cu
• Modeling the Infrared Extinction toward the Galactic Center
• Properties of interstellar dust responsible for extinction laws with unusually low total-to-selective extinction ratios of Rv=1-2
• Dust in Active Galactic Nuclei

Cited by in corpus (5)

• Dust Extinction Law in Nearby Star-Resolved Galaxies. I. M31 Traced by Supergiants
• Dust Extinction Law in Nearby Star-Resolved Galaxies. II. M33 Traced by Supergiants
• Dust Models for the Extinction of Type IIn Supernova SN 2010jl
• The Effects of Circumstellar Dust Scattering on the Light Curves and Polarizations of Type Ia Supernovae
• An Improved Pair Method to Probe the Dust Extinction Law