Observations of A Fast-Expanding and UV-Bright Type Ia Supernova SN 2013gs

Abstract

In this paper, we present extensive optical and ultraviolet (UV) observations of the type Ia supernova (SN Ia) 2013gs discovered during the Tsinghua-NAOC Transient Survey. The photometric observations in the optical show that the light curves of SN 2013gs is similar to that of normal SNe Ia, with an absolute peak magnitude of $M_B$ = $-$19.25 $\pm$ 0.15 mag and a post-maximum decline rate $\Delta$m${}_{15}$(B) = 1.00 $\pm$ 0.05 mag. \emph{Gehrels Swift} UVOT observations indicate that SN 2013gs shows unusually strong UV emission (especially in the $uvw1$ band) at around the maximum light (M${}_{uvw1}$ $\sim$ $-$18.9 mag). The SN is characterized by relatively weak Fe~{\sc ii} {\sc iii} absorptions at $\sim$ 5000Å in the early spectra and a larger expansion velocity ($v_{Si}$ $\sim$ 13,000 km s${}^{-1}$ around the maximum light) than the normal-velocity SNe Ia. We discuss the relation between the $uvw1-v$ color and some observables, including Si~{\sc ii} velocity, line strength of Si~{\sc ii} $\lambda$6355, Fe~{\sc ii}/{\sc iii} lines and $\Delta m_{15}$(B). Compared to other fast-expanding SNe Ia, SN 2013gs exhibits Si and Fe absorption lines with similar strength and bluer $uvw1-v$ color. We briefly discussed the origin of the observed UV dispersion of SNe Ia.

arXiv comment31 pages, 10 figures, accepted to publish in ApJ

References in corpus (69)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The Swift Ultra-Violet/Optical Telescope
• Observational clues to the progenitors of Type-Ia supernovae
• The Reddening-Free Decline Rate Versus Luminosity Relationship for Type Ia Supernovae
• The HST Key Project on the Extragalactic Distance Scale. XXVIII. Combining the Constraints on the Hubble Constant
• The Updated Zwicky Catalog (UZC)
• Seeing the Collision of a Supernova with its Companion Star
• Detection of circumstellar material in a normal Type Ia Supernova
• The diversity of Type Ia Supernovae: evidence for systematics?
• Progenitors of type Ia supernovae
• Evidence for a Spectroscopic Sequence Among SNe Ia
• Type Ia Supernovae: Influence of the Initial Composition on the Nucleosynthesis, Light Curves, Spectra and Consequences for the Determination of Omega_M & Lambda
• SN 2002cx: The Most Peculiar Known Type Ia Supernova
• PTF11kx: A Type-Ia Supernova with a Symbiotic Nova Progenitor
• Berkeley Supernova Ia Program I: Observations, Data Reduction, and Spectroscopic Sample of 582 Low-Redshift Type Ia Supernovae
• On Variations in the Peak Luminosity of Type Ia Supernovae
• Constraints on the Progenitor System of the Type Ia Supernova SN 2011fe/PTF11kly
• SALT: a Spectral Adaptive Light curve Template for Type Ia Supernovae
• Comparative Direct Analysis of Type Ia Supernova Spectra. II. Maximum Light
• Improved Distances to Type Ia Supernovae with Two Spectroscopic Subclasses
• SOUSA: the Swift Optical/Ultraviolet Supernova Archive
• Circumstellar Material in Type Ia Supernovae via Sodium Absorption Features
• Supernova 2002bo: inadequacy of the single parameter description
• Ultraviolet Light Curves of Supernovae with Swift Uvot
• Optical and Near-Infrared Observations of the Highly Reddened, Rapidly Expanding Type Ia Supernova 2006X in M100
• What Can We Learn from the Rising Lightcurves of Radioactively-Powered Supernovae?
• Evidence for Two Distinct Populations of Type Ia Supernovae
• SN 2003du: 480 days in the Life of a Normal Type Ia Supernova
• Metallicity Effects in NLTE Model Atmospheres of Type Ia Supernovae
• An Updated Ultraviolet Calibration for the Swift/UVOT
• A Golden Standard Type Ia Supernova SN 2005cf: Observations from the Ultraviolet to the Near-Infrared Wavebands
• PPM-Extended (PPMX) - a catalogue of positions and proper motions
• A Preliminary Indication of Evolution of Type Ia Supernovae from their Risetimes
• Very Early Ultraviolet and Optical Observations of the Type Ia Supernova 2009ig
• Optical and Infrared Photometry of the Type Ia Supernovae 1991T, 1991bg, 1999ek, 2001bt, 2001cn, 2001cz, and 2002bo
• Setting UBVRI Photometric Zero-Points Using Sloan Digital Sky Survey ugriz Magnitudes
• A Swift Look at SN 2011fe: The Earliest Ultraviolet Observations of a Type Ia Supernova
• The Rise and Fall of Type Ia Supernova Light Curves in the SDSS-II Supernova Survey
• The Absolute Magnitudes of Type Ia Supernovae in the Ultraviolet
• Supernova rates from the SUDARE VST-Omegacam search. I
• ESC observations of SN 2005cf. I. Photometric Evolution of a Normal Type Ia Supernova
• The Very Young Type Ia Supernova 2013dy: Discovery, and Strong Carbon Absorption in Early-Time Spectra
• Lower limits on the Hubble Constant from models of Type Ia Supernovae
• Studying the Diversity of Type Ia Supernovae in the Ultraviolet: Comparing Models with Observations
• Optical Observations of the Type Ia Supernova 2011fe in M101 for Nearly 500 Days
• Properties of the ultraviolet flux of type Ia supernovae: an analysis with synthetic spectra of SN 2001ep and SN 2001eh
• Determination of the Hubble constant, the intrinsic scatter of luminosities of Type Ia SNe, and evidence for non-standard dust in other galaxies
• The Young and Bright Type Ia Supernova ASASSN-14lp: Discovery, Early-Time Observations, First-Light Time, Distance to NGC 4666, and Progenitor Constraints
• The Photometric System of Tsinghua-NAOC 80-cm Telescope at NAOC Xinglong Observatory
• A Novel Color Parameter As A Luminosity Calibrator for Type Ia Supernovae
• Near-Ultraviolet Properties of a Large Sample of Type Ia Supernovae as Observed with the Swift UVOT
• Constraints on Type Ia Supernova Progenitor Companions from Early Ultraviolet Observations with Swift
• The double-degenerate, super-Chandrasekhar nucleus of the planetary nebula Henize 2-428
• Detonating Failed Deflagration Model of Thermonuclear Supernovae II. Comparison to Observations
• SN 2012fr: Ultraviolet, Optical, and Near-Infrared Light Curves of a Type Ia Supernova Observed Within a Day of Explosion
• The Progenitor of the Type Ia Supernova that created SNR 0519-69.0 in the Large Magellanic Cloud
• Optical and Ultraviolet Observations of the Narrow-Lined Type Ia SN 2012fr in NGC 1365
• The early spectral evolution of SN 2004dt
• Evidence for Type Ia Supernova Diversity from Ultraviolet Observations with the Hubble Space Telescope
• Grouping Normal Type Ia Supernovae by UV to Optical Color Differences
• The Silicon and Calcium High-Velocity Features in Type Ia Supernovae from Early to Maximum Phases
• The Oxygen Features in Type Ia Supernovae and the Implications for the Nature of Thermonuclear Explosions
• Optical Observations of the Rapidly Expanding Type Ia Supernova 2007gi
• Reddened, Redshifted, or Intrinsically Red? Understanding Near-Ultraviolet Colors of Type Ia Supernovae
• Theoretical Clues to the Ultraviolet Diversity of Type Ia Supernovae
• The THU-NAOC Transient Survey: the Performance and the First-year Result

Cited by in corpus (5)

• A mass-dependent slope of the galaxy size-mass relation out to z~3: further evidence for a direct relation between median galaxy size and median halo mass
• The Isaac Newton Telescope monitoring survey of Local Group dwarf galaxies. I. Survey overview and first results for Andromeda I
• SN 2015bq: A Luminous Type Ia Supernova with Early Flux Excess
• Differential interferometry of close binary of supermassive black holes in an elliptical configuration
• SN 2017fgc: A Fast-Expanding Type Ia Supernova Exploded in Massive Shell Galaxy NGC 474