ESC and KAIT Observations of the Transitional Type Ia SN 2004eo
arXiv:astro-ph/0702565 · doi:10.1111/j.1365-2966.2007.11700.x
Abstract
We present optical and infrared observations of the unusual Type Ia supernova (SN) 2004eo. The light curves and spectra closely resemble those of the prototypical SN 1992A, and the luminosity at maximum (M_B = -19.08) is close to the average for a SN Ia. However, the ejected 56Ni mass derived by modelling the bolometric light curve (about 0.45 solar masses) lies near the lower limit of the 56Ni mass distribution observed in normal SNe Ia. Accordingly, SN 2004eo shows a relatively rapid post-maximum decline in the light curve (Delta m_(B) = 1.46), small expansion velocities in the ejecta, and a depth ratio Si II 5972 / Si II 6355 similar to that of SN 1992A. The physical properties of SN 2004eo cause it to fall very close to the boundary between the faint, low velocity gradient, and high velocity gradient subgroups proposed by Benetti et al. (2005). Similar behaviour is seen in a few other SNe Ia. Thus, there may in fact exist a few SNe Ia with intermediate physical properties.
28 pages, 17 figures, accepted for publication in MNRAS
References in corpus (5)
Cited by in corpus (39)
- Supernova Constraints and Systematic Uncertainties from the First 3 Years of the Supernova Legacy Survey
- Double-detonation sub-Chandrasekhar supernovae: synthetic observables for minimum helium shell mass models
- Improved Distances to Type Ia Supernovae with Two Spectroscopic Subclasses
- The Spectroscopic Diversity of Type Ia Supernovae
- SiFTO: An Empirical Method for Fitting SNe Ia Light Curves
- Type Ia Supernovae are Good Standard Candles in the Near Infrared: Evidence from PAIRITEL
- ESC Supernova spectroscopy of non-ESC targets
- The underluminous Type Ia Supernova 2005bl and the class of objects similar to SN 1991bg
- The Rise and Fall of Type Ia Supernova Light Curves in the SDSS-II Supernova Survey
- Abundance stratification in Type Ia Supernovae - II: The rapidly declining, spectroscopically normal SN 2004eo
- Theoretical Models of Optical Transients. I. A Broad Exploration of the Duration-Luminosity Phase Space
- On the fate of the secondary white dwarf in double-degenerate double-detonation Type Ia supernovae
- SN 2002cv: A Heavily Obscured Type Ia Supernova
- Sub-Chandrasekhar progenitors favoured for type Ia supernovae: Evidence from late-time spectroscopy
- Abundance stratification in Type Ia supernovae - V. SN 1986G bridging the gap between normal and subluminous SNe Ia
- Early observations of the nearby type Ia supernova SN 2015F
- Comparative Direct Analysis of Type Ia Supernova Spectra. IV. Postmaximum
- A radio-detected Type Ia supernova with helium-rich circumstellar material
- Near-infrared light curves of Type Ia supernovae: Studying the properties of the second maximum
- SN 2013aa and SN 2017cbv: Two Sibling Type Ia Supernovae in the spiral galaxy NGC 5643
- Diversity of supernovae Ia determined using equivalent widths of Si II 4000
- Comparative Direct Analysis of Type Ia Supernova Spectra. III. Premaximum
- Supernovae and Cosmology
- Carnegie Supernova Project-II: Using Near-Infrared Spectroscopy to determine the location of the outer Ni in Type Ia Supernovae
- Constraining the SN Ia Host Galaxy Dust Law Distribution and Mass Step: Hierarchical BayeSN Analysis of Optical and Near-Infrared Light Curves
- Nebular H Limits for Fast Declining Type Ia Supernovae
- A year-long plateau in the late-time near-infrared light curves of Type Ia supernovae
- A Tale of Two Type Ia Supernovae: The fast-declining siblings SNe 2015bo and 1997cn
- Nebular-Phase Spectra of Type Ia Supernovae from the Las Cumbres Observatory Global Supernova Project
- SN 2012ij: A low-luminosity type Ia supernova and evidence for continuous distribution from 91bg-like explosion to normal ones
- SN 2015bp: adding to the growing population of transitional type Ia supernovae
- Helium as a signature of the double detonation in Type Ia supernovae
- Photometric study of the late-time near-infrared plateau in Type Ia supernovae
- SN 2017hpa: A Nearby Carbon-Rich Type Ia Supernova with a Large Velocity Gradient
- SN 2019ein: A Type Ia Supernova Likely Originated from a Sub-Chandrasekhar-Mass Explosion
- Mass loss and evolution of hot massive stars
- Highly reddened type Ia supernova SN 2004ab: another case of anomalous extinction
- SN 2017fgc: A Fast-Expanding Type Ia Supernova Exploded in Massive Shell Galaxy NGC 474
- Circumstellar Medium Constraints on the Environment of Two Nearby Type Ia Supernovae: SN 2017cbv and SN 2020nlb