Early-time spectroscopic modelling of the transitional Type Ia Supernova 2021rhu with TARDIS
arXiv:2304.10129 · doi:10.1093/mnras/stad1226
Abstract
An open question in SN Ia research is where the boundary lies between 'normal' Type Ia supernovae (SNe Ia) that are used in cosmological measurements and those that sit off the Phillips relation. We present the spectroscopic modelling of one such '86G-like' transitional SN Ia, SN 2021rhu, that has recently been employed as a local Hubble Constant calibrator using a tip of the red-giant branch measurement. We detail its modelling from -12 d until maximum brightness using the radiative-transfer spectral-synthesis code tardis. We base our modelling on literature delayed-detonation and deflagration models of Chandrasekhar mass white dwarfs, as well as the double-detonation models of sub-Chandrasekhar mass white dwarfs. We present a new method for 'projecting' abundance profiles to different density profiles for ease of computation. Due to the small velocity extent and low outer densities of the W7 profile, we find it inadequate to reproduce the evolution of SN 2021rhu as it fails to match the high-velocity calcium components. The host extinction of SN 2021rhu is uncertain but we use modelling with and without an extinction correction to set lower and upper limits on the abundances of individual species. Comparing these limits to literature models we conclude that the spectral evolution of SN 2021rhu is also incompatible with double-detonation scenarios, lying more in line with those resulting from the delayed detonation mechanism (although there are some discrepancies, in particular a larger titanium abundance in SN 2021rhu compared to the literature). This suggests that SN 2021rhu is likely a lower luminosity, and hence lower temperature, version of a normal SN Ia.
25 pages, 22 figures, accepted for publication in MNRAS
References in corpus (60)
- 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
- A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km/s/Mpc Uncertainty from the Hubble Space Telescope and the SH0ES Team
- The Zwicky Transient Facility: System Overview, Performance, and First Results
- The Swift Ultra-Violet/Optical Telescope
- The Zwicky Transient Facility: Data Processing, Products, and Archive
- X-shooter, the new wide band intermediate resolution spectrograph at the ESO Very Large Telescope
- SALT2: using distant supernovae to improve the use of Type Ia supernovae as distance indicators
- The Zwicky Transient Facility: Science Objectives
- astroquery: An Astronomical Web-Querying Package in Python
- The Reddening-Free Decline Rate Versus Luminosity Relationship for Type Ia Supernovae
- Automated data reduction workflows for astronomy
- An Analysis of the Shapes of Interstellar Extinction Curves. V. The IR-Through-UV Curve Morphology
- The Supernova Legacy Survey 3-year sample: Type Ia Supernovae photometric distances and cosmological constraints
- Measurements of the Hubble Constant: Tensions in Perspective
- Three-dimensional delayed-detonation models with nucleosynthesis for Type Ia supernovae
- A Digital Archive of HI 21 cm Line Spectra of Optically-targeted Galaxies
- Double-detonation sub-Chandrasekhar supernovae: can minimum helium shell masses detonate the core?
- An Open Catalog for Supernova Data
- Evidence for a Spectroscopic Sequence Among SNe Ia
- The Zwicky Transient Facility: Observing System
- On the Source of the Dust Extinction in Type Ia Supernovae and the Discovery of Anomalously Strong Na I Absorption
- SOUSA: the Swift Optical/Ultraviolet Supernova Archive
- The Automated Palomar 60-Inch Telescope
- The SED Machine: a robotic spectrograph for fast transient classification
- Constraining Type Ia supernova models: SN 2011fe as a test case
- A New Cepheid Distance to the Giant Spiral M101 Based On Image Subtraction of HST/ACS Observations
- What Can We Learn from the Rising Lightcurves of Radioactively-Powered Supernovae?
- The properties of the peculiar Type Ia SN~1991bg. Analysis and discussion of two years of observations
- Thermonuclear .Ia Supernovae from Helium Shell Detonations: Explosion Models and Observables
- A spectral synthesis code for rapid modelling of supernovae
- An Updated Ultraviolet Calibration for the Swift/UVOT
- The Extremes of Thermonuclear Supernovae
- A Fully Automated Integral Field Spectrograph Pipeline for the SEDMachine: pysedm
- The Rising Light Curves of Type Ia Supernovae
- BVRI lightcurves of supernovae SN 2011fe in M101, SN 2012aw in M95, and SN 2012cg in NGC 4424
- Synthetic light curves and spectra for three-dimensional delayed-detonation models of Type Ia supernovae
- Comparing Tip of the Red Giant Branch Distance Scales: An Independent Reduction of the Carnegie-Chicago Hubble Program and the Value of the Hubble Constant
- The Discovery of Cepheids and a Distance to NGC 5128
- The Outermost Ejecta of Type Ia Supernovae
- Exploring the spectral diversity of low-redshift Type Ia supernovae using the Palomar Transient Factory
- Abundance stratification in Type Ia Supernovae - II: The rapidly declining, spectroscopically normal SN 2004eo
- Analysis of the Early-Time Optical Spectra of SN 2011fe in M101
- Searching for swept-up Hydrogen and Helium in the late-time spectra of 11 nearby Type Ia supernovae
- Double detonations of sub-Chandrasekhar mass CO white dwarfs: Can different core and He shell masses explain variations of Type Ia supernovae?
- Two transitional type~Ia supernovae located in the Fornax cluster member NGC 1404: SN 2007on and SN 2011iv
- ZTF Early Observations of Type Ia Supernovae II: First Light, the Initial Rise, and Time to Reach Maximum Brightness
- Non-Local Thermodynamic Equilibrium Radiative Transfer Simulations of Sub-Chandrasekhar-Mass White Dwarf Detonations
- Transient Double-beam Spectrograph for the 2.5-m Telescope of the Caucasus Mountain Observatory of SAI MSU
- New Modules for the SEDMachine to Remove Contaminations from Cosmic Rays and Non-target Light: BYECR and CONTSEP
- Abundance stratification in Type Ia Supernovae - IV: the luminous, peculiar SN 1991T
- Abundance stratification in Type Ia supernovae - V. SN 1986G bridging the gap between normal and subluminous SNe Ia
- Type Ia Supernova Sub-classes and Progenitor Origin
- Abundance stratification in Type Ia supernovae - III. The normal SN 2003du
- Abundance Tomography of Type Iax SN 2011ay with TARDIS
- Double detonations: variations in Type Ia supernovae due to different core and He shell masses -- II: synthetic observables
- An analysis of the spectroscopic signatures of layering in the ejecta of type Iax supernovae
- Transitional events in the spectrophotometric regime between stripped envelope and superluminous supernovae
- Abundance stratification in type Ia supernovae -- VI: the peculiar slow decliner SN\,1999aa