Variable H$\alpha$ Emission in the Nebular Spectra of the Low-Luminosity Type Ia SN2018cqj/ATLAS18qtd

Abstract

We present optical photometry and spectroscopy of the Type Ia supernova SN2018cqj/ATLAS18qtd. The supernova exploded in an isolated region at $\sim 65$~kpc from the S0 galaxy IC~550 at $z=0.0165$ ($D\approx 74$~Mpc) and has a redshift consistent with a physical association to this galaxy. Multicolor photometry show that SN2018cqj/ATLAS18qtd is a low-luminosity ($M_{B_{max}}\approx -17.9$ mag), fast-declining Type Ia with color stretch $s_{BV}\approx 0.6$ and $B$-band decline rate $\Delta m_{15}(B)\approx 1.77$ mag. Two nebular-phase spectra obtained as part of the 100IAS survey at +193 and +307 days after peak show the clear detection of a narrow H$\alpha$ line in emission that is resolved in the first spectrum with $\mathrm{FWHM}\approx 1200$ km s${}^{-1}$ and $L_{H\alpha }\approx 3.8\times 10^{37}$ erg s${}^{-1}$. The detection of a resolved H$\alpha$ line with a declining luminosity is broadly consistent with recent models where hydrogen is stripped from the non-degenerate companion in a single-degenerate progenitor system. However, the amount of hydrogen consistent with the luminosities of the H$\alpha$ line would be $\sim 10^{-3}$ M${}_{\odot }$, significantly less than theoretical model predictions in the classical single-degenerate progenitor systems. SN2018cqj/ATLAS18qtd is the second low-luminosity, fast-declining Type Ia SN after SN2018fhw/ASASSN-18tb that shows narrow H$\alpha$ in emission in its nebular-phase spectra.

arXiv commentAccepted for publication in ApJ

References in corpus (63)

• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
• The observed properties of dwarf galaxies in and around the Local Group
• Overview of the DESI Legacy Imaging Surveys
• A method for optimal image subtraction
• ATLAS: A High-Cadence All-Sky Survey System
• Las Cumbres Observatory Global Telescope Network
• The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
• The 6dF Galaxy Survey: Final Redshift Release (DR3) and Southern Large-Scale Structures
• Observational clues to the progenitors of Type-Ia supernovae
• The Reddening-Free Decline Rate Versus Luminosity Relationship for Type Ia Supernovae
• WISeREP - An Interactive Supernova Data Repository
• Determining the Type, Redshift, and Age of a Supernova Spectrum
• The single degenerate channel for the progenitors of type Ia supernovae
• Evidence for an asymptotic giant branch star in the progenitor system of a type Ia supernova
• Detection of circumstellar material in a normal Type Ia Supernova
• Progenitors of type Ia supernovae
• Type Ia Supernova Explosions in Binary Systems: The Impact on the Secondary Star and its Consequences
• PTF11kx: A Type-Ia Supernova with a Symbiotic Nova Progenitor
• The Carnegie Supernova Project: Light Curve Fitting with SNooPy
• Circumstellar Material in Type Ia Supernovae via Sodium Absorption Features
• Type Ia Supernovae Strongly Interacting with Their Circumstellar Medium
• Constraining the Type Ia Supernova Progenitor: The Search for Hydrogen in Nebular Spectra
• A New Cepheid Distance to the Giant Spiral M101 Based On Image Subtraction of HST/ACS Observations
• The Progenitors of Type Ia Supernovae
• On the Progenitors of Type Ia Supernovae
• The Carnegie Supernova Project: Absolute Calibration and the Hubble Constant
• The properties of the peculiar Type Ia SN~1991bg. Analysis and discussion of two years of observations
• Late-time spectral line formation in Type IIb supernovae, with application to SN 1993J, SN 2008ax, and SN 2011dh
• Single-degenerate type Ia supernovae without hydrogen contamination
• Early and late time VLT spectroscopy of SN 2001el - progenitor constraints for a type Ia supernova
• Supernovae in Early-Type Galaxies: Directly Connecting Age and Metallicity with Type Ia Luminosity
• Spin-Up/Spin-Down models for Type Ia Supernovae
• Uncloaking globular clusters in the inner Galaxy
• BVRI lightcurves of supernovae SN 2011fe in M101, SN 2012aw in M95, and SN 2012cg in NGC 4424
• No Stripped Hydrogen in the Nebular Spectra of Nearby Type Ia Supernova 2011fe
• Three-dimensional simulations of the interaction between Type Ia supernova ejecta and their main sequence companions
• Type Ia Supernovae with Bi-Modal Explosions Are Common -- Possible Smoking Gun for Direct Collisions of White-Dwarfs
• Searching for swept-up Hydrogen and Helium in the late-time spectra of 11 nearby Type Ia supernovae
• Two transitional type~Ia supernovae located in the Fornax cluster member NGC 1404: SN 2007on and SN 2011iv
• Hydrogen and helium in the spectra of Type Ia supernovae
• No trace of a single-degenerate companion in late spectra of SNe 2011fe and 2014J
• Strong Evidence Against A Non-Degenerate Companion in SN 2012cg
• Single Degenerate Models for Type Ia Supernovae Progenitor's Evolution and Nucleosythesis Yields
• Nebular-Phase Spectra of Nearby Type Ia Supernovae
• The 6dF Galaxy Survey: Fundamental Plane Data
• Multidimensional Models of Type Ia Supernova Nebular Spectra: Strong Emission Lines from Stripped Companion Gas Rule Out Classic Single Degenerate Systems
• Nebular Spectra of 111 Type Ia Supernovae Disfavor Single Degenerate Progenitors
• ASASSN-18tb: A Most Unusual Type Ia Supernova Observed by TESS and SALT
• Nebular Spectroscopy of the `Blue Bump' Type Ia Supernova 2017cbv
• H-$\alpha$ emission in the nebular spectrum of the Type Ia supernova ASASSN-18tb
• No Stripped Companion Material in the Nebular Spectrum of the "Two-Component" Type Ia Supernova ASASSN-18bt
• Delayed Circumstellar Interaction for Type Ia SN 2015cp Revealed by an HST Ultraviolet Imaging Survey
• Imprints of the ejecta-companion interaction in Type Ia supernovae: main sequence, subgiant, and red giant companions
• Nebular Spectroscopy of Kepler's Brightest Supernova
• The first 48: Discovery and progenitor constraints on the Type Ia supernova 2013gy
• ASASSN-15pz: Revealing Significant Photometric Diversity among 2009dc-like, Peculiar SNe Ia
• The origin of the H$\alpha$-like structure in nebular spectra of type IIb supernovae
• A Significantly off-center Ni56 Distribution for the Low-Luminosity Type Ia Supernova SN 2016brx from the 100IAS survey
• SN1991bg-like supernovae are associated with old stellar populations
• Nebular H$\alpha$ Limits for Fast Declining Type Ia Supernovae
• An Empirical Fitting Method for Type Ia Supernova Light Curves. II. Estimating the First-Light Time and Rise Time
• VLT Optical BVR observations of two bright Supernova Ia hosts in the Virgo cluster

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