Supernovae and transients with circumstellar interaction

Fraser, M.

doi:10.1098/rsos.200467

Cited by 24 publications

(7 citation statements)

References 177 publications

(248 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Modern wide-field surveys are discovering a large number of transients with intrinsic luminosity between that of core-collapse supernovae (CC SNe) and classical novae (i.e., −15 M V −10 mag). These transients are often called "gap transients" (e.g., Kulkarni & Kasliwal 2009;Kasliwal 2012;Fraser 2020). They have heterogeneous observational properties, arise from different progenitors, and are likely triggered by diverse physical mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Observations of the luminous red nova AT 2021biy in the nearby galaxy NGC 4631

Cai¹,

Pastorello²,

Fraser³

et al. 2022

Preprint

View full text Add to dashboard Cite

We present an observational study of the luminous red nova (LRN) AT 2021biy in the nearby galaxy NGC 4631. The field of the object was routinely imaged during the pre-eruptive stage by synoptic surveys, but the transient was detected only at a few epochs from ∼ 231 days before maximum brightness. The LRN outburst was monitored with unprecedented cadence both photometrically and spectroscopically. AT 2021biy shows a short-duration blue peak, with a bolometric luminosity of ∼ 1.6 × 10 41 erg s −1 , followed by the longest plateau among LRNe to date, with a duration of 210 days. A late-time hump in the light curve was also observed, possibly produced by a shell-shell collision. AT 2021biy exhibits the typical spectral evolution of LRNe. Early-time spectra are characterised by a blue continuum and prominent H emission lines. Then, the continuum becomes redder, resembling that of a K-type star with a forest of metal absorption lines during the plateau phase. Finally, late-time spectra show a very red continuum (T BB ≈ 2050 K) with molecular features (e.g., TiO) resembling those of M-type stars. Spectropolarimetric analysis indicates that AT 2021biy has local dust properties similar to those of V838 Mon in the Milky Way Galaxy. Inspection of archival Hubble Space Telescope data taken on 2003 August 3 reveals a ∼ 20 M progenitor candidate with log (L/L ) = 5.0 dex and T eff = 5900 K at solar metallicity. The above luminosity and colour match those of a luminous yellow supergiant. Most likely, this source is a close binary, with a 17-24 M primary component.

show abstract

Section: Introductionmentioning

confidence: 99%

Observations of the luminous red nova AT 2021biy in the nearby galaxy NGC 4631

Cai¹,

Pastorello²,

Fraser³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…One of the most common causes of Type IIP SNe differing significantly from the norm is interaction with circumstellar material (CSM). There is a huge variety in the observed characteristics of Type II SNe affected by interaction, with many possible subclasses being the subject of ongoing debate in the literature (Fraser 2020). There is also a growing number of events which only display signatures of interaction in their earliest epochs and evolve similarly to "normal" Type IIP SNe afterwards (e.g.…”

Section: Introductionmentioning

confidence: 99%

How low can you go? SN 2018zd as a low-mass Fe core-collapse supernova

Callis¹,

Fraser²,

Pastorello³

et al. 2021

Preprint

View full text Add to dashboard Cite

We present spectroscopy and photometry of SN 2018zd, a Type IIP core-collapse supernova with signatures of interaction with circumstantial material in its earliest spectra. High ionization lines, the earmark of shock breakout, are not seen in the earliest spectral epoch, and are only seen in a single spectrum at 4.9 d after explosion. The strength and brevity of these features imply a confined circumstellar material shell in the immediate vicinity of the progenitor. Once the narrow emission lines disappear, SN 2018zd evolves similarly to a Type IIP SN, although the blue colour and enhanced plateau magnitude of SN 2018zd suggests an additional source of luminosity throughout the plateau phase. While SN 2018zd has previously been proposed as an electron-capture SN, we suggest that it is an Fe core-collapse from a low mass red supergiant progenitor. Differences in interpretation for SN 2018zd arise in part due to the large uncertainty on the distance to the host-galaxy NGC 2146, which we re-derive here to be 15.6 +6.1 −3.0 Mpc. We find the ejected 56 Ni mass for SN 2018zd to be 0.017 M , significantly higher than models of ECSNe predict. We also find the Ni/Fe ratio in SN 2018zd to be much lower that would be expected for an ECSN.

show abstract

“…−15 M V −10 mag). These transients are often called 'gap transients' (e.g., Kulkarni & Kasliwal 2009;Kasliwal 2012;Fraser 2020;Cai et al 2022). They have heterogeneous observational properties, arise from different progenitors, and are likely triggered by diverse physical mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Forbidden hugs in pandemic times

Cai

Pastorello

Fraser

et al. 2022

A&A

View full text Add to dashboard Cite

We present an observational study of the luminous red nova (LRN) AT 2021biy in the nearby galaxy NGC 4631. The field of the object was routinely imaged during the pre-eruptive stage by synoptic surveys, but the transient was detected only at a few epochs from ∼231 days before maximum brightness. The LRN outburst was monitored with unprecedented cadence both photometrically and spectroscopically. AT 2021biy shows a short-duration blue peak, with a bolometric luminosity of ∼1.6 × 1041 erg s−1, followed by the longest plateau among LRNe to date, with a duration of 210 days. A late-time hump in the light curve was also observed, possibly produced by a shell-shell collision. AT 2021biy exhibits the typical spectral evolution of LRNe. Early-time spectra are characterised by a blue continuum and prominent H emission lines. Then, the continuum becomes redder, resembling that of a K-type star with a forest of metal absorption lines during the plateau phase. Finally, late-time spectra show a very red continuum (TBB ≈ 2050 K) with molecular features (e.g., TiO) resembling those of M-type stars. Spectropolarimetric analysis indicates that AT 2021biy has local dust properties similar to those of V838 Mon in the Milky Way Galaxy. Inspection of archival Hubble Space Telescope data taken on 2003 August 3 reveals a ∼20 M⊙ progenitor candidate with log (L/L⊙) = 5.0 dex and Teff = 5900 K at solar metallicity. The above luminosity and colour match those of a luminous yellow supergiant. Most likely, this source is a close binary, with a 17–24 M⊙ primary component.

show abstract

Supernovae and transients with circumstellar interaction

Cited by 24 publications

References 177 publications

Observations of the luminous red nova AT 2021biy in the nearby galaxy NGC 4631

Observations of the luminous red nova AT 2021biy in the nearby galaxy NGC 4631

How low can you go? SN 2018zd as a low-mass Fe core-collapse supernova

Forbidden hugs in pandemic times

Contact Info

Product

Resources

About