AT 2019abn: multi-wavelength observations over the first 200 days

Williams, S. C.; Jones, David; Pessev, Peter; Geier, S.; Corradi, R. L. M.; Hook, I. M.; Darnley, M. J.; Pejcha, Ondřej; Núñez, Agustín Riscos; Meingast, Stefan; Moran, S.

doi:10.1051/0004-6361/201937286

Cited by 13 publications

(6 citation statements)

References 53 publications

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“…Light curves for SN 2008S-like transients[95][96][97][98]. The black line shows the expected decline rate from the decay of56 Co.3Although some objects continue to blur the apparent boundaries between ILRTs and other classes[99,100].…”

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confidence: 99%

Supernovae and transients with circumstellar interaction

Fraser

2020

R. Soc. open sci.

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It is 30 years since the characteristic signatures of interaction with circumstellar material (CSM) were first observed in a core-collapse supernova. Since then, CSM interaction has been observed and inferred across a range of transients, from the low-energy explosions of low-mass stars as likely electron-capture supernovae, through to the brightest superluminous supernovae. In this review, I present a brief overview of some of the interacting supernovae and transients that have been observed to date, and attempt to classify and group them together in a phenomenological framework.

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confidence: 99%

Supernovae and transients with circumstellar interaction

Fraser

2020

R. Soc. open sci.

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“…A recently discovered likely member of this class, M51 OT2019-1 (AT 2019abn), had a massive, self-obscured progenitor similar to the two class prototypes, and it was shown to be variable in the 12 years of available pre-outburst archival imaging with Spitzer/IRAC (Jencson et al 2019a). An extended phase of early circumstellar dust destruction observed during the rise of this transient disfavors a terminalexplosion scenario, strengthening the connection between ILRTs and giant eruptions of LBVs (Jencson et al 2019a;Williams et al 2020).…”

Section: Spirits Variables and "Sprite"smentioning

confidence: 67%

Hubble Space Telescope Imaging of Luminous Extragalactic Infrared Transients and Variables from the SPIRITS Survey

Bond,

Jencson,

Whitelock

et al. 2022

Preprint

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SPIRITS-the SPitzer InfraRed Intensive Transients Survey-searched for luminous infrared (IR) transients and variables in nearly 200 nearby galaxies from 2014 to 2019, using the warm Spitzer telescope at 3.6 and 4.5 µm. Among the SPIRITS variables are IR-bright objects that are undetected in ground-based optical surveys. We classify them as (1) transients, (2) periodic variables, and (3) irregular variables. The transients include "SPRITE"s (eSPecially Red Intermediate-luminosity Transient Events), having maximum luminosities fainter than supernovae, red IR colors, and a wide range of outburst durations (days to years). Here we report deep optical and near-IR imaging with the Hubble Space Telescope (HST) of 21 SPIRITS variables. They were initially considered SPRITE transients, but many eventually proved instead to be periodic or irregular variables as more data were collected. HST images show most of these cool and dusty variables are associated with star-forming regions in late-type galaxies, implying an origin in massive stars. Two SPRITEs lacked optical progenitors in deep pre-outburst HST images; however, one was detected during eruption at J and H, indicating a dusty object with an effective temperature of ∼1050 K. One faint SPRITE turned out to be a dusty classical nova. About half the HST targets proved to be periodic variables, with pulsation periods of 670-2160 days; they are likely dusty asymptotic-giant-branch (AGB) stars with masses of ∼5-10 M . A few of them were warm enough to be detected in deep HST frames, but most are too cool. Out of six irregular variables, two were red supergiants with optical counterparts in HST images; four were too enshrouded for HST detection. SPIRITS: SEARCHING FOR EXTRAGALACTIC INFRARED TRANSIENTS AND VARIABLESSeveral classes of luminous variable stars and optical transients (OTs) have been known for many decades-most famously supernovae (SNe), classical novae (CNe), and luminous blue variables (LBVs).

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“…The [Ca ii] doublet is normally visible during the entire monitoring campaign. However, the study of AT 2019abn challenges this paradigm with a barely detectable [Ca ii] doublet at early phases (Jencson et al 2019;Williams et al 2020). In addition, this feature is never detected in SNe IIP at early phases (see Figure 9), while it is always visible in the nebular phases.…”

Section: Observables and Parameter Correlationsmentioning

confidence: 98%

Intermediate-luminosity red transients: Spectrophotometric properties and connection to electron-capture supernova explosions

Cai,

Pastorello,

Fraser

et al. 2021

Preprint

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We present the spectroscopic and photometric study of five intermediate-luminosity red transients (ILRTs), namely AT 2010dn, AT 2012jc, AT 2013la, AT 2013lb, and AT 2018aes. They share common observational properties and belong to a family of objects similar to the prototypical ILRT SN 2008S. These events have a rise time that is less than 15 days and absolute peak magnitudes of between −11.5 and −14.5 mag. Their pseudo-bolometric light curves peak in the range 0.5 -9.0 × 10 40 erg s −1 and their total radiated energies are on the order of (0.3 -3) × 10 47 erg. After maximum brightness, the light curves show a monotonic decline or a plateau, resembling those of faint supernovae IIL or IIP, respectively. At late phases, the light curves flatten, roughly following the slope of the 56 Co decay. If the late-time power source is indeed radioactive decay, these transients produce 56 Ni masses on the order of 10 −4 to 10 −3 M . The spectral energy distribution of our ILRT sample, extending from the optical to the mid-infrared (MIR) domain, reveals a clear IR excess soon after explosion and non-negligible MIR emission at very late phases. The spectra show prominent H lines in emission with a typical velocity of a few hundred km s −1 , along with Ca II features. In particular, the [Ca ii] λ7291,7324 doublet is visible at all times, which is a characteristic feature for this family of transients. The identified progenitor of SN 2008S, which is luminous in archival Spitzer MIR images, suggests an intermediate-mass precursor star embedded in a dusty cocoon. We propose the explosion of a super-asymptotic giant branch star forming an electron-capture supernova as a plausible explanation for these events.

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AT 2019abn: multi-wavelength observations over the first 200 days

Cited by 13 publications

References 53 publications

Supernovae and transients with circumstellar interaction

Supernovae and transients with circumstellar interaction

Hubble Space Telescope Imaging of Luminous Extragalactic Infrared Transients and Variables from the SPIRITS Survey

Intermediate-luminosity red transients: Spectrophotometric properties and connection to electron-capture supernova explosions

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