Gap Transients Interacting with Circumstellar Medium

Cai, Yongzhi; Reguitti, A.; Valerin, G.

doi:10.3390/universe8100493

Cited by 9 publications

(6 citation statements)

References 171 publications

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“…About five orders of magnitude separate the peak luminosity of the faintest Galactic objects such as OGLE 2002-BLG-360 (Tylenda et al 2013) and V1309 Sco (Mason et al 2010;Tylenda et al 2011) from bright extragalactic events (0 M V −15 mag; see, e.g., the sample presented by Pastorello et al 2019a). The latter objects, with Tables A1-A3 are only available at the CDS via anonymous ftp to cdsarc.cds.unistra.fr (130.79.128.5) or via https:// cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/671/A158 intermediate luminosity between those of classical novae and core-collapse supernovae, are 'gap transients' (Kasliwal 2012;Cai et al 2022a). LRNe have structured light curves, with a phase of slowly rising luminosity lasting months to years, followed by a major outburst.…”

Section: Introductionmentioning

confidence: 99%

Forbidden hugs in pandemic times

Pastorello

Valerin

Fraser

et al. 2023

A&A

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We present photometric and spectroscopic data on three extragalactic luminous red novae (LRNe): AT 2018bwo, AT 2021afy, and AT 2021blu. AT 2018bwo was discovered in NGC 45 (at about 6.8 Mpc) a few weeks after the outburst onset. During the monitoring period, the transient reached a peak luminosity of 1040 erg s−1. AT 2021afy, hosted by UGC 10043 (∼49.2 Mpc), showed a double-peaked light curve, with the two peaks reaching a similar luminosity of 2.1(±0.6)×1041 erg s−1. Finally, for AT 2021blu in UGC 5829 (∼8.6 Mpc), the pre-outburst phase was well-monitored by several photometric surveys, and the object showed a slow luminosity rise before the outburst. The light curve of AT 2021blu was sampled with an unprecedented cadence until the object disappeared behind the Sun, and it was then recovered at late phases. The light curve of LRN AT 2021blu shows a double peak, with a prominent early maximum reaching a luminosity of 6.5 × 1040 erg s−1, which is half of that of AT 2021afy. The spectra of AT 2021afy and AT 2021blu display the expected evolution for LRNe: a blue continuum dominated by prominent Balmer lines in emission during the first peak, and a redder continuum consistent with that of a K-type star with narrow absorption metal lines during the second, broad maximum. The spectra of AT 2018bwo are markedly different, with a very red continuum dominated by broad molecular features in absorption. As these spectra closely resemble those of LRNe after the second peak, AT 2018bwo was probably discovered at the very late evolutionary stages. This would explain its fast evolution and the spectral properties compatible with that of an M-type star. From the analysis of deep frames of the LRN sites years before the outburst, and considerations of the light curves, the quiescent progenitor systems of the three LRNe were likely massive, with primaries ranging from about 13 M⊙ for AT 2018bwo, to 14−1+4 M⊙ for AT 2021blu, and over 40 M⊙ for AT 2021afy.

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Section: Introductionmentioning

confidence: 99%

Forbidden hugs in pandemic times

Pastorello

Valerin

Fraser

et al. 2023

A&A

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“…ILOTs (or gap transients) form a heterogeneous group with diverse time scales, luminosities, and shapes of lightcurves (a partial list of papers include, e.g., Banerjee et al [5], Blagorodnova et al [6], Boian, & Groh [7], Bond et al [8], Cai et al [9,10,11], Jencson et al [4], Kami ński et al [12], Karambelkar et al [13], Kasliwal [14,15], Mason et al [16], Mould et al [17], Ofek et al [18], Pastorello et al [19][20][21][22], Rau et al [23], Stritzinger et al [24], Tylenda et al [25][26][27], and Wadhwa et al [28]).…”

Section: Adopt the Theoretical Definition Of Intermediate Luminosity ...mentioning

confidence: 99%

More Luminous Red Novae That Require Jets

Soker

2024

Galaxies

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In this paper, I study two intermediate luminosity optical transients (ILOTs), classified as luminous red novae (LRNe), and argue that their modeling with a common envelope evolution (CEE) without jets encounters challenges. LRNe are ILOTs powered by violent binary interaction. Although in the literature it is popular to assume a CEE is the cause of LRNe, I here repeat an old claim that many LRNe are powered by grazing envelope evolution (GEE) events; the GEE might end in a CEE or a detached binary system. I find that the LRN AT 2021biy might have continued to experience mass ejection episodes after its eruption and, therefore, might not have suffered a full CEE during the outburst. This adds to an earlier finding that a jetless model does not account for some of its properties. I find that a suggested jetless CEE model for the LRN AT 2019zhd does not reproduce its photosphere radius evolution. These results that challenge jetless models of two LRNe strengthen a previous claim that jets play major roles in powering ILOTs and shaping their ejecta and that, in many LRNe, the more compact companion launches the jets during a GEE.

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“…Since the discovery of V1309 Sco (Tylenda et al 2011), a luminous red nova (LRN) and a confirmed binary merger, many more new LRNe have been discovered (Kurtenkov et al 2015;Blagorodnova et al 2017Blagorodnova et al ,2021Cai et al 2019Cai et al , 2022aCai et al , 2022bPastorello et al 2019Pastorello et al , 2021aPastorello et al , 2021b, to name a few. It is argued that, at least for some of the LRNe, the progenitors are binary stars that have undergone common envelope evolution (CEE; Ivanova et al 2013a), one of the most mysterious events in binary evolution.…”

Section: Introductionmentioning

confidence: 99%

Bridging the Gap between Luminous Red Novae and Common Envelope Evolution: The Role of Recombination Energy and Radiation Force

Chen 陈,

Ivanova

2024

ApJL

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Luminous red novae and their connection to common envelope evolution (CEE) remain elusive in astrophysics. Here, we present a radiation hydrodynamic model capable of simulating the light curves of material ejected during a CEE. For the first time, the radiation hydrodynamic model incorporates complete recombination physics for hydrogen and helium. The radiation hydrodynamic equations are solved with Guangqi. With time-independent ejecta simulations, we show that the peaks in the light curves are attributed to radiation-dominated ejecta, while the extended plateaus are produced by matter-dominated ejecta. To showcase our model’s capability, we fit the light curve of AT 2019zhd. The central mass object of 6 M ⊙ is assumed based on observations and scaling relations. Our model demonstrates that the ejecta mass of AT 2019zhd falls within the range of 0.04–0.1 M ⊙. Additionally, we demonstrate that recombination energy and radiation force acceleration significantly impact the light curves, whereas dust formation has a limited effect during the peak and plateau phases.

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Gap Transients Interacting with Circumstellar Medium

Cited by 9 publications

References 171 publications

Forbidden hugs in pandemic times

Forbidden hugs in pandemic times

More Luminous Red Novae That Require Jets

Bridging the Gap between Luminous Red Novae and Common Envelope Evolution: The Role of Recombination Energy and Radiation Force

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