V5852 Sgr: an unusual nova possibly associated with the Sagittarius stream

Aydi, E.; Mróz, P.; Whitelock, P. A.; Mohamed, S.; Wyrzykowski, Ł.; Udalski, A.; Vaïsänen, P.; Nagayama, Takahiro; Dominik, M.; Scholz, A.; Onozato, Hiroki; Williams, Robert E.; Hodgkin, S. T.; Nishiyama, Shogo; Yamagishi, Masao; Smith, A. M. S.; Ryu, Tsuguru; Iwamatsu, Atsushi; Kawamata, I.

doi:10.1093/mnras/stw1396

Cited by 3 publications

(1 citation statement)

References 37 publications

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“…Classical novae have also not been studied rigorously in dSphs. Only a couple classical novae have been discovered in dSphs, such as a possible novae in the M32 dSph (Darnley et al 2004), and the unusual nova V5852 Sgr, which may be the first nova to be discovered in a dSph (Aydi et al 2016). The 𝜈-process has not been addressed in great detail in dSphs.…”

Section: Gcr/classical Novae/𝜈-processmentioning

confidence: 99%

Galactic Isotopic Decomposition for the Sculptor Dwarf Spheroidal Galaxy

Pandey¹,

West²

2021

Preprint

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Stellar evolution models require an initial isotopic abundance set as input, but these abundances have not been thoroughly established outside of our sun. Nucleosynthesis studies require reliable isotopic abundances which are challenging to infer from elemental observations and are galaxy specific. Despite the challenges, accurate GCE models for dSphs can provide significant insight on the galactic hierarchy. We present an isotopic history model for the Sculptor dSph galaxy based on astrophysical processes, which is a complementary approach to GCE models. We estimate the isotopic composition of Sculptor's late stage evolution using OMEGA, and we use BBN as the other boundary condition. Each astrophysical process was assigned a parametric function with free parameters according to the underlying physics that dictate their average chemical evolution. The isotopic yields were summed into elemental yields and fit to observational Sculptor abundance data to fix the free parameters. This procedure gives an average isotopic history of Sculptor for massive star, Type 1a SNe, main s-process peak, and r-process contributions, which can be compared with the chemical history of the MW. We find that Type 1a SNe contribute approximately 86 per cent to the late stage evolution Fe abundance, which is greater than typical MW solar values of approximately 70 per cent, and in agreement with other dSph chemical evolution studies. The model also finds that NSMs only contribute approximately 30 per cent to the late stage evolution Eu abundance, further suggesting that CCSNe are the more dominant r-process progenitor in dSphs.

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Section: Gcr/classical Novae/𝜈-processmentioning

confidence: 99%

Galactic Isotopic Decomposition for the Sculptor Dwarf Spheroidal Galaxy

Pandey¹,

West²

2021

Preprint

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Search for gamma-ray emission from Galactic novae with the Fermi -LAT

Franckowiak

Jean

Wood

et al. 2018

A&A

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Context. A number of novae have been found to emit high-energy gamma rays (> 100 MeV). However, the origin of this emission is not yet understood. We report on the search for gamma-ray emission from 75 optically-detected Galactic novae in the first 7.4 years of operation of the Fermi Large Area Telescope using the Pass 8 data set. Aims. We compile an optical nova catalog including light curves from various resources and estimate the optical peak time and optical peak magnitude in order to search for gamma-ray emission to test if all novae are gamma-ray emitters. Methods. We repeat the analysis of the six novae previously identified as gamma-ray sources and develop a unified analysis strategy which we then apply to all novae in our catalog. We search for emission in a 15-day time window in two-day steps ranging from 20 days before to 20 days after the optical peak time. We perform a population study with Monte Carlo simulations to set constraints on the properties of the gamma-ray emission of novae. Results. Two new novae candidates have been found at ∼ 2σ global significance. Although these two novae candidates were not detected at a significant level individually, taking them together with the other non-detected novae, we found a sub-threshold nova population with a cumulative 3σ significance. We report the measured gamma-ray flux for detected sources and flux upper limits for novae without significant detection. Our results can be reproduced by several gamma-ray emissivity models (e.g. a power-law distribution with a slope of 2), while a constant emissivity model (i.e. assuming novae are standard candles) can be rejected.

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Search for sub-TeV Neutrino Emission from Novae with IceCube-DeepCore

Abbasi¹,

Ackermann²,

Adams³

et al. 2023

ApJ

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The understanding of novae, the thermonuclear eruptions on the surfaces of white dwarf stars in binaries, has recently undergone a major paradigm shift. Though the bolometric luminosity of novae was long thought to arise directly from photons supplied by the thermonuclear runaway, recent gigaelectronvolt (GeV) gamma-ray observations have supported the notion that a significant portion of the luminosity could come from radiative shocks. More recently, observations of novae have lent evidence that these shocks are acceleration sites for hadrons for at least some types of novae. In this scenario, a flux of neutrinos may accompany the observed gamma rays. As the gamma rays from most novae have only been observed up to a few GeV, novae have previously not been considered as targets for neutrino telescopes, which are most sensitive at and above teraelectronvolt (TeV) energies. Here, we present the first search for neutrinos from novae with energies between a few GeV and 10 TeV using IceCube-DeepCore, a densely instrumented region of the IceCube Neutrino Observatory with a reduced energy threshold. We search both for a correlation between gamma-ray and neutrino emission as well as between optical and neutrino emission from novae. We find no evidence for neutrino emission from the novae considered in this analysis and set upper limits for all gamma-ray detected novae.

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V5852 Sgr: an unusual nova possibly associated with the Sagittarius stream

Cited by 3 publications

References 37 publications

Galactic Isotopic Decomposition for the Sculptor Dwarf Spheroidal Galaxy

Galactic Isotopic Decomposition for the Sculptor Dwarf Spheroidal Galaxy

Search for gamma-ray emission from Galactic novae with the Fermi -LAT

Search for sub-TeV Neutrino Emission from Novae with IceCube-DeepCore

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