Hard x-rays from supernova 1987A: results of MIR-KVANT and GRANAT in 1987-1990 and expectations

Sunyaev, R.; Гребенев, С. А.; Kaniovsky, A. S.; Efremov, V. V.; Kuznetsov, A.; Pavlinsky, M.; Yamburenko, N.; Englhauser, J.; Doebereiner, S.; Pietsch, W.; Reppin, C.; Truemper, J.; Kendziorra, E.; Maisack, M.; Mony, B.; Staubert, R.

doi:10.1063/1.40938

Cited by 4 publications

(3 citation statements)

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“…Similar conclusions were obtained from the observations performed from the MIR-KVANT observatory 'ROENTGEN' (Sunyaev et al, 1987(Sunyaev et al, , 1990a(Sunyaev et al, , 1991 and Ginga (Dotani et al, 1987). produced by fluorescence of some of these photons (Sunyaev et al, 1990b(Sunyaev et al, , 1991.…”

Section: Core Collapse Supernovaesupporting

confidence: 85%

“…produced by fluorescence of some of these photons (Sunyaev et al, 1990b(Sunyaev et al, , 1991. Sunyaev et al (1990bSunyaev et al ( , 1991.…”

Section: Core Collapse Supernovaementioning

confidence: 99%

“…Figure 5: Spectra of SN 1987A from the data of observations with the ROENTGEN observatory at the MIR-KVANT orbital station at 7 different epochs (days after the explosion are indicated for each date). Taken fromSunyaev et al (1990bSunyaev et al ( , 1991.…”

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confidence: 99%

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Synthesis of radioactive elements in novae and supernovae and their use as a diagnostic tool

Isern,

Hernanz,

Bravo

et al. 2021

Preprint

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Novae and supernovae play a key role in many fields of Astrophysics and Cosmology. Despite their importance, an accurate description of which objects explode and why and how they explode is still lacking. One of the main characteristics of such explosions is that they are the main suppliers of newly synthesized chemical elements in the Galaxy. Since some of these isotopes are radioactive, it is possible to use the corresponding gamma-rays as a diagnostic tool of the explosion thanks to their independence on the thermal state of the debris. The drawback is the poor sensitivity of detectors in the MeV energy domain. As a consequence, the radioactive lines have only been detected in one core collapse supernova (SN 1987A), one Type Ia supernova (SN 2014J), and one supernova remnant (Cas A). Nevertheless these observations have provided and are providing important information about the explosion mechanisms. Unfortunately, novae are still eluding detection. These results emphasize the necessity to place as soon as possible a new instrument in orbit with enough sensitivity to notice-

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Section: Core Collapse Supernovaesupporting

confidence: 85%

“…produced by fluorescence of some of these photons (Sunyaev et al, 1990b(Sunyaev et al, , 1991. Sunyaev et al (1990bSunyaev et al ( , 1991.…”

Section: Core Collapse Supernovaementioning

confidence: 99%

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Synthesis of radioactive elements in novae and supernovae and their use as a diagnostic tool

Isern,

Hernanz,

Bravo

et al. 2021

Preprint

Self Cite

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The Light Curve of Sn 1987a Revisited: Constraining Production Masses of Radioactive Nuclides

Seitenzahl

Timmes

Magkotsios

2014

ApJ

101

105

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We revisit the evidence for the contribution of the long-lived radioactive nuclides 44 Ti, 55 Fe, 56 Co, 57 Co, and 60 Co to the UVOIR light curve of SN 1987A. We show that the V-band luminosity constitutes a roughly constant fraction of the bolometric luminosity between 900 and 1900 days, and we obtain an approximate bolometric light curve out to 4334 days by scaling the late time V-band data by a constant factor where no bolometric light curve data is available. Considering the five most relevant decay chains starting at 44 Ti, 55 Co, 56 Ni, 57 Ni, and 60 Co, we perform a least squares fit to the constructed composite bolometric light curve. For the nickel isotopes, we obtain best fit values of M( 56 Ni) = (7.1 ± 0.3) × 10 −2 M ⊙ and M( 57 Ni) = (4.1 ± 1.8) × 10 −3 M ⊙ . Our best fit 44 Ti mass is M( 44 Ti) = (0.55 ± 0.17)× 10 −4 M ⊙ , which is in disagreement with the much higher (3.1 ± 0.8) × 10 −4 M ⊙ recently derived from INTEGRAL observations. The associated uncertainties far exceed the best fit values for 55 Co and 60 Co and, as a result, we only give upper limits on the production masses of M( 55 Co) < 7.2 × 10 −3 M ⊙ and M( 60 Co) < 1.7 × 10 −4 M ⊙ . Furthermore, we find that the leptonic channels in the decay of 57 Co (internal conversion and Auger electrons) are a significant contribution and constitute up to 15.5% of the total luminosity. Consideration of the kinetic energy of these electrons is essential in lowering our best fit nickel isotope production ratio to [ 57 Ni/ 56 Ni] = 2.5 ± 1.1, which is still somewhat high but is in agreement with gamma-ray observations and model predictions.

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A new versatile code for gamma-ray Monte-Carlo radiative transfer

Leung

2023

Monthly Notices of the Royal Astronomical Society

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Ongoing MeV telescopes such as INTEGRAL/SPI and Fermi/GBM, and proposed telescopes including the recently accepted COSI and the e-ASTROGAM and AMEGO missions, provide another window in understanding transients. Their signals contain information about the stellar explosion mechanisms and their corresponding nucleosynthesis of short-lived radioactive isotopes. This raises the need of a radiative transfer code which may efficiently explore different types of astrophysical γ-ray sources and their dependence on model parameters and input physics. In view of this, we present our new Monte-Carlo Radiative Transfer code in Python. The code synthesizes the γ-ray spectra and light curves suitable for modeling supernova ejecta, including C+O novae, O+Ne novae, Type Ia and core-collapse supernovae. We test the code extensively for reproducing results consistent with analytic models. We also compare our results with similar models in the literature and discuss how our code depends on selected input physics and setting.

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Hard x-rays from supernova 1987A: results of MIR-KVANT and GRANAT in 1987-1990 and expectations

Cited by 4 publications

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Synthesis of radioactive elements in novae and supernovae and their use as a diagnostic tool

Synthesis of radioactive elements in novae and supernovae and their use as a diagnostic tool

The Light Curve of Sn 1987a Revisited: Constraining Production Masses of Radioactive Nuclides

A new versatile code for gamma-ray Monte-Carlo radiative transfer

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