Zobrazeno 1 - 10
of 214
pro vyhledávání: '"Izumi Hachisu"'
Autor:
Mariko Kato, Izumi Hachisu
Publikováno v:
The Astrophysical Journal, Vol 973, Iss 2, p 160 (2024)
A helium nova occurs on a white dwarf (WD) accreting hydrogen-deficient matter from a helium star companion. When the mass of a helium envelope on the WD reaches a critical value, unstable helium burning ignites to trigger a nova outburst. A bright s
Externí odkaz:
https://doaj.org/article/7fdd6751ec934da4909c3c51a1831c0c
Publikováno v:
The Astrophysical Journal, Vol 965, Iss 1, p 49 (2024)
The classical nova V339 Del 2013 is characterized by a 1.5 mag dip of the V light curve owing to a dust shell formation, with which soft X-ray emissions coexist. We present a Strömgren y -band light curve, which represents continuum emission, not in
Externí odkaz:
https://doaj.org/article/7eef6325360d4067813958668eab6c1e
Autor:
Izumi Hachisu, Mariko Kato
Publikováno v:
The Astrophysical Journal, Vol 953, Iss 1, p 78 (2023)
YZ Ret is the first X-ray flash detected classical nova, and is also observed in optical, X-ray, and gamma-ray. We propose a comprehensive model that explains the observational properties. The white dwarf mass is determined to be ∼1.33 M _☉ , whi
Externí odkaz:
https://doaj.org/article/d866f033c3904da8a9272066d2a9edfe
Autor:
Mariko Kato, Izumi Hachisu
Publikováno v:
The Astrophysical Journal, Vol 951, Iss 2, p 128 (2023)
CN Cha is a slow symbiotic nova characterized by a 3 yr long optical flat peak followed by a rapid decline. We present theoretical light curves for CN Cha, based on hydrostatic approximation, and estimate the white-dwarf (WD) mass to be ∼0.6 M _☉
Externí odkaz:
https://doaj.org/article/0b9968a6153046ec9ba4ee3bec454ad5
Autor:
Izumi Hachisu, Mariko Kato
We propose a theoretical explanation of absorption/emission line systems in classical novae based on a fully self-consistent nova explosion model. We found that a reverse shock is formed far outside the photosphere ($\gtrsim 10^{13}$ cm) because late
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3d58d8b396eb857d2a7cac0e185b77c2
Publikováno v:
Research Notes of the AAS. 6:258
The pre-maximum evolution of a nova is the last frontier in studying such objects. YZ Reticuli 2020 is the only nova whose X-ray flash was detected. The X-ray flash occurs immediately after the onset of thermonuclear runaway, so its physical properti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0ac435d80e977fc4b74dcb3377b0c047
https://doi.org/10.3847/2515-5172/aca8af
https://doi.org/10.3847/2515-5172/aca8af
Publikováno v:
The Astrophysical Journal Letters. 935:L15
An X-ray flash, expected in a very early phase of a nova outburst, was at last detected with the {\it SRG}/eROSITA in the classical nova YZ Reticuli 2020. The observed flash timescale, luminosity, and blackbody temperature substantially constrain the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::416207b3a077b20ed8bf81ece3c95deb
https://doi.org/10.3847/2041-8213/ac85c1
https://doi.org/10.3847/2041-8213/ac85c1
The classical nova V2491 Cyg was once suggested to be a recurrent nova. We have broadly reproduced the light curve of V2491 Cyg by a nova outburst model on a cold $1.36~M_\odot$ white dwarf (WD), which strongly suggests that V2491 Cyg is a classical
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::97eef08294095b4a6a66b7825acca106
Autor:
Mariko Kato, Izumi Hachisu
We have examined the optical/X-ray light curves of seven well-observed recurrent novae, V745 Sco, M31N 2008-12a, LMC N 1968, U Sco, RS Oph, LMC N 2009a, T Pyx, and one recurrent nova candidate LMC N 2012a. Six novae out of the eight show a simple rel
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::019c06d5e1ff122a3fdcc7b9eeb61688
http://arxiv.org/abs/2007.03387
http://arxiv.org/abs/2007.03387
Autor:
Izumi, HACHISU
Publikováno v:
川口短大紀要 = Journal of Kawaguchi Junior College. 31:27-40
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=jairo_______::8a6c2de65f96674bd15ab2033af5ac0c
http://id.nii.ac.jp/1354/00001117/
http://id.nii.ac.jp/1354/00001117/