A Comprehensive Light-curve Model of the Very Fast Nova V1674 Herculis
V1674 Her is one of the fastest novae, of which the very early phase is well observed, including optical rise to the peak over 10 mag. We present a full theoretical light-curve model of V1674 Her. Our 1.35 M _⊙ white dwarf (WD) model with the mass accretion rate of 1 × 10 ^−11 M _⊙ yr ^−1 explains o...
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ade231 |
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| author | Mariko Kato Izumi Hachisu Hideyuki Saio |
| author_facet | Mariko Kato Izumi Hachisu Hideyuki Saio |
| author_sort | Mariko Kato |
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| description | V1674 Her is one of the fastest novae, of which the very early phase is well observed, including optical rise to the peak over 10 mag. We present a full theoretical light-curve model of V1674 Her. Our 1.35 M _⊙ white dwarf (WD) model with the mass accretion rate of 1 × 10 ^−11 M _⊙ yr ^−1 explains overall properties including a very fast rise and decay of the optical V light curve. The WD photosphere expands up to 21 R _⊙ , thus a 0.26 M _⊙ companion star orbiting the WD every 3.67 hr is engulfed 2.7 hr after the onset of thermonuclear runaway and appears 5.3 days after that. The duration of X-ray flash is only 0.96 hr. The evolution of the expanding envelope and temporal change of the photospheric radius are very consistent with observed optical and X-ray modulations with the orbital and spin (501 s) periods. We confirm that the decay phase of the nova light curve is well approximated by a sequence of steady-state envelope solutions. Using the time-stretching method of nova light curves, we obtain the V -band distance modulus of ( m − M ) _V = 16.3 ± 0.2 and determine the distance to be d = 8.9 ± 1 kpc for the interstellar extinction of E ( B – V ) = 0.5 ± 0.05. |
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| institution | Kabale University |
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| language | English |
| publishDate | 2025-01-01 |
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| spelling | doaj-art-d651fe04e6c64ab3ba4ead75b4b4cb982025-08-20T03:50:58ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01988111210.3847/1538-4357/ade231A Comprehensive Light-curve Model of the Very Fast Nova V1674 HerculisMariko Kato0https://orcid.org/0000-0002-8522-8033Izumi Hachisu1https://orcid.org/0000-0002-0884-7404Hideyuki Saio2Department of Astronomy, Keio University , Hiyoshi, Kouhoku-ku, Yokohama 223-8521, Japan ; mariko.kato@hc.st.keio.ac.jpDepartment of Earth Science and Astronomy, College of Arts and Sciences, The University of Tokyo , 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, JapanAstronomical Institute, Graduate School of Science, Tohoku University , Sendai 980-8578, JapanV1674 Her is one of the fastest novae, of which the very early phase is well observed, including optical rise to the peak over 10 mag. We present a full theoretical light-curve model of V1674 Her. Our 1.35 M _⊙ white dwarf (WD) model with the mass accretion rate of 1 × 10 ^−11 M _⊙ yr ^−1 explains overall properties including a very fast rise and decay of the optical V light curve. The WD photosphere expands up to 21 R _⊙ , thus a 0.26 M _⊙ companion star orbiting the WD every 3.67 hr is engulfed 2.7 hr after the onset of thermonuclear runaway and appears 5.3 days after that. The duration of X-ray flash is only 0.96 hr. The evolution of the expanding envelope and temporal change of the photospheric radius are very consistent with observed optical and X-ray modulations with the orbital and spin (501 s) periods. We confirm that the decay phase of the nova light curve is well approximated by a sequence of steady-state envelope solutions. Using the time-stretching method of nova light curves, we obtain the V -band distance modulus of ( m − M ) _V = 16.3 ± 0.2 and determine the distance to be d = 8.9 ± 1 kpc for the interstellar extinction of E ( B – V ) = 0.5 ± 0.05.https://doi.org/10.3847/1538-4357/ade231Classical novaeStellar windsX-ray binary stars |
| spellingShingle | Mariko Kato Izumi Hachisu Hideyuki Saio A Comprehensive Light-curve Model of the Very Fast Nova V1674 Herculis The Astrophysical Journal Classical novae Stellar winds X-ray binary stars |
| title | A Comprehensive Light-curve Model of the Very Fast Nova V1674 Herculis |
| title_full | A Comprehensive Light-curve Model of the Very Fast Nova V1674 Herculis |
| title_fullStr | A Comprehensive Light-curve Model of the Very Fast Nova V1674 Herculis |
| title_full_unstemmed | A Comprehensive Light-curve Model of the Very Fast Nova V1674 Herculis |
| title_short | A Comprehensive Light-curve Model of the Very Fast Nova V1674 Herculis |
| title_sort | comprehensive light curve model of the very fast nova v1674 herculis |
| topic | Classical novae Stellar winds X-ray binary stars |
| url | https://doi.org/10.3847/1538-4357/ade231 |
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