Optical and Near-Infrared Photometry of Nova V2362 Cyg: Rebrightening Event and Dust Formation
| Autor: | Shingo Chiyonobu, Masaru Kino, Taichi Kato, Akira Arai, Hiroyuki Maehara, Hiromitsu Takahashi, Kenshi Yanagisawa, Michitoshi Yoshida, Takashi Ohsugi, Kazuhiro Nakajima, Kiichi Okita, Koji S. Kawabata, Osamu Nagae, Takuya Yamashita, Makoto Uemura, Tsunefumi Mizuno, Kozo Sadakane, Yasushi Fukazawa, Hideaki Katagiri, Masahiro Kitagawa, Seiichiro Kiyota, Shuji Sato, Mizuki Isogai |
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| Rok vydání: | 2010 |
| Předmět: |
Physics
Near-infrared spectroscopy FOS: Physical sciences Astronomy and Astrophysics Astrophysics Effective temperature Photometry (optics) Flux (metallurgy) Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Outflow Black-body radiation Ejecta Solar and Stellar Astrophysics (astro-ph.SR) |
| Zdroj: | Publications of the Astronomical Society of Japan. 62:1103-1108 |
| ISSN: | 2053-051X 0004-6264 |
| DOI: | 10.1093/pasj/62.4.1103 |
| Popis: | We present optical and near-infrared (NIR) photometry of a classical nova, V2362 Cyg (= Nova Cygni 2006). V2362 Cyg experienced a peculiar rebrightening with a long duration from 100 to 240 d after the maximum of the nova. Our multicolor observation indicates an emergence of a pseudophotosphere with an effective temperature of 9000 K at the rebrightening maximum. After the rebrightening maximum, the object showed a slow fading homogeneously in all of the used bands for one week. This implies that the fading just after the rebrightening maximum ( less or equal 1 week ) was caused by a slowly shrinking pseudophotosphere. Then, the NIR flux drastically increased, while the optical flux steeply declined. The optical and NIR flux was consistent with blackbody radiation with a temperature of 1500 K during this NIR rising phase. These facts are likely to be explained by dust formation in the nova ejecta. Assuming an optically thin case, we estimate the dust mass of 10^(-8) -- 10^(-10) M_solar, which is less than those in typical dust-forming novae. These results support the senario that a second, long-lasting outflow, which caused the rebrightening, interacted with a fraction of the initial outflow and formed dust grains. 6 pages, 4 figures, 2010, PASJ, 62, 1103--1108, in press |
| Databáze: | OpenAIRE |
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