V1647 Orionis (IRAS 05436$-$0007): A New Look at McNeil’s Nebula

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  • Devendra Ojha
    1Tata Institute of Fundamental Research, Mumbai (Bombay) - 400 005, India ojha@tifr.res.in
  • Nobuhiko Kusakabe
    2National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588
  • Motohide Tamura
    2National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588
  • Yasushi Nakajima
    2National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588
  • Misato Fukagawa
    2National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588
  • Koji Sugitani
    3Institute of Natural Sciences, Nagoya City University, Mizuho-ku, Nagoya 467-8501
  • Daisuke Baba
    4Department of Astrophysics, Faculty of Sciences, Nagoya University, Chikusa, Nagoya 464-8602
  • Daisuke Kato
    4Department of Astrophysics, Faculty of Sciences, Nagoya University, Chikusa, Nagoya 464-8602
  • Mikio Kurita
    4Department of Astrophysics, Faculty of Sciences, Nagoya University, Chikusa, Nagoya 464-8602
  • Chie Nagashima
    4Department of Astrophysics, Faculty of Sciences, Nagoya University, Chikusa, Nagoya 464-8602
  • Takahiro Nagayama
    4Department of Astrophysics, Faculty of Sciences, Nagoya University, Chikusa, Nagoya 464-8602
  • Tetsuya Nagata
    4Department of Astrophysics, Faculty of Sciences, Nagoya University, Chikusa, Nagoya 464-8602
  • Shuji Sato
    4Department of Astrophysics, Faculty of Sciences, Nagoya University, Chikusa, Nagoya 464-8602

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<jats:title>Abstract</jats:title> <jats:p>We present a study of the newly discovered McNeil’s nebula in Orion using simultaneous observations of the $JHK_{\mathrm{s}}$-bands with the near-infrared (NIR) camera SIRIUS on the IRSF 1.4m telescope. The cometary infrared nebula is clearly seen extending toward both north and south from the NIR source (V1647 Orionis), which illuminates McNeil’s nebula. The compact nebula has an apparent diameter of about $70 {}^{\prime \prime }$. The nebula is blue (bright in $J$) and has a cavity structure with two rims extending toward the north-east and the north-west. The north-east rim is brighter and sharp, while the north-west rim is diffuse. The north-east rim can be traced out to $\sim 40 {{}^{\prime \prime }}$ from the location of the NIR source. In contrast, no cavity structure can be seen toward the south, although the diffuse nebula is extended out to $\sim 20 {{}^{\prime \prime }}$. New NIR photometric data show a significant variation in the magnitudes ($\gt 0.15 \,\mathrm{mag} &gt; 0.15 \,\mathrm{mag}$) of the source of McNeil’s nebula within a period of one week, which is possibly under the phase of eruptive variables, like FUors or EXors.</jats:p>

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