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A Detailed Observational Analysis of V1324 Sco, the Most Gamma-Ray-luminous Classical Nova to Date

Finzell, Thomas; Chomiuk, Laura; Metzger, Brian D.; Walter, Frederick M.; Linford, Justin D.; Mukai, Koji; Nelson, Thomas; Weston, Jennifer H.S.; Zheng, Yong and Sokoloski, Jennifer L., et al. (2018) In Astrophysical Journal 852(2).
Abstract

It has recently been discovered that some, if not all, classical novae emit GeV gamma-rays during outburst, but the mechanisms involved in the production ofgamma-rays are still not well understood. We present here a comprehensive multiwavelength data set - from radio to X-rays - for the most gamma-ray-luminous classical nova to date, V1324 Sco. Using this data set, we show that V1324 Sco is a canonical dusty Fe ii-type nova, with a maximum ejecta velocity of 2600 km s-1 and an ejecta mass of a few × 10-5 M. There is also evidence for complex shock interactions, including a double-peaked radio light curve which shows high brightness temperatures at early times. To explore why V1324 Sco was so gamma-ray... (More)

It has recently been discovered that some, if not all, classical novae emit GeV gamma-rays during outburst, but the mechanisms involved in the production ofgamma-rays are still not well understood. We present here a comprehensive multiwavelength data set - from radio to X-rays - for the most gamma-ray-luminous classical nova to date, V1324 Sco. Using this data set, we show that V1324 Sco is a canonical dusty Fe ii-type nova, with a maximum ejecta velocity of 2600 km s-1 and an ejecta mass of a few × 10-5 M. There is also evidence for complex shock interactions, including a double-peaked radio light curve which shows high brightness temperatures at early times. To explore why V1324 Sco was so gamma-ray luminous, we present a model of the nova ejecta featuring strong internal shocks and find that higher gamma-ray luminosities result from higher ejecta velocities and/or mass-loss rates. Comparison of V1324 Sco with other gamma-ray-detected novae does not show clear signatures of either, and we conclude that a larger sample of similarly well-observed novae is needed to understand the origin and variation of gamma-rays in novae.

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@article{f011774c-bb5c-4769-ac49-c9e043554078,
  abstract     = {<p>It has recently been discovered that some, if not all, classical novae emit GeV gamma-rays during outburst, but the mechanisms involved in the production ofgamma-rays are still not well understood. We present here a comprehensive multiwavelength data set - from radio to X-rays - for the most gamma-ray-luminous classical nova to date, V1324 Sco. Using this data set, we show that V1324 Sco is a canonical dusty Fe ii-type nova, with a maximum ejecta velocity of 2600 km s<sup>-1</sup> and an ejecta mass of a few × 10<sup>-5</sup> M<sub>⊙</sub>. There is also evidence for complex shock interactions, including a double-peaked radio light curve which shows high brightness temperatures at early times. To explore why V1324 Sco was so gamma-ray luminous, we present a model of the nova ejecta featuring strong internal shocks and find that higher gamma-ray luminosities result from higher ejecta velocities and/or mass-loss rates. Comparison of V1324 Sco with other gamma-ray-detected novae does not show clear signatures of either, and we conclude that a larger sample of similarly well-observed novae is needed to understand the origin and variation of gamma-rays in novae.</p>},
  articleno    = {108},
  author       = {Finzell, Thomas and Chomiuk, Laura and Metzger, Brian D. and Walter, Frederick M. and Linford, Justin D. and Mukai, Koji and Nelson, Thomas and Weston, Jennifer H.S. and Zheng, Yong and Sokoloski, Jennifer L. and Mioduszewski, Amy and Rupen, Michael P. and Dong, Subo and Starrfield, Sumner and Cheung, C. C. and Woodward, Charles E. and Taylor, Gregory B. and Bohlsen, Terry and Buil, Christian and Prieto, Jose and Wagner, R. Mark and Bensby, Thomas and Bond, I. A. and Sumi, T. and Bennett, D. P. and Abe, F. and Koshimoto, N. and Suzuki, D. and Tristram, P. J. and Christie, Grant W. and Natusch, Tim and McCormick, Jennie and Yee, Jennifer and Gould, Andy},
  issn         = {0004-637X},
  keyword      = {gamma rays: stars,novae, cataclysmic variables,radio continuum: stars,stars: individual (V1324 Sco)},
  language     = {eng},
  month        = {01},
  number       = {2},
  publisher    = {American Astronomical Society},
  series       = {Astrophysical Journal},
  title        = {A Detailed Observational Analysis of V1324 Sco, the Most Gamma-Ray-luminous Classical Nova to Date},
  url          = {http://dx.doi.org/10.3847/1538-4357/aaa12a},
  volume       = {852},
  year         = {2018},
}