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

Research output: Contribution to journalArticle

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 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.

Details

Authors
  • Thomas Finzell
  • Laura Chomiuk
  • Brian D. Metzger
  • Frederick M. Walter
  • Justin D. Linford
  • Koji Mukai
  • Thomas Nelson
  • Jennifer H.S. Weston
  • Yong Zheng
  • Jennifer L. Sokoloski
  • Amy Mioduszewski
  • Michael P. Rupen
  • Subo Dong
  • Sumner Starrfield
  • C. C. Cheung
  • Charles E. Woodward
  • Gregory B. Taylor
  • Terry Bohlsen
  • Christian Buil
  • Jose Prieto
  • R. Mark Wagner
  • I. A. Bond
  • T. Sumi
  • D. P. Bennett
  • F. Abe
  • N. Koshimoto
  • D. Suzuki
  • P. J. Tristram
  • Grant W. Christie
  • Tim Natusch
  • Jennie McCormick
  • Jennifer Yee
  • Andy Gould
Organisations
External organisations
  • Michigan State University
  • Columbia University
  • Stony Brook University
  • George Washington University
  • University of Maryland, Baltimore
  • University of Minnesota system
  • Green Bank Observatory
  • National Radio Astronomy Observatory Socorro
  • Dominion Radio Astrophysical Observatory
  • Peking University
  • Arizona State University
  • Naval Research Laboratory
  • University of New Mexico
  • Mirranook Observatory
  • Castanet Tolosan Observatory
  • University of Arizona
  • Ohio State University
  • Massey University
  • Osaka University
  • Nagoya University
  • Mt. John University Observatory
  • Auckland Observatory
  • Centre for Backyard Astrophysics
  • Harvard–Smithsonian Center for Astrophysics
  • NASA Goddard Space Flight Center
  • Diego Portales University
  • Millennium Institute of Astrophysics
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Astronomy, Astrophysics and Cosmology

Keywords

  • gamma rays: stars, novae, cataclysmic variables, radio continuum: stars, stars: individual (V1324 Sco)
Original languageEnglish
Article number108
JournalAstrophysical Journal
Volume852
Issue number2
StatePublished - 2018 Jan 10
Peer-reviewedYes