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Title: Fermi-LAT gamma ray detections of classical novae V1369 centauri 2013 and V5668 Sagittarii 2015

Here, we report the Fermi Large Area Telescope (LAT) detections of high-energy (>100 MeV) γ-ray emission from two recent optically bright classical novae, V1369 Centauri 2013 and V5668 Sagittarii 2015. Furthermore, at early times, Fermi target-of-opportunity observations prompted by their optical discoveries provided enhanced LAT exposure that enabled the detections of γ-ray onsets beginning ~2 days after their first optical peaks. Significant γ-ray emission was found extending to 39–55 days after their initial LAT detections, with systematically fainter and longer-duration emission compared to previous γ-ray-detected classical novae. These novae were distinguished by multiple bright optical peaks that encompassed the time spans of the observed γ-rays. Finally, we discussed the γ-ray light curves and spectra of the two novae are presented along with representative hadronic and leptonic models, and comparisons with other novae detected by the LAT.
 [1] ;  [2] ;  [3] ; ORCiD logo [4] ;  [5] ;  [2] ;  [6] ;  [7] ; ORCiD logo [8] ;  [9] ; ORCiD logo [10] ;  [7]
  1. Naval Research Lab. (NRL), Washington, DC (United States). Space Science Division
  2. French National Center for Scientific Research (CNRS), Paris (France); Univ. of Toulous (France). Galaxies, High Energy Astrophysics and Cosmology (GAHEC)
  3. National Inst. of Nuclear Physics, Pisa (Italy); Univ. of Pisa (Italy). Dept. of Physics
  4. Jagiellonian Univ., Krakow (Poland). Astronomical Observatory
  5. Center for Research and Exploration in Space Science and Technology (CRESST) and NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States)
  6. Arizona State Univ., Tempe, AZ (United States). School of Earth and Space Exploration
  7. Praxis Inc., Alexandria, VA (United States); Naval Research Lab. (NRL), Washington, DC (United States)
  8. Univ. of Udine (Italy); National Inst. of Nuclear Physics, Torino (Italy)
  9. National Inst. of Nuclear Physics, Trieste (Italy); Univ. of Trieste (Italy). Dept. of Physics
  10. National Inst. of Nuclear Physics, Pisa (Italy)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 826; Journal Issue: 2; Journal ID: ISSN 1538-4357
Institute of Physics (IOP)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
Contributing Orgs:
Fermi LAT Collaboration
Country of Publication:
United States
79 ASTRONOMY AND ASTROPHYSICS; gamma-rays: stars; novae; cataclysmic variables; radiation mechanisms: general
OSTI Identifier: