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

Abstract

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.

Authors:

Cheung, C. C. ^[1]; Jean, P. ^[2]; Shore, S. N. ^[3]; Stawarz, Ł.  ^[4];

• Search DOE PAGES for author "Stawarz, Ł."
• Search DOE PAGES for ORCID "0000-0001-8294-9479"

Corbet, R. H. D. ^[5]; Knödlseder, J. ^[2]; Starrfield, S. ^[6]; Wood, D. L. ^[7]; Desiante, R.  ^[8];

• Search DOE PAGES for author "Desiante, R."
• Search DOE PAGES for ORCID "0000-0002-5558-6956"

Longo, F. ^[9]; Pivato, G.  ^[10];

• Search DOE PAGES for author "Pivato, G."
• Search DOE PAGES for ORCID "0000-0002-9848-9929"

Wood, K. S. ^[7]

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+ Show Author Affiliations

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:

Wed Jul 27 00:00:00 EDT 2016

Research Org.:

SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Org.:

USDOE

Contributing Org.:

Fermi LAT Collaboration

OSTI Identifier:

1355708

Grant/Contract Number:  

AC02-76SF00515

Resource Type:

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

Publisher:

Institute of Physics (IOP)

Country of Publication:

United States

Language:

English

Subject:

79 ASTRONOMY AND ASTROPHYSICS; gamma-rays: stars; novae; cataclysmic variables; radiation mechanisms: general