Discovery of a Rapid, Luminous Nova in NGC 300 by the KMTNet Supernova Program

作者：Antoniadis John; Moon Dae Sik; Ni Yuan Qi; Kim Dong Jin; Lee Yongseok; Neilson Hilding

来源：Astrophysical Journal, 2017, 844(2): 160.

DOI：10.3847/1538-4357/aa706b

• galaxies: individual (NGC 300)
• novae, cataclysmic variables
• surveys
• techniques: photometric

We present the discovery of a rapidly evolving transient by the Korean Microlensing Telescope Network Supernova Program (KSP). KSP is a novel high-cadence supernova survey that offers deep (similar to 21.5 mag in BV I bands), nearly continuous wide-field monitoring for the discovery of early and/ or fast optical transients. KSP-OT-201509a, reported here, was discovered on 2015 September 27 during the KSP commissioning run in the direction of the nearby galaxy NGC. 300, and stayed above detection limit for similar to 22 days. We use our BV I light curves to constrain the ascent rate, -3.7(7) mag day(-1) in V, decay timescale, t(2)(V) = 1.7(6) 2 days, and peak absolute magnitude, -9.65 <= MV <= -9.25 mag. We also find evidence for a short-lived pre-maximum halt in all bands. The peak luminosity and light-curve evolution make KSP-OT-201509a. consistent with a bright, rapidly decaying nova outburst. We discuss constraints on the nature of the progenitor and its environment using archival Hubble Space Telescope (HST)/ACS images and conclude with a broad discussion on the nature of the system.

• 出版日期2017-8-1