천문학회보 (The Bulletin of The Korean Astronomical Society)

한국천문학회 (The Korean Astronomical Society)
권호 표지

Observational Feature of Ejecta-Companion Interaction of A Type Ia SN 2021hpr Via The Very Early Light Curve

  • Lim, Gu (SNU Astronomy Research Center, Seoul National University) ;
  • Im, Myungshin (SNU Astronomy Research Center, Seoul National University) ;
  • Paek, Gregory S.H (SNU Astronomy Research Center, Seoul National University) ;
  • Yoon, Sung-Chul (SNU Astronomy Research Center, Seoul National University) ;
  • Choi, Changsu (SNU Astronomy Research Center, Seoul National University) ;
  • Kim, Sophia (SNU Astronomy Research Center, Seoul National University) ;
  • Seo, Jinguk (SNU Astronomy Research Center, Seoul National University) ;
  • Kang, Wonseok (National Youth Space Center) ;
  • Kim, Taewoo (National Youth Space Center) ;
  • Sung, Hyun-Il (Korea Astronomy and Space Science Institute) ;
  • Kim, Yonggi (Chungbuk National University Observatory, Chungbuk National University) ;
  • Yoon, Joh-Na (Chungbuk National University Observatory, Chungbuk National University)
  • 발행 : 2021.10.13
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초록

The progenitor of Type Ia supernovae is largely expected as a close binary system of a carbon/oxygen white dwarf (WD) primary and its secondary non-degenerate (single degenerate; SD) or degenerate companion (double degenerate; DD). Here we present a high-cadence monitoring observation of SN 2021hpr in a spiral galaxy, NGC 3147. SN 2021hpr shows typical characteristics as a normal type Ia supernova from its photometric (Δm15(B)=1.01±0.03, dust free MB,max=-19.45±0.02) and spectroscopic data. To investigate its progenitor system, we fit the early part of BVRI-band light curve simultaneously with a combined version of ejecta-companion and simple power-law model. As a result, we found a significant feature of an early excess possibly from a 7.63±0.52R⊙-sized companion at the optimal viewing angle while the fit is not successful at the common viewing angle. No possible red sources brighter than F555W=-7.01 AB mag is detected at the SN location in Hubble Space Telescope (HST) pre-explosion images, excluding massive stars with initial mass of >16M⊙ as companions. We suggest the progenitor system of SN 2021hpr can be a fairly large companion such as a main sequence, a low mass subgiant, and a helium giant star. In addition, a possibility of the ejecta-Disk Originated Matter (DOM) interaction for the DD scenario considering linearly-rising early flux still remains.

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