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Red and Reddened: Ultraviolet through Near-infrared Observations of Type Ia Supernova 2017erp

Journal Article · · The Astrophysical Journal (Online)
 [1];  [2];  [3];  [4];  [5];  [6];  [3];  [3];  [7];  [8];  [9];  [10];  [11];  [8];  [12];  [13];  [13];  [14];  [15];  [13] more »;  [4];  [16];  [17];  [18];  [6] « less
  1. Texas A & M Univ., College Station, TX (United States). George P. and Cynthia Woods Mitchell Inst. for Fundamental Physics & Astronomy; DOE/OSTI
  2. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  3. Rutgers Univ., Piscataway, NJ (United States)
  4. Univ. of Arizona, Tucson, AZ (United States)
  5. Texas A & M Univ., College Station, TX (United States)
  6. Tsinghua Univ., Beijing (China)
  7. ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO) (Australia); Swinburne Univ. of Technology, Melbourne, Victoria (Australia)
  8. Observatories of the Carnegie Inst. for Science, Pasadena, CA (United States)
  9. Texas A & M Univ., College Station, TX (United States). George P. and Cynthia Woods Mitchell Inst. for Fundamental Physics & Astronomy; Chinese Academy of Sciences, Nanjing, Jiangshu (China)
  10. Tel Aviv Univ., Ramat Aviv (Israel)
  11. Australian National Univ., Weston, Creek, ACT (Australia)
  12. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  13. Las Cumbres Observatory, Goleta, CA (United States); Univ. of California, Santa Barbara, CA (United States)
  14. Florida State Univ., Tallahassee, FL (United States)
  15. Univ. of Texas, Austin, TX (United States)
  16. Uzbekistan Academy of Sciences, Uzbekistan, Tashkent (Uzbekistan). Ulugh Beg Astronomical Inst.
  17. ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO) (Australia); Australian National Univ., Weston, Creek, ACT (Australia). Research School of Astronomy and Astrophysics, Mount Stromlo Observatory; Univ. of New South Wales, Canberra, ACT (Australia). Australian Defence Force Academy
  18. Univ. of California, Davis, CA (United States)
+ Show Author Affiliations
We present space-based ultraviolet/optical photometry and spectroscopy with the Swift Ultra-Violet/Optical Telescope and Hubble Space Telescope (HST), respectively, along with ground-based optical photometry and spectroscopy and near-infrared spectroscopy of supernova SN 2017erp. The optical light curves and spectra are consistent with a normal SN Ia. Compared to previous photometric samples in the near-ultraviolet (NUV), SN 2017erp has UV colors that are redder than NUV-blue SNe Ia corrected to similar optical colors. The chromatic difference between SNe 2011fe and 2017erp is dominated by the intrinsic differences in the UV rather than the expected dust reddening. This chromatic difference is similar to the SALT2 color law, derived from rest-frame ultraviolet photometry of higher redshift SNe Ia. Differentiating between intrinsic UV diversity and dust reddening can have important consequences for determining cosmological distances with rest-frame ultraviolet photometry. This ultraviolet spectroscopic series is the first from HST of a normal, albeit reddened, NUV-red SN Ia and is important for analyzing SNe Ia with intrinsically redder NUV colors. We show model comparisons suggesting that metallicity could be the physical difference between NUV-blue and NUV-red SNe Ia, with emission peaks from reverse fluorescence near 3000 Å implying a factor of ~10 higher metallicity in the upper layers of SN 2017erp compared to SN 2011fe. Metallicity estimates are very model dependent, however, and there are multiple effects in the UV. Further models and UV spectra of SNe Ia are needed to explore the diversity of SNe Ia, which show seemingly independent differences in the near-UV peaks and mid-UV flux levels.
Research Organization:
Rutgers Univ., Piscataway, NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF); Chinese Academy of Sciences; National Aeronautics and Space Administration (NASA)
Grant/Contract Number:
SC0011636
OSTI ID:
1611642
Journal Information:
The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 2 Vol. 877; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
Astronomy &amp; Astrophysics
dust
extinction
supernovae: general
supernovae: individual (SN2017erp
SN2011fe
SN2011by)