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Title: Strong near-infrared carbon in the Type Ia supernova iPTF13ebh

Journal Article · · Astronomy and Astrophysics
 [1];  [2];  [1];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10];  [11];  [12];  [13];  [14];  [15];  [16];  [6];  [17];  [18] more »;  [19];  [6];  [20];  [21];  [3];  [2];  [6];  [13];  [7];  [15];  [13];  [2];  [22];  [2];  [20];  [23];  [24];  [6];  [25];  [21];  [6];  [6];  [26];  [2];  [2];  [27];  [6];  [19];  [14];  [28];  [19];  [26];  [29];  [21] « less
  1. Aarhus Univ., Aarhus (Denmark); Carnegie Observatories, Casilla (Chile)
  2. Carnegie Observatories, Pasadena, CA (United States)
  3. Florida State Univ., Tallahassee, FL (United States)
  4. Texas Tech Univ., Lubbock, TX (United States)
  5. Univ. of Texas at Austin, Austin, TX (United States); Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  6. Carnegie Observatories, Casilla (Chile)
  7. Aarhus Univ., Aarhus (Denmark)
  8. Millenium Institute of Astrophysics, Santiago (Chile); Univ. de Chile, Santiago (Chile)
  9. Gemini Observatory, Hilo, HI (United States)
  10. Instituto de Astrofisica de La Plata (IALP), La Plata (Argentina); The Univ. of Tokyo, Chiba (Japan)
  11. Bishop's Univ., Sherbrooke, Quebec (Canada)
  12. Aarhus Univ., Aarhus (Denmark); Univ. of Copenhagen, Copenhagen (Denmark)
  13. Stockholm Univ., Stockholm (Sweden)
  14. Indian Institute of Astrophysics, Bangalore (India)
  15. Las Cumbres Observatory Global Telescope Network, Goleta, CA (United States); Univ. of California, Santa Barbara, CA (United States)
  16. Physical Research Lab., Gujarat (India)
  17. Carnegie Observatories, Pasadena, CA (United States); Univ. de Chile, Santiago (Chile)
  18. Univ. of California, Berkeley, CA (United States)
  19. Texas A & M Univ., College Station, TX (United States)
  20. California Institute of Technology, Pasadena, CA (United States)
  21. Weizmann Inst. of Science, Rehovot (Israel)
  22. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  23. European Southern Observatory for Astronomical Research in the Southern Hemisphere (ESO), Munchen (Germany)
  24. Univ. of Arizona, Tucson, AZ (United States)
  25. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berekeley, CA (United States)
  26. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  27. Pontificia Univ. Catolica de Chile (Chile)
  28. Univ. of Southampton, Southampton (United Kingdom)
  29. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
+ Show Author Affiliations

We present near-infrared (NIR) time-series spectroscopy, as well as complementary ultraviolet (UV), optical, and NIR data, of the Type Ia supernova (SN Ia) iPTF13ebh, which was discovered within two days from the estimated time of explosion. The first NIR spectrum was taken merely 2.3 days after explosion and may be the earliest NIR spectrum yet obtained of a SN Ia. The most striking features in the spectrum are several NIR C I lines, and the C Iλ1.0693 μm line is the strongest ever observed in a SN Ia. Interestingly, no strong optical C II counterparts were found, even though the optical spectroscopic time series began early and is densely cadenced. Except at the very early epochs, within a few days from the time of explosion, we show that the strong NIR C I compared to the weaker optical C II appears to be general in SNe Ia. iPTF13ebh is a fast decliner with Δm15(B) = 1.79 ± 0.01, and its absolute magnitude obeys the linear part of the width-luminosity relation. It is therefore categorized as a “transitional” event, on the fast-declining end of normal SNe Ia as opposed to subluminous/91bg-like objects. iPTF13ebh shows NIR spectroscopic properties that are distinct from both the normal and subluminous/91bg-like classes, bridging the observed characteristics of the two classes. These NIR observations suggest that composition and density of the inner core are similar to that of 91bg-like events, and that it has a deep-reaching carbon burning layer that is not observed in more slowly declining SNe Ia. Furthermore, there is also a substantial difference between the explosion times inferred from the early-time light curve and the velocity evolution of the Si II λ0.6355 μm line, implying a long dark phase of ~4 days.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1234441
Report Number(s):
LA-UR-14-28739; PII: aa25297-14
Journal Information:
Astronomy and Astrophysics, Vol. 578; ISSN 0004-6361
Publisher:
EDP SciencesCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 58 works
Citation information provided by
Web of Science

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Discovery and progenitor constraints on the Type Ia supernova 2013gy journal July 2019
Evidence for a Chandrasekhar-mass explosion in the Ca-strong 1991bg-like type Ia supernova 2016hnk journal September 2019
Carnegie Supernova Project-II: Extending the Near-infrared Hubble Diagram for Type Ia Supernovae to z ∼ 0.1 journal November 2018
Carnegie Supernova Project-II: The Near-infrared Spectroscopy Program journal November 2018
R-band light-curve properties of Type Ia supernovae from the (intermediate) Palomar Transient Factory journal December 2018
The nebular spectra of the transitional Type Ia Supernovae 2007on and 2011iv: broad, multiple components indicate aspherical explosion cores journal February 2018
Unraveling the Infrared Transient VVV-WIT-06: The Case for the Origin as a Classical Nova journal November 2018
Delayed Circumstellar Interaction for Type Ia SN 2015cp Revealed by an HST Ultraviolet Imaging Survey journal January 2019
Spectral Sequences of Type Ia Supernovae. II. Carbon as a Diagnostic Tool for Explosion Mechanisms journal February 2019
Red and Reddened: Ultraviolet through Near-infrared Observations of Type Ia Supernova 2017erp journal June 2019
Double-detonation Models for Type Ia Supernovae: Trigger of Detonation in Companion White Dwarfs and Signatures of Companions’ Stripped-off Materials journal November 2019
Carnegie Supernova Project-II: Using Near-infrared Spectroscopy to Determine the Location of the Outer 56 Ni in Type Ia Supernovae journal April 2019
Nebular H α Limits for Fast Declining SNe Ia journal May 2019
THE SILICON AND CALCIUM HIGH-VELOCITY FEATURES IN TYPE Ia SUPERNOVAE FROM EARLY TO MAXIMUM PHASES journal September 2015
Surface Radioactivity or Interactions? Multiple Origins of Early-excess Type Ia Supernovae and Associated Subclasses journal October 2018
Red versus Blue: Early Observations of Thermonuclear Supernovae Reveal Two Distinct Populations? journal September 2018
Carnegie Supernova Project-II: Extending the Near-Infrared Hubble Diagram for Type Ia Supernovae to $z\sim0.1$ text January 2018
Carnegie Supernova Project-II: Using Near-Infrared Spectroscopy to determine the location of the outer $^{56}$Ni in Type Ia Supernovae text January 2019

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79 ASTRONOMY AND ASTROPHYSICS
infrared: general
supernovae: general
supernovae: individual: iPTF13ebh