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Title: Absence of Fast-Moving Iron in an Intermediate Type Ia Supernova Between Normal and Super-Chandrasekhar

In this study, we report observations of a peculiar SN Ia iPTF13asv (a.k.a., SN2013cv) from the onset of the explosion to months after its peak. The early-phase spectra of iPTF13asv show an absence of iron absorption, indicating that synthesized iron elements are confined to low-velocity regions of the ejecta, which, in turn, implies a stratified ejecta structure along the line of sight. Our analysis of iPTF13asv's light curves and spectra shows that it is an intermediate case between normal and super-Chandrasekhar events. On the one hand, its light curve shape (B-band $${\rm{\Delta }}{m}_{15}=1.03\pm 0.01$$) and overall spectral features resemble those of normal SNe Ia. On the other hand, its large peak optical and UV luminosity ($${M}_{B}=-19.84\;{\rm{mag}}$$, $${M}_{{uvm}2}=-15.5\;{\rm{mag}}$$) and its low but almost constant Si ii velocities of about 10,000 km s -1 are similar to those in super-Chandrasekhar events, and its persistent carbon signatures in the spectra are weaker than those seen commonly in super-Chandrasekhar events. We estimate a 56Ni mass of $${0.81}_{-0.18}^{+0.10}{M}_{\odot }$$ and a total ejecta mass of $${1.59}_{-0.12}^{+0.45}{M}_{\odot }$$. Finally, the large ejecta mass of iPTF13asv and its stratified ejecta structure together seemingly favor a double-degenerate origin.
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [4] ;  [5] ; ORCiD logo [1] ; ORCiD logo [6] ; ORCiD logo [7] ; ORCiD logo [8] ;  [9] ;  [4] ;  [10] ; ORCiD logo [1] ;  [11] ; ORCiD logo [12] ;  [13] ;  [14]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States). Astronomy Dept.
  2. Weizmann Inst. of Science, Rehovot (Israel). Benoziyo Center for Astrophysics
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Computational Cosmology Center. Computational Research Division; Univ. of California, Berkeley, CA (United States). Dept. of Astronomy
  4. Stockholm Univ. (Sweden). Oskar Klein Centre. Physics Dept.
  5. Humboldt Univ. of Berlin (Germany). Inst. of Physics
  6. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States). Astrophysics Science Division; Univ. of Maryland, College Park, MD (United States). Joint Space-Science Inst.
  7. Univ. of California, Berkeley, CA (United States). Dept. of Astronomy; Space Telescope Science Inst., Baltimore, MD (United States)
  8. California Inst. of Technology (CalTech), Pasadena, CA (United States). Astronomy Dept.; Observatories of the Carnegie Inst. for Science, Pasadena, CA (United States)
  9. Stockholm Univ. (Sweden). Dept. of Astronomy. The Oskar Klein Center
  10. Florida State Univ., Tallahassee, FL (United States). Dept. of Physics; Aarhus Univ. (Denmark). Dept. of Physics and Astronomy
  11. California Inst. of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab.
  12. California Inst. of Technology (CalTech), Pasadena, CA (United States). Infrared Processing and Analysis Center
  13. National Autonomous Univ. of Mexico, Mexico City (Mexico). Inst. of Astronomy
  14. Univ. of Lyon (France). CNRS/IN2P3. Inst. of Nuclear Physics of Lyon
Publication Date:
Grant/Contract Number:
AC02-05CH11231; 1545949; NNX09AH71G; NNX09AT02G; NNX10AI27G; NNX12AE66G; LN 260369; IG100414
Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 823; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); California Inst. of Technology (CalTech), Pasadena, CA (United States); Stockholm Univ. (Sweden); Aarhus Univ. (Denmark); National Autonomous Univ. of Mexico, Mexico City (Mexico)
Sponsoring Org:
USDOE; National Science Foundation (NSF); National Aeronautic and Space Administration (NASA); Swedish Research Council (SRC); Swedish Space Board; Danish Agency for Science and Technology and Innovation (Denmark); National Council of Science and Technology (CONACYT) (Mexico); National Autonomous Univ. of Mexico (UNAM)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; supernovae; iPTF13asv; ultraviolet
OSTI Identifier:
1456945

Cao, Yi, Johansson, J., Nugent, Peter E., Goobar, A., Nordin, Jakob, Kulkarni, S. R., Cenko, S. Bradley, Fox, Ori D., Kasliwal, Mansi M., Fremling, C., Amanullah, R., Hsiao, E. Y., Perley, D. A., Bue, Brian D., Masci, Frank J., Lee, William H., and Chotard, Nicolas. Absence of Fast-Moving Iron in an Intermediate Type Ia Supernova Between Normal and Super-Chandrasekhar. United States: N. p., Web. doi:10.3847/0004-637X/823/2/147.
Cao, Yi, Johansson, J., Nugent, Peter E., Goobar, A., Nordin, Jakob, Kulkarni, S. R., Cenko, S. Bradley, Fox, Ori D., Kasliwal, Mansi M., Fremling, C., Amanullah, R., Hsiao, E. Y., Perley, D. A., Bue, Brian D., Masci, Frank J., Lee, William H., & Chotard, Nicolas. Absence of Fast-Moving Iron in an Intermediate Type Ia Supernova Between Normal and Super-Chandrasekhar. United States. doi:10.3847/0004-637X/823/2/147.
Cao, Yi, Johansson, J., Nugent, Peter E., Goobar, A., Nordin, Jakob, Kulkarni, S. R., Cenko, S. Bradley, Fox, Ori D., Kasliwal, Mansi M., Fremling, C., Amanullah, R., Hsiao, E. Y., Perley, D. A., Bue, Brian D., Masci, Frank J., Lee, William H., and Chotard, Nicolas. 2016. "Absence of Fast-Moving Iron in an Intermediate Type Ia Supernova Between Normal and Super-Chandrasekhar". United States. doi:10.3847/0004-637X/823/2/147. https://www.osti.gov/servlets/purl/1456945.
@article{osti_1456945,
title = {Absence of Fast-Moving Iron in an Intermediate Type Ia Supernova Between Normal and Super-Chandrasekhar},
author = {Cao, Yi and Johansson, J. and Nugent, Peter E. and Goobar, A. and Nordin, Jakob and Kulkarni, S. R. and Cenko, S. Bradley and Fox, Ori D. and Kasliwal, Mansi M. and Fremling, C. and Amanullah, R. and Hsiao, E. Y. and Perley, D. A. and Bue, Brian D. and Masci, Frank J. and Lee, William H. and Chotard, Nicolas},
abstractNote = {In this study, we report observations of a peculiar SN Ia iPTF13asv (a.k.a., SN2013cv) from the onset of the explosion to months after its peak. The early-phase spectra of iPTF13asv show an absence of iron absorption, indicating that synthesized iron elements are confined to low-velocity regions of the ejecta, which, in turn, implies a stratified ejecta structure along the line of sight. Our analysis of iPTF13asv's light curves and spectra shows that it is an intermediate case between normal and super-Chandrasekhar events. On the one hand, its light curve shape (B-band ${\rm{\Delta }}{m}_{15}=1.03\pm 0.01$) and overall spectral features resemble those of normal SNe Ia. On the other hand, its large peak optical and UV luminosity (${M}_{B}=-19.84\;{\rm{mag}}$, ${M}_{{uvm}2}=-15.5\;{\rm{mag}}$) and its low but almost constant Si ii velocities of about 10,000 km s-1 are similar to those in super-Chandrasekhar events, and its persistent carbon signatures in the spectra are weaker than those seen commonly in super-Chandrasekhar events. We estimate a 56Ni mass of ${0.81}_{-0.18}^{+0.10}{M}_{\odot }$ and a total ejecta mass of ${1.59}_{-0.12}^{+0.45}{M}_{\odot }$. Finally, the large ejecta mass of iPTF13asv and its stratified ejecta structure together seemingly favor a double-degenerate origin.},
doi = {10.3847/0004-637X/823/2/147},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 823,
place = {United States},
year = {2016},
month = {6}
}