Mid-IR Spectrum of Supernova SN 2014J in M82
ATel #6018; D. Li (U. Florida), C. M. Telesco (U. Florida), C. Alvarez (Instituto de Astrofisica de Canarias, Universidad de La Laguna), P. J. Barnes (U. Florida), S. Fernandez (Instituto de Astrofisica de Canarias), P. Hoflich (Florida State U.), N. Marinas (U. Florida), C. Packham (U. Texas, San Antonio), C. M. Wright (U. New South Wales), and H. Zhang (U. Florida)
on 28 Mar 2014; 00:23 UT
Credential Certification: Dan Li (d.li@ufl.edu)
Subjects: Infra-Red, Supernovae
On behalf of the CanariCam Science Team, we report the measurement of the 8-13 micrometer spectrum of the Type Ia supernova 2014J using CanariCam at the 10.4-m Gran Telescopio CANARIAS (GTC). The total integration time was 2400 s (on-source, excluding overhead) starting at UT 2014 Mar 12.95. The achieved spectral resolution is about 0.1 micrometer (3000 km/s). The high-quality spectrum shows what we interpret to be the [Ar III], [Co II]+[S IV], and [Co III] lines centered near 9.0, 10.5, and 11.9 micrometers, respectively. The peak flux density of the [Co III] line is about 60 mJy, with a FWHM about 0.5-0.6 micrometers (12000-13000 km/s). In addition to the spectrum, we obtained CanariCam images of the SN in the same night at 8.7 and 11.75 micrometers through filters with bandwidths of 1.1 and 2.5 micrometers, respectively. Compared with the photometric measurements we reported in ATel #5903, the flux in the 11.75-micrometer filter has increased noticeably since UT Feb 10.12, possibly as a result of a change in the strength of the [Co III] line. The data reported here were obtained using CanariCam Guaranteed Time awarded to U. Florida for development of CanariCam. The GTC is a joint initiative of Spain, the University of Florida, and Mexico.
