Spectroscopy of the Type Ic Supernova SN 2017iuk Associated with Low-redshift GRB 171205A

Abstract

We here report a spectroscopic monitor for the supernova SN 2017iuk associated with the long-duration lowluminosity gamma-ray burst GRB 171205A at a redshift of 0.037, which is up to now the third GRB-SN event away from us. Our spectroscopic observations and spectral analysis allow us to identify SN 2017iuk as a typical broad-line type Ic SN. A comparison study suggests that the type-IcBL SN 2017iuk resembles to SN 2006aj in following aspects: 1) similar spectra at the nearby epochs, 2) comparable evolution of the photospheric velocity obtained from the measurements based on both Si IIλ6355 line and spectral modeling, and 3) comparable explosion parameters. This analogy could imply a formation of a neutron star in the core-collapse of GRB 171205A/SN 2017iuk as previously suggested in GRB 060218/SN 2006aj. The properties of the host galaxy is discussed, which suggests that GRB 171205A/SN 2017iuk occurred in an early type (S0), high-mass, starforming galaxy with low specific SFR and solar metallicity.

Cosmological Fast Optical Transients with the Zwicky Transient Facility: A Search for Dirty Fireballs

“…The optical light curves of AT 2021any and AT 2021lfa have temporal indices that are similar to those of LGRB optical afterglows in the literature (Zeh et al 2006;Kann et al 2010;Li et al 2012;Wang et al 2018). The AT 2021lfa power-law index of α = 2.54 ± 0.02 is close to expectations for synchrotron emission from a powerlaw distribution of electrons after the edge of the jet is visible, for a typical electron energy power-law index of p = 2.5 (Sari et al 1999).…”

“…At early times, the afterglow decay would have been shallower. The fact that we did not observe the transition suggests that it occurred within a day of the burst in the rest-frame, which is common for LGRB optical afterglows (Zeh et al 2006;Kann et al 2010;Wang et al 2018), and enables us to estimate the opening angle of the jet. To estimate the opening angle, we use the expression from Sari et al (1999):…”

SN 2020bvc: A Broad-line Type Ic Supernova with a Double-peaked Optical Light Curve and a Luminous X-Ray and Radio Counterpart

“…The position of SN 2020bvc is 13″ (7.2 kpc 28 ) from the center of UGC 09379 (z=0.025201±0.000021 from NED 29 ), which also hosted PTF 13ast , comparable to the Milky Way and other large spirals. The stellar mass of UGC 09379 is larger than that of all known GRB SN host galaxies (Hjorth & Bloom 2012;Taggart & Perley 2019) and similar only to the host galaxy of LLGRB 171205A/SN 2017iuk (D'Elia et al 2018;Wang et al 2018;Izzo et al 2019), which had =  M M log 10.1 0.1 10 ( )  (Perley & Taggart 2017). The stellar mass of UGC 09379 is also larger than that of most Ic-BL SN host galaxies (Modjaz et al 2020), with the exception of SN 2002ap 30 and SN 1997ef 31 .…”

Chemical stratification in a long gamma-ray burst cocoon and early-time spectral signatures of supernovae associated with gamma-ray bursts

“…More striking evidence of heavy elements in early-time GRB-SN spectra was obtained in the follow-up observa-tions of GRB 171205A/SN 2017iuk (D'Elia et al 2018;Wang et al 2018;Izzo et al 2019). The optical observations started < 1 day after the gamma-ray detection (Izzo et al 2019) identified high-velocity ejecta with an expansion velocity higher than 0.3c and blue-shifted absorption features of explosive nucleosynthesis products, such as Ca and Si.…”