J/ApJ/927/61 Spectroscopic follow-up of Type Ib SN 2017iro (Kumar+, 2022) ================================================================================ Investigating the observational properties of type Ib supernova SN 2017iro. Kumar B., Singh A., Sahu D.K., Anupama G.C. =2022ApJ...927...61K ================================================================================ ADC_Keywords: Supernovae; Spectra, optical Keywords: Type Ib supernovae ; Supernovae ; Core-collapse supernovae Abstract: We report results of optical imaging and low-resolution spectroscopic monitoring of supernova (SN) 2017iro that occurred in the nearby (~31Mpc) galaxy NGC 5480. The HeI{lambda}5876 feature present in the earliest spectrum (-7d) classified it as a Type Ib SN. The follow-up observations span from -7 to +266d with respect to the B-band maximum. With a peak absolute magnitude in V band M_V_=-17.76+/-0.15mag and bolometric luminosity log_10_L=42.39+/-0.09erg/s, SN 2017iro is a moderately luminous Type Ib SN. The overall light-curve evolution of SN 2017iro is similar to that of SN 2012au and SN 2009jf during the early (up to ~100d) and late phases (>150d), respectively. The line velocities of both FeII{lambda}5169 and HeI{lambda}5876 are ~9000km/s near the peak. The analysis of the nebular phase spectrum (~+209d) indicates an oxygen mass of ~0.35M_{sun}_. The smaller [OI]/[CaII] flux ratio of ~1 favors a progenitor with a zero-age main-sequence mass in the range ~13-15M_{sun}_, most likely in a binary system, similar to the case of iPTF13bvn. The explosion parameters are estimated by applying different analytical models to the quasi-bolometric light curve of SN 2017iro. ^56^Ni mass synthesized in the explosion has a range of ~0.05-0.10M_{sun}_, ejecta mass ~1.4-4.3M_{sun}_, and kinetic energy ~(0.8-1.9)x10^51^erg. Description: The photometric follow-up of SN 2017iro started just after the announcement of its discovery, i.e., 2017 December 1 (JD2458089.5), and continued up to 2018 August 31 (JD2458362.1). These observations were performed in Bessell UBVRI bands with the Himalayan Faint Object Spectrograph Camera (HFOSC), mounted on the f/9 Cassegrain focus of the 2m Himalayan Chandra Telescope (HCT) of Indian Astronomical Observatory (IAO), Hanle, India. Low-resolution optical spectroscopic observations of SN2017iro were obtained at 34 epochs from 2017-Dec-01 (JD2458089.4) to 2018-Jul-05 (JD2458305.2). Two grisms Gr#7 (3500-7800{AA}) and Gr#8 (5200-9250{AA}), available with HFOSC, were used to obtain the SN2017iro spectra. Objects: ---------------------------------------------------------- RA (ICRS) DE Designation(s) ---------------------------------------------------------- 14 06 23.10 +50 43 20.2 SN 2017iro = SN 2017iro ---------------------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file spectra.dat 54 34 Journal of spectroscopic observations of SN 2017iro (Data behind Figures 6, 8 and 9) sp/* . 34 The individual spectra in ASCII format -------------------------------------------------------------------------------- See also: II/183 : UBVRI Photometric Standards (Landolt 1992) J/MNRAS/372/1315 : UBVRI photometry of SN 2004et (Sahu+, 2006) J/A+A/465/71 : 21cm observations of 452 galaxies (Theureau+, 2007) J/MNRAS/389/955 : u'BVg'r'i'z' light curves of SN 2008ax (Pastorello+, 2008) J/MNRAS/383/1485 : BVRI light curves of SN 2003jd (Valenti+, 2008) J/ApJ/692/L84 : Photometry of SN 2008D (Malesani+, 2009) J/ApJ/702/226 : Swift/UVOT panchromatic obs. of SN 2008D (Modjaz+, 2009) J/ApJ/742/L18 : Follow-up photometry of the SN IIb PTF 11eon (Arcavi+, 2011) J/ApJ/741/97 : Light curves of Ibc supernovae (Drout+, 2011) J/MNRAS/412/1441 : SNe luminosity functions (Li+, 2011) J/MNRAS/416/3138 : SN 2009jf light curves (Valenti+, 2011) J/other/Sci/337.444 : RV curves of Galactic massive O stars (Sana+, 2012) J/MNRAS/436/774 : Core collapse supernovae (type Ibc) (Eldridge+, 2013) J/MNRAS/431/308 : SN 2011fu BVRI light curves (Kumar+, 2013) J/ApJS/213/19 : Optical and near-IR light curves of 64 SNe (Bianco+, 2014) J/AJ/147/99 : Spectrosc. of 73 stripped core-collapse SNe (Modjaz+, 2014) J/MNRAS/454/95 : SN 2011fu UBVRI griz JHKs LCs (Morales-Garoffolo+, 2015) J/A+A/574/A60 : Light curve templates of SNe Ib/c from SDSS (Taddia+, 2015) J/ApJ/825/L22 : BVRI LCs of type Ib supernova iPTF13bvn (Folatelli+, 2016) J/A+A/593/A68 : PTF12os and iPTF13bvn spectra & LCs (Fremling+, 2016) J/ApJ/827/90 : Spectroscopy of SNe Ib, IIb and Ic (Liu+, 2016) J/ApJ/837/120 : Lick Observatory SN Search (LOSS) revisited (Graur+, 2017) J/MNRAS/482/1545 : Berkeley sample of stripped-envelope SNe (Shivvers+, 2019) Byte-by-byte Description of file: spectra.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 10 A10 "Y/M/D" Date Date of observation 12- 17 F6.1 d JD [8089.4/8305.2] Julian Day; JD-2450000 19- 24 F6.1 d Phase [-6.8/209] Phase with reference to the B-band maximum (JD2458096.2) 26- 32 A7 --- Grisms Grisms observed - Gr7 & Gr8 34- 42 A9 0.1nm Sp1 Gr7 (3500-7800{AA}) 44- 52 A9 0.1nm Sp2 Gr8 (5200-9250{AA}) 54 A1 0.1nm Res [7] Resolution ({AA}) -------------------------------------------------------------------------------- Byte-by-byte Description of file: sp/* -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 9 F9.4 0.1nm lambda [3072.6/9272.1] Wavelength, Angstroms, redshift-corrected 11- 21 E11.4 cW/m2/nm Flux [-2e-11/9e-10]? Calibrated flux, in erg/s/cm^2^/{AA} -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Prepared by [AAS], Emmanuelle Perret [CDS] 10-Nov-2023