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AT2018cow: HCT spectroscopic follow-up

ATel #11759; Avinash Singh (IIA), Shubham Srivastav (IITB), Brajesh Kumar (IIA), Harsh Kumar (IITB), Varun Bhalerao (IITB), G. C. Anupama (IIA), D. K. Sahu (IIA)
on 22 Jun 2018; 14:43 UT
Credential Certification: Shubham Srivastav (shubhamsrivastav@iitb.ac.in)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 11766, 11776

We report follow-up spectroscopic observations of AT2018cow (Smartt et al. ATel #11727) with the 2-metre HCT. A spectrum spanning 3700-9100A was obtained on 2018 June 21.62 UT. A blackbody fit to the spectrum indicates a temperature of ~10500K, cooling down from ~11200K deduced for the spectrum obtained on June 20.85 UT (ATel #11748). The 4000-5500A region shows evidence of emergence of broad underlying features, as observed by Izzo et al. (ATel #11753). We deduce a velocity of ~25,000 km/sec, assuming the feature at ~4800A corresponds to FeII 5169A (ATel #11753).

Comparison plot of the HCT June 20.85UT and June 21.62UT spectra.