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AT2018cow - HCT spectroscopy

ATel #11748; Brajesh Kumar (IIA), Shubham Srivastav (IITB), Avinash Singh (IIA), Harsh Kumar (IITB), Varun Bhalerao (IITB), G. C. Anupama (IIA), D. K. Sahu (IIA)
on 21 Jun 2018; 10:50 UT
Credential Certification: Varun Bhalerao (varunb@iitb.ac.in)

Subjects: Optical, Cataclysmic Variable, Nova, Supernovae, Transient

Referred to by ATel #: 11749, 11753, 11759

We report spectroscopic observations of AT2018cow (Smartt et al. ATel #11727, #11742) with the 2-metre HCT. The spectrum spanning 3500-9000A was obtained using the HFOSC instrument on 2018-06-20.85 UT (MJD 58289.7). We confirm Ca H & K features (Jones et al. ATel #11736) at z = 0.014, the redshift of the putative host galaxy CGCG 137-068. We also detect Galactic NaI doublet at the rest wavelength, along with H-alpha emission feature at the rest wavelength of the host galaxy (consistent with Perley ATel #11732). We do not detect strong H-beta, however (Selsing et al. ATel #11741). In addition, we see a Galactic DIB feature at 5797A, along with a tentative Galactic DIB at 6283A. The spectrum also indicates a weak, broad absorption feature at ~5040A (consistent with Xu et al. ATel #11740), with a Gaussian FWHM of ~26A. We will continue to monitor this source with the HCT.