Journal article
The Lowest of the Low: Discovery of SN 2019gsc and the Nature of Faint Iax Supernovae
S Srivastav, SJ Smartt, G Leloudas, ME Huber, K Chambers, DB Malesani, J Hjorth, JH Gillanders, A Schultz, SA Sim, K Auchettl, JPU Fynbo, C Gall, OR McBrien, A Rest, KW Smith, R Wojtak, DR Young
Astrophysical Journal Letters | IOP PUBLISHING LTD | Published : 2020
Abstract
We present the discovery and optical follow-up of the faintest supernova-like transient known. The event (SN 2019gsc) was discovered in a star-forming host at 53 Mpc by ATLAS. A detailed multicolor light curve was gathered with Pan-STARRS1 and follow-up spectroscopy was obtained with the Nordic Optical Telescope and Gemini-North. The spectra near maximum light show narrow features at low velocities of 3000-4000 km s-1, similar to the extremely low-luminosity SNe 2010ae and 2008ha, and the light curve displays a similar fast decline (Δm 15(r) = 0.91 ± 0.10 mag). SNe 2010ae and 2008ha have been classified as SNe Iax, and together the three either make up a distinct physical class of their own ..
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Awarded by Science and Technology Facilities Council
Funding Acknowledgements
Data are from the Asteroid Terrestrial-impact Last Alert System project (NASA grants NN12AR55G, 80NSSC18K0284, and 80NSSC18K1575), byproducts of the NEO search include images and catalogs from the survey area, through the contributions of the University of Hawaii Institute for Astronomy, the Queen's University Belfast, the Space Telescope Science Institute, and the South African Astronomical Observatory. Pan-STARRS is supported by the NASA Grants, including No. NNX14AM74G through the SSO NEO Observations Program. S.J.S., S.S., S.A.S., D.R.Y., and K.W.S. acknowledge STFC Grants ST/P000312/1, ST/N006550/1, ST/N002520/1, and ST/S006109/1. S.S. thanks B. Barna and M. R. Magee for useful discussions. G.L. and D.B.M. acknowledge research grant 19054 from VILLUM FONDEN. C.G. acknowledges VILLUM FONDEN research grant 25501. This work was supported by a VILLUM FONDEN Investigator grant 16599 to J.H. K.A.A. acknowledges DNRF132. We thank Jonatan Selsing for help with NOT spectroscopic reductions. Nordic Optical Telescope (programs 59-008 and 59-509), operated by the NOT Scientific Association at the Observatory del Roque de los Muchachos, La Palma, Spain, of the IAC. Gemini observatory (program GN-2019A-Q-126) is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnologia e Innovacion Productiva (Argentina), Ministerio da Ciencia, Tecnologia e Inovacao (Brazil), and Korea Astronomy and Space Science Institute (Republic of Korea). We made use of TARDIS supported by the Google Summer of Code and ESA's Summer of Code in Space.