@article{a6adc5c4c9c84dcea7ab9c30baf02a28,
title = "H alpha emission in the nebular spectrum of the Type Ia supernova ASASSN-18tb",
abstract = "As part of the 100IAS survey, a program aimed to obtain nebular-phase spectra for a volume-limited and homogeneous sample of Type Ia supernovae (SNe Ia), we observed ASASSN-18tb (SN 2018fhw) at 139 d past maximum light. ASASSN-18tb was a fast-declining, sub-luminous event that fits well within the observed photometric and spectroscopic distributions of the SN Ia population. We detect a prominent H alpha emission line (L-H alpha = 2.2 +/- 0.2 x 10(38) ergs s(-1)) with FWHM approximate to 1100 km s(-1) in the nebular-phase spectrum of this SN Ia. High-luminosity H alpha emission (L-H alpha greater than or similar to 10(40) ergs s(-1)) has previously been discovered in a rare class of SNe Ia-like objects showing circum-stellar medium (CSM) interactions (SNe Ia-CSM). They predominantly belong to overluminous (M-max",
author = "Kollmeier, \{Juna A.\} and Ping Chen and Subo Dong and Nidia Morrell and Phillips, \{M. M.\} and Doron Kushnir and Prieto, \{J. L.\} and Piro, \{Anthony L.\} and Simon, \{Joshua D.\}",
note = "We thank Boaz Katz for important discussions and insights as well as significant contributions to this paper. PC and SD acknowledge Project 11573003 supported by NSFC. Support for JLP is provided in part by FONDECYT through the grant 1191038 and by the Ministry of Economy, Development, and Tourisms Millennium ScienceInitiative through grant IC120009, awarded to The Millennium Institute of Astrophysics, MAS. This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile. This project used public archival data from the Dark Energy Survey (DES). Funding for the DES Projects has been provided by the U.S. Department of Energy, the U.S. National Science Foundation, the Ministry of Science and Education of Spain, the Science and Technology Facilities Council of the United Kingdom, the Higher Education Funding Council for England, the National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign, the Kavli Institute of Cosmological Physics at the University of Chicago, the Center for Cosmology and Astro-Particle Physics at the Ohio State University, the Mitchell Institute for Fundamental Physics and Astronomy at Texas A\&M University, Financiadora de Estudos e Projetos, Funda{\c c}{\~a}o Carlos Chagas Filho de Amparo {\`a} Pesquisa do Estado do Rio de Janeiro, Conselho Nacional de Desenvolvimento Cient{\'i}fico e Tecnol{\'o}gico and the Minist{\'e}rio da Ci{\^e}ncia, Tecnologia e Inova{\c c}{\~a}o, the Deutsche Forschungsgemeinschaft, and the Collaborating Institutions in the Dark Energy Survey. The Collaborating Institutions are the Argonne National Laboratory, the University of California at Santa Cruz, the University of Cambridge, the Centro de Investigaciones Energ{\'e}ticas, Medioambientales y Tecnol{\'o}gicas-Madrid, the University of Chicago, the University College London, the DES-Brazil Consortium, the University of Edinburgh, the Eidgen{\"o}ssische Technische Hochschule (ETH) Z{\"u}rich, the Fermi National Accelerator Laboratory, the University of Illinois at Urbana-Champaign, the Institut de Ci{\`e}ncies de l{\textquoteright}Espai (IEEC/CSIC), the Institut de F{\'i}sica d{\textquoteright}Altes Energies, the Lawrence Berkeley National Laboratory, the Ludwig-Maximilians Universit{\"a}t M{\"u}nchen, and the associated Excellence Cluster Universe, the University of Michigan, the National Optical Astronomy Observatory, the University of Nottingham, the Ohio State University, the OzDES Membership Consortium, the University of Pennsylvania, the University of Portsmouth, the SLAC National Accelerator Laboratory, Stanford University, the University of Sussex, and the Texas A\&M University. This research uses data obtained through the Telescope Access Program (TAP), which has been funded by the National Astronomical Observatories of China, the Chinese Academy of Sciences, and the Special Fund for Astronomy from the Ministry of Finance. Based in part on observations at the Cerro Tololo Inter-American Observatory, the National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation.",
year = "2019",
month = jul,
doi = "10.1093/mnras/stz953",
language = "الإنجليزيّة",
volume = "486",
pages = "3041--3046",
journal = "MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "3",
}