期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 514, 期 2, 页码 2627-2649出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stac1371
关键词
supernovae: general; supernovae: individual: SN2002gh
资金
- National Science Foundation
- VILLUM FONDEN [28021]
- Independent Research Fund Denmark (IRFD) [8021-00170B]
- US Department of Energy
- US National Science Foundation
- Ministry of Science and Education of Spain
- Science and Technology Facilities Council of the United Kingdom
- Higher Education Funding Council for England
- National Center for Supercomputing Applications at the University of Illinois at Urbana Champaign
- Kavli Institute for Cosmological Physics at the University of Chicago
- Center for Cosmology and Astro-Particle Physics at the Ohio State University
- Mitchell Institute for Fundamental Physics and Astronomy at Texas AM University
- Financiadora de Estudos e Projetos
- Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico
- Ministerio da Ciencia, Tecnologia e Inovacao
- Deutsche Forschungsgemeinschaft
- Argonne National Laboratory
- University of California at Santa Cruz
- University of Cambridge
- Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas-Madrid
- University of Chicago
- University College London
- DES-Brazil Consortium
- University of Edinburgh
- Eidgenossische Technische Hochschule (ETH) Zurich
- Fermi National Accelerator Laboratory
- University of Illinois at Urbana Champaign
- Institut de Ciencies de l'Espai (IEEC/CSIC)
- Institut de Fisica d'Altes Energies
- Lawrence Berkeley National Laboratory
- Ludwig-Maximilians Universitat Munchen
- University of Michigan
- NSF's NOIRLab
- University of Nottingham
- Ohio State University
- OzDES Membership Consortium
- University of Pennsylvania
- University of Portsmouth
- SLAC National Accelerator Laboratory
- Stanford University
- University of Sussex
- Texas AM University
- NOIRLab [2014B-0404, 2019A-0305]
This study presents the optical photometry and spectroscopy of the superluminous SN 2002gh, revealing it as one of the most luminous supernovae discovered. The host galaxy of the supernova is identified as a faint dwarf galaxy. The study explores the power mechanism of the supernova and proposes two alternative explanations.
We present optical photometry and spectroscopy of the superluminous SN 2002gh from maximum light to +204 d, obtained as part of the Carnegie Type II Supernova (CATS) project. SN 2002gh is among the most luminous discovered supernovae ever, yet it remained unnoticed for nearly two decades. Using Dark Energy Camera archival images we identify the potential supernova (SN) host galaxy as a faint dwarf galaxy, presumably having low metallicity, and in an apparent merging process with other nearby dwarf galaxies. We show that SN 2002gh is among the brightest hydrogen-poor SLSNe with M-V = -22.40 +/- 0.02, with an estimated peak bolometric luminosity of 2.6 +/- 0.1 x 10(44) erg s(-1). We discount the decay of radioactive nickel as the main SN power mechanism, and assuming that the SN is powered by the spin-down of a magnetar we obtain two alternative solutions. The first case, is characterized by significant magnetar power leakage, and M-ej between 0.6 and 3.2 M-circle dot, P-spin = 3.2 ms, and B = 5 x 10(13) G. The second case does not require power leakage, resulting in a huge ejecta mass of about 30 M-circle dot, a fast spin period of P-spin similar to 1 ms, and B similar to 1.6 x 10(14) G. We estimate a zero-age main-sequence mass between 14 and 25 M-circle dot for the first case and of about 135 M-circle dot for the second case. The latter case would place the SN progenitor among the most massive stars observed to explode as an SN.
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