The Young and Nearby Normal Type Ia Supernova 2018gv: UV-optical Observations and the Earliest Spectropolarimetry | |
Yang, Yi24; Hoeflich, Peter1; Baade, Dietrich23; Maund, Justyn R.22; Wang, Lifan18,21; Brown, Peter J.21; Stevance, Heloise F.17; Arcavi, Iair16; Burke, Jamison9,15; Cikota, Aleksandar14 | |
刊名 | ASTROPHYSICAL JOURNAL |
2020-10-01 | |
卷号 | 902期号:1页码:35 |
关键词 | polarization galaxies: individual (NGC 2525) supernovae: individual (SN 2018gv) |
ISSN号 | 0004-637X |
DOI | 10.3847/1538-4357/aba759 |
产权排序 | 第23完成单位 |
文献子类 | Article |
英文摘要 | The nondetection of companion stars in SN Ia progenitor systems lends support to the notion of double-degenerate systems and explosions triggered by the merging of two white dwarfs. This very asymmetric process should lead to a conspicuous polarimetric signature. By contrast, observations consistently find very low continuum polarization as the signatures from the explosion process largely dominate over the pre-explosion configuration within several days. Critical information about the interaction of the ejecta with a companion and any circumstellar matter is encoded in the early polarization spectra. In this study, we obtain spectropolarimetry of SN 2018gv with the ESO Very Large Telescope at -13.6 days relative to theB-band maximum light, or similar to 5 days after the estimated explosion-the earliest spectropolarimetric observations to date of any SN Ia. These early observations still show a low continuum polarization (less than or similar to 0.2%) and moderate line polarization (0.30% 0.04% for the prominent Siii lambda 6355 feature and 0.85% 0.04% for the high-velocity Ca component). The high degree of spherical symmetry implied by the low-line and continuum polarization at this early epoch is consistent with explosion models of delayed detonations and is inconsistent with the merger-induced explosion scenario. The dense UV and optical photometry and optical spectroscopy within the first similar to 100 days after the maximum light indicate that SN 2018gv is a normal SN Ia with similar spectrophotometric behavior to SN 2011fe. |
学科主题 | 天文学 ; 星系与宇宙学 ; 恒星与银河系 |
URL标识 | 查看原文 |
出版地 | TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND |
资助项目 | ESO VLT at the Paranal Observatory[0102.D-0528] ; NASA[NAS5-26555] ; Benoziyo Prize Postdoctoral Fellowship ; NSF project Signatures of Type Ia Supernovae, New Physics and Cosmology[AST-1715133] ; Royal Society University Research Fellowship ; NSF[AST-1817099] ; NSF[HST-GO-14139.001-A] ; NSF[AST-1813825] ; NSF[AST-1313484] ; NSF[AST-1821987] ; NSF[1821967] ; Mitchell Postdoctoral Fellowship ; University of Sheffield ; DIRAC Institute in the Department of Astronomy at the University of Washington ; National Natural Science Foundation of China (NSFC)[11178003] ; National Natural Science Foundation of China (NSFC)[11325313] ; NSFC[11773067] ; NSFC[11403096] ; Youth Innovation Promotion Association of the CAS[2018081] ; Western Light Youth Project of the CAS |
WOS关键词 | HIGH-VELOCITY FEATURES ; DELAYED-DETONATION MODEL ; WHITE-DWARF MODELS ; LIGHT CURVES ; RISE-TIME ; LINEAR SPECTROPOLARIMETRY ; EXPLOSION MODELS ; STANDARD STARS ; K-CORRECTIONS ; SN 2011FE |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | IOP PUBLISHING LTD |
WOS记录号 | WOS:000576554100001 |
资助机构 | ESO VLT at the Paranal Observatory[0102.D-0528] ; NASA[NAS5-26555] ; Benoziyo Prize Postdoctoral Fellowship ; NSF project Signatures of Type Ia Supernovae, New Physics and Cosmology[AST-1715133] ; Royal Society University Research Fellowship ; NSF[AST-1817099, HST-GO-14139.001-A, AST-1813825, AST-1313484, AST-1821987, 1821967] ; Mitchell Postdoctoral Fellowship ; University of Sheffield ; DIRAC Institute in the Department of Astronomy at the University of Washington ; National Natural Science Foundation of China (NSFC)[11178003, 11325313, 11773067, 11403096] ; Youth Innovation Promotion Association of the CAS[2018081] ; Western Light Youth Project of the CAS |
内容类型 | 期刊论文 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/23829] |
专题 | 云南天文台_丽江天文观测站(南方基地) |
通讯作者 | Yang, Yi |
作者单位 | 1.Department of Physics, Florida State University, Tallahassee, FL 32306-4350, USA 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, People's Republic of China 3.Yunnan Observatories (YNAO), Chinese Academy of Sciences, Kunming 650216, People's Republic of China 4.Physics Department and Tsinghua Center for Astrophysics (THCA), Tsinghua University, Beijing, 100084, People's Republic of China 5.Department of Astronomy, University of Texas at Austin, Austin, TX 78712, USA 6.Department of Optics & Quantum Electronics, University of Szeged, Dom ter 9, Szeged, 6720, Hungary 7.Konkoly Observatory, MTA CSFK, Konkoly Thege M. ut 15-17, Budapest, 1121, Hungary 8.Department of Physics, University of California, Davis, CA 95616, USA 9.Department of Physics, University of California, Santa Barbara, CA 93106-9530, USA 10.Steward Observatory, University of Arizona, 933 North Cherry Avenue, Room N204, Tucson, AZ 85721-0065, USA |
推荐引用方式 GB/T 7714 | Yang, Yi,Hoeflich, Peter,Baade, Dietrich,et al. The Young and Nearby Normal Type Ia Supernova 2018gv: UV-optical Observations and the Earliest Spectropolarimetry[J]. ASTROPHYSICAL JOURNAL,2020,902(1):35. |
APA | Yang, Yi.,Hoeflich, Peter.,Baade, Dietrich.,Maund, Justyn R..,Wang, Lifan.,...&Zhang JJ.(2020).The Young and Nearby Normal Type Ia Supernova 2018gv: UV-optical Observations and the Earliest Spectropolarimetry.ASTROPHYSICAL JOURNAL,902(1),35. |
MLA | Yang, Yi,et al."The Young and Nearby Normal Type Ia Supernova 2018gv: UV-optical Observations and the Earliest Spectropolarimetry".ASTROPHYSICAL JOURNAL 902.1(2020):35. |
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