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Spatially Resolved X-Ray Study of Supernova Remnant G306.3–0.9 with Unusually High Calcium Abundance

Weng, Jianbin and Zhou, Ping and Chen, Yang and Leung, Shing-Chi and Toonen, Silvia and Perets, Hagai B. and Nomoto, Ken’ichi and Zenati, Yossef and Vink, Jacco (2022) Spatially Resolved X-Ray Study of Supernova Remnant G306.3–0.9 with Unusually High Calcium Abundance. Astrophysical Journal, 924 (2). Art. No. 119. ISSN 0004-637X. doi:10.3847/1538-4357/ac308d.

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G306.3–0.9 is an asymmetric Galactic supernova remnant (SNR), whose progenitor has been thought to be a Type Ia supernova (SN), but its high Ca abundance appears inconsistent with the Type Ia origin. Hoping to uncover the reason for its asymmetry and the origin of this SNR, we performed a spatially resolved X-ray spectroscopic analysis of XMM-Newton and Chandra observation data. We divided the SNR into 13 regions and analyzed the spectra using two-temperature models (0.2 keV + 1 keV). Compared to the southwestern regions, the northeastern regions have higher metal abundances and a lower gas density. This suggests that the asymmetric morphology results from the nonuniform ambient environment. We found that neither Type Ia nor core-collapse SN models can account for the abnormally high abundance ratios of Ar/Si, Ca/Si, or the shape of the abundance curve. A comparison with the Ca-rich transient models suggests that G306.3–0.9 is likely to be the first identified Galactic Ca-rich transient remnant, although the theoretical production of element S is lower. We also note that the conclusion for the SNR’s origin relies on the measured abundance ratios and existing nucleosynthesis models. Between two groups of Ca-rich transient explosion models, we prefer the He shell detonation for an accreting white dwarf, rather than the merger of a white dwarf and a neutron star.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Weng, Jianbin0000-0002-3576-441X
Zhou, Ping0000-0002-5683-822X
Chen, Yang0000-0002-4753-2798
Leung, Shing-Chi0000-0002-4972-3803
Perets, Hagai B.0000-0002-5004-199X
Nomoto, Ken’ichi0000-0001-9553-0685
Vink, Jacco0000-0002-4708-4219
Additional Information:© 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2021 June 30; revised 2021 October 13; accepted 2021 October 14; published 2022 January 18. J.W. acknowledges the help and advice on spectral analysis from Lei Sun. This study is partially based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO program 0103.D-0387. J.W, P.Z., and Y.C. thank the support of NSFC grants 11773014, 11633007, 11851305, 11503008, and 11590781. P.Z. also acknowledges support from the Nederlandse Onderzoekschool Voor Astronomie (NOVA) and the NWO Veni Fellowship grant No. 639.041.647. S.-C.L. acknowledges support from NASA grants HST-AR-15021.001-A and 80NSSC18K1017. H.B.P. acknowledges support for this project from the European Union's Horizon 2020 research and innovation program under grant agreement No. 865932-ERC-SNeX. S.T. acknowledges support from the Netherlands Research Council NWO (VENI 639.041.645 grants). K.N. has been supported by the World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan, and JSPS KAKENHI grant Nos. JP17K05382, JP20K04024, and JP21H04499. Software: ATOMDB (Smith et al. 2001; Foster et al. 2012), CIAO (v4.12, Fruscione et al. 2006), DS9 (Joye & Mandel 2003), SAS (v16.1.0, Gabriel et al. 2004), XSPEC (v12.10.1f, Arnaud 1996).
Group:TAPIR, Walter Burke Institute for Theoretical Physics
Funding AgencyGrant Number
European Southern Observatory (ESO)0103.D-0387
National Natural Science Foundation of China11773014
National Natural Science Foundation of China11633007
National Natural Science Foundation of China11851305
National Natural Science Foundation of China11503008
National Natural Science Foundation of China11590781
Nederlandse Onderzoekschool voor de Astronomie (NOVA)UNSPECIFIED
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)639.041.647
NASA Hubble FellowshipHST-AR-15021.001-A
European Research Council (ERC)865932
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)639.041.645
Ministry of Education, Culture, Sports, Science and Technology (MEXT)UNSPECIFIED
Japan Society for the Promotion of Science (JSPS)JP17K05382
Japan Society for the Promotion of Science (JSPS)JP20K04024
Japan Society for the Promotion of Science (JSPS)JP21H04499
Subject Keywords:Supernova remnants; Interstellar medium; Explosive nucleosynthesis; Abundance ratios; X-ray astronomy
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Supernova remnants (1664); Interstellar medium (847); Explosive nucleosynthesis (503); Abundance ratios (11); X-ray astronomy (1810)
Record Number:CaltechAUTHORS:20220118-993899000
Persistent URL:
Official Citation:Jianbin Weng et al 2022 ApJ 924 119
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:112957
Deposited By: George Porter
Deposited On:19 Jan 2022 15:30
Last Modified:19 Jan 2022 15:30

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