ASASSN-15pz: Revealing Significant Photometric Diversity among 2009dc-like, Peculiar SNe Ia
We report comprehensive multi-wavelength observations of a peculiar Type Ia-like supernova (“SN Ia-pec”) ASASSN-15pz. ASASSN-15pz is a spectroscopic “twin” of SN 2009dc, a so-called “Super-Chandrasekhar-mass” SN, throughout its evolution, but it has a peak luminosity that is dimmer and comparable to...
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| Veröffentlicht in: | The Astrophysical journal 2019-07, Vol.880 (1), p.35 |
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| creator | Chen, Ping Dong, Subo Katz, Boaz Kochanek, C. S. Kollmeier, Juna A. Maguire, K. Phillips, M. M. Prieto, J. L. Shappee, B. J. Stritzinger, M. D. Bose, Subhash Brown, Peter J. Holoien, T. W.-S. Galbany, L. Milne, Peter A. Morrell, Nidia Piro, Anthony L. Stanek, K. Z. Thompson, Todd A. Young, D. R. |
| description | We report comprehensive multi-wavelength observations of a peculiar Type Ia-like supernova (“SN Ia-pec”) ASASSN-15pz. ASASSN-15pz is a spectroscopic “twin” of SN 2009dc, a so-called “Super-Chandrasekhar-mass” SN, throughout its evolution, but it has a peak luminosity
that is
dimmer and comparable to the SN 1991T sub-class of SNe Ia at the luminous end of the normal width-luminosity relation. The synthesized
56
Ni mass of
is also substantially less than that found for several 2009dc-like SNe. Previous well-studied 2009dc-like SNe have generally suffered from large and uncertain amounts of host-galaxy extinction, which is negligible for ASASSN-15pz. Based on the color of ASASSN-15pz, we estimate a host extinction for SN 2009dc of
and confirm its high luminosity (
). The 2009dc-like SN population, which represents ∼1% of SNe Ia, exhibits a range of peak luminosities, and do not fit onto the tight width-luminosity relation. Their optical light curves also show significant diversity of late-time (≳50 days) decline rates. The nebular-phase spectra provide powerful diagnostics to identify the 2009dc-like events as a distinct class of SNe Ia. We suggest referring to these sources using the phenomenology-based “2009dc-like SN Ia-pec” instead of “Super-Chandrasekhar SN Ia,” which is based on an uncertain theoretical interpretation. |
| doi_str_mv | 10.3847/1538-4357/ab2630 |
| format | Article |
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that is
dimmer and comparable to the SN 1991T sub-class of SNe Ia at the luminous end of the normal width-luminosity relation. The synthesized
56
Ni mass of
is also substantially less than that found for several 2009dc-like SNe. Previous well-studied 2009dc-like SNe have generally suffered from large and uncertain amounts of host-galaxy extinction, which is negligible for ASASSN-15pz. Based on the color of ASASSN-15pz, we estimate a host extinction for SN 2009dc of
and confirm its high luminosity (
). The 2009dc-like SN population, which represents ∼1% of SNe Ia, exhibits a range of peak luminosities, and do not fit onto the tight width-luminosity relation. Their optical light curves also show significant diversity of late-time (≳50 days) decline rates. The nebular-phase spectra provide powerful diagnostics to identify the 2009dc-like events as a distinct class of SNe Ia. We suggest referring to these sources using the phenomenology-based “2009dc-like SN Ia-pec” instead of “Super-Chandrasekhar SN Ia,” which is based on an uncertain theoretical interpretation.</description><identifier>ISSN: 0004-637X</identifier><identifier>EISSN: 1538-4357</identifier><identifier>DOI: 10.3847/1538-4357/ab2630</identifier><language>eng</language><publisher>Philadelphia: IOP Publishing</publisher><subject>Astrophysics ; Biological evolution ; Extinction ; Galaxies ; Light curve ; Luminosity ; Phenomenology ; Supernova</subject><ispartof>The Astrophysical journal, 2019-07, Vol.880 (1), p.35</ispartof><rights>Copyright IOP Publishing Jul 20, 2019</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c379t-431bd66463869085d2302bc93789be30c906ae05ce6eb6629a514d37ee0850933</citedby><cites>FETCH-LOGICAL-c379t-431bd66463869085d2302bc93789be30c906ae05ce6eb6629a514d37ee0850933</cites><orcidid>0000-0001-9206-3460 ; 0000-0002-1229-2499 ; 0000-0001-6806-0673 ; 0000-0001-6017-2961 ; 0000-0002-1296-6887 ; 0000-0003-0853-6427 ; 0000-0003-2734-0796 ; 0000-0002-0370-157X ; 0000-0003-0943-0026 ; 0000-0002-5571-1833 ; 0000-0003-0584-2920 ; 0000-0003-4631-1149 ; 0000-0002-1027-0990 ; 0000-0001-9852-1610 ; 0000-0003-3529-3854 ; 0000-0003-2535-3091 ; 0000-0001-6272-5507</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>Chen, Ping</creatorcontrib><creatorcontrib>Dong, Subo</creatorcontrib><creatorcontrib>Katz, Boaz</creatorcontrib><creatorcontrib>Kochanek, C. S.</creatorcontrib><creatorcontrib>Kollmeier, Juna A.</creatorcontrib><creatorcontrib>Maguire, K.</creatorcontrib><creatorcontrib>Phillips, M. M.</creatorcontrib><creatorcontrib>Prieto, J. L.</creatorcontrib><creatorcontrib>Shappee, B. J.</creatorcontrib><creatorcontrib>Stritzinger, M. D.</creatorcontrib><creatorcontrib>Bose, Subhash</creatorcontrib><creatorcontrib>Brown, Peter J.</creatorcontrib><creatorcontrib>Holoien, T. W.-S.</creatorcontrib><creatorcontrib>Galbany, L.</creatorcontrib><creatorcontrib>Milne, Peter A.</creatorcontrib><creatorcontrib>Morrell, Nidia</creatorcontrib><creatorcontrib>Piro, Anthony L.</creatorcontrib><creatorcontrib>Stanek, K. Z.</creatorcontrib><creatorcontrib>Thompson, Todd A.</creatorcontrib><creatorcontrib>Young, D. R.</creatorcontrib><title>ASASSN-15pz: Revealing Significant Photometric Diversity among 2009dc-like, Peculiar SNe Ia</title><title>The Astrophysical journal</title><description>We report comprehensive multi-wavelength observations of a peculiar Type Ia-like supernova (“SN Ia-pec”) ASASSN-15pz. ASASSN-15pz is a spectroscopic “twin” of SN 2009dc, a so-called “Super-Chandrasekhar-mass” SN, throughout its evolution, but it has a peak luminosity
that is
dimmer and comparable to the SN 1991T sub-class of SNe Ia at the luminous end of the normal width-luminosity relation. The synthesized
56
Ni mass of
is also substantially less than that found for several 2009dc-like SNe. Previous well-studied 2009dc-like SNe have generally suffered from large and uncertain amounts of host-galaxy extinction, which is negligible for ASASSN-15pz. Based on the color of ASASSN-15pz, we estimate a host extinction for SN 2009dc of
and confirm its high luminosity (
). The 2009dc-like SN population, which represents ∼1% of SNe Ia, exhibits a range of peak luminosities, and do not fit onto the tight width-luminosity relation. Their optical light curves also show significant diversity of late-time (≳50 days) decline rates. The nebular-phase spectra provide powerful diagnostics to identify the 2009dc-like events as a distinct class of SNe Ia. We suggest referring to these sources using the phenomenology-based “2009dc-like SN Ia-pec” instead of “Super-Chandrasekhar SN Ia,” which is based on an uncertain theoretical interpretation.</description><subject>Astrophysics</subject><subject>Biological evolution</subject><subject>Extinction</subject><subject>Galaxies</subject><subject>Light curve</subject><subject>Luminosity</subject><subject>Phenomenology</subject><subject>Supernova</subject><issn>0004-637X</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNo9kE1Lw0AQhhdRsFbvHhe8GjvJZDdZb6V-FUotRkHwsGw207o1beomLdRfb0LF0zDDw7wvD2OXIdxgGieDUGAaxCiSgckjiXDEev-nY9YDgDiQmLyfsrO6XnZrpFSPfQyzYZZNg1Bsfm75C-3IlG694JlbrN3cWbNu-OyzaqoVNd5Zfud25GvX7LlZVS0XAajCBqX7oms-I7stnfE8mxIfm3N2MjdlTRd_s8_eHu5fR0_B5PlxPBpOAouJatqGYV5IGUtMpYJUFBFClFuFSapyQrAKpCEQliTlUkbKiDAuMCFqYVCIfXZ1-Lvx1feW6kYvq61ft5E6QinSWKQYtxQcKOuruvY01xvvVsbvdQi6U6g7X7rzpQ8K8RcVWGEp</recordid><startdate>20190720</startdate><enddate>20190720</enddate><creator>Chen, Ping</creator><creator>Dong, Subo</creator><creator>Katz, Boaz</creator><creator>Kochanek, C. 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S. ; Kollmeier, Juna A. ; Maguire, K. ; Phillips, M. M. ; Prieto, J. L. ; Shappee, B. J. ; Stritzinger, M. D. ; Bose, Subhash ; Brown, Peter J. ; Holoien, T. W.-S. ; Galbany, L. ; Milne, Peter A. ; Morrell, Nidia ; Piro, Anthony L. ; Stanek, K. Z. ; Thompson, Todd A. ; Young, D. 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R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>ASASSN-15pz: Revealing Significant Photometric Diversity among 2009dc-like, Peculiar SNe Ia</atitle><jtitle>The Astrophysical journal</jtitle><date>2019-07-20</date><risdate>2019</risdate><volume>880</volume><issue>1</issue><spage>35</spage><pages>35-</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><abstract>We report comprehensive multi-wavelength observations of a peculiar Type Ia-like supernova (“SN Ia-pec”) ASASSN-15pz. ASASSN-15pz is a spectroscopic “twin” of SN 2009dc, a so-called “Super-Chandrasekhar-mass” SN, throughout its evolution, but it has a peak luminosity
that is
dimmer and comparable to the SN 1991T sub-class of SNe Ia at the luminous end of the normal width-luminosity relation. The synthesized
56
Ni mass of
is also substantially less than that found for several 2009dc-like SNe. Previous well-studied 2009dc-like SNe have generally suffered from large and uncertain amounts of host-galaxy extinction, which is negligible for ASASSN-15pz. Based on the color of ASASSN-15pz, we estimate a host extinction for SN 2009dc of
and confirm its high luminosity (
). The 2009dc-like SN population, which represents ∼1% of SNe Ia, exhibits a range of peak luminosities, and do not fit onto the tight width-luminosity relation. Their optical light curves also show significant diversity of late-time (≳50 days) decline rates. The nebular-phase spectra provide powerful diagnostics to identify the 2009dc-like events as a distinct class of SNe Ia. We suggest referring to these sources using the phenomenology-based “2009dc-like SN Ia-pec” instead of “Super-Chandrasekhar SN Ia,” which is based on an uncertain theoretical interpretation.</abstract><cop>Philadelphia</cop><pub>IOP Publishing</pub><doi>10.3847/1538-4357/ab2630</doi><orcidid>https://orcid.org/0000-0001-9206-3460</orcidid><orcidid>https://orcid.org/0000-0002-1229-2499</orcidid><orcidid>https://orcid.org/0000-0001-6806-0673</orcidid><orcidid>https://orcid.org/0000-0001-6017-2961</orcidid><orcidid>https://orcid.org/0000-0002-1296-6887</orcidid><orcidid>https://orcid.org/0000-0003-0853-6427</orcidid><orcidid>https://orcid.org/0000-0003-2734-0796</orcidid><orcidid>https://orcid.org/0000-0002-0370-157X</orcidid><orcidid>https://orcid.org/0000-0003-0943-0026</orcidid><orcidid>https://orcid.org/0000-0002-5571-1833</orcidid><orcidid>https://orcid.org/0000-0003-0584-2920</orcidid><orcidid>https://orcid.org/0000-0003-4631-1149</orcidid><orcidid>https://orcid.org/0000-0002-1027-0990</orcidid><orcidid>https://orcid.org/0000-0001-9852-1610</orcidid><orcidid>https://orcid.org/0000-0003-3529-3854</orcidid><orcidid>https://orcid.org/0000-0003-2535-3091</orcidid><orcidid>https://orcid.org/0000-0001-6272-5507</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Astrophysics Biological evolution Extinction Galaxies Light curve Luminosity Phenomenology Supernova |
| title | ASASSN-15pz: Revealing Significant Photometric Diversity among 2009dc-like, Peculiar SNe Ia |
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