Partly burnt runaway stellar remnants from peculiar thermonuclear supernovae
Abstract We report the discovery of three stars that, along with the prototype LP 40−365, form a distinct class of chemically peculiar runaway stars that are the survivors of thermonuclear explosions. Spectroscopy of the four confirmed LP 40−365 stars finds ONe-dominated atmospheres enriched with re...
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Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2019-10, Vol.489 (2), p.1489-1508 |
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creator | Raddi, R Hollands, M A Koester, D Hermes, J J Gänsicke, B T Heber, U Shen, K J Townsley, D M Pala, A F Reding, J S Toloza, O F Pelisoli, I Geier, S Gentile Fusillo, N P Munari, U Strader, J |
description | Abstract
We report the discovery of three stars that, along with the prototype LP 40−365, form a distinct class of chemically peculiar runaway stars that are the survivors of thermonuclear explosions. Spectroscopy of the four confirmed LP 40−365 stars finds ONe-dominated atmospheres enriched with remarkably similar amounts of nuclear ashes of partial O- and Si-burning. Kinematic evidence is consistent with ejection from a binary supernova progenitor; at least two stars have rest-frame velocities indicating they are unbound to the Galaxy. With masses and radii ranging between 0.20 and 0.28 M$\odot$ and between 0.16 and 0.60 R$\odot$, respectively, we speculate these inflated white dwarfs are the partly burnt remnants of either peculiar Type Iax or electron-capture supernovae. Adopting supernova rates from the literature, we estimate that ∼20 LP 40−365 stars brighter than 19 mag should be detectable within 2 kpc from the Sun at the end of the Gaia mission. We suggest that as they cool, these stars will evolve in their spectroscopic appearance, and eventually become peculiar O-rich white dwarfs. Finally, we stress that the discovery of new LP 40−365 stars will be useful to further constrain their evolution, supplying key boundary conditions to the modelling of explosion mechanisms, supernova rates, and nucleosynthetic yields of peculiar thermonuclear explosions. |
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We report the discovery of three stars that, along with the prototype LP 40−365, form a distinct class of chemically peculiar runaway stars that are the survivors of thermonuclear explosions. Spectroscopy of the four confirmed LP 40−365 stars finds ONe-dominated atmospheres enriched with remarkably similar amounts of nuclear ashes of partial O- and Si-burning. Kinematic evidence is consistent with ejection from a binary supernova progenitor; at least two stars have rest-frame velocities indicating they are unbound to the Galaxy. With masses and radii ranging between 0.20 and 0.28 M$\odot$ and between 0.16 and 0.60 R$\odot$, respectively, we speculate these inflated white dwarfs are the partly burnt remnants of either peculiar Type Iax or electron-capture supernovae. Adopting supernova rates from the literature, we estimate that ∼20 LP 40−365 stars brighter than 19 mag should be detectable within 2 kpc from the Sun at the end of the Gaia mission. We suggest that as they cool, these stars will evolve in their spectroscopic appearance, and eventually become peculiar O-rich white dwarfs. Finally, we stress that the discovery of new LP 40−365 stars will be useful to further constrain their evolution, supplying key boundary conditions to the modelling of explosion mechanisms, supernova rates, and nucleosynthetic yields of peculiar thermonuclear explosions.</description><identifier>ISSN: 0035-8711</identifier><identifier>EISSN: 1365-2966</identifier><identifier>DOI: 10.1093/mnras/stz1618</identifier><language>eng</language><publisher>United Kingdom: Oxford University Press</publisher><ispartof>Monthly notices of the Royal Astronomical Society, 2019-10, Vol.489 (2), p.1489-1508</ispartof><rights>2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society 2019</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c402t-fae026f10bd4b276dad4b23e66c5adcea2504e417de2af1700ad5ea4d1446c993</citedby><cites>FETCH-LOGICAL-c402t-fae026f10bd4b276dad4b23e66c5adcea2504e417de2af1700ad5ea4d1446c993</cites><orcidid>0000-0003-4615-6556 ; 0000-0001-6805-9664 ; 0000-0002-9090-9191 ; 0000-0001-7069-7403 ; 0000000170697403 ; 0000000290909191 ; 0000000346156556 ; 0000000168059664</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,315,782,786,887,1606,27933,27934</link.rule.ids><linktorsrc>$$Uhttps://dx.doi.org/10.1093/mnras/stz1618$$EView_record_in_Oxford_University_Press$$FView_record_in_$$GOxford_University_Press</linktorsrc><backlink>$$Uhttps://www.osti.gov/biblio/1560907$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Raddi, R</creatorcontrib><creatorcontrib>Hollands, M A</creatorcontrib><creatorcontrib>Koester, D</creatorcontrib><creatorcontrib>Hermes, J J</creatorcontrib><creatorcontrib>Gänsicke, B T</creatorcontrib><creatorcontrib>Heber, U</creatorcontrib><creatorcontrib>Shen, K J</creatorcontrib><creatorcontrib>Townsley, D M</creatorcontrib><creatorcontrib>Pala, A F</creatorcontrib><creatorcontrib>Reding, J S</creatorcontrib><creatorcontrib>Toloza, O F</creatorcontrib><creatorcontrib>Pelisoli, I</creatorcontrib><creatorcontrib>Geier, S</creatorcontrib><creatorcontrib>Gentile Fusillo, N P</creatorcontrib><creatorcontrib>Munari, U</creatorcontrib><creatorcontrib>Strader, J</creatorcontrib><title>Partly burnt runaway stellar remnants from peculiar thermonuclear supernovae</title><title>Monthly notices of the Royal Astronomical Society</title><description>Abstract
We report the discovery of three stars that, along with the prototype LP 40−365, form a distinct class of chemically peculiar runaway stars that are the survivors of thermonuclear explosions. Spectroscopy of the four confirmed LP 40−365 stars finds ONe-dominated atmospheres enriched with remarkably similar amounts of nuclear ashes of partial O- and Si-burning. Kinematic evidence is consistent with ejection from a binary supernova progenitor; at least two stars have rest-frame velocities indicating they are unbound to the Galaxy. With masses and radii ranging between 0.20 and 0.28 M$\odot$ and between 0.16 and 0.60 R$\odot$, respectively, we speculate these inflated white dwarfs are the partly burnt remnants of either peculiar Type Iax or electron-capture supernovae. Adopting supernova rates from the literature, we estimate that ∼20 LP 40−365 stars brighter than 19 mag should be detectable within 2 kpc from the Sun at the end of the Gaia mission. We suggest that as they cool, these stars will evolve in their spectroscopic appearance, and eventually become peculiar O-rich white dwarfs. Finally, we stress that the discovery of new LP 40−365 stars will be useful to further constrain their evolution, supplying key boundary conditions to the modelling of explosion mechanisms, supernova rates, and nucleosynthetic yields of peculiar thermonuclear explosions.</description><issn>0035-8711</issn><issn>1365-2966</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNqFkD1PwzAURS0EEqUwskdMLKHvOY7TjKjiS6oEA8zWq_OiBiVOZDug8utJaXemq3t1dIcjxDXCHUKZLTrnKSxC_EGNyxMxw0znqSy1PhUzgCxPlwXiubgI4RMAVCb1TKzfyMd2l2xG72LiR0fftEtC5LYln3juHLkYktr3XTKwHdtmmuOWfde70bY8tTAO7F3_RXwpzmpqA18dcy4-Hh_eV8_p-vXpZXW_Tq0CGdOaGKSuETaV2shCV7TPjLW2OVWWSeagWGFRsaQaCwCqciZVoVLalmU2FzeH3z7ExgTbRLZb2zvHNhrMNZRQTFB6gKzvQ_Bcm8E3HfmdQTB7X-bPlzn6mvjb4-k4_IP-AvQfcF0</recordid><startdate>20191021</startdate><enddate>20191021</enddate><creator>Raddi, R</creator><creator>Hollands, M A</creator><creator>Koester, D</creator><creator>Hermes, J J</creator><creator>Gänsicke, B T</creator><creator>Heber, U</creator><creator>Shen, K J</creator><creator>Townsley, D M</creator><creator>Pala, A F</creator><creator>Reding, J S</creator><creator>Toloza, O F</creator><creator>Pelisoli, I</creator><creator>Geier, S</creator><creator>Gentile Fusillo, N P</creator><creator>Munari, U</creator><creator>Strader, J</creator><general>Oxford University Press</general><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope><orcidid>https://orcid.org/0000-0003-4615-6556</orcidid><orcidid>https://orcid.org/0000-0001-6805-9664</orcidid><orcidid>https://orcid.org/0000-0002-9090-9191</orcidid><orcidid>https://orcid.org/0000-0001-7069-7403</orcidid><orcidid>https://orcid.org/0000000170697403</orcidid><orcidid>https://orcid.org/0000000290909191</orcidid><orcidid>https://orcid.org/0000000346156556</orcidid><orcidid>https://orcid.org/0000000168059664</orcidid></search><sort><creationdate>20191021</creationdate><title>Partly burnt runaway stellar remnants from peculiar thermonuclear supernovae</title><author>Raddi, R ; Hollands, M A ; Koester, D ; Hermes, J J ; Gänsicke, B T ; Heber, U ; Shen, K J ; Townsley, D M ; Pala, A F ; Reding, J S ; Toloza, O F ; Pelisoli, I ; Geier, S ; Gentile Fusillo, N P ; Munari, U ; Strader, J</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c402t-fae026f10bd4b276dad4b23e66c5adcea2504e417de2af1700ad5ea4d1446c993</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Raddi, R</creatorcontrib><creatorcontrib>Hollands, M A</creatorcontrib><creatorcontrib>Koester, D</creatorcontrib><creatorcontrib>Hermes, J J</creatorcontrib><creatorcontrib>Gänsicke, B T</creatorcontrib><creatorcontrib>Heber, U</creatorcontrib><creatorcontrib>Shen, K J</creatorcontrib><creatorcontrib>Townsley, D M</creatorcontrib><creatorcontrib>Pala, A F</creatorcontrib><creatorcontrib>Reding, J S</creatorcontrib><creatorcontrib>Toloza, O F</creatorcontrib><creatorcontrib>Pelisoli, I</creatorcontrib><creatorcontrib>Geier, S</creatorcontrib><creatorcontrib>Gentile Fusillo, N P</creatorcontrib><creatorcontrib>Munari, U</creatorcontrib><creatorcontrib>Strader, J</creatorcontrib><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Monthly notices of the Royal Astronomical Society</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Raddi, R</au><au>Hollands, M A</au><au>Koester, D</au><au>Hermes, J J</au><au>Gänsicke, B T</au><au>Heber, U</au><au>Shen, K J</au><au>Townsley, D M</au><au>Pala, A F</au><au>Reding, J S</au><au>Toloza, O F</au><au>Pelisoli, I</au><au>Geier, S</au><au>Gentile Fusillo, N P</au><au>Munari, U</au><au>Strader, J</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Partly burnt runaway stellar remnants from peculiar thermonuclear supernovae</atitle><jtitle>Monthly notices of the Royal Astronomical Society</jtitle><date>2019-10-21</date><risdate>2019</risdate><volume>489</volume><issue>2</issue><spage>1489</spage><epage>1508</epage><pages>1489-1508</pages><issn>0035-8711</issn><eissn>1365-2966</eissn><abstract>Abstract
We report the discovery of three stars that, along with the prototype LP 40−365, form a distinct class of chemically peculiar runaway stars that are the survivors of thermonuclear explosions. Spectroscopy of the four confirmed LP 40−365 stars finds ONe-dominated atmospheres enriched with remarkably similar amounts of nuclear ashes of partial O- and Si-burning. Kinematic evidence is consistent with ejection from a binary supernova progenitor; at least two stars have rest-frame velocities indicating they are unbound to the Galaxy. With masses and radii ranging between 0.20 and 0.28 M$\odot$ and between 0.16 and 0.60 R$\odot$, respectively, we speculate these inflated white dwarfs are the partly burnt remnants of either peculiar Type Iax or electron-capture supernovae. Adopting supernova rates from the literature, we estimate that ∼20 LP 40−365 stars brighter than 19 mag should be detectable within 2 kpc from the Sun at the end of the Gaia mission. We suggest that as they cool, these stars will evolve in their spectroscopic appearance, and eventually become peculiar O-rich white dwarfs. Finally, we stress that the discovery of new LP 40−365 stars will be useful to further constrain their evolution, supplying key boundary conditions to the modelling of explosion mechanisms, supernova rates, and nucleosynthetic yields of peculiar thermonuclear explosions.</abstract><cop>United Kingdom</cop><pub>Oxford University Press</pub><doi>10.1093/mnras/stz1618</doi><tpages>20</tpages><orcidid>https://orcid.org/0000-0003-4615-6556</orcidid><orcidid>https://orcid.org/0000-0001-6805-9664</orcidid><orcidid>https://orcid.org/0000-0002-9090-9191</orcidid><orcidid>https://orcid.org/0000-0001-7069-7403</orcidid><orcidid>https://orcid.org/0000000170697403</orcidid><orcidid>https://orcid.org/0000000290909191</orcidid><orcidid>https://orcid.org/0000000346156556</orcidid><orcidid>https://orcid.org/0000000168059664</orcidid><oa>free_for_read</oa></addata></record> |
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title | Partly burnt runaway stellar remnants from peculiar thermonuclear supernovae |
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