Discovery of a proto-white dwarf with a massive unseen companion
We report the discovery of SDSS~J022932.28+713002.7, a nascent extremely low-mass (ELM) white dwarf (WD) orbiting a massive (\(> 1\,M_\odot\) at 2\(\sigma\) confidence) companion with a period of 36 hours. We use a combination of spectroscopy, including data from the ongoing SDSS-V survey, and ph...
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creator | Pallathadka, Gautham Adamane Chandra, Vedant Zakamska, Nadia L Hwang, Hsiang-Chih Zenati, Yossef Hermes, J J El-Badry, Kareem Gaensicke, Boris T Morrison, Sean Crumpler, Nicole R Arseneau, Stefan |
description | We report the discovery of SDSS~J022932.28+713002.7, a nascent extremely low-mass (ELM) white dwarf (WD) orbiting a massive (\(> 1\,M_\odot\) at 2\(\sigma\) confidence) companion with a period of 36 hours. We use a combination of spectroscopy, including data from the ongoing SDSS-V survey, and photometry to measure the stellar parameters for the primary pre-ELM white dwarf. The lightcurve of the primary WD exhibits ellipsoidal variation, which we combine with radial velocity data and \(\tt{PHOEBE}\) binary simulations to estimate the mass of the invisible companion. We find that the primary WD has mass \(M_1\) = \(0.18^{+0.02}_{-0.02}\) M\(_\odot\) and the unseen secondary has mass \(M_2\) = \(1.19^{+0.21}_{-0.14}\) M\(_\odot\). The mass of the companion suggests that it is most likely a near-Chandrasekhar mass white dwarf or a neutron star. It is likely that the system recently went through a Roche lobe overflow from the visible primary onto the invisible secondary. The dynamical configuration of the binary is consistent with the theoretical evolutionary tracks for such objects, and the primary is currently in its contraction phase. The measured orbital period puts this system on a stable evolutionary path which, within a few Gyrs, will lead to a contracted ELM white dwarf orbiting a massive compact companion. |
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We use a combination of spectroscopy, including data from the ongoing SDSS-V survey, and photometry to measure the stellar parameters for the primary pre-ELM white dwarf. The lightcurve of the primary WD exhibits ellipsoidal variation, which we combine with radial velocity data and \(\tt{PHOEBE}\) binary simulations to estimate the mass of the invisible companion. We find that the primary WD has mass \(M_1\) = \(0.18^{+0.02}_{-0.02}\) M\(_\odot\) and the unseen secondary has mass \(M_2\) = \(1.19^{+0.21}_{-0.14}\) M\(_\odot\). The mass of the companion suggests that it is most likely a near-Chandrasekhar mass white dwarf or a neutron star. It is likely that the system recently went through a Roche lobe overflow from the visible primary onto the invisible secondary. The dynamical configuration of the binary is consistent with the theoretical evolutionary tracks for such objects, and the primary is currently in its contraction phase. 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We use a combination of spectroscopy, including data from the ongoing SDSS-V survey, and photometry to measure the stellar parameters for the primary pre-ELM white dwarf. The lightcurve of the primary WD exhibits ellipsoidal variation, which we combine with radial velocity data and \(\tt{PHOEBE}\) binary simulations to estimate the mass of the invisible companion. We find that the primary WD has mass \(M_1\) = \(0.18^{+0.02}_{-0.02}\) M\(_\odot\) and the unseen secondary has mass \(M_2\) = \(1.19^{+0.21}_{-0.14}\) M\(_\odot\). The mass of the companion suggests that it is most likely a near-Chandrasekhar mass white dwarf or a neutron star. It is likely that the system recently went through a Roche lobe overflow from the visible primary onto the invisible secondary. The dynamical configuration of the binary is consistent with the theoretical evolutionary tracks for such objects, and the primary is currently in its contraction phase. The measured orbital period puts this system on a stable evolutionary path which, within a few Gyrs, will lead to a contracted ELM white dwarf orbiting a massive compact companion.</description><subject>Binary stars</subject><subject>Neutron stars</subject><subject>Orbits</subject><subject>Radial velocity</subject><subject>Tracks (paths)</subject><subject>White dwarf stars</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2023</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNqNjE0KwjAQRoMgWLR3GHBdSCetdin4gwdwX0Kd0hSb1Eza4u3NwgP4Nt_ifbyVSFCpPKsKxI1ImXspJR6OWJYqEaeL4cbN5D_gWtAwehdctnQmEDwX7VtYTOiiGDSzmQkmy0QWGjeM2hpnd2Ld6hdT-tut2N-uj_M9i6X3RBzq3k3eRlVjVWEeUVL99_oCOdk5Bg</recordid><startdate>20231025</startdate><enddate>20231025</enddate><creator>Pallathadka, Gautham Adamane</creator><creator>Chandra, Vedant</creator><creator>Zakamska, Nadia L</creator><creator>Hwang, Hsiang-Chih</creator><creator>Zenati, Yossef</creator><creator>Hermes, J J</creator><creator>El-Badry, Kareem</creator><creator>Gaensicke, Boris T</creator><creator>Morrison, Sean</creator><creator>Crumpler, Nicole R</creator><creator>Arseneau, Stefan</creator><general>Cornell University Library, arXiv.org</general><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M7S</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope></search><sort><creationdate>20231025</creationdate><title>Discovery of a proto-white dwarf with a massive unseen companion</title><author>Pallathadka, Gautham Adamane ; Chandra, Vedant ; Zakamska, Nadia L ; Hwang, Hsiang-Chih ; Zenati, Yossef ; Hermes, J J ; El-Badry, Kareem ; Gaensicke, Boris T ; Morrison, Sean ; Crumpler, Nicole R ; Arseneau, Stefan</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-proquest_journals_28821111303</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2023</creationdate><topic>Binary stars</topic><topic>Neutron stars</topic><topic>Orbits</topic><topic>Radial velocity</topic><topic>Tracks (paths)</topic><topic>White dwarf stars</topic><toplevel>online_resources</toplevel><creatorcontrib>Pallathadka, Gautham Adamane</creatorcontrib><creatorcontrib>Chandra, Vedant</creatorcontrib><creatorcontrib>Zakamska, Nadia L</creatorcontrib><creatorcontrib>Hwang, Hsiang-Chih</creatorcontrib><creatorcontrib>Zenati, Yossef</creatorcontrib><creatorcontrib>Hermes, J J</creatorcontrib><creatorcontrib>El-Badry, Kareem</creatorcontrib><creatorcontrib>Gaensicke, Boris T</creatorcontrib><creatorcontrib>Morrison, Sean</creatorcontrib><creatorcontrib>Crumpler, Nicole R</creatorcontrib><creatorcontrib>Arseneau, Stefan</creatorcontrib><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Pallathadka, Gautham Adamane</au><au>Chandra, Vedant</au><au>Zakamska, Nadia L</au><au>Hwang, Hsiang-Chih</au><au>Zenati, Yossef</au><au>Hermes, J J</au><au>El-Badry, Kareem</au><au>Gaensicke, Boris T</au><au>Morrison, Sean</au><au>Crumpler, Nicole R</au><au>Arseneau, Stefan</au><format>book</format><genre>document</genre><ristype>GEN</ristype><atitle>Discovery of a proto-white dwarf with a massive unseen companion</atitle><jtitle>arXiv.org</jtitle><date>2023-10-25</date><risdate>2023</risdate><eissn>2331-8422</eissn><abstract>We report the discovery of SDSS~J022932.28+713002.7, a nascent extremely low-mass (ELM) white dwarf (WD) orbiting a massive (\(> 1\,M_\odot\) at 2\(\sigma\) confidence) companion with a period of 36 hours. We use a combination of spectroscopy, including data from the ongoing SDSS-V survey, and photometry to measure the stellar parameters for the primary pre-ELM white dwarf. The lightcurve of the primary WD exhibits ellipsoidal variation, which we combine with radial velocity data and \(\tt{PHOEBE}\) binary simulations to estimate the mass of the invisible companion. We find that the primary WD has mass \(M_1\) = \(0.18^{+0.02}_{-0.02}\) M\(_\odot\) and the unseen secondary has mass \(M_2\) = \(1.19^{+0.21}_{-0.14}\) M\(_\odot\). The mass of the companion suggests that it is most likely a near-Chandrasekhar mass white dwarf or a neutron star. It is likely that the system recently went through a Roche lobe overflow from the visible primary onto the invisible secondary. The dynamical configuration of the binary is consistent with the theoretical evolutionary tracks for such objects, and the primary is currently in its contraction phase. The measured orbital period puts this system on a stable evolutionary path which, within a few Gyrs, will lead to a contracted ELM white dwarf orbiting a massive compact companion.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><oa>free_for_read</oa></addata></record> |
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subjects | Binary stars Neutron stars Orbits Radial velocity Tracks (paths) White dwarf stars |
title | Discovery of a proto-white dwarf with a massive unseen companion |
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