Optical Spectroscopy and Demographics of Redback Millisecond Pulsar Binaries
We present the first optical spectroscopy of five confirmed (or strong candidate) redback millisecond pulsar binaries, obtaining complete radial velocity curves for each companion star. The properties of these millisecond pulsar binaries with low-mass, hydrogen-rich companions are discussed in the c...
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creator | Strader, Jay Swihart, Samuel Chomiuk, Laura Bahramian, Arash Britt, Chris Cheung, C. C. Dage, Kristen Halpern, Jules Li, Kwan-Lok Mignani, Roberto P. Orosz, Jerome A. Peacock, Mark Salinas, Ricardo Shishkovsky, Laura Tremou, Evangelia |
description | We present the first optical spectroscopy of five confirmed (or strong candidate) redback millisecond pulsar binaries, obtaining complete radial velocity curves for each companion star. The properties of these millisecond pulsar binaries with low-mass, hydrogen-rich companions are discussed in the context of the 14 confirmed and 10 candidate field redbacks. We find that the neutron stars in redbacks have a median mass of 1.78 0.09 M with a dispersion of = 0.21 0.09. Neutron stars with masses in excess of 2 M are consistent with, but not firmly demanded by, current observations. Redback companions have median masses of 0.36 0.04 M with a scatter of = 0.15 0.04 M , and a tail possibly extending up to 0.7-0.9 M . Candidate redbacks tend to have higher companion masses than confirmed redbacks, suggesting a possible selection bias against the detection of radio pulsations in these more massive candidate systems. The distribution of companion masses between redbacks and the less massive black widows continues to be strongly bimodal, which is an important constraint on evolutionary models for these systems. Among redbacks, the median efficiency of converting the pulsar spin-down energy to γ-ray luminosity is ∼10%. |
doi_str_mv | 10.3847/1538-4357/aafbaa |
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C. ; Dage, Kristen ; Halpern, Jules ; Li, Kwan-Lok ; Mignani, Roberto P. ; Orosz, Jerome A. ; Peacock, Mark ; Salinas, Ricardo ; Shishkovsky, Laura ; Tremou, Evangelia</creator><creatorcontrib>Strader, Jay ; Swihart, Samuel ; Chomiuk, Laura ; Bahramian, Arash ; Britt, Chris ; Cheung, C. C. ; Dage, Kristen ; Halpern, Jules ; Li, Kwan-Lok ; Mignani, Roberto P. ; Orosz, Jerome A. ; Peacock, Mark ; Salinas, Ricardo ; Shishkovsky, Laura ; Tremou, Evangelia</creatorcontrib><description>We present the first optical spectroscopy of five confirmed (or strong candidate) redback millisecond pulsar binaries, obtaining complete radial velocity curves for each companion star. The properties of these millisecond pulsar binaries with low-mass, hydrogen-rich companions are discussed in the context of the 14 confirmed and 10 candidate field redbacks. We find that the neutron stars in redbacks have a median mass of 1.78 0.09 M with a dispersion of = 0.21 0.09. Neutron stars with masses in excess of 2 M are consistent with, but not firmly demanded by, current observations. Redback companions have median masses of 0.36 0.04 M with a scatter of = 0.15 0.04 M , and a tail possibly extending up to 0.7-0.9 M . Candidate redbacks tend to have higher companion masses than confirmed redbacks, suggesting a possible selection bias against the detection of radio pulsations in these more massive candidate systems. The distribution of companion masses between redbacks and the less massive black widows continues to be strongly bimodal, which is an important constraint on evolutionary models for these systems. Among redbacks, the median efficiency of converting the pulsar spin-down energy to γ-ray luminosity is ∼10%.</description><identifier>ISSN: 0004-637X</identifier><identifier>EISSN: 1538-4357</identifier><identifier>DOI: 10.3847/1538-4357/aafbaa</identifier><language>eng</language><publisher>Philadelphia: The American Astronomical Society</publisher><subject>Astrophysics ; binaries: spectroscopic ; Companion stars ; Constraint modelling ; Energy conversion efficiency ; gamma rays: stars ; Hydrogen ; Luminosity ; Millisecond pulsars ; Neutron stars ; Neutrons ; Physics ; Pulsars ; pulsars: general ; Radial velocity ; Spectroscopy ; Spectrum analysis ; stars: neutron ; X-rays: binaries</subject><ispartof>The Astrophysical journal, 2019-02, Vol.872 (1), p.42</ispartof><rights>2019. The American Astronomical Society. All rights reserved.</rights><rights>Copyright IOP Publishing Feb 10, 2019</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c479t-2f7e8534e6767fc9d54623b04b38ee260027022e81ead8e669352f6f7d16f8233</citedby><cites>FETCH-LOGICAL-c479t-2f7e8534e6767fc9d54623b04b38ee260027022e81ead8e669352f6f7d16f8233</cites><orcidid>0000-0001-9767-8499 ; 0000-0002-4377-0174 ; 0000-0002-8685-583X ; 0000-0001-9647-2886 ; 0000-0002-8400-3705 ; 0000-0003-2506-6041 ; 0000-0002-1206-1930 ; 0000-0003-1699-8867 ; 0000-0002-0439-7047 ; 0000-0002-4039-6703 ; 0000-0003-4814-2377 ; 0000-0002-8532-4025 ; 0000-0002-1468-9668</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://iopscience.iop.org/article/10.3847/1538-4357/aafbaa/pdf$$EPDF$$P50$$Giop$$H</linktopdf><link.rule.ids>230,314,776,780,881,27901,27902,38867,53842</link.rule.ids><linktorsrc>$$Uhttps://iopscience.iop.org/article/10.3847/1538-4357/aafbaa$$EView_record_in_IOP_Publishing$$FView_record_in_$$GIOP_Publishing</linktorsrc><backlink>$$Uhttps://hal.science/hal-01974759$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Strader, Jay</creatorcontrib><creatorcontrib>Swihart, Samuel</creatorcontrib><creatorcontrib>Chomiuk, Laura</creatorcontrib><creatorcontrib>Bahramian, Arash</creatorcontrib><creatorcontrib>Britt, Chris</creatorcontrib><creatorcontrib>Cheung, C. C.</creatorcontrib><creatorcontrib>Dage, Kristen</creatorcontrib><creatorcontrib>Halpern, Jules</creatorcontrib><creatorcontrib>Li, Kwan-Lok</creatorcontrib><creatorcontrib>Mignani, Roberto P.</creatorcontrib><creatorcontrib>Orosz, Jerome A.</creatorcontrib><creatorcontrib>Peacock, Mark</creatorcontrib><creatorcontrib>Salinas, Ricardo</creatorcontrib><creatorcontrib>Shishkovsky, Laura</creatorcontrib><creatorcontrib>Tremou, Evangelia</creatorcontrib><title>Optical Spectroscopy and Demographics of Redback Millisecond Pulsar Binaries</title><title>The Astrophysical journal</title><addtitle>APJ</addtitle><addtitle>Astrophys. J</addtitle><description>We present the first optical spectroscopy of five confirmed (or strong candidate) redback millisecond pulsar binaries, obtaining complete radial velocity curves for each companion star. The properties of these millisecond pulsar binaries with low-mass, hydrogen-rich companions are discussed in the context of the 14 confirmed and 10 candidate field redbacks. We find that the neutron stars in redbacks have a median mass of 1.78 0.09 M with a dispersion of = 0.21 0.09. Neutron stars with masses in excess of 2 M are consistent with, but not firmly demanded by, current observations. Redback companions have median masses of 0.36 0.04 M with a scatter of = 0.15 0.04 M , and a tail possibly extending up to 0.7-0.9 M . Candidate redbacks tend to have higher companion masses than confirmed redbacks, suggesting a possible selection bias against the detection of radio pulsations in these more massive candidate systems. The distribution of companion masses between redbacks and the less massive black widows continues to be strongly bimodal, which is an important constraint on evolutionary models for these systems. 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C.</au><au>Dage, Kristen</au><au>Halpern, Jules</au><au>Li, Kwan-Lok</au><au>Mignani, Roberto P.</au><au>Orosz, Jerome A.</au><au>Peacock, Mark</au><au>Salinas, Ricardo</au><au>Shishkovsky, Laura</au><au>Tremou, Evangelia</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Optical Spectroscopy and Demographics of Redback Millisecond Pulsar Binaries</atitle><jtitle>The Astrophysical journal</jtitle><stitle>APJ</stitle><addtitle>Astrophys. J</addtitle><date>2019-02-10</date><risdate>2019</risdate><volume>872</volume><issue>1</issue><spage>42</spage><pages>42-</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><abstract>We present the first optical spectroscopy of five confirmed (or strong candidate) redback millisecond pulsar binaries, obtaining complete radial velocity curves for each companion star. The properties of these millisecond pulsar binaries with low-mass, hydrogen-rich companions are discussed in the context of the 14 confirmed and 10 candidate field redbacks. We find that the neutron stars in redbacks have a median mass of 1.78 0.09 M with a dispersion of = 0.21 0.09. Neutron stars with masses in excess of 2 M are consistent with, but not firmly demanded by, current observations. Redback companions have median masses of 0.36 0.04 M with a scatter of = 0.15 0.04 M , and a tail possibly extending up to 0.7-0.9 M . Candidate redbacks tend to have higher companion masses than confirmed redbacks, suggesting a possible selection bias against the detection of radio pulsations in these more massive candidate systems. The distribution of companion masses between redbacks and the less massive black widows continues to be strongly bimodal, which is an important constraint on evolutionary models for these systems. 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subjects | Astrophysics binaries: spectroscopic Companion stars Constraint modelling Energy conversion efficiency gamma rays: stars Hydrogen Luminosity Millisecond pulsars Neutron stars Neutrons Physics Pulsars pulsars: general Radial velocity Spectroscopy Spectrum analysis stars: neutron X-rays: binaries |
title | Optical Spectroscopy and Demographics of Redback Millisecond Pulsar Binaries |
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