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# GW170817: Measurements of Neutron Star Radii and Equation of State.

On 17 August 2017, the LIGO and Virgo observatories made the first direct detection of gravitational waves from the coalescence of a neutron star binary system. The detection of this gravitational-wave signal, GW170817, offers a novel opportunity to directly probe the properties of matter at the ext... Full description

 Journal Title: Physical review letters October 19, 2018, Vol.121(16), p.161101 Main Author: Abbott, B P Other Authors: Abbott, R , Abbott, T D , Acernese, F , Ackley, K , Adams, C , Adams, T , Addesso, P , Adhikari, R X , Adya, V B , Affeldt, C , Agarwal, B , Agathos, M , Agatsuma, K , Aggarwal, N , Aguiar, O D , Aiello, L , Ain, A , Ajith, P , Allen Format: Electronic Article Language: English Subjects: ID: E-ISSN: 1079-7114 ; DOI: 10.1103/PhysRevLett.121.161101 Link: http://search.proquest.com/docview/2129538214/?pq-origsite=primo Zum Text:
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 recordid: proquest2129538214 title: GW170817: Measurements of Neutron Star Radii and Equation of State. format: Article creator: Abbott, B P Abbott, R Abbott, T D Acernese, F Ackley, K Adams, C Adams, T Addesso, P Adhikari, R X Adya, V B Affeldt, C Agarwal, B Agathos, M Agatsuma, K Aggarwal, N Aguiar, O D Aiello, L Ain, A Ajith, P Allen subjects: General Relativity And Quantum Cosmology Astrophysics - High Energy Astrophysical Phenomena ispartof: Physical review letters, October 19, 2018, Vol.121(16), p.161101 description: On 17 August 2017, the LIGO and Virgo observatories made the first direct detection of gravitational waves from the coalescence of a neutron star binary system. The detection of this gravitational-wave signal, GW170817, offers a novel opportunity to directly probe the properties of matter at the extreme conditions found in the interior of these stars. The initial, minimal-assumption analysis of the LIGO and Virgo data placed constraints on the tidal effects of the coalescing bodies, which were then translated to constraints on neutron star radii. Here, we expand upon previous analyses by working under the hypothesis that both bodies were neutron stars that are described by the same equation of state and have spins within the range observed in Galactic binary neutron stars. Our analysis employs two methods: the use of equation-of-state-insensitive relations between various macroscopic properties of the neutron stars and the use of an efficient parametrization of the defining function $p(\rho)$ of the equation of state itself. From the LIGO and Virgo data alone and the first method, we measure the two neutron star radii as $R_1=10.8^{+2.0}_{-1.7}$ km for the heavier star and $R_2= 10.7^{+2.1}_{-1.5}$ km for the lighter star at the 90% credible level. If we additionally require that the equation of state supports neutron stars with masses larger than $1.97 \,M_\odot$ as required from electromagnetic observations and employ the equation-of-state parametrization, we further constrain $R_1= 11.9^{+1.4}_{-1.4}$ km and $R_2= 11.9^{+1.4}_{-1.4}$ km at the 90% credible level. Finally, we obtain constraints on $p(\rho)$ at supranuclear densities, with pressure at twice nuclear saturation density measured at $3.5^{+2.7}_{-1.7}\times 10^{34} \,\mathrm{dyn}/\mathrm{cm}^{2}$ at the 90% level. Comment: 10 pages, 3 figures; v2 matches published version; data associated with the figures can be found at https://dcc.ligo.org/LIGO-P1800115/public language: eng source: identifier: E-ISSN: 1079-7114 ; DOI: 10.1103/PhysRevLett.121.161101 fulltext: fulltext issn: 10797114 1079-7114 url: Link

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titleGW170817: Measurements of Neutron Star Radii and Equation of State.
creatorAbbott, B P ; Abbott, R ; Abbott, T D ; Acernese, F ; Ackley, K ; Adams, C ; Adams, T ; Addesso, P ; Adhikari, R X ; Adya, V B ; Affeldt, C ; Agarwal, B ; Agathos, M ; Agatsuma, K ; Aggarwal, N ; Aguiar, O D ; Aiello, L ; Ain, A ; Ajith, P ; Allen
ispartofPhysical review letters, October 19, 2018, Vol.121(16), p.161101
identifierE-ISSN: 1079-7114 ; DOI: 10.1103/PhysRevLett.121.161101
languageeng
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descriptionOn 17 August 2017, the LIGO and Virgo observatories made the first direct detection of gravitational waves from the coalescence of a neutron star binary system. The detection of this gravitational-wave signal, GW170817, offers a novel opportunity to directly probe the properties of matter at the extreme conditions found in the interior of these stars. The initial, minimal-assumption analysis of the LIGO and Virgo data placed constraints on the tidal effects of the coalescing bodies, which were then translated to constraints on neutron star radii. Here, we expand upon previous analyses by working under the hypothesis that both bodies were neutron stars that are described by the same equation of state and have spins within the range observed in Galactic binary neutron stars. Our analysis employs two methods: the use of equation-of-state-insensitive relations between various macroscopic properties of the neutron stars and the use of an efficient parametrization of the defining function $p(\rho)$ of the equation of state itself. From the LIGO and Virgo data alone and the first method, we measure the two neutron star radii as $R_1=10.8^{+2.0}_{-1.7}$ km for the heavier star and $R_2= 10.7^{+2.1}_{-1.5}$ km for the lighter star at the 90% credible level. If we additionally require that the equation of state supports neutron stars with masses larger than $1.97 \,M_\odot$ as required from electromagnetic observations and employ the equation-of-state parametrization, we further constrain $R_1= 11.9^{+1.4}_{-1.4}$ km and $R_2= 11.9^{+1.4}_{-1.4}$ km at the 90% credible level. Finally, we obtain constraints on $p(\rho)$ at supranuclear densities, with pressure at twice nuclear saturation density measured at $3.5^{+2.7}_{-1.7}\times 10^{34} \,\mathrm{dyn}/\mathrm{cm}^{2}$ at the 90% level. Comment: 10 pages, 3 figures; v2 matches published version; data associated with the figures can be found at https://dcc.ligo.org/LIGO-P1800115/public
subjectGeneral Relativity And Quantum Cosmology ; Astrophysics - High Energy Astrophysical Phenomena;
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 0 Abbott, B P 1 Abbott, R 2 Abbott, T D 3 Acernese, F 4 Ackley, K 5 Adams, C 6 Adams, T 7 Addesso, P 8 Adhikari, R X 9 Adya, V B 10 Affeldt, C 11 Agarwal, B 12 Agathos, M 13 Agatsuma, K 14 Aggarwal, N 15 Aguiar, O D 16 Aiello, L 17 Ain, A 18 Ajith, P 19 Allen, B 20 Allen, G 21 Allocca, A 22 Aloy, M A 23 Altin, P A 24 Amato, A 25 Ananyeva, A 26 Anderson, S B 27 Anderson, W G 28 Angelova, S V 29 Antier, S 30 Appert, S 31 Arai, K 32 Araya, M C 33 Areeda, J S 34 Arène, M 35 Arnaud, N 36 Arun, K G 37 Ascenzi, S 38 Ashton, G 39 Ast, M 40 Aston, S M 41 Astone, P 42 Atallah, D V 43 Aubin, F 44 Aufmuth, P 45 Aulbert, C 46 Aultoneal, K 47 Austin, C 48 Avila-Alvarez, A 49 Babak, S 50 Bacon, P 51 Badaracco, F 52 Bader, M K M 53 Bae, S 54 Baker, P T 55 Baldaccini, F 56 Ballardin, G 57 Ballmer, S W 58 Banagiri, S 59 Barayoga, J C 60 Barclay, S E 61 Barish, B C 62 Barker, D 63 Barkett, K 64 Barnum, S 65 Barone, F 66 Barr, B 67 Barsotti, L 68 Barsuglia, M 69 Barta, D 70 Bartlett, J 71 Bartos, I 72 Bassiri, R 73 Basti, A 74 Batch, J C 75 Bawaj, M 76 Bayley, J C 77 Bazzan, M 78 Bécsy, B 79 Beer, C 80 Bejger, M 81 Belahcene, I 82 Bell, A S 83 Beniwal, D 84 Bensch, M 85 Berger, B K 86 Bergmann, G 87 Bernuzzi, S 88 Bero, J J 89 Berry, C P L 90 Bersanetti, D 91 Bertolini, A 92 Betzwieser, J 93 Bhandare, R 94 Bilenko, I A 95 Bilgili, S A 96 Billingsley, G 97 Billman, C R 98 Birch, J 99 Birney, R 100 ...
titleGW170817: Measurements of Neutron Star Radii and Equation of State.
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 title GW170817: Measurements of Neutron Star Radii and Equation of State. author Abbott, B P ; Abbott, R ; Abbott, T D ; Acernese, F ; Ackley, K ; Adams, C ; Adams, T ; Addesso, P ; Adhikari, R X ; Adya, V B ; Affeldt, C ; Agarwal, B ; Agathos, M ; Agatsuma, K ; Aggarwal, N ; Aguiar, O D ; Aiello, L ; Ain, A ; Ajith, P ; Allen creationdate 20181019 lso01 20181019
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 0 Abbott, B P 1 Abbott, R 2 Abbott, T D 3 Acernese, F 4 Ackley, K 5 Adams, C 6 Adams, T 7 Addesso, P 8 Adhikari, R X 9 Adya, V B 10 Affeldt, C 11 Agarwal, B 12 Agathos, M 13 Agatsuma, K 14 Aggarwal, N 15 Aguiar, O D 16 Aiello, L 17 Ain, A 18 Ajith, P 19 Allen, B 20 Allen, G 21 Allocca, A 22 Aloy, M A 23 Altin, P A 24 Amato, A 25 Ananyeva, A 26 Anderson, S B 27 Anderson, W G 28 Angelova, S V 29 Antier, S 30 Appert, S 31 Arai, K 32 Araya, M C 33 Areeda, J S 34 Arène, M 35 Arnaud, N 36 Arun, K G 37 Ascenzi, S 38 Ashton, G 39 Ast, M 40 Aston, S M 41 Astone, P 42 Atallah, D V 43 Aubin, F 44 Aufmuth, P 45 Aulbert, C 46 Aultoneal, K 47 Austin, C 48 Avila-Alvarez, A 49 Babak, S 50 Bacon, P 51 Badaracco, F 52 Bader, M K M 53 Bae, S 54 Baker, P T 55 Baldaccini, F 56 Ballardin, G 57 Ballmer, S W 58 Banagiri, S 59 Barayoga, J C 60 Barclay, S E 61 Barish, B C 62 Barker, D 63 Barkett, K 64 Barnum, S 65 Barone, F 66 Barr, B 67 Barsotti, L 68 Barsuglia, M 69 Barta, D 70 Bartlett, J 71 Bartos, I 72 Bassiri, R 73 Basti, A 74 Batch, J C 75 Bawaj, M 76 Bayley, J C 77 Bazzan, M 78 Bécsy, B 79 Beer, C 80 Bejger, M 81 Belahcene, I 82 Bell, A S 83 Beniwal, D 84 Bensch, M 85 Berger, B K 86 Bergmann, G 87 Bernuzzi, S 88 Bero, J J 89 Berry, C P L 90 Bersanetti, D 91 Bertolini, A 92 Betzwieser, J 93 Bhandare, R 94 Bilenko, I A 95 Bilgili, S A 96 Billingsley, G 97 Billman, C R 98 Birch, J 99 Birney, R 100 ...
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 0 Abbott, B P 1 Abbott, R 2 Abbott, T D 3 Acernese, F 4 Ackley, K 5 Adams, C 6 Adams, T 7 Addesso, P 8 Adhikari, R X 9 Adya, V B 10 Affeldt, C 11 Agarwal, B 12 Agathos, M 13 Agatsuma, K 14 Aggarwal, N 15 Aguiar, O D 16 Aiello, L 17 Ain, A 18 Ajith, P 19 Allen, B 20 Allen, G 21 Allocca, A 22 Aloy, M A 23 Altin, P A 24 Amato, A 25 Ananyeva, A 26 Anderson, S B 27 Anderson, W G 28 Angelova, S V 29 Antier, S 30 Appert, S 31 Arai, K 32 Araya, M C 33 Areeda, J S 34 Arène, M 35 Arnaud, N 36 Arun, K G 37 Ascenzi, S 38 Ashton, G 39 Ast, M 40 Aston, S M 41 Astone, P 42 Atallah, D V 43 Aubin, F 44 Aufmuth, P 45 Aulbert, C 46 Aultoneal, K 47 Austin, C 48 Avila-Alvarez, A 49 Babak, S 50 Bacon, P 51 Badaracco, F 52 Bader, M K M 53 Bae, S 54 Baker, P T 55 Baldaccini, F 56 Ballardin, G 57 Ballmer, S W 58 Banagiri, S 59 Barayoga, J C 60 Barclay, S E 61 Barish, B C 62 Barker, D 63 Barkett, K 64 Barnum, S 65 Barone, F 66 Barr, B 67 Barsotti, L 68 Barsuglia, M 69 Barta, D 70 Bartlett, J 71 Bartos, I 72 Bassiri, R 73 Basti, A 74 Batch, J C 75 Bawaj, M 76 Bayley, J C 77 Bazzan, M 78 Bécsy, B 79 Beer, C 80 Bejger, M 81 Belahcene, I 82 Bell, A S 83 Beniwal, D 84 Bensch, M 85 Berger, B K 86 Bergmann, G 87 Bernuzzi, S 88 Bero, J J 89 Berry, C P L 90 Bersanetti, D 91 Bertolini, A 92 Betzwieser, J 93 Bhandare, R 94 Bilenko, I A 95 Bilgili, S A 96 Billingsley, G 97 Billman, C R 98 Birch, J 99 Birney, R 100 ...
atitleGW170817: Measurements of Neutron Star Radii and Equation of State.
jtitlePhysical review letters
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volume121
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doi10.1103/PhysRevLett.121.161101
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date2018-10-19