<?xml version="1.0" encoding="utf-8"?>
<TEI xmlns="http://www.tei-c.org/ns/1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:hal="http://hal.archives-ouvertes.fr/" xmlns:gml="http://www.opengis.net/gml/3.3/" xmlns:gmlce="http://www.opengis.net/gml/3.3/ce" version="1.1" xsi:schemaLocation="http://www.tei-c.org/ns/1.0 http://api.archives-ouvertes.fr/documents/aofr-sword.xsd">
  <teiHeader>
    <fileDesc>
      <titleStmt>
        <title>HAL TEI export of hal-02116534</title>
      </titleStmt>
      <publicationStmt>
        <distributor>CCSD</distributor>
        <availability status="restricted">
          <licence target="https://creativecommons.org/publicdomain/zero/1.0/">CC0 1.0 - Universal</licence>
        </availability>
        <date when="2026-05-02T15:09:02+02:00"/>
      </publicationStmt>
      <sourceDesc>
        <p part="N">HAL API Platform</p>
      </sourceDesc>
    </fileDesc>
  </teiHeader>
  <text>
    <body>
      <listBibl>
        <biblFull>
          <titleStmt>
            <title xml:lang="en">A Galactic centre gravitational-wave Messenger</title>
            <author role="aut">
              <persName>
                <forename type="first">Marek</forename>
                <surname>Abramowicz</surname>
              </persName>
              <idno type="halauthorid">1025277-0</idno>
            </author>
            <author role="aut">
              <persName>
                <forename type="first">Michał</forename>
                <surname>Bejger</surname>
              </persName>
              <email type="md5">a07b99330e9d3f891a265159f2401d99</email>
              <email type="domain">camk.edu.pl</email>
              <idno type="idhal" notation="numeric">829665</idno>
              <idno type="halauthorid" notation="string">1342348-829665</idno>
              <idno type="ORCID">https://orcid.org/0000-0002-4991-8213</idno>
              <affiliation ref="#struct-1004962"/>
            </author>
            <author role="aut">
              <persName>
                <forename type="first">Éric</forename>
                <surname>Gourgoulhon</surname>
              </persName>
              <idno type="halauthorid">2267804-0</idno>
              <affiliation ref="#struct-157"/>
            </author>
            <author role="aut">
              <persName>
                <forename type="first">Odele</forename>
                <surname>Straub</surname>
              </persName>
              <idno type="halauthorid">995831-0</idno>
              <affiliation ref="#struct-541774"/>
            </author>
            <editor role="depositor">
              <persName>
                <forename>INSPIRE</forename>
                <surname>HEP</surname>
              </persName>
              <email type="md5">95ce79cc22af4b1c280b8573813d3d1e</email>
              <email type="domain">cern.ch</email>
            </editor>
          </titleStmt>
          <editionStmt>
            <edition n="v1" type="current">
              <date type="whenSubmitted">2021-12-11 09:53:27</date>
              <date type="whenModified">2025-07-28 11:07:08</date>
              <date type="whenReleased">2021-12-11 09:53:28</date>
              <date type="whenProduced">2020</date>
              <date type="whenEndEmbargoed">2021-12-11</date>
              <ref type="file" target="https://hal.science/hal-02116534v1/document">
                <date notBefore="2021-12-11"/>
              </ref>
              <ref type="file" subtype="greenPublisher" n="1" target="https://hal.science/hal-02116534v1/file/s41598-020-63206-1.pdf" id="file-3475702-3048762">
                <date notBefore="2021-12-11"/>
              </ref>
              <ref type="externalLink" target="http://arxiv.org/pdf/1903.10698"/>
            </edition>
            <respStmt>
              <resp>contributor</resp>
              <name key="519949">
                <persName>
                  <forename>INSPIRE</forename>
                  <surname>HEP</surname>
                </persName>
                <email type="md5">95ce79cc22af4b1c280b8573813d3d1e</email>
                <email type="domain">cern.ch</email>
              </name>
            </respStmt>
          </editionStmt>
          <publicationStmt>
            <distributor>CCSD</distributor>
            <idno type="halId">hal-02116534</idno>
            <idno type="halUri">https://hal.science/hal-02116534</idno>
            <idno type="halBibtex">abramowicz:hal-02116534</idno>
            <idno type="halRefHtml">&lt;i&gt;Scientific Reports&lt;/i&gt;, 2020, 10 (1), pp.7054. &lt;a target="_blank" href="https://dx.doi.org/10.1038/s41598-020-63206-1"&gt;&amp;#x27E8;10.1038/s41598-020-63206-1&amp;#x27E9;&lt;/a&gt;</idno>
            <idno type="halRef">Scientific Reports, 2020, 10 (1), pp.7054. &amp;#x27E8;10.1038/s41598-020-63206-1&amp;#x27E9;</idno>
            <availability status="restricted">
              <licence target="https://creativecommons.org/licenses/by/4.0/">CC BY 4.0 - Attribution<ref corresp="#file-3475702-3048762"/></licence>
            </availability>
          </publicationStmt>
          <seriesStmt>
            <idno type="stamp" n="IN2P3">Institut National de Physique Nucléaire et de Physique des Particules</idno>
            <idno type="stamp" n="OBSPM">Observatoire de Paris</idno>
            <idno type="stamp" n="CEA">CEA - Commissariat à l'énergie atomique</idno>
            <idno type="stamp" n="INSU">INSU - Institut National des Sciences de l'Univers</idno>
            <idno type="stamp" n="APC">AstroParticule et Cosmologie</idno>
            <idno type="stamp" n="CNRS">CNRS - Centre national de la recherche scientifique</idno>
            <idno type="stamp" n="LUTH">Laboratoire Univers et Théories</idno>
            <idno type="stamp" n="LESIA" corresp="SORBONNE-UNIVERSITE">Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique</idno>
            <idno type="stamp" n="DSV" corresp="CEA">Direction de la recherche fondamentale - sciences du vivant</idno>
            <idno type="stamp" n="PSL">Université Paris sciences et lettres</idno>
            <idno type="stamp" n="CEA-DRF" corresp="CEA">Direction de Recherche Fondamentale</idno>
            <idno type="stamp" n="SORBONNE-UNIVERSITE">Sorbonne Université</idno>
            <idno type="stamp" n="SORBONNE-UNIV" corresp="SORBONNE-UNIVERSITE">Sorbonne Université 01/01/2018</idno>
            <idno type="stamp" n="SU-SCIENCES" corresp="SORBONNE-UNIVERSITE">Faculté des Sciences de Sorbonne Université</idno>
            <idno type="stamp" n="UNIV-PARIS">Université Paris Cité</idno>
            <idno type="stamp" n="UNIVERSITE-PARIS" corresp="UNIV-PARIS">Université Paris Cité</idno>
            <idno type="stamp" n="UP-SCIENCES">Université Paris Cité - Faculté des Sciences</idno>
            <idno type="stamp" n="TEST-HALCNRS">Collection test HAL CNRS</idno>
            <idno type="stamp" n="OBSPM-PSL" corresp="PSL">Observatoire de Paris - PSL</idno>
            <idno type="stamp" n="SU-TI">Sorbonne Université - Texte Intégral</idno>
            <idno type="stamp" n="ALLIANCE-SU"> Alliance Sorbonne Université</idno>
            <idno type="stamp" n="SUPRA_ASTRO_PHYS">Astronomie, astrophysique et physique des plasmas</idno>
            <idno type="stamp" n="LIRA-OBS">Laboratoire d’Instrumentation et de Recherche en Astrophysique</idno>
          </seriesStmt>
          <notesStmt>
            <note type="audience" n="2">International</note>
            <note type="popular" n="0">No</note>
            <note type="peer" n="1">Yes</note>
          </notesStmt>
          <sourceDesc>
            <biblStruct>
              <analytic>
                <title xml:lang="en">A Galactic centre gravitational-wave Messenger</title>
                <author role="aut">
                  <persName>
                    <forename type="first">Marek</forename>
                    <surname>Abramowicz</surname>
                  </persName>
                  <idno type="halauthorid">1025277-0</idno>
                </author>
                <author role="aut">
                  <persName>
                    <forename type="first">Michał</forename>
                    <surname>Bejger</surname>
                  </persName>
                  <email type="md5">a07b99330e9d3f891a265159f2401d99</email>
                  <email type="domain">camk.edu.pl</email>
                  <idno type="idhal" notation="numeric">829665</idno>
                  <idno type="halauthorid" notation="string">1342348-829665</idno>
                  <idno type="ORCID">https://orcid.org/0000-0002-4991-8213</idno>
                  <affiliation ref="#struct-1004962"/>
                </author>
                <author role="aut">
                  <persName>
                    <forename type="first">Éric</forename>
                    <surname>Gourgoulhon</surname>
                  </persName>
                  <idno type="halauthorid">2267804-0</idno>
                  <affiliation ref="#struct-157"/>
                </author>
                <author role="aut">
                  <persName>
                    <forename type="first">Odele</forename>
                    <surname>Straub</surname>
                  </persName>
                  <idno type="halauthorid">995831-0</idno>
                  <affiliation ref="#struct-541774"/>
                </author>
              </analytic>
              <monogr>
                <idno type="halJournalId" status="VALID">89181</idno>
                <idno type="issn">2045-2322</idno>
                <idno type="eissn">2045-2322</idno>
                <title level="j">Scientific Reports</title>
                <imprint>
                  <publisher>Nature Publishing Group</publisher>
                  <biblScope unit="volume">10</biblScope>
                  <biblScope unit="issue">1</biblScope>
                  <biblScope unit="pp">7054</biblScope>
                  <date type="datePub">2020</date>
                </imprint>
              </monogr>
              <idno type="arxiv">1903.10698</idno>
              <idno type="doi">10.1038/s41598-020-63206-1</idno>
              <idno type="inspire">1726806</idno>
            </biblStruct>
          </sourceDesc>
          <profileDesc>
            <langUsage>
              <language ident="en">English</language>
            </langUsage>
            <textClass>
              <classCode scheme="halDomain" n="phys.astr">Physics [physics]/Astrophysics [astro-ph]</classCode>
              <classCode scheme="halDomain" n="phys.phys.phys-ins-det">Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]</classCode>
              <classCode scheme="halDomain" n="sdu.astr">Sciences of the Universe [physics]/Astrophysics [astro-ph]</classCode>
              <classCode scheme="halTypology" n="ART">Journal articles</classCode>
              <classCode scheme="halOldTypology" n="ART">Journal articles</classCode>
              <classCode scheme="halTreeTypology" n="ART">Journal articles</classCode>
            </textClass>
            <abstract xml:lang="en">
              <p>Our existence in the Universe resulted from a rare combination of circumstances. The same must hold for any highly developed extraterrestrial civilisation, and if they have ever existed in the Milky Way, they would likely be scattered over large distances in space and time. However, all technologically advanced species must be aware of the unique property of the galactic centre: it hosts Sagittarius A* (Sgr A*), the closest supermassive black hole to anyone in the Galaxy. A civilisation with sufficient technical know-how may have placed material in orbit around Sgr A* for research, energy extraction, and communication purposes. In either case, its orbital motion will necessarily be a source of gravitational waves. We show that a Jupiter-mass probe on the retrograde innermost stable circular orbit around Sgr A* emits, depending on the black hole spin, at a frequency of f$_{GW}$ = 0.63–1.07 mHz and with a power of P$_{GW}$ = 2.7 × 10$^{36}$–2.0 × 10$^{37}$ erg/s. We discuss that the energy output of a single star is sufficient to stabilise the location of an orbiting probe for a billion years against gravitational wave induced orbital decay. Placing and sustaining a device near Sgr A* is therefore astrophysically possible. Such a probe will emit an unambiguously artificial continuous gravitational wave signal that is observable with LISA-type detectors.</p>
            </abstract>
          </profileDesc>
        </biblFull>
      </listBibl>
    </body>
    <back>
      <listOrg type="structures">
        <org type="laboratory" xml:id="struct-1004962" status="VALID">
          <idno type="IdRef">18177688X</idno>
          <idno type="RNSR">200512546V</idno>
          <idno type="ROR">https://ror.org/03tnjrr49</idno>
          <orgName>AstroParticule et Cosmologie</orgName>
          <orgName type="acronym">APC (UMR_7164)</orgName>
          <date type="start">2020-01-01</date>
          <desc>
            <address>
              <addrLine>APC - UMR 7164, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, case postale 7020, F-75205 Paris Cedex 13</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">https://apc.u-paris.fr/</ref>
          </desc>
          <listRelation>
            <relation name="DRF/IRFU" active="#struct-300016" type="direct"/>
            <relation active="#struct-300046" type="direct"/>
            <relation active="#struct-300055" type="direct"/>
            <relation name="UAR2201" active="#struct-441569" type="direct"/>
            <relation active="#struct-564132" type="indirect"/>
            <relation name="UMR7164" active="#struct-441569" type="direct"/>
            <relation name="UMR_7164" active="#struct-557826" type="direct"/>
          </listRelation>
        </org>
        <org type="laboratory" xml:id="struct-157" status="OLD">
          <idno type="IdRef">139486976</idno>
          <idno type="RNSR">200212760R</idno>
          <orgName>Laboratoire Univers et Théories</orgName>
          <orgName type="acronym">LUTH (UMR_8102)</orgName>
          <date type="end">2019-12-31</date>
          <desc>
            <address>
              <addrLine>5 place Jules Janssen 92195 Meudon cedex</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">http://luth.obspm.fr/</ref>
          </desc>
          <listRelation>
            <relation active="#struct-300045" type="direct"/>
            <relation active="#struct-300055" type="direct"/>
            <relation name="UAR2201" active="#struct-441569" type="direct"/>
            <relation active="#struct-564132" type="indirect"/>
            <relation name="UMR_8102" active="#struct-300301" type="direct"/>
            <relation name="UMR_8102" active="#struct-441569" type="direct"/>
          </listRelation>
        </org>
        <org type="laboratory" xml:id="struct-541774" status="OLD">
          <idno type="IdRef">170794016</idno>
          <idno type="RNSR">200212766X</idno>
          <orgName>Laboratoire d'études spatiales et d'instrumentation en astrophysique</orgName>
          <orgName type="acronym">LESIA (UMR_8109)</orgName>
          <date type="end">2019-12-31</date>
          <desc>
            <address>
              <addrLine>5, place Jules Janssen 92190 MEUDON</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">http://lesia.obspm.fr/</ref>
          </desc>
          <listRelation>
            <relation active="#struct-300045" type="direct"/>
            <relation active="#struct-300055" type="direct"/>
            <relation name="UAR2201" active="#struct-441569" type="direct"/>
            <relation active="#struct-564132" type="indirect"/>
            <relation name="UMR_8109" active="#struct-300301" type="direct"/>
            <relation active="#struct-413221" type="direct"/>
            <relation name="UMR8109" active="#struct-441569" type="direct"/>
          </listRelation>
        </org>
        <org type="institution" xml:id="struct-300016" status="VALID">
          <idno type="IdRef">026372061</idno>
          <idno type="ISNI">0000000122998025</idno>
          <idno type="ROR">https://ror.org/00jjx8s55</idno>
          <idno type="Wikidata">Q868550</idno>
          <orgName>Commissariat à l'énergie atomique et aux énergies alternatives</orgName>
          <orgName type="acronym">CEA</orgName>
          <desc>
            <address>
              <addrLine>Centre de SaclayCentre de GrenobleCentre de Cadaracheetc</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">http://www.cea.fr/</ref>
          </desc>
        </org>
        <org type="institution" xml:id="struct-300046" status="VALID">
          <idno type="IdRef">028227875</idno>
          <idno type="ISNI">0000000106643574</idno>
          <idno type="ROR">https://ror.org/03fd77x13</idno>
          <orgName>Institut National de Physique Nucléaire et de Physique des Particules du CNRS</orgName>
          <orgName type="acronym">IN2P3</orgName>
          <desc>
            <address>
              <addrLine>CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE3 rue Michel-Ange75794 PARIS CEDEX 16 - France</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">https://in2p3.cnrs.fr</ref>
          </desc>
        </org>
        <org type="institution" xml:id="struct-300055" status="VALID">
          <idno type="IdRef">026550520</idno>
          <idno type="ISNI">000000040475642X</idno>
          <idno type="RNSR">200610854B</idno>
          <idno type="ROR">https://ror.org/029nkcm90</idno>
          <idno type="Wikidata">Q461340</idno>
          <orgName>Observatoire de Paris</orgName>
          <desc>
            <address>
              <addrLine>61 Av de l'Observatoire 75014 PARIS</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">http://www.obspm.fr</ref>
          </desc>
          <listRelation>
            <relation name="UAR2201" active="#struct-441569" type="direct"/>
            <relation active="#struct-564132" type="direct"/>
          </listRelation>
        </org>
        <org type="regroupinstitution" xml:id="struct-441569" status="VALID">
          <idno type="IdRef">02636817X</idno>
          <idno type="ISNI">0000000122597504</idno>
          <idno type="ROR">https://ror.org/02feahw73</idno>
          <orgName>Centre National de la Recherche Scientifique</orgName>
          <orgName type="acronym">CNRS</orgName>
          <date type="start">1939-10-19</date>
          <desc>
            <address>
              <country key="FR"/>
            </address>
            <ref type="url">https://www.cnrs.fr/</ref>
          </desc>
        </org>
        <org type="regroupinstitution" xml:id="struct-564132" status="VALID">
          <idno type="IdRef">241597595</idno>
          <idno type="ISNI">0000 0004 1784 3645</idno>
          <idno type="ROR">https://ror.org/013cjyk83</idno>
          <orgName>Université Paris Sciences et Lettres</orgName>
          <orgName type="acronym">PSL</orgName>
          <desc>
            <address>
              <addrLine>60 rue Mazarine 75006 Paris</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">https://www.psl.eu/</ref>
          </desc>
        </org>
        <org type="institution" xml:id="struct-557826" status="VALID">
          <idno type="IdRef">236453505</idno>
          <idno type="ISNI">0000 0004 7885 7602</idno>
          <idno type="ROR">https://ror.org/05f82e368</idno>
          <orgName>Université Paris Cité</orgName>
          <orgName type="acronym">UPCité</orgName>
          <date type="start">2020-01-01</date>
          <desc>
            <address>
              <addrLine>85 boulevard Saint-Germain75006 Paris</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">https://u-paris.fr/</ref>
          </desc>
        </org>
        <org type="institution" xml:id="struct-300045" status="VALID">
          <idno type="IdRef">029349265</idno>
          <idno type="ISNI">0000 0001 2154 1736</idno>
          <idno type="ROR">https://ror.org/04kdfz702</idno>
          <idno type="Wikidata">Q3152437</idno>
          <orgName>Institut national des sciences de l'Univers</orgName>
          <orgName type="acronym">INSU - CNRS</orgName>
          <date type="start">2007-04-19</date>
          <desc>
            <address>
              <addrLine>INSU-CNRS3 rue Michel-Ange, 75794 Paris Cedex 16</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">https://www.insu.cnrs.fr</ref>
          </desc>
        </org>
        <org type="institution" xml:id="struct-300301" status="OLD">
          <idno type="IdRef">027542084</idno>
          <idno type="ISNI">0000000121514068</idno>
          <idno type="ROR">https://ror.org/02n7qrg46</idno>
          <orgName>Université Paris Diderot - Paris 7</orgName>
          <orgName type="acronym">UPD7</orgName>
          <date type="end">2019-12-31</date>
          <desc>
            <address>
              <addrLine>5 rue Thomas-Mann - 75205 Paris cedex 13</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">http://www.univ-paris-diderot.fr</ref>
          </desc>
        </org>
        <org type="regroupinstitution" xml:id="struct-413221" status="VALID">
          <idno type="IdRef">221333754</idno>
          <idno type="ROR">https://ror.org/02en5vm52</idno>
          <orgName>Sorbonne Université</orgName>
          <orgName type="acronym">SU</orgName>
          <date type="start">2018-01-01</date>
          <desc>
            <address>
              <addrLine>21 rue de l’École de médecine - 75006 Paris</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">http://www.sorbonne-universite.fr/</ref>
          </desc>
        </org>
      </listOrg>
    </back>
  </text>
</TEI>