DISCOVERY OF AN ACCRETING MILLISECOND PULSAR IN THE ECLIPSING BINARY SYSTEM SWIFT J1749.4–2807
We report on the discovery and the timing analysis of the first eclipsing accretion-powered millisecond X-ray pulsar (AMXP): SWIFT J1749.4-2807. The neutron star rotates at a frequency of ~517.9 Hz and is in a binary system with an orbital period of 8.8 hr and a projected semimajor axis of ~1.90 lt-...
| Main Authors: | , , , , , , , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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Institute of Physics/American Astronomical Society
2015
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| Online Access: | http://hdl.handle.net/1721.1/95838 |
| _version_ | 1826217259818811392 |
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| author | Altamirano, D. Cavecchi, Y. Patruno, A. Watts, A. Linares, Manuel Alegret Degenaar, N. Kalamkar, M. van der Klis, M. Rea, N. Casella, P. Armas Padilla, M. Kaur, R. Yang, Y. J. Soleri, P. Wijnands, R. |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Altamirano, D. Cavecchi, Y. Patruno, A. Watts, A. Linares, Manuel Alegret Degenaar, N. Kalamkar, M. van der Klis, M. Rea, N. Casella, P. Armas Padilla, M. Kaur, R. Yang, Y. J. Soleri, P. Wijnands, R. |
| author_sort | Altamirano, D. |
| collection | MIT |
| description | We report on the discovery and the timing analysis of the first eclipsing accretion-powered millisecond X-ray pulsar (AMXP): SWIFT J1749.4-2807. The neutron star rotates at a frequency of ~517.9 Hz and is in a binary system with an orbital period of 8.8 hr and a projected semimajor axis of ~1.90 lt-s. Assuming a neutron star between 0.8 and 2.2 M ☉ and using the mass function of the system and the eclipse half-angle, we constrain the mass of the companion and the inclination of the system to be in the ~0.46-0.81 M ☉ and ~ 74fdg4-77fdg3 range, respectively. To date, this is the tightest constraint on the orbital inclination of any AMXP. As in other AMXPs, the pulse profile shows harmonic content up to the third overtone. However, this is the first AMXP to show a first overtone with rms amplitudes between ~6% and ~23%, which is the strongest ever seen and which can be more than two times stronger than the fundamental. The fact that SWIFT J1749.4-2807 is an eclipsing system that shows uncommonly strong harmonic content suggests that it might be the best source to date to set constraints on neutron star properties including compactness and geometry. |
| first_indexed | 2024-09-23T17:00:32Z |
| format | Article |
| id | mit-1721.1/95838 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T17:00:32Z |
| publishDate | 2015 |
| publisher | Institute of Physics/American Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/958382022-10-03T09:46:30Z DISCOVERY OF AN ACCRETING MILLISECOND PULSAR IN THE ECLIPSING BINARY SYSTEM SWIFT J1749.4–2807 Altamirano, D. Cavecchi, Y. Patruno, A. Watts, A. Linares, Manuel Alegret Degenaar, N. Kalamkar, M. van der Klis, M. Rea, N. Casella, P. Armas Padilla, M. Kaur, R. Yang, Y. J. Soleri, P. Wijnands, R. MIT Kavli Institute for Astrophysics and Space Research Linares, Manuel Alegret We report on the discovery and the timing analysis of the first eclipsing accretion-powered millisecond X-ray pulsar (AMXP): SWIFT J1749.4-2807. The neutron star rotates at a frequency of ~517.9 Hz and is in a binary system with an orbital period of 8.8 hr and a projected semimajor axis of ~1.90 lt-s. Assuming a neutron star between 0.8 and 2.2 M ☉ and using the mass function of the system and the eclipse half-angle, we constrain the mass of the companion and the inclination of the system to be in the ~0.46-0.81 M ☉ and ~ 74fdg4-77fdg3 range, respectively. To date, this is the tightest constraint on the orbital inclination of any AMXP. As in other AMXPs, the pulse profile shows harmonic content up to the third overtone. However, this is the first AMXP to show a first overtone with rms amplitudes between ~6% and ~23%, which is the strongest ever seen and which can be more than two times stronger than the fundamental. The fact that SWIFT J1749.4-2807 is an eclipsing system that shows uncommonly strong harmonic content suggests that it might be the best source to date to set constraints on neutron star properties including compactness and geometry. Netherlands Organization for Scientific Research (Veni Fellowship grant) Netherlands Organization for Scientific Research (NWO Rubicon fellowship) 2015-03-05T15:26:14Z 2015-03-05T15:26:14Z 2011-01 2010-05 Article http://purl.org/eprint/type/JournalArticle 2041-8205 2041-8213 http://hdl.handle.net/1721.1/95838 Altamirano, D., Y. Cavecchi, A. Patruno, A. Watts, M. Linares, N. Degenaar, M. Kalamkar, et al. “DISCOVERY OF AN ACCRETING MILLISECOND PULSAR IN THE ECLIPSING BINARY SYSTEM SWIFT J1749.4–2807.” The Astrophysical Journal 727, no. 1 (December 28, 2010): L18. © 2010 American Astronomical Society. en_US http://dx.doi.org/10.1088/2041-8205/727/1/l18 Astrophysical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf Institute of Physics/American Astronomical Society American Astronomical Society |
| spellingShingle | Altamirano, D. Cavecchi, Y. Patruno, A. Watts, A. Linares, Manuel Alegret Degenaar, N. Kalamkar, M. van der Klis, M. Rea, N. Casella, P. Armas Padilla, M. Kaur, R. Yang, Y. J. Soleri, P. Wijnands, R. DISCOVERY OF AN ACCRETING MILLISECOND PULSAR IN THE ECLIPSING BINARY SYSTEM SWIFT J1749.4–2807 |
| title | DISCOVERY OF AN ACCRETING MILLISECOND PULSAR IN THE ECLIPSING BINARY SYSTEM SWIFT J1749.4–2807 |
| title_full | DISCOVERY OF AN ACCRETING MILLISECOND PULSAR IN THE ECLIPSING BINARY SYSTEM SWIFT J1749.4–2807 |
| title_fullStr | DISCOVERY OF AN ACCRETING MILLISECOND PULSAR IN THE ECLIPSING BINARY SYSTEM SWIFT J1749.4–2807 |
| title_full_unstemmed | DISCOVERY OF AN ACCRETING MILLISECOND PULSAR IN THE ECLIPSING BINARY SYSTEM SWIFT J1749.4–2807 |
| title_short | DISCOVERY OF AN ACCRETING MILLISECOND PULSAR IN THE ECLIPSING BINARY SYSTEM SWIFT J1749.4–2807 |
| title_sort | discovery of an accreting millisecond pulsar in the eclipsing binary system swift j1749 4 2807 |
| url | http://hdl.handle.net/1721.1/95838 |
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