Refined Mass and Geometric Measurements of the High-mass PSR J0740+6620
文献类型：期刊论文
| 作者 | Fonseca,E.3,4,5,6; Cromartie,H. T.7; Pennucci,T. T.1,8; Ray,P. S.9; Kirichenko,A. Yu.35,36; Ransom,S. M.8; Demorest,P. B.2; Stairs,I. H.10; Arzoumanian,Z.11; Guillemot,L.12,13 |
| 刊名 | The Astrophysical Journal Letters
 |
| 出版日期 | 2021-07-01 |
| 卷号 | 915期号:1 |
| ISSN号 | 2041-8205 |
| 关键词 | Neutron stars Pulsars General relativity Compact objects Binary pulsars |
| DOI | 10.3847/2041-8213/ac03b8 |
| 英文摘要 | Abstract We report results from continued timing observations of PSR J0740+6620, a high-mass, 2.8 ms radio pulsar in orbit with a likely ultracool white dwarf companion. Our data set consists of combined pulse arrival-time measurements made with the 100 m Green Bank Telescope and the Canadian Hydrogen Intensity Mapping Experiment telescope. We explore the significance of timing-based phenomena arising from general relativistic dynamics and variations in pulse dispersion. When using various statistical methods, we find that combining ～1.5 yr of additional, high-cadence timing data with previous measurements confirms and improves on previous estimates of relativistic effects within the PSR J0740+6620 system, with the pulsar mass m p = 2.08 ? 0.07 + 0.07 M ⊙ (68.3% credibility) determined by the relativistic Shapiro time delay. For the first time, we measure secular variation in the orbital period and argue that this effect arises from apparent acceleration due to significant transverse motion. After incorporating contributions from Galactic differential rotation and off-plane acceleration in the Galactic potential, we obtain a model-dependent distance of d = 1.14 ? 0.15 + 0.17 kpc (68.3% credibility). This improved distance confirms the ultracool nature of the white dwarf companion determined from recent optical observations. We discuss the prospects for future observations with next-generation facilities, which will likely improve the precision on mp for J0740+6620 by an order of magnitude within the next few years. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:2041-8205-915-1-AC03B8 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/56839]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Fonseca,E. |
| 作者单位 | 1.Institute of Physics, E?tv?s Lorán University, Pázmány P.s. 1/A, 1117 Budapest, Hungary 2.National Radio Astronomy Observatory, P.O. Box O, Socorro, NM 87801, USA 3.Department of Physics, McGill University, 3600 rue University, Montréal, QC H3A 2T8, Canada 4.McGill Space Institute, McGill University, 3550 rue University, Montréal, QC H3A 2A7, Canada 5.Department of Physics and Astronomy, West Virginia University, Morgantown, WV 26506-6315, USA 6.Center for Gravitational Waves and Cosmology, Chestnut Ridge Research Building, Morgantown, WV 26505, USA 7.Cornell Center for Astrophysics and Planetary Science and Department of Astronomy, Cornell University, Ithaca, NY 14853, USA 8.National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA 9.U.S. Naval Research Laboratory, Washington, DC 20375, USA 10.Department of Physics & Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, Canada |
| 推荐引用方式 GB/T 7714 | Fonseca,E.,Cromartie,H. T.,Pennucci,T. T.,et al. Refined Mass and Geometric Measurements of the High-mass PSR J0740+6620[J]. The Astrophysical Journal Letters,2021,915(1). |
| APA | Fonseca,E..,Cromartie,H. T..,Pennucci,T. T..,Ray,P. S..,Kirichenko,A. Yu..,...&Zhu,W. W..(2021).Refined Mass and Geometric Measurements of the High-mass PSR J0740+6620.The Astrophysical Journal Letters,915(1). |
| MLA | Fonseca,E.,et al."Refined Mass and Geometric Measurements of the High-mass PSR J0740+6620".The Astrophysical Journal Letters 915.1(2021). |
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