期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 756, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/756/2/L25
关键词
astrometry; pulsars: general; pulsars: individual (J1023+0038); techniques: interferometric
资金
- Netherlands Foundation for Scientific Research (NWO)
- NRAO Jansky Fellowship
- NWO Veni Fellowship
- NSF [AST-1008213]
- NSERC Discovery Grant
- Canada Foundation for Innovation
- NSERC Discovery Grant, from FQRNT via le Centre de Recherche Astrophysique du Quebec
- Canadian Institute for Advanced Research
- STFC [ST/J001562/1, ST/G002487/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J001562/1, ST/G002487/1] Funding Source: researchfish
The recently discovered transitional millisecond pulsar system J1023+0038 exposes a crucial evolutionary phase of recycled neutron stars for multiwavelength study. The system, comprising the neutron star itself, its stellar companion, and the surrounding medium, is visible across the electromagnetic spectrum from the radio to X-ray/gamma-ray regimes and offers insight into the recycling phase of millisecond pulsar evolution. Here, we report on multiple-epoch astrometric observations with the Very Long Baseline Array (VLBA) which give a system parallax of 0.731 +/- 0.022 milliarcseconds (mas) and a proper motion of 17.98 +/- 0.05 mas yr(-1). By combining our results with previous optical observations, we are able to use the parallax distance of 1368(-39)(+42) pc to estimate the mass of the pulsar to be 1.71 +/- 0.16 M-circle dot, and we are also able to measure the three-dimensional space velocity of the system to be 126 +/- 5 km s(-1). Despite the precise nature of the VLBA measurements, the remaining similar to 3% distance uncertainty dominates the 0.16 M-circle dot error on our mass estimate.
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