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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The runaway binary LP 400-22 is leaving the Galaxy
Monthly Notices of the Royal Astronomical Society, Volume 434, No. 4, Year 2013
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Description
We present optical spectroscopy, astrometry, radio and X-ray observations of the runaway binary LP 400-22. We refine the orbital parameters of the system based on our new radial velocity observations. Our parallax data indicate that LP 400-22 is significantly more distant (3σ lower limit of 840pc) than initially predicted. LP 400-22 has a tangential velocity in excessof 830 km s-1; it is unbound to the Galaxy. Our radio and X-ray observations fail to detect a recycled millisecond pulsar companion, indicating that LP 400-22 is a double white dwarf system. This essentially rules out a supernova runaway ejection mechanism. Based on its orbit, a Galactic Centre origin is also unlikely. However, its orbit intersects the locations of several globular clusters; dynamical interactions between LP 400-22 and other binary stars or a central black hole in a dense cluster could explain the origin of this unusual binary. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Authors & Co-Authors
Kilic, Mukremin
United States, Norman
The University of Oklahoma
Gianninas, Alexandros
United States, Norman
The University of Oklahoma
Brown, Warren R.
United States, Cambridge
Smithsonian Astrophysical Observatory
Harris, Hugh C.
United States, Flagstaff
U.s. Naval Observatory - Flagstaff Station
Agúeros, Marcel A.
United States, New York
Columbia University
Heinke, Craig O.
Canada, Edmonton
University of Alberta
Kenyon, Scott J.
United States, Cambridge
Smithsonian Astrophysical Observatory
Camilo, Fernando
United States, New York
Columbia University
United States, Arecibo
Arecibo Observatory
Statistics
Citations: 11
Authors: 8
Affiliations: 7
Identifiers
Doi:
10.1093/mnras/stt1282
ISSN:
00358711