Bibcode
González-Hernández, J. I.; Rebolo, R.; Casares, J.
Bibliographical reference
The Astrophysical Journal Letters, Volume 744, Issue 2, article id. L25 (2012).
Advertised on:
1
2012
Citations
39
Refereed citations
37
Description
We report the detection of an orbital period decay of dot{P}=-1.83+/-
0.66 ms yr-1 in the black hole X-ray binary XTE
J1118+480. This corresponds to a period change of -0.85 ±
0.30 μs per orbital cycle, which is ~150 times larger than expected
from the emission of gravitational waves. These observations cannot be
reproduced by conventional models of magnetic braking even when
including significant mass loss from the system. The spiral-in of the
star is either driven by magnetic braking under extremely high magnetic
fields in the secondary star or by a currently unknown process, which
will have an impact on the evolution and lifetime of black hole X-ray
binaries.
Based on observations made with the Gran Telescopio Canarias (GTC),
installed in the Spanish Observatorio del Roque de los Muchachos of the
Instituto de Astrofísica de Canarias, in the island of La Palma.
Related projects
Black holes, neutron stars, white dwarfs and their local environment
Accreting black-holes and neutron stars in X-ray binaries provide an ideal laboratory for exploring the physics of compact objects, yielding not only confirmation of the existence of stellar mass black holes via dynamical mass measurements, but also the best opportunity for probing high-gravity environments and the physics of accretion; the most
Montserrat
Armas Padilla