Searching for companions to four millisecond pulsars with the Gran
Telescopio Canarias
A. Yu. Kirichenko1,2,
A. V. Karpova2,
D. A. Zyuzin2,
S. V. Zharikov1,
E. A. López3,
Yu. A. Shibanov2,
P. C. C. Freire4,
E. Fonseca5,
A. Cabrera Lavers6,7
1Instituto de Astronomía, Universidad Nacional Autónoma de
México, México, Apdo. Postal 877, Baja California,
México, 22800
2Ioffe Institute, Politekhnicheskaya 26, Saint Petersburg,
194021, Russia
3Instituto de Investigación en Ciencias Físicas y Matemáticas,
USAC, Ciudad Universitaria, Zona 12, Guatemala
4Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69,
D-53131 Bonn, Germany
5Department of Physics & McGill Space Institute, McGill University,
3600 University Street, Montreal, QC, H3A 2T8, Canada
6Instituto de Astrofísica de Canarias, , Vía Láctea s/n, E38200,
La Laguna, Tenerife, Spain
7GRANTECAN, Cuesta de San José s/n, E-38712, Breña Baja, La
Palma, Spain
We performed observations of four binary millisecond pulsars with the
Gran Telescopio Canarias. For three of them, J1630+3734, J1741+1351 and
J2042+0246, we detected optical companions which have magnitudes r'=
24.4, 24.4 and 24.0, respectively. We also set a lower limit on the
magnitude of the J0557+1550 companion (r'>25.6). Comparison of the
observational data with white dwarf cooling models shows that all
detected sources can be cool low-mass white dwarfs.
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