The ultracool helium-atmosphere white dwarf companion of PSR J0740+6620?

Bibcode
2019MNRAS.485.3715B
DOI
10.1093/mnras/stz607
Beronya, D. M.; Karpova, A. V.; Kirichenko, A. Yu; Zharikov, S. V.; Zyuzin, D. A.; Shibanov, Yu A.; Cabrera-Lavers, A.
Referencia bibliográfica

Monthly Notices of the Royal Astronomical Society, Volume 485, Issue 3, p.3715-3720

Fecha de publicación:
5
2019
Revista
Monthly Notices of the Royal Astronomical Society
Número de autores
7
Número de autores del IAC
1
Número de citas
14
Número de citas referidas
13
Descripción
We report detection of the likely companion of the binary millisecond pulsar (MSP) J0740+6620 with the Gran Telescopio Canarias in the r' and i' bands. The position of the detected starlike source coincides with the pulsar coordinates within the 1σ uncertainty of ≈0.2 arcsec. Its magnitudes are r' = 26.51 ± 0.17 and i' = 25.49 ± 0.15. Comparing the data with the white dwarf (WD) cooling tracks suggests that it can be an ultracool helium-atmosphere WD with the temperature ≲3500 K and cooling age ≳5 Gyr. The age is consistent with the pulsar characteristic age corrected for kinematic effects. This is the reddest source among known WD companions of MSPs. Detection of the source in other bands would be useful to clarify its properties and nature.
Proyectos relacionados
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Morfología y dinámica de la Vía Láctea
El Proyecto se estructura en dos partes, diferenciadas pero complementarias: morfología y dinámica. El estudio detallado de la morfología de la Vía Láctea pretende proveer una base de datos de distribución estelar en las regiones más alejadas y extintas de nuestra Galaxia, mediante el desarrollo de modelos semiempíricos a partir de la información
Martín
López Corredoira
En ejecución
Tipo
Con árbitro
La Vía Láctea y el Grupo Local (MWLG)
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