OY Carinae

A blue band light curve for OY Carinae, adapted from Khruzina1 et al. (2003).[1] The main plot shows the full light curve, and the inset shows the minimum with an expanded horizontal scale.
Observation data
Epoch J2000      Equinox J2000
Constellation Carina
Right ascension 10h 06m 22.07s
Declination −70° 14′ 04.6″
Apparent magnitude (V) +12.2
Characteristics
Spectral type DA / M6V
Astrometry
Radial velocity (Rv)120 km/s
Distance277.1 ly
(85[2] pc)
Details
Mass≈0.7[2]/0.07[3] M☉
Radius0.011[2]/0.127[3] R☉
Luminosity0.0055/0.00117 L☉
Temperature15,000/3,000 K
Orbit
Period (P)0.000172 yr
Semi-major axis (a)0.00213 AU
Eccentricity (e)0.0
Inclination (i)83.3°
Other designations
OY Car, RX J1006.5-7014, SON 6302, 2MASS J10062206-7014045, SBC9 600, AAVSO 1004-69
Database references
SIMBADdata

OY Carinae (abbreviated OY Car) is an eclipsing binary system approximately 277 light-years away from the Sun, classed as a cataclysmic variable. The system comprises an eclipsing white dwarf and red dwarf that orbit each other every 1.51 hours, and possibly a yet unconfirmed third low-mass (substellar?) companion.

Planetary system?

Greenhill et al. (2009) would invoke the presence of a third object to explain orbital period variations with an apparent periodicity of roughly 35 years. The third body could yield a minimum mass 7 times greater than Jupiter and be located 9.5 astronomical units away from the cataclysmic variable system,[4] being likely either a massive planetary object or else a very low-mass brown dwarf. It is likely that the apparent change is due to solar cycle type magnetic activity in the secondary star. Large irregular deviations from the general trend, with time-scales of years, also occur. Further observations will be able to confirm or disprove the presence of a substellar companion.

Diagram of the probable structure of the OY Carinae Star System.
The OY Carinae planetary system[4]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(years)		 Eccentricity Inclination Radius
b (unconfirmed) ≥7 MJ 9.5 35±3.5  ? — —

See also

References

  1. ↑ Khruzina, T. S.; Cherepashchuk, A. M.; Bisikalo, D. V..; Boyarchuk, A. A.; Kuznetsov, O. A. (March 2003). "Interpretation of Light Curves of the Cataclysmic Variable OY Car in a Model with Shockless Interaction between a Gaseous Stream and the Disk". Astronomy Reports. 47 (3): 214–231. Bibcode:2003ARep...47..214K. doi:10.1134/1.1562216. S2CID 119896879. Retrieved 19 November 2021.
  2. 1 2 3 Mauche & Raymond (2000). "The EUV Emission-Line spectrum of OY Carinae in superoutburst: scattering in the wind" (PDF). Revista Mexicana de Astronomía y Astrofísica, Serie de Conferencias. 9: 232–233. Bibcode:2000RMxAC...9..232M.
  3. 1 2 Wood; Horne, Keith; Berriman, Graham; Wade, Richard A. (1989). "Eclipse studies of the dwarf nova OY Carinae in quiescence". Astrophysical Journal. 341: 974–994. Bibcode:1989ApJ...341..974W. doi:10.1086/167557.
  4. 1 2 Greenhill; Hill, K. M.; Dieters, S.; Fienberg, K.; et al. (2006). "Decrease in the orbital period of dwarf nova OY Carinae". Monthly Notices of the Royal Astronomical Society. 372 (3): 1129–1132. arXiv:astro-ph/0602331. Bibcode:2006MNRAS.372.1129G. doi:10.1111/j.1365-2966.2006.10920.x. S2CID 15940077.
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