DP Leonis
DP Leonis (abbreviated DP Leo) is an eclipsing binary system approximately 1304 light-years away from the Sun,[4] probably a cataclysmic variable star of the AM Herculis-type also known as polars. The system comprises an eclipsing white dwarf and red dwarf in tight orbit (nearly 1.5 hours) and an extrasolar planet.[3]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Leo |
| Right ascension | 11h 17m 16.00s[1] |
| Declination | +17° 57′ 41.1″[1] |
| Apparent magnitude (V) | 17.5-19[2] |
| Characteristics | |
| Spectral type | DA / M5V? |
| Variable type | XM[2] |
| Astrometry | |
| Radial velocity (Rv) | 0 km/s |
| Distance | 1304 ly (400[3] pc) |
| Absolute magnitude (MV) | 9.5-11 |
| Details | |
| Mass | 0.6/0.09 [4] M☉ |
| Radius | 0.0114 [4]/0.12? R☉ |
| Luminosity | 0.00449/0.00105? L☉ |
| Temperature | 13,500/3000? K |
| Orbit | |
| Period (P) | 0.0001708 yr |
| Semi-major axis (a) | 0.0027 AU |
| Eccentricity (e) | 0.0 |
| Inclination (i) | 79.5 [4]° |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
Planetary system
In 2010, Qian et al. announced the detection of a third body of planetary mass around the eclipsing binary system. The presence of a third body had already been suspected in 2002.[4] The object is roughly 6 times more massive than Jupiter and is located 8.6 AU from the binary.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥6.1 ± 0.5 MJ | 8.2 ± 0.4 | 28.0 ± 2.0 | 0.39 ± 0.13 | — | — |
See also
References
- "V* DP Leo -- Cataclysmic Var. AM Her type". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2009-12-16.
- "Query= DP Leo". General Catalogue of Variable Stars. Centre de Données astronomiques de Strasbourg. Retrieved 2009-12-16.
- Qian, S.-B.; et al. (2010). "Detection of a Giant Extrasolar Planet Orbiting the Eclipsing Polar DP Leo". The Astrophysical Journal Letters. 708 (1): L66–L68. Bibcode:2010ApJ...708L..66Q. doi:10.1088/2041-8205/708/1/L66.
- Schwope, A. D.; et al. (2002). "A multiwavelength timing analysis of the eclipsing polar DP Leo". Astronomy and Astrophysics. 392 (2): 541–551. arXiv:astro-ph/0111457. Bibcode:2002A&A...392..541S. doi:10.1051/0004-6361:20011651. S2CID 17284811.
- Beuermann, K.; et al. (2011). "The giant planet orbiting the cataclysmic binary DP Leonis". Astronomy and Astrophysics. 526. Article Number A53. arXiv:1011.3905. Bibcode:2011A&A...526A..53B. doi:10.1051/0004-6361/201015942. S2CID 119184531.
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