DP Leonis

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DP Leonis
DP Leo and Planet.png

Artist's rendering of DP Leo and its planetary companion
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
V* DP Leo, X 11146+182[2]
Database references
SIMBAD data
Exoplanet Archive data
Extrasolar Planets
Encyclopaedia
data

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]

Planetary system[edit]

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.

The DP Leonis planetary system[5]
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[edit]

References[edit]

  1. ^ a b "V* DP Leo -- Cataclysmic Var. AM Her type". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2009-12-16. 
  2. ^ a b c "Query= DP Leo". General Catalogue of Variable Stars. Centre de Données astronomiques de Strasbourg. Retrieved 2009-12-16. 
  3. ^ a b 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. 
  4. ^ a b c d e 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. 
  5. ^ 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. 

Coordinates: Sky map 11h 17m 16.00s, +17° 57′ 41.1″