Astronomy:DP Leonis

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Star system in the constellation Leo
DP Leonis
Observation data
Equinox J2000.0]] (ICRS)
Constellation Leo
Right ascension  11h 17m 15.92381s[1]
Declination +17° 57′ 41.6804″[1]
Apparent magnitude (V) 17.5-19[2]
Characteristics
Spectral type DA / M5V?
Variable type XM[2]
Astrometry
Radial velocity (Rv)0.0[3] km/s
Proper motion (μ) RA: −28.700[1] mas/yr
Dec.: −1.444[1] mas/yr
Parallax (π)3.2781 ± 0.3110[1] mas
Distance990 ± 90 ly
(310 ± 30 pc)
Absolute magnitude (MV)9.5-11
Orbit
Period (P)0.0623628426[4] yr
Semi-major axis (a)0.0027 AU
Eccentricity (e)0.0
Inclination (i)79.5 [5]°
Details
Mass0.6/0.09[5] M
Radius0.0114[5]/0.12? R
Luminosity0.00449/0.00105? L
Temperature13,500/3000? K
Other designations
DP Leo,[6] X 11146+182[2]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia
data

DP Leonis (abbreviated DP Leo) is an eclipsing binary system approximately 1304 light-years away from the Sun,[5] 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.[7]

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.[5] The object is roughly 6 times more massive than Jupiter and is located 8.6 AU from the binary.

The DP Leonis planetary system[4]
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

  1. 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. 2.0 2.1 2.2 "Query= DP Leo". General Catalogue of Variable Stars. Centre de Données astronomiques de Strasbourg. http://www.sai.msu.su/gcvs/cgi-bin/search.cgi?search=DP+Leo. Retrieved 2009-12-16. 
  3. Duflot, M. et al. (December 1995). "Radial velocities: The Wilson-Evans-Batten catalogue". Astronomy and Astrophysics Supplement 114: 269. Bibcode1995A&AS..114..269D. 
  4. 4.0 4.1 Beuermann, K. et al. (February 2011). "The giant planet orbiting the cataclysmic binary DP Leonis". Astronomy and Astrophysics 526: 5. doi:10.1051/0004-6361/201015942. A53. Bibcode2011A&A...526A..53B. 
  5. 5.0 5.1 5.2 5.3 5.4 Schwope, A. D. et al. (2002). "A multiwavelength timing analysis of the eclipsing polar DP Leo". Astronomy and Astrophysics 392 (2): 541–551. doi:10.1051/0004-6361:20011651. Bibcode2002A&A...392..541S. 
  6. "DP Leo". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=DP+Leo. 
  7. 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. doi:10.1088/2041-8205/708/1/L66. Bibcode2010ApJ...708L..66Q. 

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