DP Leonis
{{Short description|Star system in the constellation Leo}}
{{Starbox begin}}
{{Starbox image
| image = 250px
| caption = A white-light light curve for DP Leonis, adapted from Beuermann et al. (2014)
}}
{{Starbox observe
| epoch = J2000.0
| constell = Leo
| dec = {{DEC|+17|57|41.6804}}
}}
{{Starbox character
| class =
| variable = AM Her
}}
{{Starbox astrometry
| prop_mo_ra = −28.700
| prop_mo_dec = −1.444
| parallax = 3.2781
| p_error = 0.3110
| absmag_v =
}}
{{Starbox orbit
| axis_unitless =
| eccentricity = 0.0 (fixed)
}}
{{Starbox detail
| component1 = White dwarf
| radius =
| luminosity =
| component2 = Donor star
| radius2 =
| luminosity2 =
| temperature2 =
}}
{{Starbox catalog
| names = {{odlist | V=DP Leo }}, X 11146+182
}}
{{Starbox reference
| Simbad = DP+Leo
| NSTED = DP+Leo
| EPE = DP+Leo
}}
{{Starbox end}}
DP Leonis (abbreviated DP Leo) is a binary star system in the equatorial constellation of Leo. It is a variable star that ranges in apparent visual magnitude from 17.5 down to 19. The system is located at a distance of approximately 990 light-years from the Sun based on parallax. It is 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. This eclipsing variable was discovered by P. Biermann and associates in 1982 as the optical counterpart to the EINSTEIN X-ray source E1114+182.
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. The object is roughly 6 times more massive than Jupiter and is located 8.6 AU from the binary.
{{OrbitboxPlanet begin
| period_unit = year
}}
{{OrbitboxPlanet
| exoplanet = b
| mass = ≥6.1 ± 0.5
| period = 28.0 ± 2.0
| semimajor = 8.2 ± 0.4
| eccentricity = 0.39 ± 0.13
}}
{{Orbitbox end}}
See also
References
{{Reflist|colwidth=30em|refs=
{{Cite Gaia DR2|3971777500966832384}}
| title=DP Leo | access-date=2021-03-25 }}
| title=Radial velocities: The Wilson-Evans-Batten catalogue
| display-authors=1 | last1=Duflot | first1=M.
| last2=Figon | first2=P. | last3=Meyssonnier | first3=N.
| journal=Astronomy and Astrophysics Supplement
| volume=114 | page=269 | date=December 1995
| bibcode=1995A&AS..114..269D }}
| title=The giant planet orbiting the cataclysmic binary DP Leonis
| last1=Beuermann | first1=K. | last2=Buhlmann | first2=J.
| last3=Diese | first3=J. | last4=Dreizler | first4=S.
| last5=Hessman | first5=F. V. | last6=Husser | first6=T. -O.
| last7=Miller | first7=G. F. | last8=Nickol | first8=N.
| last9=Pons | first9=R. | last10=Ruhr | first10=D.
| last11=Schmülling | first11=H. | last12=Schwope | first12=A. D.
| last13=Sorge | first13=T. | last14=Ulrichs | first14=L.
| last15=Winget | first15=D. E. | last16=Winget | first16=K. I.
| display-authors=1 | journal=Astronomy and Astrophysics
| volume=526 | id=A53 | pages=5 | date=February 2011
| arxiv=1011.3905 | bibcode=2011A&A...526A..53B
| doi=10.1051/0004-6361/201015942 | s2cid=119184531 }}
| title=General Catalogue of Variable Stars
| display-authors=1 | last1=Samus | first1=N. N.
| last2=Kazarovets | first2=E. V. | last3=Durlevich | first3=O. V.
| last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N.
| version=5.1 | journal=Astronomy Reports
| date=2017 | volume=61 | issue=1 | pages=80–88
| doi=10.1134/S1063772917010085 | url=http://www.sai.msu.su/gcvs/cgi-bin/search.cgi?search=DP+Leo
| bibcode=2017ARep...61...80S | s2cid=125853869 | access-date=2021-11-30 | url-access=subscription }}
| title=Detection of a Giant Extrasolar Planet Orbiting the Eclipsing Polar DP Leo
| last1=Qian | first1=S.-B. | last2=Liao | first2=W.-P.
| last3=Zhu | first3=L.-Y. | last4=Dai | first4=Z.-B.
| display-authors=1 | journal=The Astrophysical Journal Letters
| volume=708 | issue=1 | pages=L66–L68 | year=2010
| doi=10.1088/2041-8205/708/1/L66 | doi-access=free
| bibcode=2010ApJ...708L..66Q }}
| title=A multiwavelength timing analysis of the eclipsing polar DP Leo
| last1=Schwope | first1=A. D. | last2=Hambaryan | first2=V.
| last3=Schwarz | first3=R. | last4=Kanbach | first4=G.
| last5=Gänsicke | first5=B. T. | display-authors=1
| journal=Astronomy and Astrophysics
| volume=392 | issue=2 | pages=541–551 | year=2002
| doi=10.1051/0004-6361:20011651 | s2cid=17284811
| bibcode=2002A&A...392..541S | arxiv=astro-ph/0111457 }}
| title=The new eclipsing magnetic binary system E 1114+182.
| display-authors=1 | last1=Biermann | first1=P.
| last2=Schmidt | first2=G. D. | last3=Liebert | first3=J.
| last4=Tapia | first4=S. | last5=Strittmatter | first5=P. A.
| last6=West | first6=S. | last7=Stockman | first7=H. S.
| last8=Kuehr | first8=H. | last9=Lamb | first9=D. Q.
| journal=Astrophysical Journal
| volume=293 | pages=303–320 | date=June 1985
| doi=10.1086/163238 | bibcode=1985ApJ...293..303B | doi-access=free }}
}}
{{Sky|11|17|16.00|+|17|57|41.1}}
{{Stars of Leo}}
{{DEFAULTSORT:Dp Leonis}}
Category:M-type main-sequence stars
Category:Polars (cataclysmic variable stars)