6533b853fe1ef96bd12ac257
RESEARCH PRODUCT
A giant planet beyond the snow line in microlensing event OGLE-2011-BLG-0251
N. KainsR.a. StreetJ.-y. ChoiC. HanA. UdalskiL.a. AlmeidaF. JablonskiP.j. TristramUffe Gråe JørgensenM.k. SzymańskiM. KubiakG. PietrzyńskiI. SoszyńskiR. PoleskiS. KozłowskiP. PietrukowiczK. UlaczykŁ. WyrzykowskiJ. SkowronY. TsaprasK.a. AlsubaiV. BozzaP. BrowneM. J. BurgdorfS. Calchi NovatiP. DoddsM. DominikS. DreizlerX.-s. FangF. GrundahlC.-h. GuS. HardisKennet Bomann West HarpsøeF. V. HessmanT. C. HinseAllan HornstrupM. HundertmarkJens Jessen-hansenE. KerinsC. LiebigM. LundM. LundkvistL. ManciniM. MathiasenM. T. PennyS. RahvarD. RicciK.c. SahuG. ScarpettaJ. SkottfeltC. SnodgrassJ. SouthworthJ. SurdejJ. Tregloan-reedJ. WambsganssO. WertzD. BajekD.m. BramichK. HorneS. IpatovI.a. SteeleY. TsaprasF. AbeD.p. BennettI.a. BondC.s. BotzlerP. ChoteM. FreemanA. FukuiK. FurusawaY. ItowC.h. LingK. MasudaY MatsubaraN. MiyakeY. MurakiK. OhnishiN. RattenburyT. SaitoD.j. SullivanT. SumiD. SuzukiK. SuzukiW.l. SweatmanS. TakinoK. WadaP.c.m. YockW. AllenV. BatistaS.-j. ChungG. ChristieD.l. DepoyJ. DrummondB.s. GaudiA. GouldC. HendersonY.k. JungJ.-r. KooC.-u. LeeJ. MccormickD. McgregorJ.a. MuñozT. NatuschH. NganH. ParkR.w. PoggeI.-g. ShinJ. YeeM.d. AlbrowE. BacheletJ.-p. BeaulieuS. BrillantJ.a.r. CaldwellA. CassanA. ColeE. CorralesCh. CouturesS. DietersD. Dominis PresterJ. DonatowiczP. FouquéJ. GreenhillS.r. KaneD. KubasJ.-b. MarquetteR. MartinP. MeintjesJ. MenziesK.r. PollardA. WilliamsD. WoutersM. Zubsubject
planets and satellites: detection010504 meteorology & atmospheric sciencesSatellitesbulge [Galaxy]FOS: Physical sciencesAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsDiscoveryGravitational microlensing01 natural sciencesGalaxy: bulgeEinstein radiusLensgravitational lensing: weakSettore FIS/05 - Astronomia e AstrofisicaPlanetSnow0103 physical sciencesgravitational lensing; weak; planets and satellites; detection; planetary systems; Galaxy; bulgegravitational lensing: weak; planets and satellites: detection; planetary systems; Galaxy: bulgeBinaryQB Astronomy010303 astronomy & astrophysicsplanetary systemsAstrophysics::Galaxy Astrophysics0105 earth and related environmental sciencesQBPhysicsEarth and Planetary Astrophysics (astro-ph.EP)Giant planetSystemsSearchAstronomy and AstrophysicsRadiusFrequencyPlanetary systemMass ratioMassLight curveStarsAlgorithmdetection [Planets and satellites]Planetary systemsSpace and Planetary ScienceDwarfAstrophysics::Earth and Planetary Astrophysicsweak [Gravitational lensing]Astrophysics - Earth and Planetary Astrophysicsdescription
We present the analysis of the gravitational microlensing event OGLE-2011-BLG-0251. This anomalous event was observed by several survey and follow-up collaborations conducting microlensing observations towards the Galactic Bulge. Based on detailed modelling of the observed light curve, we find that the lens is composed of two masses with a mass ratio q=1.9 x 10^-3. Thanks to our detection of higher-order effects on the light curve due to the Earth's orbital motion and the finite size of source, we are able to measure the mass and distance to the lens unambiguously. We find that the lens is made up of a planet of mass 0.53 +- 0.21,M_Jup orbiting an M dwarf host star with a mass of 0.26 +- 0.11 M_Sun. The planetary system is located at a distance of 2.57 +- 0.61 kpc towards the Galactic Centre. The projected separation of the planet from its host star is d=1.408 +- 0.019, in units of the Einstein radius, which corresponds to 2.72 +- 0.75 AU in physical units. We also identified a competitive model with similar planet and host star masses, but with a smaller orbital radius of 1.50 +- 0.50 AU. The planet is therefore located beyond the snow line of its host star, which we estimate to be around 1-1.5 AU.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-04-01 | Astronomy and Astrophysics |