OGLE-2003-BLG-235/MOA-2003-BLG-53

OGLE-2003-BLG-235/MOA 2003-BLG-53 was a gravitational microlensing event which occurred in the constellation of Sagittarius during July 2003. The event was observed both as part of the Optical Gravitational Lensing Experiment (OGLE) and by the Microlensing Observations in Astrophysics group (MOA), hence the double designation.[2] The source star in the gravitational lens is a main sequence star of spectral type G located around 8.8 kiloparsecs (29,000 light years) away in the galactic bulge. The lens star is an orange dwarf star of spectral type K, which is accompanied by a giant planet.[3]

OGLE-2003-BLG-235L
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagittarius
Right ascension  18h 05m 16.35s[1]
Declination –28° 53′ 42.0″[1]
Apparent magnitude (V) 19.7
Characteristics
Spectral type K5[1]
Astrometry
Distance~19000 ly
(~5800 pc)
Details
Mass0.63 ±0.08 M☉
Other designations
EWS 2003-BUL-235, MOA 2003-BUL-53, MOA 2003-BLG-53
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

Lens system

OGLE-2003-BLG-235L/MOA-2003-BLG-53L is the designation given to the star in the lens system.[4] In 2004, analysis of the light curve produced as it passed in front of the source star allowed detection of an exoplanet orbiting the star with a mass 0.0039 times that of the host star (this would put it in the jovian mass range). The star was originally assumed to be a red dwarf star, since they are the most common type of star in the galaxy.[2]

By 2006, the source and lens star had moved far enough apart (as viewed from Earth) that their light could be separated. Observations by the Hubble Space Telescope revealed that in fact the lens star was actually brighter and less red than expected, matching the expected spectra for a K dwarf of about 0.63 solar masses, more massive than the average star in the galaxy.[3] This enables an estimate of the distance to the lens star, which puts it at around 5.8 kiloparsecs (19,000 light years) away.

Planetary system

The OGLE-2003-BLG-235L/MOA-2003-BLG-53L system consists of one planet as determined by the discovery team and the follow-up confirmation observations.

The OGLE-2003-BLG-235L/MOA-2003-BLG-53L planetary system[3]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 2.6+0.8
−0.6 MJ		 4.3+2.5
−0.8		 — — — —
gollark: ```fsharpprintfn "Hacked with %s" "F#"```
gollark: ```pythonprint("Hacked with python 3")```
gollark: ```print "Hacked with Python 2 or Lua"```
gollark: (produced by the common Unix tool `haxxdump`)
gollark: 011d3b0 ecda fe42 f33d d112 2b8c 7e1d 24d2 11e5011d3c0 2475 ae6a bb0f 0c59 592b 3e75 6074 5f61011d3d0 ff42 a907 c773 c81f 3095 97ba 7fe2 5270011d3e0 c021 d886 1dfc 01eb f22a 0174 38cb ab3e011d3f0 2476 6efa 2bb0 6dde cd92 0222 5467 7221011d400 bb13 2647 77f7 8c51 6206 e40d 3c85 117c011d410 86bb 928f 2234 bb31 298e dd89 7209 6a00011d420 49b1 182b 52fc 6659 f720 c14c 7064 213c011d430 be13 5b7f 36db 9228 232a be39 1c9e 4065011d440 3e92 3fa8 a538 8a60 c599 7c88 9f72 9748011d450 8a5d fc83 b21b e48d 666a 8670 3d61 0225

See also

References
  1. "SIMBAD query result: NAME OGLE 2003-BLG-235 -- Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-04-30.
  2. Bond, I. A.; et al. (2004). "OGLE 2003-BLG-235/MOA 2003-BLG-53: A Planetary Microlensing Event". The Astrophysical Journal Letters. 606 (2): L155–L158. arXiv:astro-ph/0404309. Bibcode:2004ApJ...606L.155B. doi:10.1086/420928.
  3. Bennett, David P.; et al. (2006). "Identification of the OGLE-2003-BLG-235/MOA-2003-BLG-53 Planetary Host Star". The Astrophysical Journal Letters. 647 (2): L171–L174. arXiv:astro-ph/0606038. Bibcode:2006ApJ...647L.171B. doi:10.1086/507585.
  4. David Bennett. "The Microlensing Planet Finder (MPF)" (PDF). Navigator Program Forum-2007: Small- and Mid-Scale Exoplanet Space Missions. Archived from the original (PDF) on 2011-06-08.


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