Astronomy:OGLE-2003-BLG-235L

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Short description: Microlensing event in the constellation Sagittarius
OGLE-2003-BLG-235L
Observation data
Equinox J2000.0]] (ICRS)
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☉
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

OGLE-2003-BLG-235L (MOA-2003-BLG-53L) is a star in the constellation of Sagittarius. The first gravitational microlensing event for which a planet orbiting the lens was detected around this star. The event occurred in during July 2003. Two groups observed and independently detected the event: the Optical Gravitational Lensing Experiment (OGLE) and the Microlensing Observations in Astrophysics (MOA), hence, the double designation.[2] It is an orange dwarf star of spectral type K, which is accompanied by a giant planet.[3]

Lens system

OGLE-2003-BLG-235L and 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 — — — —

See also

References

  1. ↑ 1.0 1.1 1.2 "SIMBAD query result: NAME OGLE 2003-BLG-235 -- Star". Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=EWS+2003-BUL-235. 
  2. ↑ 2.0 2.1 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. doi:10.1086/420928. Bibcode: 2004ApJ...606L.155B. 
  3. ↑ 3.0 3.1 3.2 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. doi:10.1086/507585. Bibcode: 2006ApJ...647L.171B. 
  4. ↑ David Bennett. "The Microlensing Planet Finder (MPF)". Navigator Program Forum-2007: Small- and Mid-Scale Exoplanet Space Missions. http://planetquest.jpl.nasa.gov/NavigatorForum/documents/May18-2007/10-AnExtrasolarPlanetCensusMicrolensingPlanetFinder-Bennett.pdf. 

External links

Coordinates: Sky map 18h 05m 16.35s, −28° 53′ 42.0″


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