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

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OGLE-2003-BLG-235/MOA-2003-BLG-53
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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.[1]

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.[2]
Contents
[hide]

* 1 Lens system
o 1.1 Planet
* 2 References
* 3 External links

[edit] Lens system
OGLE-2003-BLG-235L Observation data
Epoch J2000.0
Constellation Sagittarius
Right ascension 18h 05m 16.35s
Declination -28° 53' 42.0"
Apparent magnitude (V) +19.7
Distance ~19000 ly
(~5800 pc)
Spectral type K
Other designations
MOA-2003-BLG-53L

OGLE-2003-BLG-235L/MOA-2003-BLG-53L is the lens star. 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.[1]

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.[2] This enables an estimate of the distance to the lens star, which puts it at around 5.8 kiloparsecs (19,000 light years) away.

[edit] Planet
OGLE-2003-BLG-235Lb Extrasolar planet List of extrasolar planets
Orbital elements
Observed separation (d) 4.3+2.5-0.8 AU
Position angle (φ) 223.8°
Closest approach (t0) 2,452,848.06 JD
Physical characteristics
Mass (m) 2.6+0.8-0.6 MJ
Discovery information
Discovery date 2004
Discoverer(s) Bond et al.
Detection method Gravitational microlensing
Discovery status Published
Other designations
MOA-2003-BLG-53Lb

OGLE-2003-BLG-235Lb is an extrasolar planet discovered in 2004 by the OGLE and MOA collaborations. Its high mass indicates that it is most probably a gas giant planet similar to Jupiter. It is located around 4.3 AU away from its parent star.[2]

[edit] References

1. ^ a b Bond et al. (2004). "OGLE 2003-BLG-235/MOA 2003-BLG-53: A planetary microlensing event". Astrophysical Journal 606: L155 – L158.
2. ^ a b c Bennett, D. P., Anderson, J., Bond, I. A., Udalski, A., Gould, A. (2006). "Identification of the OGLE-2003-BLG-235/MOA-2003-BLG-53 Planetary Host Star". The Astrophysical Journal 647 (2): L171 – L174.

[edit] External links

* Notes for star OGLE235-MOA53
* Hubble site document 2006/38
* HST image of planetary host star
* SPACE.com: Hidden Star of Known Planet Found (Ker Than) 08 August 2006 01:01 pm ET


Sirius This main sequence star-related article is a stub. You can help Wikipedia by expanding it.
Exoplanet icon This extrasolar planet related article is a stub. You can help Wikipedia by expanding it.
Retrieved from "http://en.wikipedia.org/wiki/OGLE-2003-BLG-235/MOA-2003-BLG-53"

Categories: Red dwarfs | Extrasolar planets | Gravitational lensing | Sagittarius constellation | Main sequence star stubs | Extrasolar planet stubs
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