MACHO-1997-BLG-41
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 17h 56m 20.7s |
| Declination | −28° 47′ 42″ |
| Apparent magnitude (V) | ? |
ly (3,100 pc) | |
| Spectral type | M / M |
MACHO 402.47862.1576 | |
MACHO-1997-BLG-41, commonly abbreviated as 97-BLG-41 or MACHO-97-BLG-41, was a
spectral type K located at a distance of around 8 kiloparsecs (26,000 light-years). The lens star is a binary system approximately 10,000 light-years away in the constellation Sagittarius. The two stars are separated from each other by about 0.9 AU and have an orbital period of around 1.5 years. The most likely mass of the system is about 0.3 times that of the Sun. Star A and star B are both red dwarfs.[1]
The first published model of the MACHO-1997-BLG-41 event using data from
orange dwarf of spectral class K and a class M red dwarf, respectively. According to this model, a planet with around 3.5 times the mass of Jupiter orbits in a circumbinary orbit around the two stars at a distance of around 7 AU (assuming random orientation of the system).[2]
Subsequently, an independent analysis with data from five different observatories revealed that the microlensing event could be interpreted as being caused by a low-mass binary system of two red dwarf stars located in the
galactic disk if one considers their orbital motion, without the need to invoke a planetary mass.[1] A further study combining both datasets confirmed this finding. The planet is thus considered disproven.[3]
See also
References
External links
- "MACHO 97-BLG-41". SIMBAD. Centre de données astronomiques de Strasbourg.
- Notes for 97-BLG-41 on The Extrasolar Planets Encyclopaedia
- Sincell, Mark (20 August 1999). "A World With Two Suns". Science. Retrieved 2008-06-06.
