OGLE-TR-123

Last updated
OGLE-TR-123
OGLE-TR-123LightCurve.png
A light curve showing the March 30, 2005 planet transit across OGLE-TR-123. Adapted from Pont et al. (2006) [1]
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Carina
Right ascension 11h 06m 51.19s [2]
Declination −61° 11′ 10.1″ [2]
Characteristics
Spectral type F (primary)/M (b) [3]
Apparent magnitude  (I)15.40 (system) [2]
Variable type Eclipsing binary
Astrometry
Distance 5000 ± 1000  ly
(1600 ± 400 [3]   pc)
Orbit
Period (P)1.804 [3] days
Semi-major axis (a)0.031 ± 0.002 AU [3]
Eccentricity (e)0 [3]
Inclination (i)86–90° [3] °
Details [3]
OGLE-TR-123A
Mass 1.3  M☉
Radius 1.55  R☉
Temperature 6700 ± 300  K
OGLE-TR-123b
Mass 0.085  M☉
Radius 0.13  R☉
Other designations
V816  Car, 2MASS  J11065112-6111103
Database references
SIMBAD data

OGLE-TR-123 is a binary stellar system containing one of the smallest main-sequence stars whose radius has been measured. It was discovered when the Optical Gravitational Lensing Experiment (OGLE) survey observed the smaller star eclipsing the larger primary. The orbital period is approximately 1.80 days. [3]

Contents

OGLE-TR-123B

The smaller star, OGLE-TR-123B, is estimated to have a radius around 0.13 solar radii, and a mass of around 0.085 solar masses (M☉), or approximately 90 times Jupiter's. OGLE-TR-123b's mass is close to the lowest possible mass, estimated to be around 0.07 or 0.08 M☉, for a hydrogen-fusing star. [4]

See also

References

  1. ↑ Pont, F.; Moutou, C.; Bouchy, F.; Behrend, R.; Mayor, M.; Udry, S.; Queloz, D.; Santos, N.; Melo, C. (March 2006). "Radius and mass of a transiting M dwarf near the hydrogen-burning limit. OGLE-TR-123" (PDF). Astronomy and Astrophysics. 447 (3): 1035–1039. Bibcode:2006A&A...447.1035P. doi:10.1051/0004-6361:20053692 . Retrieved 11 April 2025.
  2. 1 2 3 The Optical Gravitational Lensing Experiment. Additional Planetary and Low-Luminosity Object Transits from the OGLE 2001 and 2002 Observational Campaigns, A. Udalski, G. Pietrzynski, M. Szymanski, M. Kubiak, K. Zebrun, I. Soszynski, O. Szewczyk, and L. Wyrzykowski, Acta Astronomica53 (June 2003), pp. 133–149.
  3. 1 2 3 4 5 6 7 8 Radius and mass of a transiting M dwarf near the hydrogen-burning limit. OGLE-TR-123, F. Pont, C. Moutou, F. Bouchy, R. Behrend, M. Mayor, S. Udry, D. Queloz, N. Santos, and C. Melo, Astronomy and Astrophysics447, #3 (March 1, 2006), pp. 1035–1039. doi:10.1051/0004-6361:20053692. Bibcode:2006A&A...447.1035P.
  4. ↑ Theory of Low-Mass Stars and Substellar Objects, Gilles Chabrier and Isabelle Baraffe, Annual Review of Astronomy and Astrophysics38 (2000), pp. 337–377.
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