Journal
ASTRONOMY & ASTROPHYSICS
Volume 433, Issue 2, Pages L21-L24Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:200500025
Keywords
stars : low-mass, brown-dwarfs; stars : fundamental parameters; stars : binaries; binaries : eclipsing
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We report the discovery and characterisation of OGLE-TR-122b, the smallest main-sequence star to date with a direct radius determination. OGLE-TR-122b transits around its solar-type primary every 7.3-days. With M = 0.092 +/- 0.009 M-. and R = 0.120(-0.013)(+0.020) R-., it is by far the smallest known eclipsing M-dwarf. The derived mass and radius for OGLE-TR-122b are in agreement with the theoretical expectations. OGLE-TR-122b is the first observational evidence that stars can indeed have radii comparable or even smaller than giant planets. In such cases, the photometric signal is exactly that of a transiting planet and the true nature of the companion can only be determined with high-resolution spectroscopy.
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