A planet-sized transiting star around OGLE-TR-122 – Accurate mass and radius near the Hydrogen-burning limit
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Astrophysics, abstract
astro-ph/0501611
From: Frederic Pont [view email]
Date (v1): Thu, 27 Jan 2005 16:25:24 GMT (86kb)
Date (revised v2): Wed, 2 Mar 2005 12:54:58 GMT (29kb)
A planet-sized transiting star around OGLE-TR-122 – Accurate mass and
radius near the Hydrogen-burning limit
Authors:
F. Pont,
C. H. F. Melo,
F. Bouchy,
S. Udry,
D. Queloz,
M. Mayor,
N. C. Santos
Comments: 4 pages, 3 figures, A&A letters, in Press. Revised
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 Mo
and R=0.120 +0.024-0.013 Ro, 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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