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Issue A&A
Volume 426, Number 1, October IV 2004
Page(s) L15 - L18
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200400066



A&A 426, L15-L18 (2004)
DOI: 10.1051/0004-6361:200400066

Letter

The "missing link": A 4-day period transiting exoplanet around OGLE-TR-111

F. Pont1, F. Bouchy2, D. Queloz1, N. C. Santos3, C. Melo4, M. Mayor1 and S. Udry1

1  Observatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
    e-mail: frederic.pont@obs.unige.ch
2  Laboratoire d'Astrophysique de Marseille, Traverse du Siphon, 13013 Marseille, France
3  Lisbon Observatory, Tapada da Ajuda, 1349-018 Lisboa, Portugal
4  ESO, Casilla 19001, Santiago 19, Chile

(Received 9 August 2004 / Accepted 6 September 2004)

Abstract
We report the discovery of a transiting hot Jupiter around OGLE-TR-111, from our radial velocity follow-up of OGLE transiting candidates in Carina. The planet has a mass of $0.53 \pm 0.11$  $M_{\rm J}$ and a radius of 1.0+0.13-0.06  $R_{\rm J}$. Three transiting exoplanets have already been found among OGLE candidates, all with periods near 1.5 days. The planet presented here, with P=4.0 days, is the first exoplanet detected by transits with the characteristics of a "normal" hot Jupiter, as found in abundance by radial velocity surveys. The radius of OGLE-TR-111b and the scarcity of hot Jupiters detected among OGLE transit candidates tend to indicate that the case of HD 209458b, with a radius of 1.4  $R_{\rm J}$, is exceptional, with most hot Jupiters being smaller.


Key words: techniques: radial velocities -- instrumentation: spectrographs -- stars: planetary systems

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