Issue |
A&A
Volume 476, Number 2, December III 2007
|
|
---|---|---|
Page(s) | L13 - L16 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361:20078787 | |
Published online | 06 November 2007 |
Letter to the Editor
HD 17156b: a transiting planet with a 21.2-day period and an eccentric orbit
1
LAM, Traverse du Siphon, BP 8, Les Trois Lucs, 13376 Marseille Cedex 12, France e-mail: [mauro.barbieri;roi.alonso]@oamp.fr
2
University of California Observatories, University of California at Santa Cruz Santa Cruz, CA 95064, USA e-mail: laugh@ucolick.org
3
Instituto de Astrofísica de Canarias, C/Vía Láctea s/n, 38200 La Laguna, Spain
4
Racoon Run Observatory, Pleasanton, CA, USA
5
23819 Ladeene Avenue, Torrance, CA 90505, USA
6
Università di Bologna, Dipartimento di Astronomia, via Ranzani 1, 40127 Bologna, Italy
7
Associazione Friulana di Astronomia e Meteorologia, Piazza Miani nr. 2, 33047 Remanzacco, Italy
8
Istituto Spezzino Ricerche Astronomiche, via Castellazzo 8/d, 19123 La Spezia, Italy
9
Stazione Astronomica di Sozzago, 28060 Sozzago, Italy
Received:
4
October
2007
Accepted:
24
October
2007
We report the detection of transits by the
companion to the
G0V star HD 17156. The transit was
observed by three independant observers on Sep. 9/10, 2007 (two in
central Italy and one in the Canary Islands), who obtained detections at
confidence levels of 3.0σ, 5.3σ, and 7.9σ,
respectively. The observations were carried out under the auspices of
the Transitsearch.org network, which organizes follow-up photometric
transit searches of known planet-bearing stars during the time intervals
when transits might be expected to occur. Analyses of the
7.9σ data set indicates a transit depth
± 0.0004
and a transit duration
± 5 min. These values are
consistent with the transit of a Jupiter-sized planet with an impact
parameter
. This planet occupies a
unique regime among known transiting extrasolar planets, both as a
result of its large orbital eccentricity (
) and long orbital
period (
). The planet receives a 26-fold variation in
insolation during the course of its orbit, which will make it a useful
object for characterizing exoplanetary atmospheric dynamics.
Key words: binaries: eclipsing / planetary systems / stars: individual: HD 17156 / techniques: photometric
© ESO, 2007
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