TY - JOUR
T1 - The HARPS search for southern extra-solar planets
T2 - XX. Planets around the active star BD -08°2823
AU - Hébrard, G.
AU - Udry, S.
AU - Lo Curto, G.
AU - Robichon, N.
AU - Naef, D.
AU - Ehrenreich, D.
AU - Benz, W.
AU - Bouchy, F.
AU - Lecavelier Des Etangs, A.
AU - Lovis, C.
AU - Mayor, M.
AU - Moutou, C.
AU - Pepe, F.
AU - Queloz, D.
AU - Santos, N. C.
AU - Ségransan, D.
PY - 2010/1/1
Y1 - 2010/1/1
N2 - We report the detection of a planetary system around BD-08° 2823 that includes at least one Uranus-mass planet and one Saturn-mass planet. This discovery serendipitously originates from a search for planetary transits in the Hipparcos  photometry database. This program preferentially selected active stars and did not allow the detection of new transiting planets. It allowed however the identification of the K3V star BD-08° 2823 as a target harboring a multiplanet system, which we secured and characterized thanks to an intensive monitoring with the HARPS spectrograph at the 3.6-m ESO telescope in La Silla. The stellar activity level of BD-08 ° complicates the analysis but does not prohibit the detection of two planets around this star. BD-08° 2823 has a minimum mass of 14.4\pm2.1 M and an orbital period of 5.60 days, whereas BD-08°2823 has a minimum mass of 0.33\pm0.03 MJupand an orbital period of 237.6 days. This new system strengthens the observation that low-mass planets are preferentially found in multiplanetary systems, but not around high-metallicity stars as is the case for massive planets. It also supports the belief that active stars should not be neglected in exoplanet searches even when searching for low-mass planets.
AB - We report the detection of a planetary system around BD-08° 2823 that includes at least one Uranus-mass planet and one Saturn-mass planet. This discovery serendipitously originates from a search for planetary transits in the Hipparcos  photometry database. This program preferentially selected active stars and did not allow the detection of new transiting planets. It allowed however the identification of the K3V star BD-08° 2823 as a target harboring a multiplanet system, which we secured and characterized thanks to an intensive monitoring with the HARPS spectrograph at the 3.6-m ESO telescope in La Silla. The stellar activity level of BD-08 ° complicates the analysis but does not prohibit the detection of two planets around this star. BD-08° 2823 has a minimum mass of 14.4\pm2.1 M and an orbital period of 5.60 days, whereas BD-08°2823 has a minimum mass of 0.33\pm0.03 MJupand an orbital period of 237.6 days. This new system strengthens the observation that low-mass planets are preferentially found in multiplanetary systems, but not around high-metallicity stars as is the case for massive planets. It also supports the belief that active stars should not be neglected in exoplanet searches even when searching for low-mass planets.
KW - Planetary systems
KW - Stars: individual: BD-08° 2823
KW - Techniques: photometric
KW - Techniques: radial velocities
U2 - 10.1051/0004-6361/200913525
DO - 10.1051/0004-6361/200913525
M3 - Article
AN - SCOPUS:77951684512
SN - 0004-6361
VL - 512
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
IS - 7
M1 - A46
ER -