Seven New Jovian-like Planets from CORALIE

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Seven New Jovian-like Planets from CORALIE

Post by Sirius_Alpha on 28th November 2012, 9:19 pm

The CORALIE survey for southern extrasolar planets XVII. New and updated long period and massive planets
http://arxiv.org/abs/1211.6444

Since 1998, a planet-search program around main sequence stars within 50 pc in the southern hemisphere, is carried out with the CORALIE echelle spectrograph at La Silla Observatory. With an observing time span of more than 14 years, the CORALIE survey is now able to unveil Jovian planets on Jupiter's period domain. This growing period-interval coverage is important regarding to formation and migration models since observational constraints are still weak for periods beyond the ice line. Long-term precise Doppler measurements with the CORALIE echelle spectrograph, together with a few additional observations made with the HARPS spectrograph on the ESO 3.6m telescope, reveal radial velocity signatures of massive planetary companions in long period orbits. In this paper we present seven new planets orbiting HD27631, HD98649, HD106515A, HD166724, HD196067, HD219077, and HD220689 together with the CORALIE orbital parameters for three already known planets around HD10647, HD30562, and HD86226. The period range of the new planetary companions goes from 2200 to 5500 days and covers a mass domain between 1 and 10.5 MJup. Surprisingly, five of them present quite high eccentricities above e>0.57. A pumping scenario by Kozai mechanism may be invoked for HD106515Ab and HD196067b which are both orbiting stars in multiple systems. As the presence of a third massive body can't be inferred from the data of HD98649b, HD166724b, and HD219077b, the origin of the eccentricity of these systems remains unknown. Except for HD10647b, no constraint on the upper mass of the planets is provided by Hipparcos astrometric data. Finally it is interesting to note that the hosts of these long period planets show no metallicity excess.

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Re: Seven New Jovian-like Planets from CORALIE

Post by Edasich on 29th November 2012, 5:15 am

I have to browse it yet. However it is the referred paper Mayor et al. (2011) announced as the new parade of HARPS planets was released in October 2011 (Marmier et al. in press or in preparation). Smile

*Addendum*

HD 210977 b as new entry: very long period super-Jupiter planet in Tucana.

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Re: Seven New Jovian-like Planets from CORALIE

Post by Lazarus on 29th November 2012, 4:53 pm

Substantial decrease in eccentricity for HD 86226b as well.

Nice to see some more potential candidates for direct imaging. Wondering when the first image of a RV-detected planet is going to come out.

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Re: Seven New Jovian-like Planets from CORALIE

Post by jyril on 30th November 2012, 1:55 pm

I wonder how much the high number of eccentric distant planets sample is biased (e.g. multi-planet systems imitating single planets, eccentric planets show up easier in the data?)

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