The HARPS search for southern extra-solar planets

Díaz, R. F.; Ségransan, D.; Udry, S.; Lovis, C.; Pepe, F.; Dumusque, X.; Marmier, M.; Alonso, R.; Benz, Willy; Bouchy, F.; Coffinet, A.; Collier Cameron, A.; Deleuil, M.; Figueira, P.; Gillon, M.; Lo Curto, G.; Mayor, M.; Mordasini, Christoph; Motalebi, F.; Moutou, C.; ... (2016). The HARPS search for southern extra-solar planets. Astronomy and astrophysics, 585, A134. EDP Sciences 10.1051/0004-6361/201526729

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We present the analysis of the entire HARPS observations of three stars that host planetary systems: HD1461, HD40307, and HD204313. The data set spans eight years and contains more than 200 nightly averaged velocity measurements for each star. This means that it is sensitive to both long-period and low-mass planets and also to the effects induced by stellar activity cycles. We modelled the data using Keplerian functions that correspond to planetary candidates and included the short- and long-term effects of magnetic activity. A Bayesian approach was taken both for the data modelling, which allowed us to include information from activity proxies such as log(R′HK) in the velocity modelling, and for the model selection, which permitted determining the number of significant signals in the system. The Bayesian model comparison overcomes the limitations inherent to the traditional periodogram analysis. We report an additional super-Earth planet in the HD1461 system. Four out of the six planets previously reported for HD40307 are confirmed and characterised. We discuss the remaining two proposed signals. In particular, we show that when the systematic uncertainty associated with the techniques for estimating model probabilities are taken into account, the current data are not conclusive concerning the existence of the habitable-zone candidate HD40307 g. We also fully characterise the Neptune-mass planet that orbits HD204313 in 34.9 days.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences > Theoretical Astrophysics and Planetary Science (TAPS)
08 Faculty of Science > Physics Institute
08 Faculty of Science > Physics Institute > NCCR PlanetS

UniBE Contributor:

Benz, Willy and Mordasini, Christoph

Subjects:

500 Science > 520 Astronomy
600 Technology > 620 Engineering
500 Science
500 Science > 530 Physics

ISSN:

0004-6361

Publisher:

EDP Sciences

Language:

English

Submitter:

Janine Jungo

Date Deposited:

07 Jun 2018 15:05

Last Modified:

07 Jun 2018 15:05

Publisher DOI:

10.1051/0004-6361/201526729

BORIS DOI:

10.7892/boris.112679

URI:

https://boris.unibe.ch/id/eprint/112679

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