2016A&A...585A.134D


Query : 2016A&A...585A.134D

2016A&A...585A.134D - Astronomy and Astrophysics, volume 585A, 134-134 (2016/1-1)

The HARPS search for southern extra-solar planets. XXXVIII. Bayesian re-analysis of three systems. New super-Earths, unconfirmed signals, and magnetic cycles.

DIAZ R.F., SEGRANSAN D., UDRY S., LOVIS C., PEPE F., DUMUSQUE X., MARMIER M., ALONSO R., BENZ W., BOUCHY F., COFFINET A., COLLIER CAMERON A., DELEUIL M., FIGUEIRA P., GILLON M., LO CURTO G., MAYOR M., MORDASINI C., MOTALEBI F., MOUTOU C., POLLACCO D., POMPEI E., QUELOZ D., SANTOS N. and WYTTENBACH A.

Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): techniques: radial velocities - methods: data analysis - methods: statistical - planetary systems

VizieR on-line data: <Available at CDS (J/A+A/585/A134): table1.dat hd1461.dat hd40307.dat hd204313.dat>

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HD 1461c Pl 00 18 41.8673684261 -08 03 10.805762856           ~ 8 0
2 HD 1461 PM* 00 18 41.8676757921 -08 03 10.803829898   7.14 6.46     G3VFe0.5 345 1
3 HD 7924 * 01 21 59.1137270904 +76 42 37.038255120   8.018 7.167     K0.5V 130 1
4 HD 10180 * 01 37 53.5772394024 -60 30 41.482108548   7.95 7.32     G1V 176 2
5 HD 11964 PM* 01 57 09.6074243168 -10 14 32.732533622   7.25 6.42     G9VCN+1 168 1
6 * e Eri PM* 03 19 55.6509122226 -43 04 11.215188426 5.20 4.98 4.27 3.65 3.25 G6V 419 1
7 HD 38529 PM* 05 46 34.9131388488 +01 10 05.502949860       5.4   G8III/IV 331 2
8 HD 40307 PM* 05 54 04.2405000288 -60 01 24.493007640 8.814 8.097 7.147 6.597 6.119 K2.5V 229 1
9 HD 40307g Pl 05 54 04.2409953924 -60 01 24.491747849           ~ 23 1
10 HD 40307f Pl 05 54 04.2409953924 -60 01 24.491747849           ~ 9 1
11 HD 74156 PM* 08 42 25.1219511432 +04 34 41.145751740       7.2   G1V 213 2
12 * rho01 Cnc PM* 08 52 35.8111044043 +28 19 50.954994470 7.45 6.82   5.4   K0IV-V 1038 1
13 BD-07 4003 BY* 15 19 26.8269387505 -07 43 20.189497466 13.403 11.76 10.560 9.461 8.911 M3V 593 2
14 HD 156384C PM* 17 18 58.8272997802 -34 59 48.612673382 12.96 11.79 10.22 10.05 8.82 M1.5V 191 1
15 Kepler-102 PM* 18 45 55.8559851072 +47 12 28.845259020   12.58 12.07     K3V 92 0
16 HD 204313 PM* 21 28 12.2060861256 -21 43 34.518205128   8.696 8.02 7.76   G5V 100 2
17 BD-15 6290 BY* 22 53 16.7325836486 -14 15 49.304052185 12.928 11.749 10.192 9.013 7.462 M3.5V 930 1
18 HD 219134 Er* 23 13 16.9749603608 +57 10 06.083823619 7.460 6.560 5.570 4.76 4.23 K3V 559 1

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2022.08.15-14:43:05

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