The HARPS search for southern extra-solar planets. XXXVIII. Bayesian re-analysis of three systems. New super-Earths, unconfirmed signals, and magnetic cycles
[en] 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 $\log{(R'_{\rm HK})}$ 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.
The HARPS search for southern extra-solar planets. XXXVIII. Bayesian re-analysis of three systems. New super-Earths, unconfirmed signals, and magnetic cycles
Dumusque, X., Boisse, I., & Santos, N. C. 2014, ApJ, 796, 132
Dumusque, X., Pepe, F., Lovis, C., & Latham, D. W. 2015, ApJ, 808, 171
van Leeuwen, F. 2007, Hipparcos, the New Reduction of the Raw Data, Astrophys. Space Sci. Lib., 350
Feroz, F., & Hobson, M. P. 2014, MNRAS, 437, 3540
Figueira, P., Marmier, M., Boué, G., et al. 2012, A&A, 541, A139
Fischer, D. A., Marcy, G. W., Butler, R. P., et al. 2001, ApJ, 551, 1107
Fischer, D. A., Marcy, G. W., Butler, R. P., et al. 2003, ApJ, 586, 1394
Friel, N., & Wyse, J. 2012, Statistica Neerlandica, 66, 288
Fulton, B. J., Weiss, L. M., Sinuko, E., et al. 2015, ApJ, 805, 175
Geweke, J. 1989, Econometrica, 57, 1317
Gomes da Silva, J., Santos, N. C., Bonfils, X., et al. 2012, A&A, 541, A9
Gray, D. F., & Baliunas, S. L. 1995, ApJ, 441, 436
Gray, D. F., Baliunas, S. L., Lockwood, G. W., & Ski, B. A. 1996, ApJ, 465, 945
Gregory, P. C. 2005, Bayesian Logical Data Analysis for the Physical Sciences: A Comparative Approach with Mathematica Support (Cambridge, UK: Cambridge University Press)
Gregory, P. C. 2007, MNRAS, 381, 1607
Gregory, P. C. 2011, MNRAS, 415, 2523
Gregory, P. C. 2012, ArXiv e-prints [arXiv:1212. 4058]
Hall, J. C., Lockwood, G. W., & Ski, B. A. 2007, AJ, 133, 862
Hall, J. C., Henry, G. W., Lockwood, G. W., Ski, B. A., & Saar, S. H. 2009, AJ, 138, 312
Hatzes, A. P. 2002, Astron. Nachr., 323, 392
Hatzes, A. P. 2013, ApJ, 770, 133
Henry, T. J., Soderblom, D. R., Donahue, R. A., & Baliunas, S. L. 1996, AJ, 111, 439
Isaacson, H., & Fischer, D. 2010, ApJ, 725, 875
Kass, R. E., & Raftery, A. E. 1995, J. Am. Statist. Assn., 90, 773
Kipping, D. M. 2013, MNRAS, 434, L51
Lindegren, L., & Dravins, D. 2003, A&A, 401, 1185
Lissauer, J. J., Marcy, G. W., Rowe, J. F., et al. 2012, ApJ, 750, 112
Lissauer, J. J., Marcy, G. W., Bryson, S. T., et al. 2014, ApJ, 784, 44
Lovis, C., Dumusque, X., Santos, N. C., et al. 2011, A&A, unpublished [arXiv:1107. 5325]
Lovis, C., Ségransan, D., Mayor, M., et al. 2011, A&A, 528, A112
Mamajek, E. E., & Hillenbrand, L. A. 2008, ApJ, 687, 1264
Marcy, G. W., Isaacson, H., Howard, A. W., et al. 2014, ApJS, 210, 20
Mauas, P. J. D., Buccino, A., Díaz, R., et al. 2012, in IAU Symp. 286, eds. C. H. Mandrini, & D. F. Webb, 317
Mayor, M., Pepe, F., Queloz, D., et al. 2003, The Messenger, 114, 20
Mayor, M., Udry, S., Lovis, C., et al. 2009, A&A, 493, 639
Mayor, M., Marmier, M., Lovis, C., et al. 2011, A&A, submitted [arXiv:1109. 2497]