J/A+A/566/A35ivo://CDS.VizieR/J/A+A/566/A35doi:10.26093/cds/vizier.35660035CDSSantos N.C.Mortier A.Faria J.P.Dumusque X.Adibekyan V.Zh.,Delgado Mena E.Figueira P.Benamati L.Boisse I.Cunha D.,Gomes da Silva J.Lo Curto G.Lovis C.Martins J.H.C.Mayor M.Melo C.,Oshagh M.Pepe F.Queloz D.Santerne A.Segransan D.Sozzetti A.,Sousa S.G.Udry S.2019-06-17T16:08:52Z2014-06-05T08:58:34ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frmultiple-starssolar-system-planetsradial-velocityThe search for planets orbiting metal-poor stars is of uttermost importance for our understanding of the planet formation models. However, no dedicated searches have been conducted so far for very low mass planets orbiting such objects. Only a few cases of low mass planets orbiting metal-poor stars are thus known. Amongst these, HD 41248 is a metal-poor, solar-type star on which a resonant pair of super-Earth like planets has been announced. This detection was based on 62 radial velocity measurements obtained with the HARPS spectrograph (public data). In the present paper we present a new planet search program that is using the HARPS spectrograph to search for Neptunes and Super-Earths orbiting a sample of metal-poor FGK dwarfs. We then present a detailed analysis of an additional 162 radial velocity measurements of HD 41248, obtained within this program, with the goal of confirming the existence of the proposed planetary system. We analyzed the precise radial velocities, obtained with the HARPS spectrograph, together with several stellar activity diagnostics and line profile indicators. A careful analysis shows no evidence for the planetary system previously announced. One of the signals, with a period of ~25 days, is shown to be related to the rotational period of the star, and is clearly seen in some of the activity proxies. The remaining signal (P~18 days) could not be convincingly retrieved in the new data set. We discuss possible causes for the complex (evolving) signals observed in the data of HD 41248, proposing that they may be explained by the appearance and disappearance of active regions on the surface of a star with strong differential rotation, or by a combination of the sparse data sampling and active region evolution.2014A&A...566A..35Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/566/A35CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/469/L43 : Radial velocities of Gl 581 (Udry+, 2007)J/A+A/474/293 : Radial velocities of GJ 674 (Bonfils+, 2007)J/A+A/493/639 : Velocity curves of HD 40307 (Mayor+, 2009)J/A+A/493/645 : Gl 176 radial velocities (Forveille+, 2009)J/A+A/496/513 : RV of 6 stars with long-period giant planets (Moutou+, 2009)J/A+A/496/521 : Radial velocities of HD45364 (Correia+, 2009)J/A+A/496/527 : Radial velocity curves of HD 47186 & HD 181433 (Bouchy+, 2009)J/A+A/507/487 : GJ 581 radial velocity curve (Mayor+, 2009)J/A+A/511/A21 : Radial velocities of GJ876 planetary system (Correia+, 2010)J/A+A/512/A46 : Radial velocities of BD-08 2823 (Hebrard+, 2010)J/A+A/512/A47 : Radial velocities of 3 stars with giant planets (Santos+ 2010)J/A+A/512/A48 : HD125612, HD215497, HIP5158 HARPS RV curves (Lo Curto+, 2010)J/A+A/523/A15 : HARPS XXIII: RV data for the 8 targets (Naef+, 2010)J/A+A/526/A111 : Radial velocity of HD 85390, 90156, 103197 (Mordasini+, 2011)J/A+A/526/A112 : Radial velocities of HARPS metal-poor sample (Santos+, 2011)J/A+A/526/A141 : Velocity monitoring of Gl 676A and HIP 12961 (Forveille+ 2011)J/A+A/527/A63 : 7 new HARPS planetary systems RV (Moutou+, 2011)J/A+A/528/A112 : Radial velocities of HD 10180 (Lovis+, 2011)J/A+A/551/A59 : HD103774, HD109271 and BD-061339 RV curves (Lo Curto+, 2013)J/A+A/556/A110 : HARPS radial velocities of GJ 163 (Bonfils+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/566/A35https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/566/A35http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/566/A35https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/566/A35https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/566/A35http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/566/A35GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/566/A35/table1 (overview)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/566/A35/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/566/A35/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/566/A35/table1?GETtext/xml+votable180.050000true0.2425-11.82361110.0055555555555555566/12424 17047 17206 17249 17374 17744 18591 18615 19466 20495 20661 21550 21696 21809 21989 22118 22760 23096 24759 25015 25136 25258 25527 25820 25981 26305 26655 26812 27019 27255 27661 27741 29521 30825 31503 31813 33555 33949 34684 35152 35533 36540 37164 37232 37252 37654 37668 37789 37797 37831 38138 38283 38349 38566 38971 38986 39030 39074 39584 39888 39984 40662 40853 40931 40965 40988 41443 41460 41564 41591 41755 41853 42166 42928 43001 43068 43287 43310 43315 43567 43610 44608 44653 44683 44816 44910 44951 45420 45446 45682 45721 45758 45837 45907 45982 46053 46076 46084 47137 47407 47647 47930 48260 48335 48490 48731 48736 49028 49042https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/566/A35?format=asciidefaultJ/A+A/566/A35/hd41248Radial velocities of HD41248recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[52943/56633] Barycentric Julian date (BJD-2400000)dtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricdoublee_RVError radial velocitykm/sstat.errordoubleJ/A+A/566/A35/table1overviewrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharVmagAbsolute V magnitudemagphot.mag;em.opt.VfloatRAJ2000Right Ascension J2000pos.eq.ra;meta.mainDEJ2000Declination J2000pos.eq.dec;meta.mainSimbadSimbad column added by the CDSmeta.ref.urlchar