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J/A+A/525/A95      Search for brown-dwarf companions of stars  (Sahlmann+, 2011)

Search for brown-dwarf companions of stars. Sahlmann J., Segransan D., Queloz D., Udry S., Santos N.C., Marmier M., Mayor M., Naef D., Pepe F., Zucker S. <Astron. Astrophys. 525, A95 (2011)> =2011A&A...525A..95S
ADC_Keywords: Binaries, spectroscopic ; Radial velocities Keywords: binaries: spectroscopic - brown dwarfs - stars: low-mass - techniques: radial velocities - astrometry Abstract: The discovery of 9 new brown-dwarf candidates is reported. New CORALIE radial velocities of 6 previously-known hosts of potential brown-dwarf companions are presented. We use Hipparcos data to fully characterise the astrometric orbits of 6 objects, revealing M-dwarf companions with masses between 90MJup and 0.52M. We obtain an upper limit of 0.6% for the frequency of brown-dwarf companions around Sun-like stars. We find that the companion-mass distribution function is rising at the lower end of the brown-dwarf mass range, suggesting that in fact we detect the high-mass tail of the planetary distribution. Description: Spectroscopic data used in this publication: precise radial velocities. The data are plotted in Fig.2, Fig.3, Fig.4, and Fig.5. Two spectrographs were used: CORALIE and HARPS. The CORALIE Echelle spectrograph was upgraded in July 2007 which affected the instrument zero point. We decided to refer to the original CORALIE as CORALIE-98 and to the upgraded one as CORALIE-07. When using both set of data, the instrumental zero point should be adjusted. Instrument used as follows: C98 = CORALIE-98 and C07 = CORALIE-07 as designated by Segransan et al. (2010A&A...511A..45S). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 61 15 Studied stars list tables.dat 48 598 Radial velocities of 15 stars
See also: J/A+A/356/590 : CORALIE survey for extrasolar planets. II (Udry+, 2000) J/A+A/375/205 : CORALIE survey for extrasolar planets. V (Naef+ 2001) J/A+A/379/999 : CORALIE survey for extrasolar planets. VI (Santos+ 2001) J/A+A/388/632 : CORALIE survey for extrasolar planets. VII (Pepe+, 2002) J/A+A/390/267 : CORALIE survey for extrasolar planets. VIII (Udry+, 2002) J/A+A/392/215 : CORALIE survey for extrasolar planets. IX (Santos+ 2002) J/A+A/406/373 : CORALIE survey for extrasolar planets. XI (Santos+, 2003) J/A+A/415/391 : CORALIE survey for extrasolar planets. XII (Mayor+, 2004) J/A+A/447/1159 : CORALIE survey for extrasolar planets. XIV (Eggenberger+ 2006) J/A+A/480/L33 : CORALIE survey for extrasolar planets. XV (Tamuz+ 2008) J/A+A/511/A45 : HD147018, 171238 & 204313 radial velocities (Segransan+, 2010) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Star name (HD or HIP number) 11- 16 I6 --- HIP Hipparcos number (Cat. I/311) 18- 21 A4 --- SpT MK spectral type 24- 28 F5.2 mag Vmag Johnson V magnitude 30- 34 F5.2 mag B-V (B-V) color index 36- 40 F5.1 mas plx Trigonometric parallax 42- 44 F3.1 mas e_plx Mean error on plx 46- 55 F10.4 d Per Best orbital period (from table3) 57- 61 F5.3 --- e Best eccentricity
Byte-by-byte Description of file: tables.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Star name 11- 24 F14.6 d JD Julian Date 26- 34 F9.5 km/s RV Radial velocity 36- 42 F7.5 km/s e_RV Radial velocity error 44- 48 A5 --- Inst Spectrograph configuration used (1)
Note (1): Spectrograph configuration code as follows: C07 = CORALIE-07 (upgraded CORALIE spectrograph, July 2007) C98 = CORALIE-98 (original CORALIE spectrograph) HARPS = HARPS
Acknowledgements: Johannes Sahlmann, Johannes.Sahlmann(at) References: Queloz et al., Paper I 2000A&A...354...99Q Udry et al., Paper II 2000A&A...356..590U, Cat. J/A+A/356/590 Santos et al., Paper III 2000A&A...356..599S Santos et al., Paper IV 2000A&A...361..265S Santos et al., Paper V 2001A&A...375..205S, Cat. J/A+A/375/205 Santos et al., Paper VI 2001A&A...379..999S, Cat. J/A+A/379/999 Pepe et al., Paper VII 2002A&A...388..632P, Cat. J/A+A/388/632 Udry et al., Paper VIII 2002A&A...390..267U, Cat. J/A+A/390/267 Santos et al., Paper IX 2002A&A...392..215S, Cat. J/A+A/392/215 Udry et al., Paper X 2003A&A...407..679U Santos et al., Paper XI 2003A&A...406..373S, Cat. J/A+A/406/373 Mayor et al., Paper XII 2004A&A...415..391M, Cat. J/A+A/415/391 Correia et al., Paper XIII 2005A&A...440..751C Eggenberger et al., Paper XIV 2006A&A...447.1159E, Cat. J/A+A/447/1159 Tamuz et al., Paper XV 2008A&A...480L..33T, Cat. J/A+A/480/L33 Segransan et al., Paper XVI 2010A&A...511A..45S, Cat. J/A+A/511/A45 History: * 03-Dec-2010: on-line version of the tables * 23-Apr-2014: some values corrected for HD 52756 and HD 53680 in table1 (from author)
(End) Patricia Vannier [CDS] 19-Oct-2010
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