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J/ApJ/701/1922       Radio interferometric planet search. I.      (Bower+, 2009)

Radio interferometric planet search. I. First constraints on planetary companions for nearby, low-mass stars from radio astrometry. Bower G.C., Bolatto A., Ford E.B., Kalas P. <Astrophys. J., 701, 1922-1939 (2009)> =2009ApJ...701.1922B
ADC_Keywords: Stars, M-type ; Radio continuum ; Proper motions ; Parallaxes, trigonometric Keywords: astrometry - planetary systems - radio continuum: stars - stars: activity - stars: early-type Abstract: Radio astrometry of nearby, low-mass stars has the potential to be a powerful tool for the discovery and characterization of planetary companions. We present a Very Large Array survey of 172 active M dwarfs at distances of less than 10pc. Twenty-nine stars were detected with flux densities greater than 100uJy. We observed seven of these stars with the Very Long Baseline Array at milliarcsecond resolution in three separate epochs. With a detection threshold of 500uJy in images of sensitivity 1σ∼100uJy, we detected three stars three times (GJ 65B, GJ 896A, GJ 4247), one star twice (GJ 285), and one star once (GJ 803). Two stars were undetected (GJ 412B and GJ 1224). For the four stars detected in multiple epochs, residuals from the optically determined apparent motions have an root-mean-square deviation of ∼0.2 milliarcseconds, consistent with statistical noise limits. Combined with previous optical astrometry, these residuals provide acceleration upper limits that allow us to exclude planetary companions more massive than 3-6MJup at a distance of ∼1AU with a 99% confidence level. Description: Stars were drawn from two samples: active stars in the California & Carnegie planet search (Wright 2005PASP..117..657W) and X-ray selected nearby stars which are too active for radial velocity searches (NEXXUS; Schmitt & Liefke 2004, Cat. J/A+A/417/651). X-ray fluxes are from the ROSAT all sky survey. We used the VLA to observe our sample in 2005 June through September. Observations were made at 5GHz in standard continuum mode. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 130 135 Stellar data table2.dat 26 51 VLA detected star table3.dat 26 134 VLA undetected star
See also: V/35 : CATALOGUE OF NEARBY STARS AND NEARBY STAR DATA PUBLISHED 1969-78 V/70 : Nearby Stars, Preliminary 3rd Version (Gliese+ 1991) J/PASP/122/885 : Gliese catalog star/2MASS cross identifications (Stauffer+, 2010) J/A+A/417/651 : NEXXUS ROSAT survey of coronal X-ray (Schmitt+, 2004) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 6 A6 --- GJ Gliese catalog identification 8- 9 I2 h RAh Hour of right ascension (J2000) 11- 12 I2 min RAm Minute of right ascension (J2000) 14- 18 F5.2 s RAs Second of right ascension (J2000) 20 A1 --- DE- Sign of declination (J2000) 21- 22 I2 deg DEd Degree of declination (J2000) 24- 25 I2 arcmin DEm Arcminute of declination (J2000) 27- 31 F5.2 arcsec DEs Arcsecond of declination (J2000) 33- 41 F9.2 mas ePos1 ? Positional error ellipse (major axis) 43- 51 F9.2 mas ePos2 ? Positional error ellipse (minor axis) 53- 55 I3 deg ePosPA ? Positional error ellipse (position angle) 57- 64 F8.2 mas/yr pmRA ? Proper motion along RA 66- 73 F8.2 mas/yr pmDE ? Proper motion along DE 75- 80 F6.2 mas/yr epm1 ? Proper motion error ellipse (major axis) 82- 87 F6.2 mas/yr epm2 ? Proper motion error ellipse (minor axis) 89- 91 I3 deg epmPA ? Proper motion error ellipse (position angle) 93- 98 F6.2 mas pi ? Annual parallax 100-104 F5.2 mas e_pi ? Annual parallax uncertainty 106-112 A7 --- SpType MK spectral type 114-118 F5.2 mag Bmag ? Apparent B-band magnitude 120-124 F5.2 mag Vmag ? Apparent V-band magnitude 126-130 F5.2 [10-7W] logLX ? Log of X-ray luminosity in erg/s
Byte-by-byte Description of file: table2.dat table3.dat
Bytes Format Units Label Explanations
1- 7 A7 --- GJ Gliese catalog identification 9- 16 A8 "YYYYMMDD" Epoch Epoch of observation 18 A1 --- l_Flux Limit flag on Flux 19- 22 I4 uJy Flux Flux density at 5GHz 24- 26 I3 uJy e_Flux ? Flux density uncertainty
History: From electronic version of the journal
(End) Emmanuelle Perret [CDS] 23-Sep-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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