J/MNRAS/414/108 Calibrator of exoplanet-host stars (Beust+, 2011)
On the use of the Virtual Observatory to select calibrators for phase-referenced
astrometry of exoplanet-host stars.
Beust H., Bonneau D., Mourard D., Lafrasse S., Mella G., Duvert G.,
Chelli A.
<Mon. Not. R. Astron. Soc., 414, 108-115 (2011)>
=2011MNRAS.414..108B 2011MNRAS.414..108B
ADC_Keywords: Stars, double and multiple ; Planets ; Finding lists
Keywords: techniques: interferometric - astronomical data bases: miscellaneous -
astrometry - proper motions - planetary systems
Abstract:
Phase-referenced interferometric astrometry offers the possibility to
look for exoplanets around bright stars. Instruments like PRIMA
(Phase-Referenced Imaging and Micro-arcsecond Astrometry) will measure
the astrometric wobble of a candidate star due to an exoplanet
relative to a close-by 'calibrator' star, located within the
instrument's observing field (1-arcmin in the PRIMA case). Stars with
already known exoplanets will constitute the first targets for this
technique, as it will provide a way to further specify the
characteristics of the known exoplanets, such as the inclinations. The
main requirement is to have a calibrator in the vicinity of the star.
We provide here a list of calibrators for all stars with known
exoplanets obtained using data mining and Virtual Observatory
techniques. This list is available online and revised regularly. The
calibrators are found from catalogues available at Centre de Donnees
astronomiques de Strasbourg (CDS) using the SearchCal software
developed at Jean-Marie Mariotti Center (JMMC). In our test case, the
calibrators are found within 1 arcmin angular distance for
approximately 50 per cent of the stars tested, and often closer. They
are all faint objects from the Two Micron All Sky Survey (2MASS) with
K magnitudes between 13 and 15. A list of the most promising targets
is also given.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 81 203 List of all exoplanet-host stars
table4.dat 121 582 List of accepted calibrators found by SearchCal
for all exoplanet-host stars on 2010 December 6
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Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Star Exoplanet-host star name
17- 18 I2 h RAh Star right ascension (J2000)
20- 21 I2 min RAm Star right ascension (J2000)
23- 29 F7.4 s RAs Star right ascension (J2000)
31 A1 --- DE- Star declination sign (J2000)
32- 33 I2 deg DEd Star declination (J2000)
35- 36 I2 arcmin DEm Star declination (J2000)
38- 43 F6.3 arcsec DEs Star declination (J2000)
45- 52 F8.2 mas/yr pmRA ?=- Star proper motion along RA
54- 60 F7.2 mas/yr pmDE ?=- Star proper motion along DE
62- 67 F6.2 mas plx ? Star parallax
69- 74 E6.3 mas Size ? Size of astrometric orbit
76- 81 F6.3 mag Kmag ? Star K magnitude
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Star Exoplanet-host star name
17- 34 A18 --- Calib Calibrator name
36- 37 I2 h RAh Calibrator right ascension (J2000)
39- 40 I2 min RAm Calibrator right ascension (J2000)
42- 47 F6.3 s RAs Calibrator right ascension (J2000)
49 A1 --- DE- Calibrator declination sign (J2000)
50- 51 I2 deg DEd Calibrator declination (J2000)
53- 54 I2 arcmin DEm Calibrator declination (J2000)
56- 60 F5.2 arcsec DEs Calibrator declination (J2000)
62- 69 F8.3 mas/yr pmRA ?=- Calibrator proper motion along RA
70- 76 F7.2 mas/yr pmDE ?=- Calibrator proper motion along DE
78- 83 F6.3 mag Kmag Calibrator K magnitude
85- 91 F7.5 arcmin Dist0 Calibrator distance in 2000.0
93- 99 F7.5 arcmin Dist2 Calibrator distance in 2020.0
101-107 F7.5 arcmin Distm [0/1]? Minimum distance (in Datem)
109-110 A2 --- --- [in]
112-121 F10.4 yr Datem [-8450/22666]? Date for Distm
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 09-Jan-2012