J/other/Nat/481.167 2002-2007 PLANET microlensing events (Assan+, 2012)
One or more bound planets per Milky Way star from microlensing observations.
Cassan A., Kubas D., Beaulieu J.-P., Dominik M., Horne K., Greenhill J.,
Wambsganss J., Menzies J., Williams A., Jorgensen U., Bennett D.P.,
Albrow M.D., Batista V., Brillant S., Caldwell J.A.R., Cole A., Coutures C.,
Cook H., Dieters S., Prester D.D., Donatowicz J., Fouque P., Hill K.,
Kains N., Kane S., Marquette J.-B., Martin R., Pollard K.R., Sahu K.C.,
Vinter C., Warren D., Watson B., Zub M., Sumi T., Szymanski M.K., Kubiak M.,
Poleski R., Soszynski I., Ulaczyk K., Pietrzynski G., Wyrzykowski L.
<Nature, 481, 167-169 (2012)>
=2012Natur.481..167C 2012Natur.481..167C
ADC_Keywords: Gravitational lensing ; Stars, variable ; Milky Way ; Magnitudes
Keywords: astronomy - astrophysics - planetary sciences
Abstract:
Most known extrasolar planets (exoplanets) have been discovered using
the radial velocity or transit methods. Both are biased towards
planets that are relatively close to their parent stars, and studies
find that around 17-30% of solar-like stars host a planet.
Gravitational microlensing on the other hand, probes planets that are
further away from their stars. Recently, a population of planets that
are unbound or very far from their stars was discovered by
microlensing. These planets are at least as numerous as the stars in
the Milky Way. Here we report a statistical analysis of microlensing
data (gathered in 2002-07) that reveals the fraction of bound planets
0.5-10AU (Sun-Earth distance) from their stars. We find that of
stars host Jupiter-mass planets (0.3-10MJ, where MJ=318M{earth}
and M{earth} is Earth's mass). Cool Neptunes (10-30M{earth}) and
super-Earths (5-10M{earth}) are even more common: their respective
abundances per star are 52+22-29% and 62+35-37%. We conclude
that stars are orbited by planets as a rule, rather than the
exception.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tables1.dat 54 196 List of events followed by PLANET from 2002-2007
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See also:
J/AcA/50/1 : OGLE microlensing events in Galactic Bulge (Udalski+, 2000)
J/AcA/51/175 : OGLE-II DIA microlensing events (Wozniak+, 2001)
J/MNRAS/343/1131 : 1998-2000 OGLE events microlensing limits (Tsapras+, 2003)
J/ApJ/631/906 : MACHO Galactic Bulge microlensing events (Thomas+, 2005)
J/ApJ/636/240 : OGLE II microlensing parameters (Sumi+, 2006)
J/A+A/454/185 : EROS-2 microlensing parameters (Hamadache+, 2006)
J/ApJ/711/L48 : 2008 OGLE Bulge microlensing alerts (Cohen+, 2010)
J/A+A/512/A41 : Abundances of microlensed stars in the Bulge (Bensby+, 2010)
J/A+A/533/A134 : Abundances of microlensed stars in the Bulge (Bensby+, 2011)
J/A+A/549/A147 : Abundances of microlensed stars in the Bulge (Bensby+, 2013)
Byte-by-byte Description of file: tables1.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Event Event name (OGLE-YYYY-BLG-NNN)
19- 20 I2 h RAh Right ascension (J2000)
22- 23 I2 min RAm Right ascension (J2000)
25- 29 F5.2 s RAs Right ascension (J2000)
31 A1 --- DE- Declination sign (J2000)
32- 33 I2 deg DEd Declination (J2000)
35- 36 I2 arcmin DEm Declination (J2000)
38- 41 F4.1 arcsec DEs Declination (J2000)
43- 46 F4.1 mag I0 Baseline magnitude
48- 52 F5.1 d tE Einstein radius crossing time scale
54 A1 --- Note [*] * indicates events of the reference season
2004 for which detection efficiencies
were computed
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 08-Nov-2013