J/AcA/71/1 OGLE wide-orbit exoplanets (Poleski+, 2021)
Wide-orbit exoplanets are common.
Analysis of nearly 20 years of OGLE microlensing survey data.
Poleski R., Skowron J., Mroz P., Udalski A., Szymamski M.K.,
Pietrukowicz P., Ulaczyk K., Rybicki K., Iwanek P., Wrona M., Gromadzki M.
<Acta Astron., 71, 1-23 (2021)>
=2021AcA....71....1P 2021AcA....71....1P (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Optical
Keywords: gravitational lensing: micro - planetary systems
Abstract:
We use nearly 20yr of photometry obtained by the OGLE survey to
measure the occurrence rate of wide-orbit (or ice giant) microlensing
planets, i.e.,with separations from ∼5a.u. to ∼15a.u. and
mass-ratios from 10-4 to 0.033. In a sample of 3112 events we find
six previously known wideorbit planets and a new microlensing planet
or brown dwarf OGLE-2017-BLG-0114Lb, for which close and wide orbits
are possible and close orbit is preferred. We run extensive
simulations of the planet detection efficiency, robustly taking into
account the finite-source effects. We find that the extrapolation of
the previously measured rate of microlensing planets significantly
under-predicts the number of wide-orbit planets. On average, every
microlensing star hosts 1.4+0.9_-0.6^ ice giant planets.
Description:
We analyze data from the third and the fourth phases of the OGLE
survey (OGLE-III and OGLE-IV, respectively).
We analyze the fields with at least 300 epochs, which limits the
sample to 88 OGLE-III fields and 85 OGLE-IV fields. The largest number
of epochs is 2500 and 16000 in the OGLE-III and OGLE-IV data,
respectively. We give details of the analyzed fields in the table.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fields.dat 50 173 Information on fields studied
events.dat 189 3112 List of microlensing events analyzed
det_eff.dat 28 420 Detection efficiency
postdef.dat 38 2000 Posterior samples for default selection criteria
postdefa.dat 38 2000 Posterior samples for default selection criteria
and assuming wide-orbit solution for
OGLE-2017-BLG-0114
postext.dat 38 2000 Posterior samples for extended selection criteria
postexta.dat 38 2000 Posterior samples for extended selection criteria
and assuming wide-orbit solution for
OGLE-2017-BLG-0114
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See also:
http://ogle.astrouw.edu.pl/ogle/ogle4/planets : OGLE4 planets home page
Byte-by-byte Description of file: fields.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Name Name of the field (BLGNNN)
8- 9 I2 h RAh Right Ascension (J2000)
11- 12 I2 min RAm Right Ascension (J2000)
14- 17 F4.1 s RAs Right Ascension (J2000)
19 A1 --- DE- Declination sign (J2000)
20- 21 I2 deg DEd Declination (J2000)
23- 24 I2 arcmin DEm Declination (J2000)
26- 27 I2 arcsec DEs Declination (J2000)
29 A1 --- OGLEphase [3/4] OGLE phase: 3 or 4
31- 37 F7.2 d DeltaTime Total time of observations
39- 43 I5 --- Nepochs Number of epochs
45- 50 F6.4 d MedianDT Median time difference between
consecutive epochs
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Byte-by-byte Description of file: events.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Name Event name (BLGNNNNNNNNNN)
18- 19 I2 h RAh Right Ascension (J2000)
21- 22 I2 min RAm Right Ascension (J2000)
24- 28 F5.2 s RAs Right Ascension (J2000)
30 A1 --- DE- Declination sign (J2000)
31- 32 I2 deg DEd Declination (J2000)
34- 35 I2 arcmin DEm Declination (J2000)
37- 40 F4.1 arcsec DEs Declination (J2000)
42 I1 --- OGLEphase Phase of OGLE project: 3 or 4
44- 61 A18 --- EWSid ID on EWS website or "-" if not announced
there (OGLE-YYYY-BLG-NNN)
63- 67 I5 --- Nepochs Number of epochs
69- 76 F8.5 --- chi2dof Chi2 per number of degrees of freedom
78- 90 F13.5 --- t0 HJD of minimum separation
92-100 F9.6 --- u0 Impact parameter relative to theta_E
102-111 F10.6 d tE Einstein ring crossing time
113-120 F8.5 --- piEN North component of microlensing parallax
122-129 F8.5 --- piEE East component of microlensing parallax
131-137 I7 --- t0par HJD of parameter reference epoch
139-144 F6.3 mag Ibase ?=0 Baseline brightness in I band
146-151 F6.3 mag Isource ?=0 Source brightness in I band
153-158 F6.3 mag IRC ?=0 Red clump brightness in I band
160 A1 --- f_IRC [Nf-] Flag for IRC (1)
162-169 F8.6 --- rho Source radius relative to theta_E
171-178 F8.6 --- e_rho Error on rho (lower value)
180-187 F8.6 --- E_rho Error on rho (upper value)
189 A1 --- f_rho [mf-] Flag for rho (2)
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Note (1): Flag as follows:
N = value from Nataf et al. (2013ApJ...769...88N 2013ApJ...769...88N)
f = value fitted by the authors
- = no data
Note (2): Flag as follows:
m = value from Galactic model
f = value from microlensing fit
- = no data
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Byte-by-byte Description of file: det_eff.dat
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Bytes Format Units Label Explanations
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1- 3 F3.1 --- s Projected separation relative to
Einstein ring radius
5- 12 F8.6 --- q Mass-ratio
14- 20 F7.3 --- SensDefault Survey sensitivity for default detection
criteria (Fig. 6 of the paper)
22- 28 F7.3 --- SensExtend Survey sensitivity for extended detection
criteria
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Byte-by-byte Description of file: post*.dat
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Bytes Format Units Label Explanations
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1- 8 F8.6 --- A Multiplicative constant
10- 18 F9.6 --- n Exponent of s
20- 28 F9.6 --- m Exponent of q
30- 38 F9.6 --- log10(prior) Log10 of prior probability
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History:
Copied at http://ogle.astrouw.edu.pl/ogle/ogle4/planets/wide_orbit_rate/
(End) Patricia Vannier [CDS] 29-May-2023