J/AJ/160/74 Optical and IR photometry of OGLE-2017-BLG-0406 (Hirao+, 2020)
OGLE-2017-BLG-0406: Spitzer microlens parallax reveals Saturn-mass planet
orbiting M-dwarf host in the Inner Galactic Disk.
Hirao Y., Bennett D.P., Ryu Y.-H., Koshimoto N., Udalski A., Yee J.C.,
Sumi T., Bond I.A., Shvartzvald Y., Abe F., Barry R.K., Bhattacharya A.,
Donachie M., Fukui A., Itow Y., Kondo I., Alex Li M.C., Matsubara Y.,
Matsuo T., Miyazaki S., Muraki Y., Nagakane M., Ranc C., Rattenbury N.J.,
Suematsu H., Shibai H., Suzuki D., Tristram P.J., Yonehara A., Skowron J.,
Poleski R., Mroz P., Szymanski M.K., Soszynski I., Kozlowski S.,
Pietrukowicz P., Ulaczyk K., Rybicki K., Iwanek P., Albrow M. D,
Chung S.-J., Gould A., Han C., Hwang K.-H., Jung Y.K., Shin I.-G., Zang W.,
Cha S.-M., Kim D.-J., Kim H.-W., Kim S.-L., Lee C.-U., Lee D.-J., Lee Y.,
Park B.-G., Pogge R.W., Beichman C.A., Bryden G., Novati S.C., Carey S.,
Gaudi B.S., Henderson C.B., Zhu W., Bachelet E., Bolt G., Christie G.,
Hundertmark M., Natusch T., Maoz D., McCormick J., Street R. A, Tan T.-G.,
Tsapras Y., Jorgensen U.G., Dominik M., Bozza V., Skottfelt J.,
Snodgrass C., Ciceri S., Jaimes R.F., Evans D.F., Peixinho N., Hinse T.C.,
Burgdorf M.J., Southworth J., Rahvar S., Sajadian S., Rabus M.,
von Essen C., Fujii Y.I., Campbell- White J., Lowry S., Helling C.,
Mancini L., Haikala L., Kandori R.
<Astron. J., 160, 74 (2020)>
=2020AJ....160...74H 2020AJ....160...74H
ADC_Keywords: Exoplanets; Gravitational lensing; Photometry, UBVRIJKLMNH
Keywords: Gravitational microlensing ;
Gravitational microlensing exoplanet detection
Abstract:
We report the discovery and analysis of the planetary microlensing
event OGLE-2017-BLG-0406, which was observed both from the ground and
by the Spitzer satellite in a solar orbit. At high magnification, the
anomaly in the light curve was densely observed by ground-based-survey
and follow-up groups, and it was found to be explained by a planetary
lens with a planet/host mass ratio of q=7.0x10-4 from the
light-curve modeling. The ground-only and Spitzer-"only" data each
provide very strong one-dimensional (1D) constraints on the 2D
microlens parallax vector πE. When combined, these yield a
precise measurement of πE and of the masses of the host
Mhost=0.56±0.07M_☉ and planet Mplanet=0.41±0.05MJup.
The system lies at a distance DL=5.2±0.5 kpc from the Sun toward
the Galactic bulge, and the host is more likely to be a disk
population star according to the kinematics of the lens. The projected
separation of the planet from the host is a⊥=3.5±0.3au
(i.e., just over twice the snow line). The Galactic-disk kinematics
are established in part from a precise measurement of the source
proper motion based on OGLE-IV data. By contrast, the Gaia
proper-motion measurement of the source suffers from a catastrophic
10σ error.
Description:
The microlensing event OGLE-2017-BLG-0406 was first discovered on
March 27 (HJD'=HJD-2450000=7839) by the Optical Gravitational Lensing
Experiment (OGLE) collaboration. The event lies in the OGLE-IV field
BLG506, and the observations were conducted at the cadence of once per
hour by using the 1.3m Warsaw telescope located at Las Campanas
Observatory in Chile.
The Microlensing Observations in Astrophysics (MOA) group
independently discovered this event on May 5 (HJD'=7879) by using the
MOA alert system. MOA observed this event with 15 minutes cadence by
using MOA-II telescope at Mt. John University Observatory in New
Zealand.
The event was also independently discovered by the Korean Microlensing
Network (KMTNet) survey using its post-season event finder. KMTNet
observes toward the Galactic bulge by using three 1.6m telescopes at
the Cerro Tololo Inter-American Observatory in Chile (CTIO: KMT-C),
and the South African Astronomical Observatory in South Africa (SAAO:
KMT-S). Because this event was in an overlapping region between two
fields (KMTNet BLG02 and BLG42), the observations were conducted at a
15minute cadence.
On June 2 (HJD'=7907), the Microlensing Follow-up Network (µFUN)
collaboration, the Microlensing Network for the Detection of Small
Terrestrial Exoplanet (MiNDSTEp) collaboration and Las Cumbres
Observatory (LCO) global network of telescope collaboration started
high-cadence follow-up observations. µFUN used the following
telescopes: the 1.3m CTIO telescope in Chile, the 0.41m Auckland
telescope and the 0.36m Farm Cove telescope in New Zealand, and the
0.30m Perth Exoplanet Survey Telescope (PEST), and the 0.25m Craigie
telescope in Australia. MiNDSTEp used the 1.54m Danish Telescope at La
Silla Observatory in Chile. LCO used the 1.0m telescopes at CTIO in
Chile and at SSO in Australia.
We also obtained three near-infrared images taken at different epochs
(HJD'∼7911, 7918 and 7942). The observations were made with SIRIUS, a
simultaneous imager in J, H, and KS bands, covering an area 7.7x.7
arcmin2 with a pixel scale of 0.45" on the 1.4m InfraRed Survey
Facility (IRSF) telescope at SAAO.
OGLE-2017-BLG-0406 was observed by the Spitzer space telescope with
the 3.6µm (L-band) channel of the IRAC camera. Spitzer started to
observe this event on June 26 (HJD'=7931).
Objects:
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RA (2000) DE Designation(s)
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17 55 59.92 -29 51 47.3 OGLE-2017-BLG-0406 = EWS 2017-BLG-406
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
auckland.dat 29 82 Observed light curve of OGLE-2017-BLG-0406 from
Auckland in the R band
ctioh.dat 29 92 Observed light curve of OGLE-2017-BLG-0406 from
CTIO in the H band
ctioi.dat 29 21 Observed light curve of OGLE-2017-BLG-0406 from
CTIO in the I band
ctiov.dat 29 7 Observed light curve of OGLE-2017-BLG-0406 from
CTIO in the V band
irsfh.dat 24 3 Observed light curve of OGLE-2017-BLG-0406 from
IRSF in the H band
irsfj.dat 24 3 Observed light curve of OGLE-2017-BLG-0406 from
IRSF in the J band
irsfk.dat 24 3 Observed light curve of OGLE-2017-BLG-0406 from
IRSF in the K band
kmtc02i.dat 23 1558 Observed light curve of OGLE-2017-BLG-0406 from
KMTC02 in the I band
kmtc42i.dat 23 1713 Observed light curve of OGLE-2017-BLG-0406 from
KMTC42 in the I band
kmts02i.dat 23 1903 Observed light curve of OGLE-2017-BLG-0406 from
KMTS02 in the I band
kmts42i.dat 23 2068 Observed light curve of OGLE-2017-BLG-0406 from
KMTS42 in the I band
lcoctio.dat 29 296 Observed light curve of OGLE-2017-BLG-0406 from
LCOCTIO in the I band
lcosso.dat 29 464 Observed light curve of OGLE-2017-BLG-0406 from
LCOSSO in the I band
moar.dat 36 14611 Observed light curve of OGLE-2017-BLG-0406 from
MOA in the Red band
moav.dat 36 315 Observed light curve of OGLE-2017-BLG-0406 from
MOA in the V band
ogle.dat 29 6185 Observed light curve of OGLE-2017-BLG-0406 from
OGLE in the I band
spitzer.dat 30 28 Observed light curve of OGLE-2017-BLG-0406 from
Spitzer in the L band
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See also:
J/ApJ/778/150 : Microlensing events toward the Bulge from MOA-II (Sumi+, 2013)
J/AJ/154/210 : 2015 high-cadence Spitzer microlensing events (Zhu+, 2017)
J/A+A/617/A135 : 20 years of photometric microlensing (Mustill+, 2018)
J/AcA/68/183 : Predicted Microlensing Events for 21st Century (Bramich+,2018)
J/ApJS/244/29 : Microlensing events toward the Galactic bulge (Mroz+, 2019)
J/AJ/159/98 : I-band LC of microlensing event KMT-2016-BLG-1836 (Yang+,2020)
J/AJ/159/116 : I-band light curves of OGLE-2015-BLG-1771Lb (Zhang+, 2020)
Byte-by-byte Description of file: auckland.dat
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Bytes Format Units Label Explanations
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1- 12 F12.7 d JD Epoch, Julian Date, JD-2450000.0
14- 21 F8.5 mag mag Observed magnitude
23- 29 F7.5 mag e_mag Uncertainty in mag
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Byte-by-byte Description of file: ctio[hiv].dat
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Bytes Format Units Label Explanations
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1- 12 F12.7 d JD Epoch, Julian Date, JD-2450000.0
14- 21 F8.5 mag mag Observed magnitude
23- 29 F7.5 mag e_mag Uncertainty in mag
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Byte-by-byte Description of file: irsf[hjk].dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d JD Epoch, Julian Date, JD-2450000.0
13- 18 F6.3 mag mag Observed magnitude
20- 24 F5.3 mag e_mag Uncertainty in mag
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Byte-by-byte Description of file: kmt[cs][04]2i.dat
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Bytes Format Units Label Explanations
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1- 10 F10.5 d JD Epoch, Julian Date, JD-2450000.0
12- 17 F6.3 mag mag Observed magnitude
19- 23 F5.3 mag e_mag Uncertainty in mag
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Byte-by-byte Description of file: lcoctio.dat
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Bytes Format Units Label Explanations
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1- 12 F12.7 d JD Epoch, Julian Date, JD-2450000.0
14- 21 F8.5 mag mag Observed magnitude
23- 29 F7.5 mag e_mag Uncertainty in mag
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Byte-by-byte Description of file: lcosso.dat
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Bytes Format Units Label Explanations
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1- 12 F12.7 d JD Epoch, Julian Date, JD-2450000.0
14- 21 F8.5 mag mag Observed magnitude
23- 29 F7.5 mag e_mag Uncertainty in mag
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Byte-by-byte Description of file: moa[rv].dat
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Bytes Format Units Label Explanations
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1- 13 F13.8 d JD Epoch, Julian Date, JD-2450000.0
15- 26 F12.4 --- mag Relative flux
28- 36 F9.4 --- e_mag Uncertainty in mag
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Byte-by-byte Description of file: ogle.dat
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Bytes Format Units Label Explanations
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1- 12 F12.7 d JD Epoch, Julian Date, JD-2450000.0
14- 21 F8.5 mag mag Observed magnitude
23- 29 F7.5 mag e_mag Uncertainty in mag
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Byte-by-byte Description of file: spitzer.dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d JD Epoch, Julian Date, JD-2450000.0
13- 20 F8.5 mag mag Relative flux
22- 30 F9.7 mag e_mag Uncertainty in mag
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 04-Dec-2020