J/AJ/161/54 VRI photometry of MOA 2009-BLG-319 (Terry+, 2021)
MOA-2009-BLG-319Lb: a sub-saturn planet inside the predicted mass desert.
Terry S.K., Bhattacharya A., Bennett D.P., Beaulieu J.-P., Koshimoto N.,
Blackman J.W., Bond I.A., Cole A.A., Henderson C.B., Lu J.R.,
Marquette J.B., Ranc C., Vandorou A.
<Astron. J., 161, 54 (2021)>
=2021AJ....161...54T 2021AJ....161...54T
ADC_Keywords: Exoplanets; Gravitational lensing; Photometry, VRI
Keywords: Exoplanets ; Gravitational microlensing ; Computational methods
Abstract:
We present an adaptive optics (AO) analysis of images from the KeckII
telescope NIRC2 instrument of the planetary microlensing event
MOA-2009-BLG-319. The ∼10yr baseline between the event and the Keck
observations allows the planetary host star to be detected at a
separation of 66.5±1.7mas from the source star, consistent with
the light-curve model prediction. The combination of the host star
brightness and light-curve parameters yields host star and planet
masses of Mhost=0.524±0.048M☉ and mp=67.3±6.2M⊕
at a distance of DL=7.1±0.7kpc. The star-planet projected
separation is 2.03±0.21au. The planet-to-star mass ratio of this
system, q=(3.857±0.029)x10-4, places it in the predicted "planet
desert" at 10-4<q<4x10-4 according to the runaway gas accretion
scenario of the core accretion theory. Seven of the 30 planets in the
Suzuki et al. sample fall in this mass ratio range, and this is the
third with a measured host mass. All three of these host stars have
masses of 0.5≲Mhost/M☉≲0.7, which implies that this predicted
mass ratio gap is filled with planets that have host stars within a
factor of two of 1M☉. This suggests that runaway gas accretion
does not play a major role in determining giant planet masses for
stars somewhat less massive than the Sun. Our analysis has been
accomplished with a modified DAOPHOT code that has been designed to
measure the brightness and positions of closely blended stars. This
will aid in the development of the primary method that the Nancy Grace
Roman Space Telescope mission will use to determine the masses of
microlens planets and their hosts.
Description:
MOA-2009-BLG-319 was first alerted by the Microlensing Observations in
Astrophysics (MOA) collaboration on 2009 June 20.
We fit the following data sets: the MOA-II red band; the MOA 0.61m
Boller and Chivens V and I bands; Small and Moderate Aperture Research
Telescope System at Cerro Tololo Inter-American Observatory
(SMARTS-CTIO) V, I, and H bands; the Robonet Faulkes telescope (north
and south) I band; the Liverpool telescope I band; and the Bronberg
Observatory unfiltered data.
Objects:
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RA (2000) DE Designation(s)
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18 06 58.026 -26 49 10.945 MOA 2009-BLG-319 = MOA 2009-BLG-319
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fig1.dat 47 10848 Light curve for MOA 2009-BLG-319
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See also:
J/AJ/106/773 : Mass-luminosity relation (Henry+, 1993)
J/ApJS/101/117 : UBVRIJHKLMNQ photometry in Taurus-Auriga (Kenyon+ 1995)
J/ApJ/725/331 : Astrometry in the Galactic Center (Yelda+, 2010)
J/ApJ/736/19 : Kepler planetary candidates. II. (Borucki+, 2011)
Byte-by-byte Description of file: fig1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Tel Telescope identifier (1)
11- 20 A10 --- Filt Filter identifier
22- 31 F10.5 d JD [4135/6443] Julian Date; JD-2450000.0
33- 39 F7.4 mag mag [7.27/17.1] Apparent magnitude in Filter
41- 47 F7.4 mag e_mag Uncertainty in mag
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Note (1): Telescopes as follows:
Bronberg = Bronberg Observatory, South Africa (93 occurrences)
CTIO = The Small and Moderate Aperture Research Telescope System (SMARTS)
telescope at Cerro Tololo Inter-American Observatory (CTIO) in H0
to H4 filters (705 occurrences)
FT-N = the Robonet Faulkes North telescope in I filter, in Canary Island
(73 occurrences)
FT-S = the Robonet Faulkes South telescope in I filter, in Australia
(259 occurrences)
LiverPool = the Liverpool telescope in I filter, in Spain (131 occurrences)
MOA-II = the Microlensing Observations in Astrophysics in Red and V
filters, in New Zealand (9153 occurrences)
MOA61in = the Mt. John Observatory Boller and Chivens 0.61m telescope in I
and V filters(194 occurrences)
WISE = Wide-field Infrared Survey Explorer in I filter (78 occurrences)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 24-Mar-2021