MOA-2011-BLG-262Lb: A Sub-Earth-Mass Moon Orbiting a Gas Giant Primary or a High Velocity Planetary System in the Galactic Bulge
David P. Bennett,V. Batista,Ian A. Bond,C. S. Bennett,C. S. Bennett,Daisuke Suzuki,J. P. Beaulieu,Andrzej Udalski,J. Donatowicz,Valerio Bozza,Valerio Bozza,Fumio Abe,C. S. Botzler,M. Freeman,D. Fukunaga,Akihiko Fukui,Yoshitaka Itow,Naoki Koshimoto,C. H. Ling,Kimiaki Masuda,Yutaka Matsubara,Yasushi Muraki,S. Namba,Kouji Ohnishi,Nicholas J. Rattenbury,To. Saito,Denis J. Sullivan,Takahiro Sumi,Winston L. Sweatman,Paul J. Tristram,N. Tsurumi,K. Wada,Philip Yock,Michael D. Albrow,Etienne Bachelet,S. Brillant,J. A. R. Caldwell,Arnaud Cassan,Andrew A. Cole,E. Corrales,C. Coutures,S. Dieters,D. Dominis Prester,Pascal Fouqué,J. G. Greenhill,Keith Horne,J.-R. Koo,D. Kubas,J. B. Marquette,R. Martin,J. W. Menzies,Kailash C. Sahu,Joachim Wambsganss,Andrew Williams,M. Zub,J.-Y. Choi,Darren L. DePoy,Subo Dong,B. S. Gaudi,Andrew Gould,Chang S. Han,Calen B. Henderson,D. McGregor,C.-U. Lee,Richard W. Pogge,I.-G. Shin,Jennifer C. Yee,Jennifer C. Yee,Michał K. Szymański,Jan Skowron,Radek Poleski,Radek Poleski,S. Kozllowski,Lukasz Wyrzykowski,M. Kubiak,Paweł Pietrukowicz,Grzegorz Pietrzyński,Grzegorz Pietrzyński,Igor Soszyński,Krzysztof Ulaczyk,Yiannis Tsapras,Yiannis Tsapras,Rachel Street,Martin Dominik,Martin Dominik,D. M. Bramich,P. Browne,M. Hundertmark,N. Kains,Colin Snodgrass,Iain A. Steele,I. Dékány,Oscar A. Gonzalez,D. Heyrovsky,Ryo Kandori,Eamonn Kerins,P. W. Lucas,Dante Minniti,Takahiro Nagayama,Marina Rejkuba,Annie C. Robin,R. Saito +101 more
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In this paper, the first microlensing candidate for a free-floating exoplanet-exomoon system, MOA-2011-BLG-262, with a primary lens mass of M host ~ 4 Jupiter masses hosting a sub-Earth mass moon was presented.Abstract:
We present the first microlensing candidate for a free-floating exoplanet-exomoon system, MOA-2011-BLG-262, with a primary lens mass of M host ~ 4 Jupiter masses hosting a sub-Earth mass moon. The argument for an exomoon hinges on the system being relatively close to the Sun. The data constrain the product ML πrel where ML is the lens system mass and πrel is the lens-source relative parallax. If the lens system is nearby (large πrel), then ML is small (a few Jupiter masses) and the companion is a sub-Earth-mass exomoon. The best-fit solution has a large lens-source relative proper motion, μrel = 19.6 ± 1.6 mas yr–1, which would rule out a distant lens system unless the source star has an unusually high proper motion. However, data from the OGLE collaboration nearly rule out a high source proper motion, so the exoplanet+exomoon model is the favored interpretation for the best fit model. However, there is an alternate solution that has a lower proper motion and fits the data almost as well. This solution is compatible with a distant (so stellar) host. A Bayesian analysis does not favor the exoplanet+exomoon interpretation, so Occam's razor favors a lens system in the bulge with host and companion masses of and , at a projected separation of AU. The existence of this degeneracy is an unlucky accident, so current microlensing experiments are in principle sensitive to exomoons. In some circumstances, it will be possible to definitively establish the mass of such lens systems through the microlensing parallax effect. Future experiments will be sensitive to less extreme exomoons.read more
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The exoplanet mass-ratio function from the moa-ii survey: discovery of a break and likely peak at a neptune mass
Daisuke Suzuki,David P. Bennett,David P. Bennett,Takahiro Sumi,Ian A. Bond,Leslie A. Rogers,Fumio Abe,Yuichiro Asakura,Aparna Bhattacharya,Aparna Bhattacharya,Martin Donachie,M. Freeman,Akihiko Fukui,Yuki Hirao,Yoshitaka Itow,Naoki Koshimoto,Man Cheung Alex Li,C. H. Ling,Kimiaki Masuda,Yutaka Matsubara,Yasushi Muraki,Masayuki Nagakane,K. Onishi,H. Oyokawa,Nicholas J. Rattenbury,To. Saito,A. Sharan,Hiroshi Shibai,Denis J. Sullivan,Paul J. Tristram,Atsunori Yonehara +30 more
TL;DR: In this article, the authors report the results of the statistical analysis of planetary signals discovered in MOA-II microlensing survey alert system events from 2007 to 2012, and determine the survey sensitivity as a function of planet star mass ratio, q, and projected planet star separation, s, in Einstein radius units.
Journal ArticleDOI
Detecting Earth-Mass Planets with Gravitational Microlensing
TL;DR: In this paper, it was shown that Earth mass planets orbiting stars in the Galactic disk and bulge can be detected by monitoring microlensed stars in a Galactic bulge, and that the planetary signal remains detectable for planetary masses as small as an Earth mass when realistic source star sizes are included in the lightcurve calculation.
Journal ArticleDOI
Confirmation of the Ogle-2005-Blg-169 Planet Signature and Its Characteristics with Lens-Source Proper Motion Detection
V. Batista,J. P. Beaulieu,David P. Bennett,Andrew Gould,J. B. Marquette,Akihiko Fukui,Aparna Bhattacharya +6 more
TL;DR: For the first time, the source and the lens of OGLE-2005-BLG-169Lb were completely resolved, providing a precise measurement of their heliocentric relative proper motion as mentioned in this paper.
Journal ArticleDOI
Confirmation of the planetary microlensing signal and star and planet mass determinations for event ogle-2005-blg-169
David P. Bennett,Aparna Bhattacharya,Joseph M. Anderson,Ian A. Bond,N. Anderson,Richard Barry,V. Batista,J.-P. Beaulieu,Darren L. DePoy,Subo Dong,B. S. Gaudi,Emily A. Gilbert,Andrew Gould,R. Pfeifle,Richard W. Pogge,Daisuke Suzuki,Sean K. Terry,Andrzej Udalski +17 more
TL;DR: The OGLE-2005-BLG-169Lb planetary system is located toward the Galactic bulge at a distance of 4.4$ kpc and the projected star-planet separation is 3.3$ AU as discussed by the authors.
Journal ArticleDOI
The Hunt for Exomoons with Kepler (HEK): IV. A Search for Moons around Eight M-Dwarfs
David M. Kipping,David Nesvorny,Lars A. Buchhave,Joel D. Hartman,Gáspár Á. Bakos,Allan R. Schmitt +5 more
TL;DR: In this article, the authors present results from a survey focussing on eight Kepler planetary candidates associated with M-dwarfs using photodynamical modeling and Bayesian multimodal nested sampling, finding no compelling evidence for exomoon in these eight systems.
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