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Aparna Bhattacharya
Researcher at Goddard Space Flight Center
Publications - 244
Citations - 4984
Aparna Bhattacharya is an academic researcher from Goddard Space Flight Center. The author has contributed to research in topics: Gravitational microlensing & Planet. The author has an hindex of 35, co-authored 218 publications receiving 4255 citations. Previous affiliations of Aparna Bhattacharya include Max Planck Society & University of Notre Dame.
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Journal ArticleDOI
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
Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars. VI. Age and abundance structure of the stellar populations in the central sub-kpc of the Milky Way
Thomas Bensby,Sofia Feltzing,Andrew Gould,Andrew Gould,Andrew Gould,Jennifer C. Yee,Jennifer A. Johnson,Martin Asplund,Jorge Melendez,Sara Lucatello,L. M. Howes,Andrew McWilliam,Andrzej Udalski,Michał K. Szymański,Igor Soszyński,Radosław Poleski,Radosław Poleski,A. Wyrzykowski,Krzysztof Ulaczyk,Krzysztof Ulaczyk,S. Kozlowski,P. Pietrukowicz,Jan Skowron,P. Mróz,J. M. Pawlak,Fumio Abe,Yuichiro Asakura,Aparna Bhattacharya,Ian A. Bond,David P. Bennett,Yuki Hirao,Masayuki Nagakane,Naoki Koshimoto,Takahiro Sumi,Daisuke Suzuki,P. J. Tristram +35 more
TL;DR: In this paper, a detailed elemental abundance study of 90 F and G dwarfs, turn-off, and subgiant stars in the Galactic bulge has been presented, based on high-resolution spectra acquired during gravitational microlensing events.
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 frequency of snowline-region planets from four-years of OGLE-MOA-Wise second-generation microlensing.
Yossi Shvartzvald,D. Maoz,Andrzej Udalski,Takahiro Sumi,M. Friedmann,Shai Kaspi,Radosław Poleski,Michał K. Szymański,Jan Skowron,S. Kozlowski,Łukasz Wyrzykowski,P. Mróz,P. Pietrukowicz,Grzegorz Pietrzyński,Igor Soszyński,Krzysztof Ulaczyk,Fumio Abe,Richard K. Barry,David P. Bennett,Aparna Bhattacharya,Ian A. Bond,M. Freeman,K. Inayama,Yoshitaka Itow,Naoki Koshimoto,C. H. Ling,Kimiaki Masuda,Akihiko Fukui,Yutaka Matsubara,Yasushi Muraki,K. Ohnishi,Nicholas J. Rattenbury,T. Saito,Denis J. Sullivan,Daisuke Suzuki,P. J. Tristram,Y. Wakiyama,Atsunori Yonehara +37 more
TL;DR: A "second-generation" microlensing survey for extrasolar planets, consisting of near-continuous time coverage by the OGLE, MOA, and Wise surveys, suggests a minimum in the distribution in the super-Jupiter mass range, and a relatively high occurrence of brown-dwarf companions.