The spitzer microlensing program as a probe for globular cluster planets: analysis of OGLE-2015-BLG-0448

Poleski, Radoslaw and Zhu, Wei and Christie, Grant W. and Udalski, Andrzej and Gould, Andrew and Bachelet, Etienne and Skottfelt, Jesper and Novati, Sebastiano Calchi and Szymanski, M. K. and Soszynski, L. and Pietrzynski, G. and Wyrzykowski, L. and Ulaczyk, K. and Pietrukowicz, P. and Kozlowski, Szymon and Skowron, J. and Mroz, P. and Pawlak, M. and Beichman, C. and Bryden, G. and Carey, S. and Fausnaugh, M. and Gaudi, B. S. and Henderson, C. B. and Pogge, R. W. and Shvartzvald, Y. and Wibking, B. and Yee, J. C. and Beatty, T. G. and Eastman, J. D. and Drummond, J. and Friedmann, M. and Henderson, M. and Johnson, J. A. and Kaspi, S. and Maoz, D. and McCormick, J. and McCrady, N. and Natusch, T. and Ngan, H. and Porritt, I. and Relles, H. M. and Sliski, D. H. and Tan, T.-G. and Wittenmyer, R. A. and Wright, J. T. and Street, R. A. and Tsapras, Y. and Bramich, D. M. and Horne, K. and Snodgrass, C. and Steele, I. A. and Menzies, J. and Figuera Jaimes, R. and Wambsganss, J. and Schmidt, R. and Cassan, A. and Ranc, C. and Mao, S. and Bozza, V. and Dominik, M. and Hundertmark, M. P. G. and Jorgensen, U. G. and Andersen, M. I. and Burgdorf, M. J. and Ciceri, S. and D’Ago, G. and Evans, D. F. and Gu, S.-H. and Hinse, T. C. and Kains, N. and Kerins, E. and Korhonen, H. and Kuffmeier, M. and Mancini, L. and Popovas, A. and Rabus, M. and Rahvar, S. and Rasmussen, R. T. and Scarpetta, G. and Southworth, J. and Surdej, J. and Unda-Sanzana, E. and Verma, P. and von Essen, C. and Wang, Y.-B. and Wertz, O. (2016) The spitzer microlensing program as a probe for globular cluster planets: analysis of OGLE-2015-BLG-0448. The Astrophysical Journal, 823 (1). ISSN 0004-637X

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Abstract

The microlensing event OGLE-2015-BLG-0448 was observed by Spitzer and lay within the tidal radius of the
globular cluster NGC 6558. The event had moderate magnification and was intensively observed, hence it had the potential to probe the distribution of planets in globular clusters. We measure the proper motion of NGC 6558
(mcl (N, E) = (+0.36 +/- 0.10, +1.42 +/- 0.10) mas yr-1) as well as the source and show that the lens is not a
cluster member. Even though this particular event does not probe the distribution of planets in globular clusters,
other potential cluster lens events can be verified using our methodology. Additionally, we find that microlens
parallax measured using Optical Gravitational Lens Experiment (OGLE) photometry is consistent with the value
found based on the light curve displacement between the Earth and Spitzer.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version made accessible, in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 07 Apr 2017 02:09
Last Modified: 07 Apr 2017 02:09
Uncontrolled Keywords: globular clusters; NGC6558; gravitational lensing; planets and satellites detection; proper motions
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.3847/0004-637X/823/1/63
URI: http://eprints.usq.edu.au/id/eprint/30721

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