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The Spitzer Microlensing Program as a Probe for Globular Cluster Planets: Analysis of Ogle-2015-BLG-0448

Poleski, R and Zhu, W and Christie, GW and Udalski, A and Gould, A and Bachelet, E and Skottfelt, J and Novati, SC and Szymanski, MK and Soszynski, I and Pietrzynski, G and Wyrzykowski, L and Ulaczyk, K and Pietrukowicz, P and Kozlowski, S and Skowron, J and Mroz, P and Pawlak, M and Beichman, C and Bryden, G and Carey, S and Fausnaugh, M and Gaudi, BS and Henderson, CB and Pogge, RW and Shvartzvald, Y and Wibking, B and Yee, JC and Beatty, TG and Eastman, JD and Drummond, J and Friedmann, M and Henderson, M and Johnson, JA and Kaspi, S and Maoz, D and McCormick, J and McCrady, N and Natusch, T and Ngan, H and Porritt, I and Relles, HM and Sliski, DH and Tan, T-G and Wittenmyer, RA and Wright, JT and Street, RA and Tsapras, Y and Bramich, DM and Horne, K and Snodgrass, C and Steele, IA and Menzies, J and Jaimes, RF and Wambsganss, J and Schmidt, R and Cassan, A and Ranc, C and Mao, S and Bozza, V and Dominik, M and Hundertmark, MPG and Jorgensen, UG and Andersen, MI and Burgdorf, MJ and Ciceri, S and D'Ago, G and Evans, DF and Gu, S-H and Hinse, TC 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, RT 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. 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 ( ) 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.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society; IOP Publishing
Related URLs:
Date Deposited: 08 May 2017 13:00
Last Modified: 08 May 2017 13:00
DOI or Identification number: 10.3847/0004-637X/823/1/63
URI: http://researchonline.ljmu.ac.uk/id/eprint/6379

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