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The Spitzer Microlensing Program As A Probe For Globular Cluster Planets: Analysis Of Ogle-2015-BLG-0448

Poleski, Radosław; Zhu, Wei; Christie, Grant W.; Udalski, Andrzej; Gould, Andrew; Bachelet, Etienne; Skottfelt, Jesper; Calchi Novati, Sebastiano; Szymański, M.K.; Soszyński, I.; Pietrzyński, G.; Wyrzykowski, Ł.; Ulaczyk, K.; Pietrukowicz, P.; Kozłowski, Szymon; Skowron, J.; Mróz, P.; Pawlak, M.; Beichman, C.; Bryden, G.; Carey, S.; Fausnaugh, M.; Gaudi, B.S.; Henderson, C.B.; Pogge, R.W.; Shvartzvald, Y.; Wibking, B.; Yee, J.C.; Beatty, T.G.; Eastman, J.D.; Drummond, J.; Friedmann, M.; Henderson, M.; Johnson, J.A.; Kaspi, S.; Maoz, D.; McCormick, J.; McCrady, N.; Natusch, T.; Ngan, H.; Porritt, I.; Relles, H.M.; Sliski, D.H.; Tan, T.-G.; Wittenmyer, R.A.; Wright, J.T.; Street, R.A.; Tsapras, Y.; Bramich, D.M.; Horne, K.; Snodgrass, C.; Steele, I.A.; Menzies, J.; Figuera Jaimes, R.; Wambsganss, J.; Schmidt, R.; Cassan, A.; Ranc, C.; Mao, S.; Bozza, V.; Dominik, M.; Hundertmark, M.P.G.; Jørgensen, U.G.; Andersen, M.I.; Burgdorf, M.J.; Ciceri, S.; D'Ago, G.; Evans, D.F.; Gu, S.-H.; Hinse...

The Spitzer Microlensing Program As A Probe For Globular Cluster Planets: Analysis Of Ogle-2015-BLG-0448 Thumbnail


Radosław Poleski

Wei Zhu

Grant W. Christie

Andrzej Udalski

Andrew Gould

Etienne Bachelet

Jesper Skottfelt

Sebastiano Calchi Novati

M.K. Szymański

I. Soszyński

G. Pietrzyński

Ł. Wyrzykowski

K. Ulaczyk

P. Pietrukowicz

Szymon Kozłowski

J. Skowron

P. Mróz

M. Pawlak

C. Beichman

G. Bryden

S. Carey

M. Fausnaugh

B.S. Gaudi

C.B. Henderson

R.W. Pogge

Y. Shvartzvald

B. Wibking

J.C. Yee

T.G. Beatty

J.D. Eastman

J. Drummond

M. Friedmann

M. Henderson

J.A. Johnson

S. Kaspi

D. Maoz

J. McCormick

N. McCrady

T. Natusch

H. Ngan

I. Porritt

H.M. Relles

D.H. Sliski

T.-G. Tan

R.A. Wittenmyer

J.T. Wright

R.A. Street

Y. Tsapras

D.M. Bramich

K. Horne

C. Snodgrass

I.A. Steele

J. Menzies

R. Figuera Jaimes

J. Wambsganss

R. Schmidt

A. Cassan

C. Ranc

S. Mao

V. Bozza

M. Dominik

M.P.G. Hundertmark

U.G. Jørgensen

M.I. Andersen

M.J. Burgdorf

S. Ciceri

G. D'Ago

D.F. Evans

S.-H. Gu

T.C. Hinse

N. Kains

E. Kerins

H. Korhonen

M. Kuffmeier

L. Mancini

A. Popovas

M. Rabus

S. Rahvar

R.T. Rasmussen

G. Scarpetta

J. Surdej

E. Unda-Sanzana

P. Verma

C. von Essen

Y.-B. Wang

O. Wertz


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 (${{\boldsymbol{\mu }}}_{\mathrm{cl}}(N,E)=(+0.36\pm 0.10,+1.42\pm 0.10)\;{\rm{mas}}\;{{\rm{yr}}}^{-1}$) 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.


Poleski, R., Zhu, W., Christie, G. W., Udalski, A., Gould, A., Bachelet, E., …Wertz, O. (in press). The Spitzer Microlensing Program As A Probe For Globular Cluster Planets: Analysis Of Ogle-2015-BLG-0448. Astrophysical Journal, 823(1), Article 63.

Journal Article Type Article
Acceptance Date Mar 20, 2016
Online Publication Date May 23, 2016
Journal Astrophysical Journal
Print ISSN 0004-637X
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 823
Issue 1
Article Number 63
Keywords globular clusters, individual (NGC6558), gravitational lensing, micro, planets and satellites, detection, proper motions
Publisher URL


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