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Limits on Stellar and Planetary Companions in Microlensing Event OGLE-1998-BUL-14


Albrow, MD and Beaulieu, JP and Caldwell, JAR and DePoy, DL and Dominik, M and Gaudi, BS and Gould, A and Greenhill, JG and Hill, KM and Kane, S and Martin, R and Menzies, J and Naber, RM and Pogge, RW and Pollard, KR and Sackett, PD and Sahu, KC and Vermaak, P and Watson, RD and Williams, A, Limits on Stellar and Planetary Companions in Microlensing Event OGLE-1998-BUL-14, The Astrophysical Journal , 535, (1) pp. 176-189. ISSN 0004-637X (2000) [Refereed Article]

DOI: doi:10.1086/308842


We present the PLANET photometric data set for OGLE-1998-BUL-14, a high-magnification (Amax ∼ 16) event alerted by the OGLE collaboration toward the Galactic bulge in 1998. The PLANET data set consists a total of 461 I-band and 139 V-band points, the majority of which was taken over a 3 month period. The median sampling interval during this period is about 1 hr, and the 1 σ scatter over the peak of the event is 1.5%. The excellent data quality and high maximum magnification of this event make it a prime candidate to search for the short-duration, low-amplitude perturbations that are signatures of a planetary companion orbiting the primary lens. The observed light curve for OGLE-1998-BUL-14 is consistent with a single lens (no companion) within photometric uncertainties. We calculate the detection efficiency of the light curve to lensing companions as a function of the mass ratio and angular separation of the two components. We find that companions of mass ratio ≥ 0.01 are ruled out at the 95% significance level for projected separations between 0.4 and 2.4rE, where rE is the Einstein ring radius of the primary lens. Assuming that the primary is a G dwarf with rE ∼ 3 AU, our detection efficiency for this event is ∼60% for a companion with the mass and separation of Jupiter and ∼5% for a companion with the mass and separation of Saturn. Our efficiencies for planets like those around v And and 14 Her are > 75%.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Greenhill, JG (Dr John Greenhill)
UTAS Author:Hill, KM (Dr Kym Hill)
UTAS Author:Kane, S (Dr Stephen Kane)
UTAS Author:Watson, RD (Dr Bob Watson)
ID Code:18578
Year Published:2000
Web of Science® Times Cited:42
Deposited By:Physics
Deposited On:2000-08-01
Last Modified:2011-11-29

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