Limits on the abundance of galactic planets from 5 years of planet observations

Citation
Md. Albrow et al., Limits on the abundance of galactic planets from 5 years of planet observations, ASTROPHYS J, 556(2), 2001, pp. L113-L116
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ASTROPHYSICAL JOURNAL
ISSN journal
0004-637X → ACNP
Volume
556
Issue
2
Year of publication
2001
Part
2
Pages
L113 - L116
Database
ISI
SICI code
0004-637X(20010801)556:2<L113:LOTAOG>2.0.ZU;2-B
Abstract
We search for signatures of planets in 43 intensively monitored microlensin g events that were observed between 1995 and 1999. Planets would be expecte d to cause a short-duration (similar to1 day) deviation on the smooth, symm etric light curve produced by a single lens. We find no such anomalies and infer that less than one-third of the similar to0.3 M. stars that typically comprise the lens population have Jupiter mass companions with semimajor a xes in the range of 1.5 AU < a < 4 AU. Since orbital periods of planets at these radii are 3-15 yr, the outer portion of this region is currently diff icult to probe with any other technique.