January 1999 • Volume 16, Number 1 SPACE TELESCOPE SCIENCE INSTITUTE Highlights of this Issue: • Hubble Heritage Project — page 19 • Starburst99 Synthesis Models — page 21 • The Last Days of NICMOS Newsletter — page 32 The PLANET Project: study of unseen lenses, stars and extra-solar planets through microlensing Kailash C. Sahu, STScI
[email protected] he idea of microlensing is not The microlensing survey programs Cycle 8 new. More than half a century have an ‘Alert’ capability that has T ago, Einstein wrote a small opened the possibility of carrying out paper in Science where he did ‘a little independent follow-up study of the Who got time on HST to do what ... calculation’ at the request of R.W. microlensing events while the events Mandal, and showed that if a star are in progress. Now, at any given time How the selection process works ... happens to pass very close to another during the months when the Galactic star in the line of sight, then the Bulge is up in the sky, there are background star will be lensed. typically 10 or more microlensing A new RPS2 for Cycle 8 ... However, he also dismissed the idea as events in progress, so it is possible to only a theoretical exercise and even plan and dedicate some telescope A new Phase II ... remarked that there was ‘no hope of time to carry out such follow up observing such a phenomenon directly’ studies of the microlensing events. since the probability of observing is Approved less than one in a million. Science with microlensing Times have changed.