Sentences with phrase «-2017-blg-1522 microlensing event»

The details of this particular microlensing event, the fourth the team has detected looking towards the LMC, have not yet been published.

The astronomers are most excited by the microlensing events associated with stars in the LMC, and described the first three of these events in the 10 April issue of Physical Review Letters (vol 74, p 2867).

The team has also found evidence to silence a minority of sceptics who argue that what most astronomers take to be microlensing events are actually caused by natural variations in the intrinsic brightness of the stars being observed.

Mike Turner of Fermilab, Chicago, has already pointed out that the observed microlensing events seem to be too rare to fit the idea of a dark halo full of brown dwarfs.

The Optical Gravitational Lensing Experiment (OGLE) observes millions of stars every night with telescopes in Chile to find microlensing events.

The 2008 and 2010 events are part of the OGLE database, which contains 13,000 microlensing events that have been recorded since the project began.

In this case, there were two separate microlensing events, one in 2008 that revealed the main star and suggested the presence of the planet, and one in 2010 that confirmed the presence of the planet and revealed the second star.

But his black holes were smaller than 1019 kilograms, which is now ruled out by observations of microlensing events.

Based on a statistical analysis of more than 2,600 microlensing events, drawn from six years of observations on about 50 million stars, the OGLE team estimates that there is perhaps one Jupiter - mass rogue planet for every four stars in the galaxy.

Jennifer Yee, an astronomer at the Harvard — Smithsonian Center for Astrophysics and KMTNet team member, says that longer monitoring would make it easier to detect the signals of rogue Earths — and to distinguish them from confounding effects such as stellar flares, which can mimic ultrashort microlensing events.

Of the more than 2,600 microlensing events the OGLE team observed and analyzed, six were «ultrashort,» lasting less than half a day — suggesting they were caused by objects somewhere between one and 10 times the Earth's mass.

These microlensing events, ranging from a few hours to a few days in duration, will enable astronomers to measure precisely the mass of this isolated red dwarf.

«WFIRST will make measurements like we have made for OGLE -2005-BLG-169 for virtually all the planetary microlensing events it observes.

Microlensing events are random occurrences and don't depend on star selection.

The Optical Gravitational Lensing Experiment IV (OGLE - IV) has just entered operation and a new program at Wise Observatory in Tel Aviv will begin operation following up on microlensing events next year.

«It is the first time we were able to completely resolve the source star and the lensing star after a microlensing event.

The observations, taken with the Near Infrared Camera 2 (NIRC2) on the Keck 2 telescope more than eight years after the microlensing event, provided a precise measurement of the foreground and background stars» relative motion.

So, when the PLANET collaboration detected 40 microlensing events, and noted that three contained exoplanets, they could do a statistical analysis to estimate the number of stars that have exoplanets in our galaxy.

By studying the microlensing event light - curve (i.e. how the brightening fluctuates with time), we can learn many things about the object (s) creating the lens.

Also, astronomers familiar with the signal are considering the possibility of a microlensing event — a distant radio source may have been momentarily amplified by HD164595 through the warping of spacetime, creating a cosmic lens, making the radio signal look like a suspect radio burst.

As microlensing events are, by their nature, one - offs, astronomers needed another way to confirm the nature of OGLE -2007-BLG-349 and Hubble has been used to zoom in on the star system that triggered the 2007 brightening.

Despite these observational challenges, astronomers have successfully spotted many thousands of such microlensing events as part of various comprehensive deep - sky surveys during the last couple decades which have monitored hundreds of millions of stars for many years at a time, like the MACHO Collaboration project, the Microlensing Observations in Astrophysics, or MOA, and the Optical Gravitational Lensing Experiment, or OGLE.

More specifically, the researchers sought out to determine whether NASA's infrared orbiting observatory could be used to make space - based parallax measurements of microlensing events soon after they had been recorded from ground - based telescopes.

Similarly, Yee's team used Spitzer throughout the summer of 2014 for an 100 - hour pilot observing program, during which they studied a microlensing event of interest that had been previously detected by the OGLE survey in February.

Because the microlensing event depends on one star moving across the sky relative to another, microlensing measurements can only be taken at that one time when the two stars align and can not be repeated.

A microlensing event with a single lens star is a relatively simple event compared to microlensing with a two - object lens, like a binary star system or a star / planet system.

We are unable to predict when most microlensing events will occur simply because we lack good measurements of the three - dimensional motion of most stars and so we can't predict when one star will cross in front of another.

microFUN is a global network of telescopes around the world dedicated to measuring rapidly - evolving microlensing events, and together they are capable of following an event like this with nearly 24 - hours of continuous coverage.

Not exact matches

The duration and strength of such a «gravitational microlensing» event could reveal not only a rogue planet's existence but also its mass, as bigger worlds tend to create longer, stronger amplifications of a background star's light.

This primary microlensing signal is from «A», and appeared to be a regular, single star lensing event.

Another network of telescopes in Chile, South Africa, and Korea, called the Korea Microlensing Telescope Network Survey, also monitored the event.

Gravitational microlensing provides an alternative explanation, though the probability of such a high amplification event is very low.