Microlensing Constraints on the Mass of Single Stars from HST Astrometric Measurements
Astrophysical Journal, ISSN: 1538-4357, Vol: 843, Issue: 2
2017
- 30Citations
- 7Captures
Metric Options: Counts1 Year3 YearSelecting the 1-year or 3-year option will change the metrics count to percentiles, illustrating how an article or review compares to other articles or reviews within the selected time period in the same journal. Selecting the 1-year option compares the metrics against other articles/reviews that were also published in the same calendar year. Selecting the 3-year option compares the metrics against other articles/reviews that were also published in the same calendar year plus the two years prior.
Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
Citation Benchmarking is provided by Scopus and SciVal and is different from the metrics context provided by PlumX Metrics.
Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
Citation Benchmarking is provided by Scopus and SciVal and is different from the metrics context provided by PlumX Metrics.
Article Description
We report on the first results from a large-scale observing campaign aiming to use astrometric microlensing to detect and place limits on the mass of single objects, including stellar remnants. We used the Hubble Space Telescope to monitor stars near the Galactic Center for three years, and we measured the brightness and positions of ∼2 million stars at each observing epoch. In addition to this, we monitored the same pointings using the VIMOS imager on the Very Large Telescope. The stars we monitored include several bright microlensing events observed from the ground by the OGLE collaboration. In this paper, we present the analysis of our photometric and astrometric measurements for six of these events, and derive mass constraints for the lens in each of them. Although these constraints are limited by the photometric precision of ground-based data, and our ability to determine the lens distance, we were able to constrain the size of the Einstein ring radius thanks to our precise astrometric measurements - the first routine measurements of this type from a large-scale observing program. This demonstrates the power of astrometric microlensing as a tool to constrain the masses of stars, stellar remnants, and, in the future, extrasolar planets, using precise ground- and space-based observations.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85025094397&origin=inward; http://dx.doi.org/10.3847/1538-4357/aa78eb; https://iopscience.iop.org/article/10.3847/1538-4357/aa78eb; https://dx.doi.org/10.3847/1538-4357/aa78eb; https://validate.perfdrive.com/9730847aceed30627ebd520e46ee70b2/?ssa=bfa3555c-c305-4a90-91e0-103b91c42252&ssb=15673232697&ssc=https%3A%2F%2Fiopscience.iop.org%2Farticle%2F10.3847%2F1538-4357%2Faa78eb&ssi=e3a48a35-cnvj-4f18-93ee-0756643f84f6&ssk=botmanager_support@radware.com&ssm=45108621560719785436600002839149194&ssn=8ceceb3a1e0799e3744e966b15bb51e65870765553ad-d587-4971-874a37&sso=81f81a66-0a667121c17a60e56a3d3dc09adb2b4936135cfc5286cfae&ssp=10872095461734387847173460090241692&ssq=99544739454619503431070207995418812038124&ssr=NTIuMy4yMTcuMjU0&sst=com.plumanalytics&ssu=&ssv=&ssw=&ssx=eyJyZCI6ImlvcC5vcmciLCJfX3V6bWYiOiI3ZjYwMDBhYWEwODA3OS0yYjZmLTQzMWUtYWIwYi1iMzU3NDJlZTczNmYxNzM0MzcwMjA3OTY2MzI0MzM4NjIxLTk5NGUxZDEzNWIxZTEzNmE0MzY1NyIsInV6bXgiOiI3ZjkwMDA1OWJhYzM2Zi1jMjQyLTQyZTAtYjhjYi01MzM4ZDRhYmI4YjI1LTE3MzQzNzAyMDc5NjYzMjQzMzg2MjEtNTdjYTQxZDAwMWFhNzRjYTQzNjUxIn0=
American Astronomical Society
Provide Feedback
Have ideas for a new metric? Would you like to see something else here?Let us know