The white dwarf is the dead core of a star that burned out a billion years ago.
An illustration showing how Hubble sees light warped by the gravitational force of an intermediate object.To make their measurement of LAWD 37, the team had to wait for the dwarf to pass in front of the background star, an event that was predictable thanks to data from the ESA’smission. Then, the researchers carefully parsed the light from the background star from the overwhelming glare of the much-nearer LAWD 37.
“The size of our measured offset is like measuring the length of a car on the Moon as seen from Earth,” said Peter McGill, an astronomer at UC Santa Cruz and the paper’s lead author, in the ESA release. “The glare from the white dwarf can cause streaks in unpredictable directions, meaning we had to analyze each of Hubble’s observations extremely carefully, and their limitations, to model the event and estimate the mass of LAWD 37.”With this information, astronomers will be able to test the relationship between mass and radius for other white dwarfs, in turn revealing more information about how matter works under.
In fact, Webb already has. Some Webb observations of LAWD 66 were taken in 2022, and more are planned for 2024.
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