An international team of astronomers used ALMA to capture high-resolution images of eight protoplanetary disks in the Sigma Orionis cluster, which is irradiated by intense ultraviolet light from a massive nearby star. To their surprise, they found evidence of gaps and rings in most of the disks—structures commonly associated with the formation of giant planets, like Jupiter.
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Observatory Receives Funds to Repair St. Croix Radio Telescope
Damage caused by Hurricane Maria in 2017
The National Science Foundation (NSF) has provided $2 million to repair damage to the Very Long Baseline Array
(VLBA) station on St. Croix in the U.S. Virgin Islands caused by Hurricane Maria in September of 2017. The funding is part of a bill passed by Congress and signed by the President on Feb. 9. The appropriations bill included disaster relief for hurricanes and wildfires during 2017.
The VLBA is a continent-wide radio telescope system providing the highest resolution, or ability to see fine detail, of any astronomical facility. It consists of ten stations, each with a dish antenna 25 meters in diameter, stretching from Hawaii to St. Croix. Eight of the stations are on the U.S. mainland.
The great distance between the VLBA’s antennas, up to 5,000 miles, is what makes possible the system’s great resolving power. Radio waves from cosmic objects are collected individually by each of the antennas, then combined electronically to make the system work as a single, giant radio telescope.
“The St. Croix telescope is a robust and reliable component of the Very Long Baseline Array,” said Richard Green, director of NSF’s Division of Astronomical Sciences. “The repairs afforded by the hurricane relief funds will ensure that the facility continues to serve as the key easternmost element of this continent-sized array.”
Hurricane Maria formed in the western Atlantic ocean, then entered the Caribbean Sea, devastating the island of Dominica before striking Puerto Rico and skirting the U.S. East Coast, in addition to its destruction on St. Croix. The storm is blamed for at least 146 deaths and more than $90 billion in damage.
Maria struck St. Croix as a Category 5 storm, with recorded wind gusts up to 137 mph. Officials estimated that 90 percent of the buildings on St. Croix were damaged or destroyed. The St. Croix VLBA station sustained damage to both its 240-ton antenna and the building housing its electronic equipment.
“This funding will allow us to bring the important St. Croix station back to a state of full health so it can continue to support the forefront scientific work of the VLBA,” said Walter Brisken, Director of the Long Baseline Observatory.
Dedicated in 1993, the VLBA has made major contributions to many areas of astronomical research, ranging from studying galaxies as they were when the Universe was a fraction of its current age to observing asteroids in our Solar System. The VLBA’s sharp radio “vision” has allowed it to precisely measure distances in our Milky Way and refine our home Galaxy’s map, and to make the most accurate distance measurements ever for objects beyond the Milky Way.
The VLBA also can be used to precisely determine the locations of its stations, allowing geophysicists to measure the effects of continental drift and climate change.
The Long Baseline Observatory is a facility of the National Science Foundation, operated under cooperative agreement by Associated Universities, Inc.
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