Category Astronomy/Space

For the first time, astronomers have observed a star pulsing in response to its orbiting planet. The star, HAT-P-2, pictured, is one of the most massive exoplanets known today. The planet, named HAT-P-2b, tracks its star in a highly eccentric orbit, flying extremely close to and around the star, then hurtling far out before eventually circling back around. Credit: Image courtesy of NASA (edited by MIT News)

Scientists observe first planet-induced stellar pulsations. For the first time, astronomers from MIT and elsewhere have observed a star pulsing in response to its orbiting planet.The star, which goes by the name HAT-P-2, is about 400 light years from Earth and is circled by a gas giant measuring 8X the mass of Jupiter – one of the most massive exoplanets known today...

This is an artist’s conceptions of the probable planet orbiting a star called GJ 411. Credit: Courtesy of Ricardo Ramirez

An international team of astronomers released the largest-ever compilation of exoplanet-detecting observations made using a radial velocity method. They demonstrated how these observations can be used to hunt for planets by detecting more than 100 potential exoplanets, including one orbiting the 4th -closest star to our own Solar System, ~8.1 light years away from Earth. The radial velocity method is one of the most successful techniques for finding and confirming planets. It takes advantage of the fact that in addition to a planet being influenced by the gravity of the star it orbits, the planet’s gravity also affects the star...

The Kepler spacecraft has been prolific in its search for exoplanets, discovering thousands since its launch in 2009. But the hunt for moons orbiting these exoplanets, or exomoons, is vastly more challenging. While no exomoons have been found to date, a new study shows that the search is not futile. Researchers have demonstrated for the first time that it is possible for a planetary collision to form a moon large enough for Kepler to detect. Lawrence Livermore National Laboratory physicist Megan Bruk Syal and Amy Barr of the Planetary Science Institute conducted 30 simulations to explore how various factors affect moon creation...

Background SDSS image (composite from bands g, r and i) overlaid with white MSSS contours of the GRG at 2, 3, 4, 6 and 8 times the RMS noise (34 mJy/beam). NVSS contours are overlaid in red at 3, 5, 10 and 20 times the RMS noise (0.55 mJy/beam) revealing a bright part of the radio jet towards the north-east. The beam sizes are shown in the lower left. Credit: Clarke et al., 2017.

An international team of astronomers reports the discovery of a new giant radio galaxy (GRG) associated with the galaxy triplet known as UGC 9555. The newly discovered galaxy turns out to be one of the largest GRGs so far detected. Located 820 million light years away from the Earth, UGC 9555 is a part of a larger group of galaxies designated MSPM 02158...