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New Images Show Signs of Planets Forming around Young Star

Au MIC star



MICHAEL LIU, IFA-HAWAII/W. M. KECK OBSERVATORY
Astronomers have gotten the best view yet of a potential planet-forming disk around a young star. AU Microscopii (AU Mic) is located 33 light-years away from Earth and is surrounded by a dusty disk first discovered earlier this year. The new images, published in the latest issue of Science Express, are 30 times sharper than previous ones and provide hints of unseen planets.

¿We cannot yet directly image young planets around AU Mic, but they cannot completely hide from us either,¿ says study author Michael Liu of the University of Hawaii's Institute for Astronomy. ¿They reveal themselves through their gravitational influence, forming patterns in the sea of dust grains orbiting the star.¿ Liu used the Keck II Telescope to study the 12-million-year-old red star. Instead of appearing symmetric, the disk encircling AU Mic is uneven, with clumps that arise through interactions with the gravity of accompanying planets. The clusters are far from AU Mic, lying between 25 and 40 astronomical units away, about the same distance as Neptune and Pluto are from our sun.

The new data do not reveal what types of planets could be present, but suggest that they travel in elliptical orbits. ¿By studying very young stars like AU Mic, we gain insight into the planet formation process as it is occurring,¿ Liu says. ¿As a result, we learn about the birth of our own solar system and its planets.¿

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