ALMA | ESO | NRAO | NAOJ | 2018 Jun 13
Novel technique to find youngest planets in our galaxy
Two independent teams of astronomers have used ALMA to uncover convincing evidence that three young planets are in orbit around the infant star HD 163296. Using a novel planet-finding technique, the astronomers identified three disturbances in the gas-filled disc around the young star: the strongest evidence yet that newly formed planets are in orbit there. These are considered the first planets to be discovered with ALMA.Credit: ESO, ALMA (ESO/NAOJ/NRAO); Pinte et al.
The Atacama Large Millimeter/submillimeter Array (ALMA) has transformed our understanding of protoplanetary discs — the gas- and dust-filled planet factories that encircle young stars. The rings and gaps in these discs provide intriguing circumstantial evidence for the presence of protoplanets . Other phenomena, however, could also account for these tantalising features.
But now, using a novel planet-hunting technique that identifies unusual patterns in the flow of gas within a planet-forming disc around a young star, two teams of astronomers have each confirmed distinct, telltale hallmarks of newly formed planets orbiting an infant star . ...
To make their respective discoveries, each team analysed ALMA observations of HD 163296, a young star about 330 light-years from Earth in the constellation of Sagittarius (The Archer) . This star is about twice the mass of the Sun but is just four million years old — just a thousandth of the age of the Sun. ...
New and Improved Way to Find Baby Planets
Carnegie Institution for Science | 2018 Jun 13
Kinematic Evidence for an Embedded Protoplanet in a Circumstellar Disc - C. Pinte et al
- Astrophysical Journal Letters 860(1):L13 (2018 Jun 10) DOI: 10.3847/2041-8213/aac6dc
- arXiv.org > astro-ph > arXiv:1805.10293 > 25 May 2018
- Astrophysical Journal Letters 860(1):L12 (2018 Jun 10) DOI: 10.3847/2041-8213/aac6d7
- arXiv.org > astro-ph > arXiv:1805.10290 > 25 May 2018 (v1), 30 May 2018 (v2)