Astronomers bring a new hope to find 'Tatooine' planets

What once was fictional as young Skywalker saw the double suns from Tatooine is astronomical reality four decades later. Normal binary suns orbit each other every eight to 100 days, and the Kepler telescope easily can detect those exoplanets (planets outside of our own solar system) as the planets transit (move across) each sun.

Trouble starts in compact binary sun systems – where sibling suns move closer together – making it difficult for the most advanced telescopes to find them. Essentially, for Kepler and other telescopes, the planetary orbital plane of these double suns and their accompanying planets might be out of whack – or misaligned – rendering them invisible to us. “The current observational strategy inevitably misses a population of Tatooine planets, but future observations may reveal their existence,” said Munoz.

NASA’s Kepler telescope is a heliocentric (it orbits the sun) spacecraft that monitors star brightness in a Milky Way region near the constellation Cygnus, the swan. Measuring photons, Kepler detects lower light values – and thus, a planetary transit. Munoz explains that suns in the close binary system likely were once standard systems that have lost energy and shrunk, bringing the suns closer together. As the sibling sun’s distance decreases, the orbits of that system’s planets become misaligned, rendering it impossible for the Kepler telescope to detect planets – which no longer cross in front of the suns. Munoz and Lai suggest scouting for exoplanet-caused disturbances for compact binary star systems, to determine a new population of circumbinary planets. Said Munoz: “Since this type of ‘compact’ binary is very common, it had been very puzzling that no planets had been detected.” This research was funded by the National Science Foundation and by NASA.

by Blaine Friedlander

Klarman Hall at sunset

Tweets from CSInst

RT : What image did Hubble take on your birthday? Carl Sagan and I got elliptical galaxy NGC 4150 :) https://t.co/5ApXe6Z1A6
23 hours 26 min ago
It would definitely be a very interesting conversation indeed
1 day 20 hours ago
2 days 14 hours ago
RT : Appearance, social norms keep students off Zoom cameras https://t.co/yAR327bE0C via https://t.co/l7j9vZ28iB
2 days 20 hours ago
In the distant future, a submarine – likely without a mechanical engine – will visit and cruise Kraken Mare, Dr. Va… https://t.co/ABuVtS2VR4
2 days 20 hours ago
"In this context, to understand the depth and composition of Kraken Mare & the Moray Sinus is important because thi… https://t.co/Qdz4Z7zXU5
2 days 20 hours ago