What Did NASA’s Exoplanet Announcement on 06/19/17 Reveal?

TL;DR

NASA’s exoplanet announcement reported 219 additional candidates found in Kepler data, including 10 roughly Earth-sized candidates orbiting within their stars’ habitable zones. Kepler produced a catalog of 4,034 candidates, more than half of which had been verified, while also revealing two broad groups of small planets. Read on to understand the findings, Kepler’s detection limits, and why further verification matters.

Transcript

Today, NASA held a press conference that has some interesting implications on exoplanet study and the number of earth-like exoplanets that might exist in the galaxy. More, they announced the discovery of 219 further candidates for exoplanets, all discovered in the Kepler data, and most interestingly ten of these are around the size of earth and orb... Read More

Key Insights

• 🌥️ NASA's Kepler mission has been highly successful, cataloging a large number of exoplanet candidates for further study.
• 🤩 In addition to exoplanet discoveries, Kepler has provided valuable data on stars and multiple star systems, benefiting stellar astronomers.
• 🤑 The discovery of different types of small planets, including rocky ones and mini-Neptunes, offers insights into planetary formation processes.
• 🤩 Kepler's limitations in only observing planets that pass in front of their stars means there could be many more exoplanets within its field of view.

Questions & Answers

Q: What did NASA announce about exoplanets on 06/19/17?

NASA announced 219 additional exoplanet candidates discovered in Kepler data. Ten were around Earth’s size and orbited within the habitable zones of their stars.

Q: How many exoplanet candidates did Kepler identify?

Kepler’s catalog contained 4,034 exoplanet candidates. At the time discussed, more than half had been verified.

Q: Were the 219 newly announced objects confirmed exoplanets?

They were presented as candidates rather than confirmed exoplanets. The catalog was intended to help scientists verify whether the objects were planets and then study them further.

Q: How did Kepler detect potential exoplanets?

Kepler repeatedly photographed a small region of the sky in the constellation Cygnus. It detected dips in the light curves of thousands of stars when planets passed in front of them from the spacecraft’s perspective.

Q: How many Earth-sized planets in habitable zones had been verified?

The transcript says Kepler’s findings included 50 Earth-sized planets within habitable zones. According to NASA’s press release, 30 of those had been verified.

Q: What two groups of small planets did researchers identify?

Researchers found that small planets generally fell into two groups: rocky worlds like Earth or Mars and mini-Neptune-like planets. The latter developed swollen hydrogen and helium atmospheres, while about half remained rocky.

Q: Why might Kepler have missed many exoplanets?

Kepler could detect a planet only when it passed in front of its star along the spacecraft’s line of sight. The transcript says as many as 100 times more exoplanets could exist within Kepler’s field than it could actually see.

Q: What else did the Kepler mission discover or support?

Kepler collected useful data about stars, variable stars, and multiple-star systems, including a complicated five-star system. It also discovered KIC 8462852 and supported public participation through the Planet Hunters program, where volunteers helped identify candidates and unusual objects.

Summary & Key Takeaways

• NASA revealed 219 new exoplanet candidates, 10 of which are Earth-sized and located within the habitable zone of their stars.

• The discovery is part of NASA's mission cataloging project using Kepler data to study and verify exoplanet candidates.

• Kepler's primary mission was to photograph a small section of the sky and led to the discovery of 4,034 exoplanet candidates, including 50 Earth-sized planets.