A lost planet rediscovered

The planet, the size, and mass of Saturn with an orbit of thirty-five days is among hundreds of ‘lost’ worlds.


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The University of Warwick-led team has rediscovered a lost planet called NGTS-11b, which has a mass of Saturn with an orbit of thirty-five days.

The planet was found using a new method used to track down and characterize in the hope of finding cooler planets like those in our solar system and even potentially habitable planets. This discovery of a lost planet could pave the way for the detection of a world within the habitable ‘Goldilocks zone’ in a distant solar system.

The planet was originally found in a search for planets in 2018 using NASA‘s TESS telescope. This uses the transit method to spot planets, scanning for the telltale dip in light from the star that indicates that an object has passed between the telescope and the star. However, TESS only scans most sections of the sky for 27 days. This means many of the more extended-period planets only transit once in the TESS data.

And without a second observation, the planet is effectively lost. The University of Warwick led the team to follow up on one of these ‘lost’ planets using the telescopes at the Next-Generation Transit Survey (NGTS) in Chile and observed the star for seventy-nine nights, eventually catching the world transiting for a second time, nearly a year after the first detected transit.

Dr. Samuel Gill from the Department of Physics at the University of Warwick said: “By chasing that second transit down we’ve found a longer period planet. It’s the first of hopefully many such finds pushing to longer periods.”

“These discoveries are rare but important since they allow us to find longer period planets than other astronomers are finding. Longer period planets are cooler, more like the planets in our Solar System.”

“NGTS-11b has a temperature of only 160°C – cooler than Mercury and Venus. Although this is still too hot to support life as we know it, it is closer to the Goldilocks zone than many previously discovered planets, which typically have temperatures above 1000°C.”

Co-author Dr. Daniel Bayliss from the University of Warwick said: “This planet is out at a thirty-five days orbit, which is a much longer period than we usually find them. It is exciting to see the Goldilocks zone within our sights.”

Co-author Professor Pete Wheatley from the University of Warwick said: “The original transit appeared just once in the TESS data, and it was our team’s painstaking detective work that allowed us to find it again a year later with NGTS.”

“NGTS has twelve state-of-the-art telescopes, which means that we can monitor multiple stars for months on end, searching for lost planets. The dip in light from the transit is only 1% deep and occurs only once every 35 days, putting it out of reach of other telescopes.”

Dr. Gill adds: “There are hundreds of single transits detected by TESS that we will be monitoring using this method. This will allow us to discover cooler exoplanets of all sizes, including planets more like those in our own Solar System. Some of these will be small rocky planets in the Goldilocks zone that are cool enough to host liquid water oceans and potentially extraterrestrial life.”

Journal Reference:

  1. Samuel Gill et al. NGTS-11 b (TOI-1847 b): A Transiting Warm Saturn Recovered from a TESS Single-transit Event. The Astrophysical Journal Letters, 2020; DOI: 10.3847/2041-8213/ab9eb9


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