In April 2018, the planet-hunting satellite was launched. To date, the mission team has discovered over 2,600 planets and has identified more than 100 exoplanets that need to be confirmed. Publicly available TESS data is used by volunteer citizen scientists to search through graphs that show the brightness of stars being observed by the satellite called light curves. If any of the stars show a dip in brightness, it could mean that a planet has passed in front of the star during orbit, which is called a transit.
If multiple people submit the same light curve for researchers to analyze, an algorithm collects them. This way, they have exoplanet candidates they can follow up on. These light curves help to have human eyes because computers cannot correctly identify potential planets as other phenomena can be easily mistaken for planets.
The researchers analyzed the information collected by citizen scientists about HD 152843 and compared it with Models. They found out that two transit were made by the planet closest to the star, planet b, while a third observed transit likely came from the outer planet, planet c. Follow-up observations of the star were made using the High Accuracy Radial velocity Planet Searcher for the Northern hemisphere, at the Telescopio Nazionale Galileo in La Palma, Spain, or the Extreme Precision Spectrometer instrument at Lowell Observatory in Flagstaff, Arizona, and HARPS-N.
Using the radial velocity method provided further confirmation of the planets, which tracks the wobble of starlight as planets orbit a star. Both the planets are too gaseous and hot to support life.