TOI-1338 : TESS' first transiting circumbinary planet

The very first of a long list ! (ExSS4 meeting)

https://www.nasa.gov/feature/goddard/2020/nasa-s-tess-mission-uncovers-its-1st-world-with-two-stars

TOI 1338 b, as it is now called, is TESS’s first circumbinary planet, a world orbiting two stars. The discovery was featured in a panel discussion on Monday, Jan. 6, at the 235th American Astronomical Society meeting in Honolulu. A paper, which Cukier co-authored along with scientists from Goddard, San Diego State University, the University of Chicago and other institutions, has been submitted to a scientific journal.

The TOI 1338 system lies 1,300 light-years away in the constellation Pictor. The two stars orbit each other every 15 days. One is about 10% more massive than our Sun, while the other is cooler, dimmer and only one-third the Sun’s mass.

TOI 1338 b is the only known planet in the system. It’s around 6.9 times larger than Earth, or between the sizes of Neptune and Saturn. The planet orbits in almost exactly the same plane as the stars, so it experiences regular stellar eclipses.

(...)

TOI 1338 had already been studied from the ground by radial velocity surveys, which measure motion along our line of sight. Kostov’s team used this archival data to analyze the system and confirm the planet. Its orbit is stable for at least the next 10 million years. The orbit’s angle to us, however, changes enough that the planet transit will cease after November 2023 and resume eight years later.

The paper !!

https://arxiv.org/abs/2004.07783

TOI-1338 : TESS' First Transiting Circumbinary Planet

page 9 :

"...The HARPS measurements indicate that this system has very little activity, making it optimal for radial-velocity measurements. The BEBOP survey is ongoing and more spectra from both HARPS and ESPRESSO will be obtained for TOI-1338/EBLM J0608-59, and published in a subsequent paper..."

page 22 :

"...The primary TESS mission ends in 2020 July, but fortunately the mission has been extended through at least the
year 202211. Depending on the exact pointing schedule, there is a good chance that TESS can observe transits again
on 2020 October 19, 2021 January 23, 2021 April 26, and possibly July 30..."