#circumbinary — Public Fediverse posts

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Detection of 27 candidate #circumbinary planets through apsidal precession of eclipsing binaries observed by TESS: https://academic.oup.com/mnras/article/548/3/stag515/8524019?login=false -> New Star Wars-like planet candidates with two suns discovered / For NASA’s TESS, Stellar Eclipses Shed Light on Possible New Worlds: https://news.unsw.edu.au/en/almost-30-real-life-tatooine-planet-candidates-discovered / https://science.nasa.gov/missions/tess/for-nasas-tess-stellar-eclipses-shed-light-on-possible-new-worlds/

The formation of #circumbinary planets through disc fragmentation: https://academic.oup.com/mnras/article/548/3/stag476/8661676?login=false -> Two suns are better than one - planets thrive around binary stars: https://www.lancashire.ac.uk/news/two-suns-are-better-than-one

I started this thread because I thought a new #circumbinary system had been discovered this week in a paper entitled "A planetary system around a binary star, including a mini-Neptune in the habitable zone". However, despite the system apparently being "around a binary star", this is actually just a traditionally-orbiting planet around a star which also happens to have a stellar companion. Booo. https://arxiv.org/abs/2404.18997

NB - There is an outdated nomenclature which I think should be left to die: "S" and "P"-type orbits. "#Circumbinary" is a perfectly good term which is far more descriptive and intuitive than "P-type". While S-type in in many ways inseparable from just a normal planet-star orbit? It's like giving a unique term to any roundabouts that have a second smaller roundabout within a few kilometers.

The weird/interesting type of planets in binary systems are #circumbinary planets. Here, a binary pair of stars orbit close together (few days to weeks period), and planets orbit the pair of them (typically with periods of a few months or longer). Close binaries are much rarer, and finding planets around them is difficult, so only a few are known. Understanding where circumbinary planets are stable, and how they could have formed is a tricky problem. Examples: PH-2, Kepler-16, Tatooine, etc.

Radial-velocity discovery of a second #planet in the TOI-1338/BEBOP-1 #circumbinary system: https://www.nature.com/articles/s41550-023-01948-4 -> A new #Tatooine-like multi-planetary system identified: https://www.birmingham.ac.uk/news/2023/a-new-tatooine-like-multi-planetary-system-identified - an international team of astronomers has announced the second-ever discovery of a multiplanetary circumbinary system.

We report the detection of a gas-giant #planet in orbit around both stars of an eclipsing #binarystar system that also contains a smaller, inner transiting planet . The new planet was discovered using radial-velocity data , it is a 65.2 M⊕ #circumbinary planet with a period of 215.5 days. This is the first detection of a circumbinary planet using radial-velocity observations alone, and makes it only the second confirmed multiplanet circumbinary system to date: https://arxiv.org/abs/2301.10794