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Matese and Daniel Whitmire say that the points of origin for long-period comets gives a pattern that suggests Tyche's existence. They noted that Tyche, if it exists, should be seen in the archive of data that was collected by NASA's Wide-field Infrared Survey Explorer (WISE) telescope. However, several astronomers disagree that Tyche exists. In 2014 NASA announced that WISE had not found such a planet. 
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- Wolchover, Natalie (2011). "Article: Astronomers doubt giant planet 'Tyche' exists in our Solar System". Space.com. http://www.space.com/10863-mystery-planet-tyche-debate.html. Retrieved February 15, 2011.
- Matese, John J.; Whitmire, Daniel P. (2011). "Persistent evidence of a jovian mass solar companion in the Oort cloud" (PDF). Icarus 211 (2): 926–938. . http://arxiv.org/PS_cache/arxiv/pdf/1004/1004.4584v1.pdf.
- Plait, Phil (2011). "No, there’s no proof of a giant planet in the outer Solar System". Discovery Magazine. http://blogs.discovermagazine.com/badastronomy/2011/02/14/no-theres-no-proof-of-a-giant-planet-in-the-outer-solar-system/#more-28256. Retrieved February 15, 2011.
- Helhoski, Anna. "News 02/16/11 Does the Solar System have giant new planet?". The Norwalk Daily Voice. http://norwalk.dailyvoice.com/news/does-solar-system-have-giant-new-planet. Retrieved 10 July 2012.