A Neptune-size Planet Candidate in a 2.77 days Orbit Around TYC 8996-1013-1?

Abstract

We report the detection of repeated transits in the TESS light curves of TYC 8996-1013-1 (TIC 414929408) with a period of 2.77542 ± 0.00001 days and a width of 4.32 hr. We did not find significant variability in the transit time through the observations taken during TESS Sectors 37, 38, 64 and 65. The color B − V and the GAIA DR3 spectrum of TYC 8996-1013-1 point to a stellar temperature of ≈5000 K and radius of ≈1 R⊙, and thus the transit model suggests a Neptune size for the candidate transiting planet (radius ≈ 25,000 km).