paper

TOI-4010: A System of Three Large Short-Period Planets With a Massive Long-Period Companion

arXiv:2306.05308 · doi:10.3847/1538-3881/acd537

Abstract

We report the confirmation of three exoplanets transiting TOI-4010 (TIC-352682207), a metal-rich K dwarf observed by TESS in Sectors 24, 25, 52, and 58. We confirm these planets with HARPS-N radial velocity observations and measure their masses with 8 - 12% precision. TOI-4010 b is a sub-Neptune ( $P = 1.3$ days, $R_{p} = 3.0 2_{- 0.08}^{+ 0.08} R_{\oplus}$ , $M_{p} = 11.0 0_{- 1.27}^{+ 1.29} M_{\oplus}$ ) in the hot Neptune desert, and is one of the few such planets with known companions. Meanwhile, TOI-4010 c ( $P = 5.4$ days, $R_{p} = 5.9 3_{- 0.12}^{+ 0.11} R_{\oplus}$ , $M_{p} = 20.3 1_{- 2.11}^{+ 2.13} M_{\oplus}$ ) and TOI-4010 d ( $P = 14.7$ days, $R_{p} = 6.1 8_{- 0.14}^{+ 0.15} R_{\oplus}$ , $M_{p} = 38.1 5_{- 3.22}^{+ 3.27} M_{\oplus}$ ) are similarly-sized sub-Saturns on short-period orbits. Radial velocity observations also reveal a super-Jupiter-mass companion called TOI-4010 e in a long-period, eccentric orbit ( $P \sim 762$ days and $e \sim 0.26$ based on available observations). TOI-4010 is one of the few systems with multiple short-period sub-Saturns to be discovered so far.

26 pages, 16 figures, published in AJ; (v3) added missing citation