학술논문
TOI-532b: The Habitable-zone Planet Finder confirms a Large Super Neptune in the Neptune Desert orbiting a metal-rich M dwarf host
Document Type
Working Paper
Author
Kanodia, Shubham; Stefansson, Gudmundur; Canas, Caleb I.; Maney, Marissa; Lin, Andrea S.; Ninan, Joe P.; Jones, Sinclaire; Monson, Andrew J.; Parker, Brock A.; Kobulnicky, Henry A.; Rothenberg, Jason; Beard, Corey; Lubin, Jack; Robertson, Paul; Gupta, Arvind F.; Mahadevan, Suvrath; Cochran, William D.; Bender, Chad F.; Diddams, Scott A.; Fredrick, Connor; Halverson, Samuel P.; Hawley, Suzanne L.; Hearty, Fred R.; Hebb, Leslie; Kopparapu, Ravi K.; Metcalf, Andrew J.; Ramsey, Lawrence W.; Roy, Arpita; Schwab, Christian; Schutte, Maria; Terrien, Ryan C.; Wisniewski, John P.; Wright, Jason T.
Source
Astronomical Journal, 162, 135, 2021
Subject
Language
Abstract
We confirm the planetary nature of TOI-532b, using a combination of precise near-infrared radial velocities with the Habitable-zone Planet Finder, TESS light curves, ground based photometric follow-up, and high-contrast imaging. TOI-532 is a faint (J$\sim 11.5$) metal-rich M dwarf with Teff = $3957\pm69$ K and [Fe/H] = $0.38\pm0.04$; it hosts a transiting gaseous planet with a period of $\sim 2.3$ days. Joint fitting of the radial velocities with the TESS and ground-based transits reveal a planet with radius of $5.82\pm0.19$ R$_{\oplus}$, and a mass of $61.5_{-9.3}^{+9.7}$ M$_{\oplus}$. TOI-532b is the largest and most massive super Neptune detected around an M dwarf with both mass and radius measurements, and it bridges the gap between the Neptune-sized planets and the heavier Jovian planets known to orbit M dwarfs. It also follows the previously noted trend between gas giants and host star metallicity for M dwarf planets. In addition, it is situated at the edge of the Neptune desert in the Radius--Insolation plane, helping place constraints on the mechanisms responsible for sculpting this region of planetary parameter space.
Comment: 19 pages, 9 figures, 4 tables. arXiv admin note: text overlap with arXiv:2006.14546
Comment: 19 pages, 9 figures, 4 tables. arXiv admin note: text overlap with arXiv:2006.14546