학술논문
TOI-2498 b: A hot bloated super-Neptune within the Neptune desert
Document Type
Working Paper
Author
Frame, Ginger; Armstrong, David J.; Cegla, Heather M.; Fernández, Jorge Fernández; Osborn, Ares; Adibekyan, Vardan; Collins, Karen A.; Mena, Elisa Delgado; Giacalone, Steven; Kielkopf, John F.; Santos, Nuno C.; Sousa, Sérgio G.; Stassun, Keivan G.; Ziegler, Carl; Anderson, David R.; Barros, Susana C. C.; Bayliss, Daniel; Briceño, César; Conti, Dennis M.; Dressing, Courtney D.; Dumusque, Xavier; Pedro~Figueira; Fong, William; Gill, Samuel; Hawthorn, Faith; Jenkins, Jon M.; Jensen, Eric L. N.; Keniger, Marcelo Aron F.; Latham, David W.; Law, Nicholas; Lissauer, Jack J.; Mann, Andrew W.; Nielsen, Louise D.; Osborn, Hugh; Paegert, Martin; Seager, Sara; Schwarz, Richard P.; Shporer, Avi; Srdoc, Gregor; Strøm, Paul A.; Winn, Joshua N.; Wheatley, Peter J.
Source
Subject
Language
Abstract
We present the discovery and confirmation of a transiting hot, bloated Super-Neptune using photometry from TESS and LCOGT and radial velocity measurements from HARPS. The host star TOI-2498 is a V = 11.2, G-type (T$_{eff}$ = 5905 $\pm$ 12K) solar-like star with a mass of 1.12 $\pm$ 0.02 M$_{\odot}$ and a radius of 1.26 $\pm$ 0.04 R$_{\odot}$. The planet, TOI-2498 b, orbits the star with a period of 3.7 days, has a radius of 6.1 $\pm$ 0.3 R$_{\oplus}$, and a mass of 35 $\pm$ 4 M$_{\oplus}$. This results in a density of 0.86 $\pm$ 0.25 g cm$^{-3}$. TOI-2498 b resides on the edge of the Neptune desert; a region of mass-period parameter space in which there appears to be a dearth of planets. Therefore TOI-2498 b is an interesting case to study to further understand the origins and boundaries of the Neptune desert. Through modelling the evaporation history, we determine that over its $\sim$3.6 Gyr lifespan, TOI-2498 b has likely reduced from a Saturn sized planet to its current radius through photoevaporation. Moreover, TOI-2498 b is a potential candidate for future atmospheric studies searching for species like water or sodium in the optical using high-resolution, and for carbon based molecules in the infra-red using JWST.
Comment: 13 pages, 11 figures, accepted for publication in MNRAS
Comment: 13 pages, 11 figures, accepted for publication in MNRAS