TOI-2498 b: A hot bloated super-neptune within the neptune desert

Autor: Ginger Frame, David J Armstrong, Heather M Cegla, Jorge Fernández Fernández, Ares Osborn, Vardan Adibekyan, Karen A Collins, Elisa Delgado Mena, Steven Giacalone, John F Kielkopf, Nuno C Santos, Sérgio G Sousa, Keivan G Stassun, Carl Ziegler, David R Anderson, Susana C C Barros, Daniel Bayliss, César Briceño, Dennis M. Conti, Courtney D Dressing, Xavier Dumusque, Pedro Figueira, William Fong, Samuel Gill, Faith Hawthorn, Jon M Jenkins, Eric L N Jensen, Marcelo Aron F Keniger, David W Latham, Nicholas Law, Jack J Lissauer, Andrew W Mann, Louise D Nielsen, Hugh Osborn, Martin Paegert, Sara Seager, Richard P Schwarz, Avi Shporer, Gregor Srdoc, Paul A Strøm, Joshua N Winn, Peter J Wheatley
Rok vydání: 2023
Předmět:
Zdroj: Monthly Notices of the Royal Astronomical Society.
ISSN: 1365-2966
0035-8711
DOI: 10.1093/mnras/stad1452
Popis: 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
Databáze: OpenAIRE
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