An Ultra-Short Period Super-Earth and a Sub-Neptune Orbiting the K dwarf TOI-4311

Clicks: 24
ID: 314216
2026
Free PDF
Article Quality & Performance Metrics
Overall Quality
Not rated
Combines reader engagement with the AI quality analysis. This article has not been analysed, so there is no overall score — reader engagement is measured and shown alongside.
AI Quality Assessment
Not analyzed
Readership in this journal
Popular

Ranked #344 of 1,373 articles by views in monthly notices of the royal astronomical society

Most read Least read

Bar heights use a square-root scale. Only the 120 most-read articles are drawn; the journal has 1,373 in total.

Mint this article as an NFT
Not yet minted

Create a permanent, verifiable on-chain record of this article on the Scimatic Network. The NFT is held in your Journament account, and you can withdraw it to your own wallet at any time.

5 SUSD one-off · no wallet required
Sign in to mint
Abstract
Abstract We report the discovery and characterisation of the multi-planetary system around TOI-4311, a K dwarf kinematically between the Galactic thick disk and Hercules stream. TOI-4311 hosts an ultra-short-period super-Earth (P~0.99 d, $1.376\substack{+0.077 -0.080}$ R⊕) and a longer period sub-Neptune (P~15 d, $2.47\substack{+0.12 -0.11}$ R⊕) that was first detected in the TESS photometry. Using follow-up observations with CHEOPS and HARPS, we refine the planetary radius of both planets, derive the mass of planet b ($4.5\substack{+1.5 -1.4}$ M⊕) and confirm the planetary nature of planet c. Intriguingly, a third periodic signal is clearly detected in our HARPS RVs that we cannot link to stellar activity. This signal could be attributed to a third planet (P~38 d, Msin(i)=$26.4\substack{+6.3 -6.8}$ M⊕) in the system, however with the current photometric dataset we do not find a transit. Our dynamical analysis highlights that this potential outer planet would remain stable. Using the precise radius and mass for TOI-4311 b we model its interior structure and find that it is very dense given the host star’s galactic kinematics and chemistry. Hence this system could challenge current formation theories and provide insights into planet formation across the galaxy.
Reference Key
openalex_W7161792842 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Yoshi Nike Emilia Eschen, T G Wilson, A Cameron, Alexander J. Mustill, J A Egger, Soléne Ulmer-Moll, D Gandolfi, Alexis M S Smith, O. D. S. Demangeon, S A Sousa, A. Bonfanti, Alexandre C M Correia, Vardan Adibekyan, G. Lacedelli, Alexis Brandeker, C. Pezzotti, B. Akinsanmi, Y Alibert, Roi Alonso, T. Bárczy, David Barrado, Susana C C Barros, W Baumjohann, W Benz, Nicolas Billot, Luca Borsato, Christopher Broeg, A. Castro-González, Szilard Csizmadia, Patricio E Cubillos, Melvyn B Davies, M Deleuil, A. Deline, Brice-Olivier Demory, Aliz Derekas, Giuseppe Di Persio, Billy Edwards, D Ehrenreich, Anders Erikson, A. Fortier, L Fossati, M Fridlund, Kosmas Gazeas, Michaël Gillon, Manuel Güdel, Maximilian N Günther, A. Heitzmann, Ch Helling, Kate G Isaak, Jon M Jenkins, T. Keller, Laszlo L Kiss, Daniel Kitzmann, Judith Korth, Kristine W F Lam, Jacques Laskar, Alain Lecavelier des Etangs, Adrien Leleu, Monika Lendl, Demetrio Magrin, P. F. L. Maxted, B. Merín, C Mordasini, V. Nascimbeni, Göran Olofsson, H. P. Osborn, R. Ottensamer, Isabella Pagano, Enric Pallé, Gisbert Peter, Glen Petitpas, D. Piazza, G. Piotto, D Pollacco, D. Queloz, Roberto Ragazzoni, Nicola Rando, Heike Rauer, Ignasi Ribas, Nuno C Santos, G. Scandariato, D Ségransan, Avi Shporer, A. M. Silva, Attila E Simon, Richard Southworth, M Stalport, S. Sulis, Gyula M Szabó, Stéphane Udry, B. Ulmer, Valerie Van Grootel, Julia Venturini, Eva Villaver, Nicholas A Walton, Sebastian Wolf, Carl Ziegler, T. Zingales
Are you one of these authors? Claim your profile
Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag952
URL
https://doi.org/10.1093/mnras/stag952
Keywords Keywords not found

Citations

No citations found. To add a citation, contact the admin at info@scimatic.org

Comments

No comments yet. Be the first to comment on this article.