Tootfinder

A Near-Infrared Spectral Library of Very Young Brown Dwarfs and Planetary-Mass Objects in the Orion Nebula Cluster
Elena Manjavacas, Mario Gennaro, Sarah Betti, Laurent Pueyo, William Balmer, Massimo Robberto
https://arxiv.org/abs/2508.14035

A Near-Infrared Spectral Library of Very Young Brown Dwarfs and Planetary-Mass Objects in the Orion Nebula Cluster
Age-benchmark brown dwarfs' and planetary-mass objects' spectroscopy is key to characterize substellar evolution. In this paper we present the JHK medium resolution (R~3000) spectra of 25 7-75 M_Jup (spectral types L3.0-M6.0) brown dwarfs and planetary-mass objects in the Orion Nebula Cluster obtained with MOSFIRE installed at the W. M. Keck I telescope. We obtained the spectral types of the targets in our sample using template brown dwarf and planetary-mass objects' spectra. We confirmed their…

Are the ONC, Pleiades, and Hyades snapshots of the same embedded cluster? #StarClusters – all with the same origin? https://www.uni-bonn.de/en/news/134-2025 - the trio of star clusters Orion Nebula, Pleiades and Hyades do not just randomly lie in the same region of space.

Are the ONC, Pleiades, and Hyades snapshots of the same embedded cluster?
Ghasem Safaei, Hosein Haghi, Akram Hasani Zonoozi, Pavel Kroupa
https://arxiv.org/abs/2507.12531

Are the ONC, Pleiades, and Hyades snapshots of the same embedded cluster?
Using direct $N$-body simulations, we investigate the initial conditions and evolution of a star-forming region resembling the Orion Nebula Cluster (ONC) with the advanced \textsc{NBODY6} code. By varying the initial conditions, we aim to identify a model that closely aligns with observed parameters such as the half-mass radius, core radius, and total mass. Additionally, we examine the cluster's evolution over 800 Myr to determine whether it could reproduce the present-day properties of the Ple…

Probing accretion and stellar properties in the Orion Nebula with VLT/X-Shooter
L. Piscarreta, G. Beccari, R. A. B. Claes, C. F. Manara, H. M. J. Boffin, T. Jerabkova, B. Ercolano, A. Natta, S. E. van Terwisga
https://arxiv.org/abs/2509.08784

Probing accretion and stellar properties in the Orion Nebula with VLT/X-Shooter
Multiple photometric studies have reported the presence of seemingly older accreting pre-main sequence stars (PMS) in optical colour-magnitude diagrams (CMDs). We investigate this phenomenon in the Orion Nebula, which harbors a subset of stars that show infrared excess detected by Spitzer and Halpha excess emission, yet display significantly older isochronal ages (>10 Myr) compared to the bulk population (~1-3 Myr) in the r, (r-i) CMD. We perform a detailed spectroscopic analysis of 40 Orion Ne…

Observation of an Accreting Planetary-Mass Companion with Signs of Disk-Disk Interaction in Orion
Emilie Vila, Paul Amiot, Olivier Bern\'e, Ilane Schroetter, Thomas Haworth, Peter Zeidler, Christiaan Boersma, Jan Cami, Asuncion Fuente, Javier R. Goicoechea, Takashi Onaka, Els Peeters, Massimo Robberto, Markus R\"ollig
https://arxi…

Observation of an Accreting Planetary-Mass Companion with Signs of Disk-Disk Interaction in Orion
Young ($\lesssim 10$ Myr) planetary-mass companions (PMCs) provide valuable insights into the formation and early evolution of planetary systems. To date, only a dozen such objects have been identified through direct imaging. Using JWST/NIRCam observations towards the Orion Nebula, obtained as part of the \textit{PDRs4All} Early Release Science program, we have identified a faint point source near the M-type star V2376 Ori. Follow-up spectroscopic observations with the MUSE instrument on the VL…

JWST Spectra of Brown Dwarf Candidates in the Orion Nebula Cluster: https://arxiv.org/abs/2507.03679 / Spectroscopy of Free-Floating Planetary-Mass Objects and their disks with JWST: https://arxiv.org/abs/2507.05155

Large Scale Wind Driven Structures in the Orion Nebula
C. R. O'Dell, N. P. Abel
https://arxiv.org/abs/2507.02147 https://arxiv.or…

Large Scale Wind Driven Structures in the Orion Nebula
A study of [C II] 158 micron and HI 21-cm spectroscopic images plus high velocity resolution optical and ultraviolet spectra has shown the structure of the Orion Nebula to be different from that found from the study of those data separately. The [C II] features recently identified as the [C II] Shell is shown to be part of the Veil-B HI foreground layer. Jointly called the Outer Shell, it covers the bright Huygens Region and the Extended Orion Nebula. Its maximum expansion velocity is 15 km/s. …

The Impact of External Radiation on the Inner Disk Chemistry of Planet Formation
Jenny K. Calahan, Karin \"Oberg, Alice Booth
https://arxiv.org/abs/2508.06613 https://

The Impact of External Radiation on the Inner Disk Chemistry of Planet Formation
The vast majority of young stars hosting planet-forming disks exist within clustered environments, like the Orion Nebula, implying that seemingly `extreme' UV environments (10^4 G_0 and above) are not so atypical in the context of planet formation. Using thermo-chemical modeling, we explore how the temperature and chemistry within a protoplanetary disk around a T Tauri star is impacted by the surrounding UV environment. The disk becomes hotter due to heating by photodissociation of molecules, p…

Line ratio identification of external photoevaporation
Tyger Peake, Thomas J. Haworth, Mari-Liis Aru, William J. Henney
https://arxiv.org/abs/2506.19788 ht…

Line ratio identification of external photoevaporation
External photoevaporation of protoplanetary discs, by massive O stars in stellar clusters, is thought to be a significant process in the evolution of a disc. It has been shown to result in significant mass loss and disc truncation, ultimately reducing the lifetime of the discs, and possibly affecting potential planet populations. It is a well-studied process in the Orion Nebula Cluster (ONC) where the cometary morphology of proplyds is spatially resolvable due to its proximity to Earth. However…