Tootfinder

Chemical transformation of CO in evolving protoplanetary discs across stellar masses: a route to C-rich inner regions
Andrew D. Sellek, Ewine F. van Dishoeck
https://arxiv.org/abs/2507.11631

Chemical transformation of CO in evolving protoplanetary discs across stellar masses: a route to C-rich inner regions
Protoplanetary discs around Very Low Mass Stars (VLMS) show hydrocarbon-rich MIR spectra indicative of C/O>1 in their inner discs, in contrast to discs around higher-mass hosts which mostly show O-bearing species. One scenario proposed to elevate C/O in VLMS inner discs is the advection of O-depleted gas from the outer disc. However, if CO gas remains abundant, C/O can be at most ~1. We test if chemical transformation of CO into other species allows this transport scenario to produce C/O signif…

World of Good Brands, formerly Leaf Group, shuts down after owner Graham Holdings sold off its last three titles; Graham Holdings acquired it in 2021 for $323M (Mark Stenberg/Adweek)
https://www.adweek.com/media/world-of-good-brands-sale-well-good-ziff-davis/

World of Good Brands Sells Off Portfolio, Lays Off Staff, and Shutters 
The closure represents the end of the digital media company once known as Intent Media.

MachineLearningLM: Continued Pretraining Language Models on Millions of Synthetic Tabular Prediction Tasks Scales In-Context ML
Haoyu Dong, Pengkun Zhang, Mingzhe Lu, Yanzhen Shen, Guolin Ke
https://arxiv.org/abs/2509.06806

MachineLearningLM: Continued Pretraining Language Models on Millions of Synthetic Tabular Prediction Tasks Scales In-Context ML
Large language models (LLMs) possess broad world knowledge and strong general-purpose reasoning ability, yet they struggle to learn from many in-context examples on standard machine learning (ML) tasks, that is, to leverage many-shot demonstrations purely via in-context learning (ICL) without gradient descent. We introduce MachineLearningLM, a portable continued-pretraining framework that equips a general-purpose LLM with robust in-context ML capability while preserving its general knowledge an…

Protoplanetary Disk Survival Time-scales: A Blind Survey of Young Clusters up to 100 Myr in the Solar Vicinity
Gregory Mathews Ben, Jessy Jose, Jes\'us Hern\'andez
https://arxiv.org/abs/2507.01619

Protoplanetary Disk Survival Time-scales: A Blind Survey of Young Clusters up to 100 Myr in the Solar Vicinity
We study the protoplanetary disk lifetimes using a large sample of young stellar objects in nearby clusters. To investigate the final phase of disk dissipation, we selected 32 clusters, located within 500 pc and aged between 1 and 100 Myr, with membership determined using Gaia data. The Age and mass information of the sources are obtained through spectral energy distribution (SED) analysis and using evolutionary models of various ages. Using the IR data from 2MASS and WISE catalogues, we employ…

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18 years experience and am open to new challenges!
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CV/Resume on request

Block Communications enters into an agreement to sell its entire portfolio of TV stations to Gray Media for $80M; the deal is expected to close in Q4 2025 (Matthew Keys/TheDesk.net)
https://thedesk.net/2025/08/gray-media-acquiring-block-communications-tv-st…

Block Communications sells TV stations to Gray Media
Block Communications has entered into an agreement to sell its entire portfolio of television stations to Gray Media, the companies announced on Friday.

Synchronous Rotation in the (120347) Salacia-Actaea System
Cameron Collyer, Estela Fernandez-Valenzuela, Jose Luis Ortiz, Bryan J. Holler, Benjamin Proudfoot, Nicolas Morales, Rafael Morales, Susan Benecchi, Flavia L. Rommel, Will Grundy, Darin Ragozzine
https://arxiv.org/abs/2509.02734

Synchronous Rotation in the (120347) Salacia-Actaea System
We report on roughly 16 years of photometric monitoring of the transneptunian binary system (120347) Salacia-Actaea which provides significant evidence that Salacia and Actaea are tidally locked to the mutual orbital period in a fully synchronous configuration. The orbit of Actaea is updated, followed by a Lomb-Scargle periodogram analysis of the ground-based photometry which reveals a synodic period similar to the orbital period and a peak-to-peak lightcurve amplitude of δm = 0.0900 {\pm} 0.0…

Cosmic cascades: How disk substructure regulates the flow of water to inner planetary systems
Sebastiaan Krijt, Andrea Banzatti, Ke Zhang, Paola Pinilla, Till Kaeufer, Edwin A. Bergin, Colette Salyk, Klaus Pontoppidan, Geoffrey A. Blake, Feng Long, Jane Huang, Mar\'ia Jos\'e Colmenares, Joe Williams, Adrien Houge, Mayank Narang, Miguel Vioque, Michiel Lambrechts, L. Ilsedore Cleeves, Karin \"Oberg, the JDISCS collaboration

Cosmic cascades: How disk substructure regulates the flow of water to inner planetary systems
The influx of icy pebbles to the inner regions of protoplanetary disks constitutes a fundamental ingredient in most planet formation theories. The observational determination of the magnitude of this pebble flux and its dependence on disk substructure (disk gaps as pebble traps) would be a significant step forward. In this work we analyze a sample of 21 T Tauri disks (with ages $\approx 0.5{-}2\mathrm{~Myr}$) using JWST/MIRI spectra homogeneously reduced with the JDISCS pipeline and high-angula…

Understanding JWST water spectra: what can thermochemical models tell us about the (cold) water in protoplanetary disks?
Marissa Vlasblom, Milou Temmink, Andrew D. Sellek, Ewine F. van Dishoeck
https://arxiv.org/abs/2509.06494

Understanding JWST water spectra: what can thermochemical models tell us about the (cold) water in protoplanetary disks?
(Abridged) Rotational H$_2$O spectra as observed with JWST/MIRI provide a good probe of the temperature and column density structure of the inner disk. H$_2$O emission can also be influenced by dynamical processes, such as dust grains drifting inwards and their icy mantles sublimating once they cross the snowlines, thus enriching the inner regions in H$_2$O vapor. Recent work has found that this process may leave an imprint in the H$_2$O spectrum in the form of excess flux in the cold H$_2$O li…

JWST/NIRSpec Observations of Salacia-Actaea and M\'ani: Exploring Population-level Trends among Water-ice-rich Kuiper Belt Objects
Ian Wong, Bryan J. Holler, Silvia Protopapa, Aur\'elie Guilbert-Lepoutre, William M. Grundy, John A. Stansberry, Heidi B. Hammel, Stefanie N. Milam, Rosario Brunetto, Joshua P. Emery, Estela Fern\'andez-Valenzuela, Noem\'i Pinilla-Alonso

JWST/NIRSpec Observations of Salacia-Actaea and Máni: Exploring Population-level Trends among Water-ice-rich Kuiper Belt Objects
We present observations of the mid-sized Kuiper belt objects (KBOs) Salacia-Actaea and Máni, obtained with the Near-Infrared Spectrograph on JWST. The satellite Actaea was fully blended with Salacia at the spatial resolution of the integral field unit, and we extracted the combined spectrum. The 0.7-5.1 ${\mathrm μ}$m reflectance spectra of Salacia-Actaea and Máni display prominent water-ice absorption bands at 1.5, 2, 3, and 4-5 ${\mathrm μ}$m. The $ν_3$ fundamental vibrational band of ca…