The Comprehensive Archive of Substellar and Planetary Accretion Rates
S. K. Betti, K. B. Follette, K. Ward-Duong, A. E. Peck, Y. Aoyama, J., Bary, B. Dacus, S. Edwards, G.-D. Marleau, K. Mohamed, J. Palmo, C. Plunkett,, C. Robinson, H. Wang

TL;DR
This paper compiles the largest dataset of substellar accretion rates, analyzes methodological effects, and finds that accretion rates depend on mass and age, with brown dwarfs evolving faster than stars.
Contribution
It presents CASPAR, the largest compilation of substellar accretion data, and provides new age-dependent accretion relations separating brown dwarfs and stars.
Findings
Methodological systematics minimally affect the scatter in the $\dot{M}-M$ relation.
Accretion rate scales as $M^{2.02}$ across a wide mass range.
Brown dwarfs show a steeper, age-dependent $\dot{M}-M$ relation, indicating faster evolution.
Abstract
Accretion rates () of young stars show a strong correlation with object mass (); however, extension of the relation into the substellar regime is less certain. Here, we present the Comprehensive Archive of Substellar and Planetary Accretion Rates (CASPAR), the largest to-date compilation of substellar accretion diagnostics. CASPAR includes: 658 stars, 130 brown dwarfs, and 10 bound planetary mass companions. In this work, we investigate the contribution of methodological systematics to scatter in the relation, and compare brown dwarfs to stars. In our analysis, we rederive all quantities using self-consistent models, distances, and empirical line flux to accretion luminosity scaling relations to reduce methodological systematics. This treatment decreases the original scatter in the relation by %, suggesting that…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Isotope Analysis in Ecology · Astro and Planetary Science
