X-shooter survey Across Regions and Ages to probe Disk Evolution (ARADE): Accretion properties in Orion A and their relation with disk masses
Abstract
We present a homogeneous VLT/X-Shooter study of accretion in young stellar objects spanning the entire Orion A complex. Our sample includes 91 pre-main-sequence stars hosting a protoplanetary disk according to Spitzer photometry, of which 34 have complementary ALMA dust mass measurements. We derived stellar and accretion properties using a self-consistent multi-component fitting procedure. Our sample encompasses spectral types from K3 down to M5, corresponding to stellar masses within ∼0.8-0.1 M⊙. The accretion-stellar luminosity (Lacc−L⋆) and the mass accretion rate-stellar mass (Ṁacc−M⋆) scaling relations in Orion A are consistent with those of other star-forming regions (SFRs) that span a range of stellar densities, far-ultraviolet (FUV) irradiation fields, and ages, with all regions occupying the same locus in parameter space. For the 34 sources with complementary dust mass measurements, we present the first investigation of the Ṁacc and disk mass (Mdisk) correlation in Orion A, recovering a spread consistent with that reported for other regions. Despite our sample spanning nearly five orders of magnitude in local FUV field strength, we find no statistically significant correlation between Ṁacc and FUV irradiation. However, by combining our sample with literature measurements in Lupus, the Orion Nebula Cluster, and σ Orionis, we find a tentative population-level decrease of the inferred disk lifetime tdisk =Mdisk/Ṁacc toward stronger FUV environments, though large intrinsic scatter and limited sample sizes at intermediate and high FUV fields prevent firm conclusions. The homogeneous Ṁacc measurements reported here provide a solid foundation for future studies of accretion and disk evolution across the diverse environments of Orion A and other SFRs.
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BibTeX
@misc{piscarreta2026xshooter,
title = {{X-shooter survey Across Regions and Ages to probe Disk Evolution (ARADE): Accretion properties in Orion A and their relation with disk masses}},
author = {Lara Piscarreta and Giacomo Beccari and Carlo Manara and Rossella Anania and Sierk van Terwisga and Victor Almendros-Abad and Henri Boffin and Rik Claes and Aaron Empey and Barbara Ercolano and Tereza Jerabkova and Karina Maucó and Miguel Vioque},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.00938},
eprint = {2609.00938},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.00938},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - X-shooter survey Across Regions and Ages to probe Disk Evolution (ARADE): Accretion properties in Orion A and their relation with disk masses
AU - Lara Piscarreta
AU - Giacomo Beccari
AU - Carlo Manara
AU - Rossella Anania
AU - Sierk van Terwisga
AU - Victor Almendros-Abad
AU - Henri Boffin
AU - Rik Claes
AU - Aaron Empey
AU - Barbara Ercolano
AU - Tereza Jerabkova
AU - Karina Maucó
AU - Miguel Vioque
PY - 2026
DA - 2026/09/01
PB - arXiv
DO - 10.48550/arxiv.2609.00938
UR - https://arxiv.org/abs/2609.00938
AB - We present a homogeneous VLT/X-Shooter study of accretion in young stellar objects spanning the entire Orion A complex. Our sample includes 91 pre-main-sequence stars hosting a protoplanetary disk according to Spitzer photometry, of which 34 have complementary ALMA dust mass measurements. We derived stellar and accretion properties using a self-consistent multi-component fitting procedure. Our sample encompasses spectral types from K3 down to M5, corresponding to stellar masses within ∼0.8-0.1 M_⊙. The accretion-stellar luminosity (L_acc−L_⋆) and the mass accretion rate-stellar mass (Ṁ_acc−M_⋆) scaling relations in Orion A are consistent with those of other star-forming regions (SFRs) that span a range of stellar densities, far-ultraviolet (FUV) irradiation fields, and ages, with all regions occupying the same locus in parameter space. For the 34 sources with complementary dust mass measurements, we present the first investigation of the Ṁ_acc and disk mass (M_disk) correlation in Orion A, recovering a spread consistent with that reported for other regions. Despite our sample spanning nearly five orders of magnitude in local FUV field strength, we find no statistically significant correlation between Ṁ_acc and FUV irradiation. However, by combining our sample with literature measurements in Lupus, the Orion Nebula Cluster, and σ Orionis, we find a tentative population-level decrease of the inferred disk lifetime t_disk =M_disk/Ṁ_acc toward stronger FUV environments, though large intrinsic scatter and limited sample sizes at intermediate and high FUV fields prevent firm conclusions. The homogeneous Ṁ_acc measurements reported here provide a solid foundation for future studies of accretion and disk evolution across the diverse environments of Orion A and other SFRs.
ER -