RESEARCH
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Accretion in low-mass members of the Orion Nebula Cluster with young transition disks

R. M. G. Albuquerque, J. F. Gameiro, S. Alencar, J. J. G. Lima, C. Sauty, C. Melo

Abstract
Context. Although the Orion Nebula Cluster is one of the most studied clusters in the solar neighborhood, the evolution of the very low-mass members (M* < 0.25 M) has not been fully addressed due to their faintness.
Aims. Our goal is to verify if some young and very low-mass objects in the Orion Nebula Cluster show evidence of ongoing accretion using broadband VLT/X-shooter spectra.
Methods. For each target, we determined the corresponding stellar parameters, veiling, observed Balmer jump, and accretion rates. Additionally, we searched for the existence of circumstellar disks through available on-line photometry.
Results. We detected accretion activity in three young stellar objects in the Orion Nebula Cluster, two of them being in the very low-mass range. We also detected the presence of young transition disks with ages between 1 and 3.5 Myr.

Keywords
stars: low-mass; stars: pre-main sequence; open clusters and associations: individual: Orion Nebula Cluster; Astrophysics - Solar and Stellar Astrophysics; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Astrophysics of Galaxies

Astronomy and Astrophysics
Volume 636, Article Number A86, Number of pages 16
2020 April

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Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia