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Infrared variability of young solar analogues in the Lagoon Nebula

Ordenes-Huanca, C. and Zoccali, M. and Bayo, A. and Cuadra, J. and Contreras Ramos, R. and Hillenbrand, L. A. and Lacerna, I. and Abarzua, S. and Avendaño, C. and Diaz, P. and Fernandez, I. and Lara, G. (2022) Infrared variability of young solar analogues in the Lagoon Nebula. Monthly Notices of the Royal Astronomical Society, 517 (4). pp. 6191-6204. ISSN 0035-8711. doi:10.1093/mnras/stac3049.

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T Tauri stars are low-mass pre-main sequence stars that are intrinsically variable. Due to the intense magnetic fields they possess, they develop dark spots on their surface that, because of rotation, introduce a periodic variation of brightness. In addition, the presence of surrounding discs could generate flux variations by variable extinction or accretion. Both can lead to a brightness decrease or increase, respectively. Here, we have compiled a catalogue of light curves for 379 T Tauri stars in the Lagoon Nebula (M8) region, using VVVX survey data in the Kₛ-band. All these stars were already classified as pre-MS stars based on other indicators. The data presented here are spread over a period of about eight years, which gives us a unique follow-up time for these sources at this wavelength. The light curves were classified according to their degree of periodicity and asymmetry, to constrain the physical processes responsible for their variation. Periods were compared with the ones found in literature, on a much shorter baseline. This allowed us to prove that for 126 stars, the magnetically active regions remain stable for several years. Besides, our near-IR data were compared with the optical Kepler/K2 light curves, when available, giving us a better understanding of the mechanisms responsible for the brightness variations observed and how they manifest at different bands. We found that the periodicity in both bands is in fairly good agreement, but the asymmetry will depend on the amplitude of the bursts or dips events and the observation cadence.

Item Type:Article
Related URLs:
URLURL TypeDescription
Zoccali, M.0000-0002-5829-2267
Bayo, A.0000-0001-7868-7031
Cuadra, J.0000-0003-1965-3346
Lacerna, I.0000-0002-7802-7356
Additional Information:COH acknowledges the support from National Agency for Research and Development (ANID), Scholarship Program Doctorado Nacional 2018-21180315. This project was funded by ANID FONDECYT Regular 1191505, ANID Millennium Institute of Astrophysics (MAS) under grant ICN12_009, the ANID BASAL Center for Astrophysics and Associated Technologies (CATA) through grants AFB170002, ACE210002 and FB210003, and ANID, – Millennium Science Initiative Program – NCN19_171. In addition, this project was partially funded by the Max Planck Society through a ‘Partner Group’ grant. We gratefully acknowledge the use of data from the VVV ESO Public Survey program ID 179.B-2002 taken with the VISTA telescope, and data products from the Cambridge Astronomical Survey Unit (CASU). The VVV Survey data are made public at the ESO Archive. Based on observations taken within the ESO VISTA Public Survey VVV, Program ID 179.B-2002. We also thank Laura Venuti, who provided us with Kepler/K2 data of sources that we had in common with her study in the M8 region. This publication uses data generated via the platform, development of which is funded by generous support, including a Global Impact Award from Google, and by a grant from the Alfred P. Sloan Foundation.
Group:Astronomy Department
Funding AgencyGrant Number
Agencia Nacional de Investigación y Desarrollo (ANID)2018-21180315
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1191505
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)ICN12_009
Agencia Nacional de Investigación y Desarrollo (ANID)ACE210002
Agencia Nacional de Investigación y Desarrollo (ANID)FB210003
Agencia Nacional de Investigación y Desarrollo (ANID)NCN19_171
Max Planck SocietyUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Issue or Number:4
Record Number:CaltechAUTHORS:20221219-417430800.32
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:118504
Deposited By: Research Services Depository
Deposited On:25 Jan 2023 15:54
Last Modified:25 Jan 2023 18:31

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