New insights into the near-infrared veiling of young stars using CFHT/SPIRou data

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dc.creatorAlana Sousa
dc.creatorJerome Bouvier
dc.creatorSilvia Helena Paixão Alencar
dc.creatorJean-Francois Donati
dc.creatorCatherine Dougados
dc.creatorJean-francois Donati
dc.creatorCatherine Dougados
dc.creatorEvelyne Alecian
dc.creatorAndres Carmona
dc.creatorLuisa Rebull
dc.creatorNeil James Cook
dc.creatorEtienne Artigau
dc.creatorPascal Fouqué
dc.creatorRene Doyon
dc.date.accessioned2025-02-04T14:55:48Z
dc.date.accessioned2025-09-08T23:46:27Z
dc.date.available2025-02-04T14:55:48Z
dc.date.issued2023-02-16
dc.format.mimetypepdf
dc.identifier.doihttps://doi.org/10.1051/0004-6361/202244720
dc.identifier.issn0004-6361
dc.identifier.urihttps://hdl.handle.net/1843/79643
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofAstronomy & Astrophysics
dc.rightsAcesso Aberto
dc.subjectFormação estelar
dc.subjectEstrelas
dc.subject.otherStars: pre-main sequence
dc.subject.otherAccretion
dc.subject.otherAccretion disks
dc.subject.otherStars: variables
dc.subject.otherT Tauri
dc.subject.otherHerbig Ae/Be
dc.titleNew insights into the near-infrared veiling of young stars using CFHT/SPIRou data
dc.typeArtigo de periódico
local.citation.epage12
local.citation.spage01
local.citation.volume670
local.description.resumoContext. Veiling is ubiquitous at different wavelength ranges in classical T Tauri stars. However, the origin of the veiling in the infrared (IR) domain is not well understood at present. The accretion spot alone is not enough to explain the shallow photospheric IR lines in accreting systems, suggesting that another source is contributing to the veiling in the near-infrared (NIR). The inner disk is often quoted as the additional emitting source meant to explain the IR veiling. Aims. In this work, we aim to measure and discuss the NIR veiling to understand its origins and variability timescale. Methods. We used a sample of 14 accreting stars observed with the CFHT/SPIRou spectrograph, within the framework of the SPIRou Legacy Survey, to measure the NIR veiling along the Y JHK bands. We compared the veiling measurements with accretion and inner disk diagnostics. We also analyzed circumstellar emission lines and photometric observations from the literature. Results. The measured veiling grows from the Y to the K band for most of the targets in our sample. The IR veiling agrees with NIR emission excess obtained using photometric data. However, we also find a linear correlation between the veiling and the accretion properties of the system, showing that accretion contributes to the inner disk heating and, consequently, to the inner disk emission excess. We also show a connection between the NIR veiling and the system’s inclination with respect to our line of sight. This is probably due to the reduction of the visible part of the inner disk edge, where the NIR emission excess is expected to arise, as the inclination of the system increases. Our search for periods on the veiling variability showed that the IR veiling is not clearly periodic in the typical timescale of stellar rotation – which, again, is broadly consistent with the idea that the veiling comes from the inner disk region. The NIR veiling appears variable on a timescale of a day, showing the night-by-night dynamics of the optical veiling variability. In the long term, the mean NIR veiling seems to be stable for most of the targets on timescales of a month to a few years. However, during occasional episodes of high accretion in classical T Tauri stars, which affect the system’s dynamic, the veiling also seems to be much more prominent at such times, as we found in the case of the target RU Lup. Conclusions. We provide further evidence that for most targets in our sample, the veiling that mainly occurs in the JHK bands arises
local.identifier.orcidhttps://orcid.org/0000-0001-7397-8972
local.identifier.orcidhttps://orcid.org/0000-0002-7450-6712
local.identifier.orcidhttps://orcid.org/0000-0002-5171-8376
local.identifier.orcidhttps://orcid.org/0000-0001-5541-2887
local.identifier.orcidhttps://orcid.org/0000-0001-6660-936X
local.identifier.orcidhttps://orcid.org/0000-0001-5260-7179
local.identifier.orcidhttps://orcid.org/0000-0003-2471-1299
local.identifier.orcidhttps://orcid.org/0000-0001-6381-515X
local.identifier.orcidhttps://orcid.org/0000-0003-4166-4121
local.identifier.orcidhttps://orcid.org/0000-0003-3506-5667
local.identifier.orcidhttps://orcid.org/0000-0002-1436-7351
local.identifier.orcidhttps://orcid.org/0000-0001-5485-4675
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.initialsUFMG
local.url.externahttps://www.aanda.org/articles/aa/pdf/2023/02/aa44720-22.pdf

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