Stable accretion and episodic outflows in the young transition disk system GM Aurigae: a semester-long optical and near-infrared spectrophotometric monitoring campaign

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dc.creatorJerome Bouvier
dc.creatorAlana Sousa
dc.creatorKim Pouilly
dc.creatorJose Manuel Almenara Villa
dc.creatorJean-François Donati
dc.creatorSilvia Helena Paixão Alencar
dc.creatorAntonio Frasca
dc.creatorJorge Filipe Gameiro
dc.creatorKonstantin Grankin
dc.creatorJean-francois Donati
dc.creatorSilvia Helena Paixao Alencar
dc.creatorAndres Carmona
dc.creatorGeorge Pantolmos
dc.creatorBonnie Zaire
dc.creatorXavier Bonfils
dc.creatorAmelia Bayo
dc.creatorLuisa Rebull
dc.creatorJavier Alonso-Santiago
dc.creatorJorge Filipe Gameiro
dc.creatorNeil James Cook
dc.creatorEtienne Artigau
dc.date.accessioned2025-01-24T22:19:42Z
dc.date.accessioned2025-09-09T01:05:56Z
dc.date.available2025-01-24T22:19:42Z
dc.date.issued2023-03-23
dc.format.mimetypepdf
dc.identifier.doihttps://doi.org/10.1051/0004-6361/202245342
dc.identifier.issn0004-6361
dc.identifier.urihttps://hdl.handle.net/1843/79487
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofAstronomy & Astrophysics
dc.rightsAcesso Aberto
dc.subjectVariabilidade fotométrica
dc.subjectEspectroscopia astronômica
dc.subjectFormação de estrelas
dc.subjectEstrelas
dc.subjectCampos magnéticos
dc.subject.otherAccretion
dc.subject.otherStars: magnetic field
dc.subject.otherAccretion disks
dc.subject.otherStars: individual
dc.subject.otherGM Aur
dc.subject.otherStars: pre-main sequence
dc.subject.otherStars: variables
dc.subject.otherT Tauri
dc.subject.otherHerbig Ae/Be
dc.subject.otherStars: winds
dc.subject.otherOutflows
dc.titleStable accretion and episodic outflows in the young transition disk system GM Aurigae: a semester-long optical and near-infrared spectrophotometric monitoring campaign
dc.typeArtigo de periódico
local.citation.epage30
local.citation.spage1
local.citation.volume672
local.description.resumoContext. Young stellar systems actively accrete from their circumstellar disk and simultaneously launch outflows. The physical link between accretion and ejection processes remains to be fully understood. Aims. We investigate the structure and dynamics of magnetospheric accretion and associated outflows on a scale smaller than 0.1 au around the young transitional disk system GM Aur. Methods. We devised a coordinated observing campaign to monitor the variability of the system on timescales ranging from days to months, including partly simultaneous high-resolution optical and near-infrared spectroscopy, multiwavelength photometry, and low-resolution near-infrared spectroscopy, over a total duration of six months, covering 30 rotational cycles. We analyzed the photometric and line profile variability to characterize the accretion and ejection processes. Results. The optical and near-infrared light curves indicate that the luminosity of the system is modulated by surface spots at the stellar rotation period of 6.04 ± 0.15 days. Part of the Balmer, Paschen, and Brackett hydrogen line profiles as well as the HeI 5876 Å and HeI 10830 Å line profiles are modulated on the same period. The Paβ line flux correlates with the photometric excess in the u′ band, which suggests that most of the line emission originates from the accretion process. High-velocity redshifted absorptions reaching below the continuum periodically appear in the near-infrared line profiles at the rotational phase in which the veiling and line fluxes are the largest. These are signatures of a stable accretion funnel flow and associated accretion shock at the stellar surface. This large-scale magnetospheric accretion structure appears fairly stable over at least 15 and possibly up to 30 rotational periods. In contrast, outflow signatures randomly appear as blueshifted absorption components in the Balmer and HeI 10830 Å line profiles. They are not rotationally modulated and disappear on a timescale of a few days. The coexistence of a stable, large-scale accretion pattern and episodic outflows supports magnetospheric ejections as the main process occurring at the star-disk interface. Conclusions. Long-term monitoring of the variability of the GM Aur transitional disk system provides clues to the accretion and ejection structure and dynamics close to the star. Stable magnetospheric accretion and episodic outflows appear to be physically linked on a scale of a few stellar radii in this system.
local.identifier.orcidhttps://orcid.org/0000-0002-7450-6712
local.identifier.orcidhttps://orcid.org/0000-0001-7397-8972
local.identifier.orcidhttps://orcid.org/0000-0002-9628-2959
local.identifier.orcidhttps://orcid.org/0000-0003-3208-9815
local.identifier.orcidhttps://orcid.org/0000-0001-5541-2887
local.identifier.orcidhttps://orcid.org/0000-0002-5171-8376
local.identifier.orcidhttps://orcid.org/0000-0002-0474-0896
local.identifier.orcidhttps://orcid.org/0000-0001-5707-8448
local.identifier.orcidhttps://orcid.org/0000-0003-2471-1299
local.identifier.orcidhttps://orcid.org/0000-0001-7788-3727
local.identifier.orcidhttps://orcid.org/0000-0002-9328-9530
local.identifier.orcidhttps://orcid.org/0000-0001-9003-8894
local.identifier.orcidhttps://orcid.org/0000-0001-7868-7031
local.identifier.orcidhttps://orcid.org/0000-0001-6381-515X
local.identifier.orcidhttps://orcid.org/0000-0001-9707-3107
local.identifier.orcidhttps://orcid.org/0000-0002-1970-7001
local.identifier.orcidhttps://orcid.org/0000-0003-4166-4121
local.identifier.orcidhttps://orcid.org/0000-0003-3506-5667
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.initialsUFMG
local.url.externahttps://www.aanda.org/articles/aa/pdf/2023/04/aa45342-22.pdf

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