Monitoring the young planet host V1298 Tau with SPIRou: planetary system and evolving large-scale magnetic field

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dc.creatorBenjamin Finociety
dc.creatorJean-Francois Donati
dc.creatorPaul Cristofari
dc.creatorClaire Moutou
dc.creatorCharles Cadieux
dc.creatorNeil James Cook
dc.creatorEtienne Artigau
dc.creatorClément Baruteau
dc.creatorFlorian Debras
dc.creatorPascal Fouqué
dc.creatorJerome Bouvier
dc.creatorSilvia Helena Paixão Alencar
dc.creatorXavier Delfosse
dc.creatorKonstantin Grankin
dc.creatorAndres Carmona
dc.creatorAntoine Petit
dc.creatorÁgnes Kóspál
dc.date.accessioned2025-02-04T14:20:51Z
dc.date.accessioned2025-09-09T00:20:01Z
dc.date.available2025-02-04T14:20:51Z
dc.date.issued2023-10-05
dc.format.mimetypepdf
dc.identifier.doihttps://doi.org/10.1093/mnras/stad3012
dc.identifier.issn0035-8711
dc.identifier.urihttps://hdl.handle.net/1843/79642
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rightsAcesso Aberto
dc.subjectCampos magnéticos
dc.subjectEstrelas jovens
dc.subjectEstrelas - Campos magnéticos
dc.subjectPlanetários
dc.subject.otherTechniques: polarimetric
dc.subject.otherStars: formation
dc.subject.otherStars: imaging
dc.subject.otherStars: individual: V1298 Tau
dc.subject.otherStars: magnetic field
dc.subject.otherStars: planetary system
dc.titleMonitoring the young planet host V1298 Tau with SPIRou: planetary system and evolving large-scale magnetic field
dc.typeArtigo de periódico
local.citation.epage4672
local.citation.issue3
local.citation.spage4627
local.citation.volume526
local.description.resumoWe report results of a spectropolarimetric monitoring of the young Sun-like star V1298 Tau based on data collected with the near-infrared spectropolarimeter SPIRou at the Canada–France–Hawaii Telescope between late 2019 and early 2023. Using Zeeman–Doppler Imaging and the Time-dependent Imaging of Magnetic Stars methods on circularly polarized spectra, we reconstructed the large-scale magnetic topology of the star (and its temporal evolution), found to be mainly poloidal and axisymmetric with an average strength varying from 90 to 170 G over the ∼3.5 yr of monitoring. The magnetic field features a dipole whose strength evolves from 85 to 245 G, and whose inclination with respect to the stellar rotation axis remains stable until 2023 where we observe a sudden change, suggesting that the field may undergo a polarity reversal, potentially similar to those periodically experienced by the Sun. Our data suggest that the differential rotation shearing the surface of V1298 Tau is about 1.5 times stronger than that of the Sun. When coupling our data with previous photometric results from K2 and TESS and assuming circular orbits for all four planets, we report a 3.9σ detection of the radial velocity signature of the outermost planet (e), associated with a most probable mass, density, and orbital period of Me = 0.95+0.33 −0.24 M, ρe = 1.66+0.61 −0.48 g cm−3, and Pe =53.0039 ± 0.0001 d, respectively. For the three inner planets, we only derive 99 per cent confidence upper limits on their mass of 0.44, 0.22, and 0.25 M, for b, c, and d, respectively.
local.identifier.orcidhttps://orcid.org/0000-0001-7625-0311
local.identifier.orcidhttps://orcid.org/0000-0001-5541-2887
local.identifier.orcidhttps://orcid.org/0000-0003-4019-0630
local.identifier.orcidhttps://orcid.org/0000-0002-2842-3924
local.identifier.orcidhttps://orcid.org/0000-0001-9291-5555
local.identifier.orcidhttps://orcid.org/0000-0003-4166-4121
local.identifier.orcidhttps://orcid.org/0000-0003-3506-5667
local.identifier.orcidhttps://orcid.org/0000-0002-2672-3456
local.identifier.orcidhttps://orcid.org/0000-0002-3113-4840
local.identifier.orcidhttps://orcid.org/0000-0002-1436-7351
local.identifier.orcidhttps://orcid.org/0000-0002-7450-6712
local.identifier.orcidhttps://orcid.org/0000-0002-5171-8376
local.identifier.orcidhttps://orcid.org/0000-0001-5099-7978
local.identifier.orcidhttps://orcid.org/0000-0001-5707-8448
local.identifier.orcidhttps://orcid.org/0000-0003-2471-1299
local.identifier.orcidhttps://orcid.org/0000-0003-1970-1790
local.identifier.orcidhttps://orcid.org/0000-0001-7157-6275
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.initialsUFMG
local.url.externahttps://academic.oup.com/mnras/article/526/3/4627/7291934?login=true

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