Simultaneous Far-ultraviolet and Near-ultraviolet Observations of T Tauri Stars with UVIT/AstroSat: Probing the Accretion Process in Young Stars

Simple item page
dc.contributor.authorNayak, Prasanta K.
dc.contributor.authorNarang, Mayank
dc.contributor.authorManoj, P.
dc.contributor.authorGorti, Uma
dc.contributor.authorSubramaniam, Annapurni
dc.contributor.authorGeorge, Nayana
dc.contributor.authorMondal, Chayan
dc.date.accessioned2025-01-20T16:10:23Z
dc.date.available2025-01-20T16:10:23Z
dc.date.issued2024
dc.description.abstractWe present results from simultaneous far-ultraviolet (FUV) and near-ultraviolet (NUV) observations of T Tauri stars (TTSs) in the Taurus molecular cloud with UVIT/AstroSat. This is the very first UVIT study of TTSs. From the spectral energy distribution of TTSs from FUV to IR, we show that classical TTSs (CTTSs) emit significantly higher UV excess compared to weak-line TTSs (WTTSs). The equivalent blackbody temperatures corresponding to the UV excess in CTTSs (>10(4) K) are also found to be relatively higher than those in WTTSs (<9250 K). From the UV excess, we have reclassified two WTTSs (BS Tau and V836 Tau) as CTTSs, which has been supported by the follow-up optical spectroscopic study using the Himalayan Chandra Telescope, showing strong H alpha line emission. We find that CTTSs show strong excess emission in both the FUV (>10(7)) and NUV (>10(3)) bands, while WTTSs show strong excess only in the FUV (less than or similar to 10(5)), suggesting that excess emission in the NUV can be used as a tool to classify the TTSs. We also find a linear correlation between UV luminosity (a primary indicator of mass accretion) and H alpha luminosity (a secondary indicator of mass accretion) with a slope of 1.20 +/- 0.22 and intercept of 2.16 +/- 0.70.
dc.description.funderCentro de Astrofisica y Tecnologias Afines (CATA) fellowship via grant Agencia Nacional de Investigacion y Desarrollo (ANID)
dc.fuente.origenWOS
dc.identifier.doi10.3847/1538-4357/ad5a89
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://doi.org/10.3847/1538-4357/ad5a89
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/90209
dc.identifier.wosidWOS:001296524200001
dc.issue.numero1
dc.language.isoen
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.titleSimultaneous Far-ultraviolet and Near-ultraviolet Observations of T Tauri Stars with UVIT/AstroSat: Probing the Accretion Process in Young Stars
dc.typeartículo
dc.volumen972
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
Files
Collections
Artículos de revistas