Twenty-five Years of Accretion onto the Classical T Tauri Star TW Hya

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dc.citation.articleNumber102en_US
dc.citation.issueNumber2en_US
dc.citation.journalTitleThe Astrophysical Journalen_US
dc.citation.volumeNumber956en_US
dc.contributor.authorHerczeg, Gregory J.en_US
dc.contributor.authorChen, Yuguangen_US
dc.contributor.authorDonati, Jean-Francoisen_US
dc.contributor.authorDupree, Andrea K.en_US
dc.contributor.authorWalter, Frederick M.en_US
dc.contributor.authorHillenbrand, Lynne A.en_US
dc.contributor.authorJohns-Krull, Christopher M.en_US
dc.contributor.authorManara, Carlo F.en_US
dc.contributor.authorGünther, Hans Moritzen_US
dc.contributor.authorFang, Minen_US
dc.contributor.authorSchneider, P. Christianen_US
dc.contributor.authorValenti, Jeff A.en_US
dc.contributor.authorAlencar, Silvia H. P.en_US
dc.contributor.authorVenuti, Lauraen_US
dc.contributor.authorAlcalá, Juan Manuelen_US
dc.contributor.authorFrasca, Antonioen_US
dc.contributor.authorArulanantham, Nicoleen_US
dc.contributor.authorLinsky, Jeffrey L.en_US
dc.contributor.authorBouvier, Jeromeen_US
dc.contributor.authorBrickhouse, Nancy S.en_US
dc.contributor.authorCalvet, Nuriaen_US
dc.contributor.authorEspaillat, Catherine C.en_US
dc.contributor.authorCampbell-White, Justynen_US
dc.contributor.authorCarpenter, John M.en_US
dc.contributor.authorChang, Seok-Junen_US
dc.contributor.authorCruz, Kelle L.en_US
dc.contributor.authorDahm, S. E.en_US
dc.contributor.authorEislöffel, Jochenen_US
dc.contributor.authorEdwards, Suzanen_US
dc.contributor.authorFischer, William J.en_US
dc.contributor.authorGuo, Zhenen_US
dc.contributor.authorHenning, Thomasen_US
dc.contributor.authorJi, Taoen_US
dc.contributor.authorJose, Jessyen_US
dc.contributor.authorKastner, Joel H.en_US
dc.contributor.authorLaunhardt, Ralfen_US
dc.contributor.authorPrincipe, David A.en_US
dc.contributor.authorRobinson, Connor E.en_US
dc.contributor.authorSerna, Javieren_US
dc.contributor.authorSiwak, Michalen_US
dc.contributor.authorSterzik, Michael F.en_US
dc.contributor.authorTakasao, Shinsukeen_US
dc.date.accessioned2024-05-03T15:51:01Zen_US
dc.date.available2024-05-03T15:51:01Zen_US
dc.date.issued2023en_US
dc.description.abstractAccretion plays a central role in the physics that governs the evolution and dispersal of protoplanetary disks. The primary goal of this paper is to analyze the stability over time of the mass accretion rate onto TW Hya, the nearest accreting solar-mass young star. We measure veiling across the optical spectrum in 1169 archival high-resolution spectra of TW Hya, obtained from 1998–2022. The veiling is then converted to accretion rate using 26 flux-calibrated spectra that cover the Balmer jump. The accretion rate measured from the excess continuum has an average of 2.51 × 10−9 M ⊙ yr−1 and a Gaussian distribution with an FWHM of 0.22 dex. This accretion rate may be underestimated by a factor of up to 1.5 because of uncertainty in the bolometric correction and another factor of 1.7 because of excluding the fraction of accretion energy that escapes in lines, especially Lyα. The accretion luminosities are well correlated with He line luminosities but poorly correlated with Hα and Hβ luminosity. The accretion rate is always flickering over hours but on longer timescales has been stable over 25 years. This level of variability is consistent with previous measurements for most, but not all, accreting young stars.en_US
dc.identifier.citationHerczeg, G. J., Chen, Y., Donati, J.-F., Dupree, A. K., Walter, F. M., Hillenbrand, L. A., Johns-Krull, C. M., Manara, C. F., Günther, H. M., Fang, M., Schneider, P. C., Valenti, J. A., Alencar, S. H. P., Venuti, L., Alcalá, J. M., Frasca, A., Arulanantham, N., Linsky, J. L., Bouvier, J., … Takasao, S. (2023). Twenty-five Years of Accretion onto the Classical T Tauri Star TW Hya. The Astrophysical Journal, 956(2), 102. https://doi.org/10.3847/1538-4357/acf468en_US
dc.identifier.digitalHerczeg_2023_ApJ_956_102en_US
dc.identifier.doihttps://doi.org/10.3847/1538-4357/acf468en_US
dc.identifier.urihttps://hdl.handle.net/1911/115497en_US
dc.language.isoengen_US
dc.publisherIOP Publishing Ltden_US
dc.rightsExcept where otherwise noted, this work is licensed under a Creative Commons Attribution (CC BY) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.titleTwenty-five Years of Accretion onto the Classical T Tauri Star TW Hyaen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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