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

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dc.citation.articleNumber102
dc.citation.issueNumber2
dc.citation.journalTitleThe Astrophysical Journal
dc.citation.volumeNumber956
dc.contributor.authorHerczeg, Gregory J.
dc.contributor.authorChen, Yuguang
dc.contributor.authorDonati, Jean-Francois
dc.contributor.authorDupree, Andrea K.
dc.contributor.authorWalter, Frederick M.
dc.contributor.authorHillenbrand, Lynne A.
dc.contributor.authorJohns-Krull, Christopher M.
dc.contributor.authorManara, Carlo F.
dc.contributor.authorGünther, Hans Moritz
dc.contributor.authorFang, Min
dc.contributor.authorSchneider, P. Christian
dc.contributor.authorValenti, Jeff A.
dc.contributor.authorAlencar, Silvia H. P.
dc.contributor.authorVenuti, Laura
dc.contributor.authorAlcalá, Juan Manuel
dc.contributor.authorFrasca, Antonio
dc.contributor.authorArulanantham, Nicole
dc.contributor.authorLinsky, Jeffrey L.
dc.contributor.authorBouvier, Jerome
dc.contributor.authorBrickhouse, Nancy S.
dc.contributor.authorCalvet, Nuria
dc.contributor.authorEspaillat, Catherine C.
dc.contributor.authorCampbell-White, Justyn
dc.contributor.authorCarpenter, John M.
dc.contributor.authorChang, Seok-Jun
dc.contributor.authorCruz, Kelle L.
dc.contributor.authorDahm, S. E.
dc.contributor.authorEislöffel, Jochen
dc.contributor.authorEdwards, Suzan
dc.contributor.authorFischer, William J.
dc.contributor.authorGuo, Zhen
dc.contributor.authorHenning, Thomas
dc.contributor.authorJi, Tao
dc.contributor.authorJose, Jessy
dc.contributor.authorKastner, Joel H.
dc.contributor.authorLaunhardt, Ralf
dc.contributor.authorPrincipe, David A.
dc.contributor.authorRobinson, Connor E.
dc.contributor.authorSerna, Javier
dc.contributor.authorSiwak, Michal
dc.contributor.authorSterzik, Michael F.
dc.contributor.authorTakasao, Shinsuke
dc.date.accessioned2024-05-03T15:51:01Z
dc.date.available2024-05-03T15:51:01Z
dc.date.issued2023
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.
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/acf468
dc.identifier.digitalHerczeg_2023_ApJ_956_102
dc.identifier.doihttps://doi.org/10.3847/1538-4357/acf468
dc.identifier.urihttps://hdl.handle.net/1911/115497
dc.language.isoeng
dc.publisherIOP Publishing Ltd
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.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleTwenty-five Years of Accretion onto the Classical T Tauri Star TW Hya
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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