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  A measure of the size of the magnetospheric accretion region in TW Hydrae

Lopez, R. G., Natta, A., Caratti o Garatti, A., Ray, T. P., Fedriani, R., Koutoulaki, M., et al. (2020). A measure of the size of the magnetospheric accretion region in TW Hydrae. Nature, 584(7822), 547-550. doi:10.1038/s41586-020-2613-1.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-7F69-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-8885-9
Genre: Journal Article

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Lopez, R. Garcia, Author
Natta, A., Author
Caratti o Garatti, A. , Author
Ray, T. P., Author
Fedriani, R., Author
Koutoulaki, M., Author
Klarmann, L., Author
Perraut, K., Author
Sanchez-Bermudez, J., Author
Benisty, M., Author
Dougados, C., Author
Labadie, L., Author
Brandner, W., Author
Garcia, P. J. V., Author
Henning, Th., Author
Caselli, P.1, Author              
Duvert, G., Author
Zeeuw, T.2, Author              
Grellmann, R., Author
Abuter, R., Author
Amorim, A., AuthorBauböck, M., AuthorBerger, J. P., AuthorBonnet, H., AuthorBuron, A.3, Author              Clénet, Y., Authordu Foresto, V. Coudé, Authorde Wit, W., AuthorEckart, A., AuthorEisenhauer, F.2, Author              Filho, M., AuthorGao, F.2, Author              Dabo, C. E. Garcia, AuthorGendron, E., AuthorGenzel, R.2, Author              Gillessen, S.2, Author              Habibi, M.2, Author              Haubois, X., AuthorHaussmann, F.2, Author              Hippler, S., AuthorHubert, Z., AuthorHorrobin, M., AuthorJimenez Rosales, A.2, Author              Jocou, L., AuthorKervella, P., AuthorKolb, J., AuthorLacour, S., AuthorLe Bouquin, J.-B., AuthorLéna, P., AuthorOtt, T.2, Author              Paumard, T., AuthorPerrin, G., AuthorPfuhl, O., AuthorRamirez, A., AuthorRau, C., AuthorRousset, G., AuthorScheithauer, S., AuthorShangguan, J.2, Author              Stadler, J.2, Author              Straub, O.2, Author              Straubmeier, C., AuthorSturm, E.2, Author              Van Dishoeck, E.2, Author              Vincent, F., AuthorFellenberg, S. von2, Author              Widmann, F.2, Author              Wieprecht, E.2, Author              Wiest, M., AuthorWiezorrek, E.2, Author              Woillez, J., AuthorYazici, S.2, Author              Zins, G., Author more..
Affiliations:
1Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society, ou_1950287              
2Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              
3MPI for Extraterrestrial Physics, Max Planck Society, ou_159888              

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 Abstract: Stars form by accreting material from their surrounding disks. There is a consensus that matter flowing through the disk is channelled onto the stellar surface by the stellar magnetic field. This is thought to be strong enough to truncate the disk close to the corotation radius, at which the disk rotates at the same rate as the star. Spectro-interferometric studies in young stellar objects show that hydrogen emission (a well known tracer of accretion activity) mostly comes from a region a few milliarcseconds across, usually located within the dust sublimation radius. The origin of the hydrogen emission could be the stellar magnetosphere, a rotating wind or a disk. In the case of intermediate-mass Herbig AeBe stars, the fact that Brackett γ (Brγ) emission is spatially resolved rules out the possibility that most of the emission comes from the magnetosphere because the weak magnetic fields (some tenths of a gauss) detected in these sources result in very compact magnetospheres. In the case of T Tauri sources, their larger magnetospheres should make them easier to resolve. The small angular size of the magnetosphere (a few tenths of a milliarcsecond), however, along with the presence of winds make the interpretation of the observations challenging. Here we report optical long-baseline interferometric observations that spatially resolve the inner disk of the T Tauri star TW Hydrae. We find that the near-infrared hydrogen emission comes from a region approximately 3.5 stellar radii across. This region is within the continuum dusty disk emitting region (7 stellar radii across) and also within the corotation radius, which is twice as big. This indicates that the hydrogen emission originates in the accretion columns (funnel flows of matter accreting onto the star), as expected in magnetospheric accretion models, rather than in a wind emitted at much larger distance (more than one astronomical unit).

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Language(s): eng - English
 Dates: 2020-08-26
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1038/s41586-020-2613-1
 Degree: -

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Title: Nature
  Abbreviation : Nature
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 584 (7822) Sequence Number: - Start / End Page: 547 - 550 Identifier: ISSN: 0028-0836
CoNE: https://pure.mpg.de/cone/journals/resource/954925427238