Are inner disc misalignments common? ALMA reveals an isotropic outer disc inclination distribution for young dipper stars
Author
Ansdell, MGaidos, E
Hedges, C
Tazzari, M
Kraus, A L
Wyatt, M C
Kennedy, G M
Williams, J P
Mann, A W
Angelo, I
Dûchene, G
Mamajek, E E
Carpenter, J
Esplin, T L
Rizzuto, A C
Affiliation
Univ Arizona, Steward ObservIssue Date
2019-12-02Keywords
planet-star interactionsprotoplanetary discs
binaries: visual
stars: variables: T Tauri, Herbig Ae/Be
Metadata
Show full item recordPublisher
OXFORD UNIV PRESSCitation
M Ansdell, E Gaidos, C Hedges, M Tazzari, A L Kraus, M C Wyatt, G M Kennedy, J P Williams, A W Mann, I Angelo, G Dûchene, E E Mamajek, J Carpenter, T L Esplin, A C Rizzuto, Are inner disc misalignments common? ALMA reveals an isotropic outer disc inclination distribution for young dipper stars, Monthly Notices of the Royal Astronomical Society, Volume 492, Issue 1, February 2020, Pages 572–588, https://doi.org/10.1093/mnras/stz3361Rights
Copyright © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
Dippers are a common class of young variable star exhibiting day-long dimmings with depths of up to several tens of per cent. A standard explanation is that dippers host nearly edge-on (i(d) approximate to 70 degrees) protoplanetary discs that allow close-in (<1 au) dust lifted slightly out of the mid-plane to partially occult the star. The identification of a face-on dipper disc and growing evidence of inner disc misalignments brings this scenario into question. Thus, we uniformly (re)derive the inclinations of 24 dipper discs resolved with (sub-)mm interferometry from ALMA. We find that dipper disc inclinations are consistent with an isotropic distribution over i(d) approximate to 0-75 degrees, above which the occurrence rate declines (likely an observational selection effect due to optically thick disc mid-planes blocking their host stars). These findings indicate that the dipper phenomenon is unrelated to the outer (>10 au) disc resolved by ALMA and that inner disc misalignments may be common during the protoplanetary phase. More than one mechanism may contribute to the dipper phenomenon, including accretion-driven warps and 'broken' discs caused by inclined (sub-)stellar or planetary companions.ISSN
0035-8711Version
Final published versionae974a485f413a2113503eed53cd6c53
10.1093/mnras/stz3361