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Are inner disc misalignments common? ALMA reveals an isotropic outer disc inclination distribution for young dipper stars
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Ansdell, M., Gaidos, E., Hedges, C., Tazzari, M., Kraus, A. L., Wyatt, M. C., Kennedy, Grant M., Williams, J. P., Mann, A. W., Angelo, I., Dûchene, G., Mamajek, E. E., Carpenter, J., Esplin, T. L. and Rizzuto, A. C. (2020) Are inner disc misalignments common? ALMA reveals an isotropic outer disc inclination distribution for young dipper stars. Monthly Notices of the Royal Astronomical Society, 492 (1). pp. 572-588. doi:10.1093/mnras/stz3361 ISSN 1745-3933.
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WRAP-inner-disc-misalignments-common-isotropic-dipper-stars-Kennedy-2020.pdf - Accepted Version - Requires a PDF viewer. Download (2681Kb) | Preview |
Official URL: http://dx.doi.org/10.1093/mnras/stz3361
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 (id ≈ 70°) 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 id ≈ 0−75°, 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.
Item Type: | Journal Article | ||||||||||||||||||||||||
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Subjects: | Q Science > QB Astronomy | ||||||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Astrophysics, Ursa Major, Constellations, Double stars | ||||||||||||||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||||||||||||||||
Publisher: | Oxford University Press | ||||||||||||||||||||||||
ISSN: | 1745-3933 | ||||||||||||||||||||||||
Official Date: | February 2020 | ||||||||||||||||||||||||
Dates: |
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Volume: | 492 | ||||||||||||||||||||||||
Number: | 1 | ||||||||||||||||||||||||
Page Range: | pp. 572-588 | ||||||||||||||||||||||||
DOI: | 10.1093/mnras/stz3361 | ||||||||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||||||||
Reuse Statement (publisher, data, author rights): | This is a pre-copyedited, author-produced PDF of an article accepted for publication in MNRAS following peer review. The version of record 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, is available online at: http://dx.doi.org/10.1093/mnras/stz3361 | ||||||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||||||||
Date of first compliant deposit: | 28 January 2020 | ||||||||||||||||||||||||
Date of first compliant Open Access: | 28 January 2020 | ||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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