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The disappearing act: a dusty wind eclipsing RW Aur

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Scholz_2016_MNRAS_RWAur_FinalPubVersion.pdf (1.830Mb)
Date
21/12/2016
Author
Bozhinova, I.
Scholz, A.
Costigan, G.
Lux, O.
Davis, C. J.
Ray, T.
Boardman, N. F.
Hay, K. L.
Hewlett, T.
Hodosán, G.
Morton, B.
Funder
Science & Technology Facilities Council
Economic & Social Research Council
NERC
Grant ID
ST/M001296/1
RES-187-24-0014
NE/N016009/1
Keywords
Eclipses
Stars: pre-main-sequence
Stars: variables: T Tauri, Herbig Ae/Be
QB Astronomy
QC Physics
NDAS
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Abstract
RW Aur is a young binary star that experienced a deep dimming in 2010-11in component A and a second even deeper dimming from summer 2014 to summer 2016. We present new unresolved multi-band photometry during the 2014-16 eclipse, new emission line spectroscopy before and during th dimming, archive infrared photometry between 2014-15, as well as an overview of literature data. Spectral observations were carried out witht he Fibre-fed RObotic Dual-beam Optical Spectrograph on the Liverpool Telescope. Photometric monitoring was done with the Las Cumbres Observatory Global Telescope Network and James Gregory Telescope. Ourphotometry shows that RW Aur dropped in brightness to R = 12.5 in March 2016. In addition to the long-term dimming trend, RW Aur is variable on time-scales as short as hours. The short-term variation is most likely due to an unstable accretion flow. This, combined with the presence of accretion-related emission lines in the spectra suggest that accretion flows in the binary system are at least partially visible during the eclipse. The equivalent width of [O I] increases by a factor of ten in 2014, coinciding with the dimming event, confirming previous reports.The blueshifted part of the Hα profile is suppressed during the eclipse. In combination with the increase in mid-infrared brightness during the eclipse reported in the literature and seen in WISE archival data, and constraints on the geometry of the disk around RW Aur A we arrive at the conclusion that the obscuring screen is part of a wind emanating from the inner disc.
Citation
Bozhinova , I , Scholz , A , Costigan , G , Lux , O , Davis , C J , Ray , T , Boardman , N F , Hay , K L , Hewlett , T , Hodosán , G & Morton , B 2016 , ' The disappearing act: a dusty wind eclipsing RW Aur ' , Monthly Notices of the Royal Astronomical Society , vol. 463 , no. 4 , pp. 4459-4468 . https://doi.org/10.1093/mnras/stw2327
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/stw2327
ISSN
0035-8711
Type
Journal article
Rights
© 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at: https://dx.doi.org/10.1093/mnras/stw2327
Description
The authors acknowledge support from the Science and Technology Facilities Council through grants no. ST/K502339/1 and ST/M001296/1, and the Science Foundation Ireland through grant no. 10/RFP/AST2780.
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URL
http://adsabs.harvard.edu/abs/2016MNRAS.463.4459B
URI
http://hdl.handle.net/10023/9933

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