Are inner disc misalignments common? ALMA reveals an isotropic outer disc inclination distribution for young dipper stars
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 (10 au) disc resolved by ALMA and that inner disc misalignments...
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| Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2020-02, Vol.492 (1), p.572-588 |
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| container_title | Monthly notices of the Royal Astronomical Society |
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| creator | Ansdell, M Gaidos, 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 |
| description | 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 (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. |
| doi_str_mv | 10.1093/mnras/stz3361 |
| format | Article |
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ALMA reveals an isotropic outer disc inclination distribution for young dipper stars</title><source>Oxford Journals Open Access Collection</source><creator>Ansdell, M ; Gaidos, 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</creator><creatorcontrib>Ansdell, M ; Gaidos, 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</creatorcontrib><description>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. 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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. 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ALMA reveals an isotropic outer disc inclination distribution for young dipper stars</atitle><jtitle>Monthly notices of the Royal Astronomical Society</jtitle><date>2020-02-01</date><risdate>2020</risdate><volume>492</volume><issue>1</issue><spage>572</spage><epage>588</epage><pages>572-588</pages><issn>0035-8711</issn><eissn>1365-2966</eissn><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. 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| subjects | Astrophysics Sciences of the Universe |
| title | Are inner disc misalignments common? ALMA reveals an isotropic outer disc inclination distribution for young dipper stars |
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