Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 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 percent. A standard explanation
is that dippers host nearly edge-on (70 deg) protoplanetary discs that allow
close-in (< 1 au) dust lifted slightly out of the midplane 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 0-75 deg, above which the occurrence rate
declines (likely an observational selection effect due to optically thick disc
midplanes 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.

14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph