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Generating Stellar Obliquity in Systems with Broken Protoplanetary Disks

Epstein-Martin, Marguerite and Becker, Juliette and Batygin, Konstantin (2022) Generating Stellar Obliquity in Systems with Broken Protoplanetary Disks. Astrophysical Journal, 931 (1). Art. No. 42. ISSN 0004-637X. doi:10.3847/1538-4357/ac5b79.

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Recent advances in submillimeter observations of young circumstellar nebulae have opened an unprecedented window into the structure of protoplanetary disks that has revealed the surprising ubiquity of broken and misaligned disks. In this work, we demonstrate that such disks are capable of torquing the spin axis of their host star, representing a hitherto unexplored pathway by which stellar obliquities may be generated. The basis of this mechanism is a crossing of the stellar spin precession and inner disk regression frequencies, resulting in adiabatic excitation of the stellar obliquity. We derive analytical expressions for the characteristic frequencies of the inner disk and star as a function of the disk gap boundaries and place an approximate limit on the disk architectures for which frequency crossing and the resulting obliquity excitation are expected, thereby illustrating the efficacy of this model. Cumulatively, our results support the emerging consensus that significant spin–orbit misalignments are an expected outcome of planet formation.

Item Type:Article
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URLURL TypeDescription Paper
Epstein-Martin, Marguerite0000-0001-9310-7808
Becker, Juliette0000-0002-7733-4522
Batygin, Konstantin0000-0002-7094-7908
Additional Information:© 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2021 August 31; revised 2022 February 16; accepted 2022 March 4; published 2022 May 23. We would like to thank our referee, Rosemary Mardling, whose thoughtful insights significantly improved this work. J.C.B. has been supported by the Heising-Simons 51 Pegasi b postdoctoral fellowship. M.E.M. is supported by the Graduate Fellowship for STEM Diversity. This research is based in part upon work supported by NSF grant AST 2109276. K.B. thanks the David and Lucile Packard Foundation for their generous support. Software: pandas (McKinney 2010), IPython (Pérez & Granger 2007), matplotlib (Hunter 2007), scipy (Virtanen et al. 2020), numpy (Harris et al. 2020), Jupyter (Kluyver et al. 2016), Mathematica (Wolfram Research, Inc. 2020).
Funding AgencyGrant Number
Heising-Simons Foundation51 Pegasi b Fellowship
NSF Graduate Research FellowshipUNSPECIFIED
David and Lucile Packard FoundationUNSPECIFIED
Subject Keywords:Planetary system formation; Planet formation; Protoplanetary disks; Pre-main sequence stars; Pre-main sequence; Stellar accretion disks
Issue or Number:1
Classification Code:Unified Astronomy Thesaurus concepts: Planetary system formation (1257); Planet formation (1241); Protoplanetary disks (1300); Pre-main sequence stars (1290); Pre-main sequence (1289); Stellar accretion disks (1579)
Record Number:CaltechAUTHORS:20220523-165139000
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Official Citation:Marguerite Epstein-Martin et al 2022 ApJ 931 42
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:114881
Deposited By: George Porter
Deposited On:24 May 2022 17:16
Last Modified:24 May 2022 17:16

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