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Claire L. Davies Phd Thesis

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REVOLUTION EVOLUTION: TRACING ANGULAR MOMENTUM DURING STAR AND PLANETARY SYSTEM FORMATION Claire Louise Davies A Thesis Submitted for the Degree of PhD at the University of St Andrews 2015 Full metadata for this item is available in Research@StAndrews:FullText at: http://research-repository.st-andrews.ac.uk/ Please use this identifier to cite or link to this item: http://hdl.handle.net/10023/7557 This item is protected by original copyright This item is licensed under a Creative Commons Licence Revolution Evolution Tracing Angular Momentum During Star And Planetary System Formation by Claire Louise Davies This thesis is submitted in partial fulfilment for the degree of Doctor of Philosophy in Astrophysics at the University of St Andrews April 2015 Declaration I, Claire Louise Davies, hereby certify that this thesis, which is approximately 60,000 words in length, has been written by me, that it is the record of work carried out by me and that it has not been submitted in any previous application for a higher degree. Date Signature of candidate I was admitted as a research student in September 2011 and as a candidate for the degree of PhD in September 2011; the higher study for which this is a record was carried out in the University of St Andrews between 2011 and 2015. Date Signature of candidate I hereby certify that the candidate has fulfilled the conditions of the Resolution and Regulations appropriate for the degree of PhD in the University of St Andrews and that the candidate is qualified to submit this thesis in application for that degree. Date Signature of supervisor i Copyright Agreement In submitting this thesis to the University of St Andrews we understand that we are giving permission for it to be made available for use in accordance with the regulations of the University Library for the time being in force, subject to any copyright vested in the work not being affected thereby. We also understand that the title and the abstract will be published, and that a copy of the work may be made and supplied to any bona fide library or research worker, that my thesis will be electronically accessible for personal or research use unless exempt by award of an embargo as requested below, and that the library has the right to migrate my thesis into new electronic forms as required to ensure continued access to the thesis. We have obtained any third-party copyright permissions that may be required in order to allow such access and migration, or have requested the appropriate embargo below. The following is an agreed request by candidate and supervisor regarding the elec- tronic publication of this thesis: Access to Printed copy and electronic publication of thesis through the University of St Andrews. Date Signature of candidate Date Signature of supervisor iii Collaboration Statement This thesis is the result of my own work carried out at the University of St Andrews between September 2011 and April 2015. Part of the work presented in this thesis has been published in refereed scientific journals. In all cases, the text in the chapters has been written entirely by me. All figures, unless explicitly stated in the text, have been produced by me. Chapters 2 and 3 feature work presented in: \Accretion discs as regulators of stellar angular momentum evolution in the ONC and Taurus-Auriga": Davies C. L., Gregory S. G., Greaves J. S., 2014, Monthly Notices of the Royal Astronomical Society, 444, 1157. Figs. 2.2, 3.1, 3.2, 3.4, 3.8 3.11, and 3.12 have been reproduced from this paper. All work in this paper was carried out and written by me, with scientific advice from the co-authors. Chapter 4 is based on \The outer regions of protoplanetary discs: evidence for viscous evolution?": Davies C. L., Gregory S. G., Greaves J. S., Ilee J. D., 2015, Astronomy & Astrophysics, submitted. Figs. 4.1 to 4.7 appear here in the same format as in the submitted manuscript. All work in this paper was carried out and written by me, with scientific advice from the co-authors. The work presented in Chapter 5 is being prepared for submission to the Monthly Notices of the Royal Astronomical Society and has benefited from collaboration with the Submillimetre Common-User Bolometer Array-2 Observations of Nearby Stars (SONS) consortium. The targets were observed by me and other members of the consortium be- tween February 2012 and September 2014. The data reduction was performed by Wayne S. Holland. The spectral energy distribution modelling (including retrieval of the addi- tional data required for this) was performed by Grant M. Kennedy. Grant provided me with the results of this fitting procedure which I used to calculate the disc masses. Bruce Sibthorpe provided me with his disc-fitting code which I used to determine the radii of the targets showing evidence of extended emission. Jane S. Greaves provided scientific advice. Claire Louise Davies April 2015 v Abstract Stars form via the gravitational collapse of molecular clouds during which time the proto- stellar object contracts by over seven orders of magnitude. If all the angular momentum present in the natal cloud was conserved during collapse, stars would approach rotational velocities rapid enough to tear themselves apart within just a few Myr. In contrast to this, observations of pre-main sequence rotation rates are relatively slow (∼ 1 − 15 days) indicating that significant quantities of angular momentum must be removed from the star. I use observations of fully convective pre-main sequence stars in two well-studied, nearby regions of star formation (namely the Orion Nebula Cluster and Taurus-Auriga) to determine the removal rate of stellar angular momentum. I find the accretion disc- hosting stars to be rotating at a slower rate and contain less specific angular momentum than the disc-less stars. I interpret this as indicating a period of accretion disc-regulated angular momentum evolution followed by near-constant rotational evolution following disc dispersal. Furthermore, assuming that the age spread inferred from the Hertzsprung- Russell diagram constructed for the star forming region is real, I find that the removal rate of angular momentum during the accretion-disc hosting phase to be more rapid than that expected from simple disc-locking theory whereby contraction occurs at a fixed rotation period. This indicates a more efficient process of angular momentum removal must operate, most likely in the form of an accretion-driven stellar wind or outflow emanating from the star-disc interaction. The initial circumstellar envelope that surrounds a protostellar object during the ear- liest stages of star formation is rotationally flattened into a disc as the star contracts. An effective viscosity, present within the disc, enables the disc to evolve: mass accretes inwards through the disc and onto the star while momentum migrates outwards, forcing the outer regions of the disc to expand. I used spatially resolved submillimetre detections of the dust and gas components of protoplanetary discs, gathered from the literature, to measure the radial extent of discs around low-mass pre-main sequence stars of ∼ 1−10 Myr and probe their viscous evolution. I find no clear observational evidence for the radial ex- pansion of the dust component. However, I find tentative evidence for the expansion of vii the gas component. This suggests that the evolution of the gas and dust components of protoplanetary discs are likely governed by different astrophysical processes. Observations of jets and outflows emanating from protostars and pre-main sequence stars highlight that it may also be possible to remove angular momentum from the cir- cumstellar material. Using the sample of spatially resolved protoplanetary discs, I find no evidence for angular momentum removal during disc evolution. I also use the spatially resolved debris discs from the Submillimetre Common-User Bolometer Array-2 Obser- vations of Nearby Stars survey to constrain the amount of angular momentum retained within planetary systems. This sample is compared to the protoplanetary disc angular momenta and to the angular momentum contained within pre-stellar cores. I find that significant quantities of angular momentum must be removed during disc formation and disc dispersal. This likely occurs via magnetic braking during the formation of the disc, via the launching of a disc or photo-evaporative wind, and/or via ejection of planetary material following dynamical interactions. For Grandma and Ella Acknowledgements I would first and foremost like to thank my family for their unfaltering support and encouragement. In particular, Mum, Dad, Emily, Grandad, and Sarah: I could not have gotten this far without you. Knowing I have the support of such a loving bunch of people back home has provided me with all the motivation I could possibly need. I'm also grateful that my trip to the IAUS 299 in Victoria, BC enabled me to rekindle old ties with my Canadian family. Immense thanks go to Bev and Darrell (and Molly-Moo, of course) who essentially adopted me while I was out there - I cannot believe how welcome you made me feel. That trip has definitely been the highlight of the past three and a half years. From an academic point of view, a number of key people deserve particular recognition. My thanks go to my initial supervisor, Jane Greaves and her ability to \accidentally" hire Ford Mustangs on observing trips; to Stuart Littlefair for highlighting the importance of the stellar side of this thesis early on during my PhD; to the support staff and telescope operators at the JCMT; and to members of the star formation and disc communities for their helpful comments and discussions along the way. I'm also indebted to the STFC who provided the funding for my PhD and the ∼ 74; 000 miles I've had the opportunity to travel within that time.
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