Skip to content

Research at St Andrews

Identifying and analysing protostellar disc fragments in smoothed particle hydrodynamics simulations

Research output: Contribution to journalArticle

DOI

Open Access permissions

Open

Author(s)

Cassandra Hall, Duncan Forgan, Ken Rice

School/Research organisations

Abstract

We present a new method of identifying protostellar disc fragments in a simulation based on density derivatives, and analyse our data using this and the existing CLUMPFIND method,which is based on an ordered search over all particles in gravitational potential energy. Using smoothed particle hydrodynamics, we carry out nine simulations of a 0.25 M disc around a1 M star, all of which fragment to form at least two bound objects. We find that when using all particles ordered in gravitational potential space, only fragments that survive the duration of the simulation are detected. When we use the density derivative method, all fragments are detected, so the two methods are complementary, as using the two methods together allows us to identify all fragments, and to then determine those that are likely to be destroyed. We find a tentative empirical relationship between the dominant azimuthal wavenumber in the disc m and the maximum semimajor axis a fragment may achieve in a simulation, such that amax α 1/m. We find the fragment destruction rate to be around half that predicted from population synthesis models. This is due to fragment-fragment interactions in the early gas phase of the disc, which can cause scattering and eccentricity pumping on short time-scales, and affects the fragment's internal structure. We therefore caution that measurements of eccentricity as a function of semimajor axis may not necessarily constrain the formation mechanism of giant planets and brown dwarfs.

Close

Details

Original languageEnglish
Pages (from-to)2517-2538
Number of pages22
JournalMonthly Notices of the Royal Astronomical Society
Volume470
Issue number3
Early online date20 May 2017
DOIs
StatePublished - 21 Sep 2017

    Research areas

  • Brown dwarfs, Disc interactions, Hydrodynamics, Planet, Planetary systems, Planets and satellites: dynamical evolution and stability, Protoplanetary discs

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. Photogravimagnetic assists of light sails: a mixed blessing for Breakthrough Starshot?

    Forgan, D. H., Heller, R. & Hippke, M. 2 Nov 2017 In : Monthly Notices of the Royal Astronomical Society. 474, 3, p. 3212-3220 9 p.

    Research output: Contribution to journalArticle

  2. Can planet formation resolve the dust budget crisis in high-redshift galaxies?

    Forgan, D. H., Rowlands, K., Gomez, H. L., Gomez, E. L., Schofield, S. P., Dunne, L. & Maddox, S. Dec 2017 In : Monthly Notices of the Royal Astronomical Society. 472, 2, p. 2289-2296 8 p.

    Research output: Contribution to journalArticle

  3. The chemistry of protoplanetary fragments formed via gravitational instabilities

    Ilee, J. D., Forgan, D. H., Evans, M. G., Hall, C., Booth, R., Clarke, C. J., Rice, W. K. M., Boley, A. C., Caselli, P., Hartquist, T. W. & Rawlings, J. M. C. Nov 2017 In : Monthly Notices of the Royal Astronomical Society. 472, 1, p. 189-204 16 p.

    Research output: Contribution to journalArticle

  4. On the feasibility of exomoon detection via exoplanet phase curve spectral contrast

    Forgan, D. H. Aug 2017 In : Monthly Notices of the Royal Astronomical Society. 470, 1, p. 416-426 11 p., stx1217

    Research output: Contribution to journalArticle

Related by journal

  1. SDSS-IV MaNGA: the different quenching histories of fast and slow rotators

    Smethurst, R. J., Masters, K. L., Lintott, C. J., Weijmans, A., Merrifield, M., Penny, S. J., Aragón-Salamanca, A., Brownstein, J., Bundy, K., Drory, N., Law, D. R. & Nichol, R. C. 11 Jan 2018 In : Monthly Notices of the Royal Astronomical Society. 473, 2, p. 2679-2687

    Research output: Contribution to journalArticle

  2. The Need for Speed: Escape velocity and dynamical mass measurements of the Andromeda galaxy

    Kafle, P. R., Sharma, S., Lewis, G. F., Robotham, A. S. G. & Driver, S. P. 10 Jan 2018 In : Monthly Notices of the Royal Astronomical Society.

    Research output: Contribution to journalArticle

  3. A plane of high-velocity galaxies across the Local Group

    Banik, I. & Zhao, H. Jan 2018 In : Monthly Notices of the Royal Astronomical Society. 473, 3, p. 4033-4054 22 p.

    Research output: Contribution to journalArticle

  4. The escape velocity curve of the Milky Way in Modified Newtonian dynamics

    Banik, I. & Zhao, H. Jan 2018 In : Monthly Notices of the Royal Astronomical Society. 473, 1, p. 419-430 12 p.

    Research output: Contribution to journalArticle

  5. Formation of stellar clusters

    Smilgys, R. & Bonnell, I. A. 21 Dec 2017 In : Monthly Notices of the Royal Astronomical Society. 472, 4, p. 4982-4991

    Research output: Contribution to journalArticle

Related by journal

  1. Monthly Notices of the Royal Astronomical Society (Journal)

    Carolin Villforth (Reviewer)
    2011 → …

    Activity: Publication peer-review and editorial workPeer review of manuscripts

  2. Monthly Notices of the Royal Astronomical Society (Journal)

    Helling, C. (Editor)
    2007 → …

    Activity: Publication peer-review and editorial workEditor of research journal

  3. Monthly Notices of the Royal Astronomical Society (Journal)

    Cameron, A. C. (Editor)
    2005 → …

    Activity: Publication peer-review and editorial workEditor of research journal

  4. Monthly Notices of the Royal Astronomical Society (Journal)

    Mackay, D. H. (Editor)
    2003 → …

    Activity: Publication peer-review and editorial workEditor of research journal

ID: 250565544