Chapter 15

Demographics of Young Stars and Their Protoplanetary Disks: Lessons Learned on Disk Evolution and Its Connection to Planet Formation

Carlo F. Manara, Megan Ansdell, Giovanni P. Rosotti, A. Meredith Hughes, Philip Armitage, Giuseppe Lodato, Jonathan P. Williams

Abstract:

Since Protostars and Planets VI (PPVI), our knowledge of the global properties of proto- planetary and debris disks, as well as of young stars, has dramatically improved. At the time of PPVI, mm-observations and optical to near-infrared spectroscopic surveys were largely limited to the Taurus star-forming region, especially of its most massive disk and stellar population. Now, near-complete surveys of multiple star-forming regions cover both spectroscopy of young stars and mm interferometry of their protoplanetary disks. This provides an unprecedented statistical sample of stellar masses and mass accretion rates, as well as disk masses and radii, for almost 1000 young stellar objects within 300 pc from us, while also sampling different evolutionary stages, ages, and environments. At the same time, surveys of debris disks are revealing the bulk properties of this class of more evolved objects. This chapter reviews the statistics of these measured global star and disk properties and discusses their constraints on theoretical models describing global disk evolution. Our comparisons of observations to theoretical model predictions extends beyond the traditional viscous evolution framework to include analytical descriptions of magnetic wind effects. Finally, we discuss how recent observational results can provide a framework for models of planet population synthesis and planet formation.

Supplementary Data:

Data table:

This table is produced as described in Sect. 2.5 of the Chapter. The table can be downloaded in .tsv format from the button "Data table".
The three main quantities used in the Chapter are listed in the columns ending with '*_PPVII', namely 'Mdust_Mearth_PPVII', 'Mstar_PPVII', 'logMacc_PPVII'. Upper limits on disk dust masses have a '<' at the beginning of the number, upper limits on Macc have a '<' in the 'notes_Macc_PPVII' column. 'SL' stands for 'sub-luminous' (see e.g., Alcala+14). -99 or '--' are used for missing information. For 'logMacc', values below -100 are to be considered as missing information.
The code to reproduce the table will be shared on GitHub (PPVII Table Github).
For any comment on the table, please contact Carlo F. Manara and/or Megan Ansdell.