Importance of radiative effects in gap opening by planets in protoplanetary disks
Abstract
Recent ALMA observations revealed concentric annular structures in several young classII objects. In an attempt to produce the rings and gaps in some of these systems, they have been modeled numerically with a single embedded planet assuming a locally isothermal equation of state. This is often justified by observations targeting the irradiationdominated outer regions of disks (approximately 100 au). We test this assumption by conducting hydrodynamics simulations of embedded planets in thin locally isothermal and radiative disks that mimic the systems HD 163296 and AS 209 in order to examine the effect of including the energy equation in a seemingly locally isothermal environment as far as planetdisk interaction is concerned. We find that modeling such disks with an ideal equation of state makes a difference in terms of the number of produced rings and the spiral arm contrast in the disk. Locally isothermal disks produce sharper annular or azimuthal features and overestimate a single planet's gapopening capabilities by producing multiple gaps. In contrast, planets in radiative disks carve a single gap for typical disk parameters. Consequently, for accurate modeling of planets with semimajor axes up to about 100 au, radiative effects should be taken into account even in seemingly locally isothermal disks. In addition, for the case of AS 209, we find that the primary gap is significantly different between locally isothermal and radiative models. Our results suggest that multiple planets are required to explain the ringrich structures in such systems.
 Publication:

Astronomy and Astrophysics
 Pub Date:
 May 2020
 DOI:
 10.1051/00046361/201937048
 arXiv:
 arXiv:2003.02298
 Bibcode:
 2020A&A...637A..50Z
 Keywords:

 protoplanetary disks;
 planetdisk interactions;
 methods: numerical;
 Astrophysics  Earth and Planetary Astrophysics
 EPrint:
 10 pages, 12 figures, 2 tables