Single planet formation regime in the high-ionization environment: Possible origin of hot Jupiters and super-Earths
We studied the particle growth in a protoplanetary disk in a high-ionization environment and found that icy planet formation is inactive for a disk with an ionization rate 100 times higher than that of the present Solar System. In particular, in the case of M˙<10−7.4M⊙yr−1, only rocky planet form...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2018-07-01
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| Series: | Geoscience Frontiers |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674987116301591 |
| _version_ | 1797766344524955648 |
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| author | Yusuke Imaeda Toshikazu Ebisuzaki |
| author_facet | Yusuke Imaeda Toshikazu Ebisuzaki |
| author_sort | Yusuke Imaeda |
| collection | DOAJ |
| description | We studied the particle growth in a protoplanetary disk in a high-ionization environment and found that icy planet formation is inactive for a disk with an ionization rate 100 times higher than that of the present Solar System. In particular, in the case of M˙<10−7.4M⊙yr−1, only rocky planet formation occurs. In such a case, all the solid materials in the disk drift inward, eventually reach the inner MRI front, and accumulate there. They form a dense, thin sub-disk of solid particles, which undergoes gravitational instability to form rocky planetesimals. The planetesimals rapidly grow into a planet through pebble accretion. Consequently, rocky planets tend to be much larger than planets formed through other regimes (tandem planet formation regime and dispersed planet formation regime), in which icy planet formation actively takes place. These rocky planets may evolve into hot Jupiters if they grow fast enough to the critical core mass of the runaway gas accretion before the dispersal of the disk gas, or they may evolve into super-Earths if the gas dispersed sufficiently early. Keywords: Accretion disk, Planet formation, Magneto-rotational instability, Galactic cosmic rays, Hot Jupiter, Super-Earth |
| first_indexed | 2024-03-12T20:23:55Z |
| format | Article |
| id | doaj.art-ef68a7f8bc3d453aabc514ce2e1d3b53 |
| institution | Directory Open Access Journal |
| issn | 1674-9871 |
| language | English |
| last_indexed | 2024-03-12T20:23:55Z |
| publishDate | 2018-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Geoscience Frontiers |
| spelling | doaj.art-ef68a7f8bc3d453aabc514ce2e1d3b532023-08-02T00:44:49ZengElsevierGeoscience Frontiers1674-98712018-07-019410231031Single planet formation regime in the high-ionization environment: Possible origin of hot Jupiters and super-EarthsYusuke Imaeda0Toshikazu Ebisuzaki1Corresponding author.; RIKEN, 2-1, Hirosawa, 351-0198, JapanRIKEN, 2-1, Hirosawa, 351-0198, JapanWe studied the particle growth in a protoplanetary disk in a high-ionization environment and found that icy planet formation is inactive for a disk with an ionization rate 100 times higher than that of the present Solar System. In particular, in the case of M˙<10−7.4M⊙yr−1, only rocky planet formation occurs. In such a case, all the solid materials in the disk drift inward, eventually reach the inner MRI front, and accumulate there. They form a dense, thin sub-disk of solid particles, which undergoes gravitational instability to form rocky planetesimals. The planetesimals rapidly grow into a planet through pebble accretion. Consequently, rocky planets tend to be much larger than planets formed through other regimes (tandem planet formation regime and dispersed planet formation regime), in which icy planet formation actively takes place. These rocky planets may evolve into hot Jupiters if they grow fast enough to the critical core mass of the runaway gas accretion before the dispersal of the disk gas, or they may evolve into super-Earths if the gas dispersed sufficiently early. Keywords: Accretion disk, Planet formation, Magneto-rotational instability, Galactic cosmic rays, Hot Jupiter, Super-Earthhttp://www.sciencedirect.com/science/article/pii/S1674987116301591 |
| spellingShingle | Yusuke Imaeda Toshikazu Ebisuzaki Single planet formation regime in the high-ionization environment: Possible origin of hot Jupiters and super-Earths Geoscience Frontiers |
| title | Single planet formation regime in the high-ionization environment: Possible origin of hot Jupiters and super-Earths |
| title_full | Single planet formation regime in the high-ionization environment: Possible origin of hot Jupiters and super-Earths |
| title_fullStr | Single planet formation regime in the high-ionization environment: Possible origin of hot Jupiters and super-Earths |
| title_full_unstemmed | Single planet formation regime in the high-ionization environment: Possible origin of hot Jupiters and super-Earths |
| title_short | Single planet formation regime in the high-ionization environment: Possible origin of hot Jupiters and super-Earths |
| title_sort | single planet formation regime in the high ionization environment possible origin of hot jupiters and super earths |
| url | http://www.sciencedirect.com/science/article/pii/S1674987116301591 |
| work_keys_str_mv | AT yusukeimaeda singleplanetformationregimeinthehighionizationenvironmentpossibleoriginofhotjupitersandsuperearths AT toshikazuebisuzaki singleplanetformationregimeinthehighionizationenvironmentpossibleoriginofhotjupitersandsuperearths |