According to reports, Ariel surrendered to police June 22 over two homemade sex videos of himself with two models and TV personalities — Luna Maya and Cut Tari — who allegedly appear in the videos.
The other suspects were not named, nor were Maya and Tari.
Ariel, a singer with local pop band Peterpan, has already been charged with breaches of the Indonesian anti-pornography law and remains in police custody awaiting trial.
Chief detective Ito Sumardi said the eight suspects had uploaded the two explicit videos to the Internet that created a national scandal.
"They'll be charged under the electronic information and transactions law for an illegal distribution," Sumardi said.
Each suspect could face up to six years in jail and a fine of a $100,000.
"The investigation is ongoing. There may have been others," Sumardi added.