If it has oceans, imagine the tides it must get with a 15 earth mass planet between it and it's sun. With this planet only having a 13 day year there would be hardly spittin' distance between it and the 15 masser.
It would be a stange planet though. That close to it's paretn star it is most probably tidally locked like our moon. Although the other large inner planet may throw that out of whack now and then
If there is life there it may only be able to survive near the twilight zones.